a0de36e43672c46c992dfc81a25ea7efad740d7f
[rrdtool.git] / src / rrd_graph.c
1 /****************************************************************************
2  * RRDtool 1.3.2  Copyright by Tobi Oetiker, 1997-2008
3  ****************************************************************************
4  * rrd__graph.c  produce graphs from data in rrdfiles
5  ****************************************************************************/
6
7
8 #include <sys/stat.h>
9 #include <libgen.h>
10
11 #ifdef WIN32
12 #include "strftime.h"
13 #include "plbasename.h"
14 #endif
15
16 #include "rrd_tool.h"
17
18 #if defined(WIN32) && !defined(__CYGWIN__) && !defined(__CYGWIN32__)
19 #include <io.h>
20 #include <fcntl.h>
21 #endif
22
23 #ifdef HAVE_TIME_H
24 #include <time.h>
25 #endif
26
27 #ifdef HAVE_LOCALE_H
28 #include <locale.h>
29 #endif
30
31 #include "rrd_graph.h"
32 #include "rrd_client.h"
33
34 /* some constant definitions */
35
36
37
38 #ifndef RRD_DEFAULT_FONT
39 /* there is special code later to pick Cour.ttf when running on windows */
40 #define RRD_DEFAULT_FONT "DejaVu Sans Mono,Bitstream Vera Sans Mono,monospace,Courier"
41 #endif
42
43 text_prop_t text_prop[] = {
44     {8.0, RRD_DEFAULT_FONT,NULL}
45     ,                   /* default */
46     {9.0, RRD_DEFAULT_FONT,NULL}
47     ,                   /* title */
48     {7.0, RRD_DEFAULT_FONT,NULL}
49     ,                   /* axis */
50     {8.0, RRD_DEFAULT_FONT,NULL}
51     ,                   /* unit */
52     {8.0, RRD_DEFAULT_FONT,NULL} /* legend */
53     ,
54     {5.5, RRD_DEFAULT_FONT,NULL} /* watermark */    
55 };
56
57 xlab_t    xlab[] = {
58     {0, 0, TMT_SECOND, 30, TMT_MINUTE, 5, TMT_MINUTE, 5, 0, "%H:%M"}
59     ,
60     {2, 0, TMT_MINUTE, 1, TMT_MINUTE, 5, TMT_MINUTE, 5, 0, "%H:%M"}
61     ,
62     {5, 0, TMT_MINUTE, 2, TMT_MINUTE, 10, TMT_MINUTE, 10, 0, "%H:%M"}
63     ,
64     {10, 0, TMT_MINUTE, 5, TMT_MINUTE, 20, TMT_MINUTE, 20, 0, "%H:%M"}
65     ,
66     {30, 0, TMT_MINUTE, 10, TMT_HOUR, 1, TMT_HOUR, 1, 0, "%H:%M"}
67     ,
68     {60, 0, TMT_MINUTE, 30, TMT_HOUR, 2, TMT_HOUR, 2, 0, "%H:%M"}
69     ,
70     {60, 24 * 3600, TMT_MINUTE, 30, TMT_HOUR, 2, TMT_HOUR, 6, 0, "%a %H:%M"}
71     ,
72     {180, 0, TMT_HOUR, 1, TMT_HOUR, 6, TMT_HOUR, 6, 0, "%H:%M"}
73     ,
74     {180, 24 * 3600, TMT_HOUR, 1, TMT_HOUR, 6, TMT_HOUR, 12, 0, "%a %H:%M"}
75     ,
76     /*{300,             0,   TMT_HOUR,3,    TMT_HOUR,12,   TMT_HOUR,12,    12*3600,"%a %p"},  this looks silly */
77     {600, 0, TMT_HOUR, 6, TMT_DAY, 1, TMT_DAY, 1, 24 * 3600, "%a"}
78     ,
79     {1200, 0, TMT_HOUR, 6, TMT_DAY, 1, TMT_DAY, 1, 24 * 3600, "%d"}
80     ,
81     {1800, 0, TMT_HOUR, 12, TMT_DAY, 1, TMT_DAY, 2, 24 * 3600, "%a %d"}
82     ,
83     {2400, 0, TMT_HOUR, 12, TMT_DAY, 1, TMT_DAY, 2, 24 * 3600, "%a"}
84     ,
85     {3600, 0, TMT_DAY, 1, TMT_WEEK, 1, TMT_WEEK, 1, 7 * 24 * 3600, "Week %V"}
86     ,
87     {3 * 3600, 0, TMT_WEEK, 1, TMT_MONTH, 1, TMT_WEEK, 2, 7 * 24 * 3600,
88      "Week %V"}
89     ,
90     {6 * 3600, 0, TMT_MONTH, 1, TMT_MONTH, 1, TMT_MONTH, 1, 30 * 24 * 3600,
91      "%b"}
92     ,
93     {48 * 3600, 0, TMT_MONTH, 1, TMT_MONTH, 3, TMT_MONTH, 3, 30 * 24 * 3600,
94      "%b"}
95     ,
96     {315360, 0, TMT_MONTH, 3, TMT_YEAR, 1, TMT_YEAR, 1, 365 * 24 * 3600, "%Y"}
97     ,
98     {10 * 24 * 3600, 0, TMT_YEAR, 1, TMT_YEAR, 1, TMT_YEAR, 1,
99      365 * 24 * 3600, "%y"}
100     ,
101     {-1, 0, TMT_MONTH, 0, TMT_MONTH, 0, TMT_MONTH, 0, 0, ""}
102 };
103
104 /* sensible y label intervals ...*/
105
106 ylab_t    ylab[] = {
107     {0.1, {1, 2, 5, 10}
108      }
109     ,
110     {0.2, {1, 5, 10, 20}
111      }
112     ,
113     {0.5, {1, 2, 4, 10}
114      }
115     ,
116     {1.0, {1, 2, 5, 10}
117      }
118     ,
119     {2.0, {1, 5, 10, 20}
120      }
121     ,
122     {5.0, {1, 2, 4, 10}
123      }
124     ,
125     {10.0, {1, 2, 5, 10}
126      }
127     ,
128     {20.0, {1, 5, 10, 20}
129      }
130     ,
131     {50.0, {1, 2, 4, 10}
132      }
133     ,
134     {100.0, {1, 2, 5, 10}
135      }
136     ,
137     {200.0, {1, 5, 10, 20}
138      }
139     ,
140     {500.0, {1, 2, 4, 10}
141      }
142     ,
143     {0.0, {0, 0, 0, 0}
144      }
145 };
146
147
148 gfx_color_t graph_col[] =   /* default colors */
149 {
150     {1.00, 1.00, 1.00, 1.00},   /* canvas     */
151     {0.95, 0.95, 0.95, 1.00},   /* background */
152     {0.81, 0.81, 0.81, 1.00},   /* shade A    */
153     {0.62, 0.62, 0.62, 1.00},   /* shade B    */
154     {0.56, 0.56, 0.56, 0.75},   /* grid       */
155     {0.87, 0.31, 0.31, 0.60},   /* major grid */
156     {0.00, 0.00, 0.00, 1.00},   /* font       */
157     {0.50, 0.12, 0.12, 1.00},   /* arrow      */
158     {0.12, 0.12, 0.12, 1.00},   /* axis       */
159     {0.00, 0.00, 0.00, 1.00}    /* frame      */
160 };
161
162
163 /* #define DEBUG */
164
165 #ifdef DEBUG
166 # define DPRINT(x)    (void)(printf x, printf("\n"))
167 #else
168 # define DPRINT(x)
169 #endif
170
171
172 /* initialize with xtr(im,0); */
173 int xtr(
174     image_desc_t *im,
175     time_t mytime)
176 {
177     static double pixie;
178
179     if (mytime == 0) {
180         pixie = (double) im->xsize / (double) (im->end - im->start);
181         return im->xorigin;
182     }
183     return (int) ((double) im->xorigin + pixie * (mytime - im->start));
184 }
185
186 /* translate data values into y coordinates */
187 double ytr(
188     image_desc_t *im,
189     double value)
190 {
191     static double pixie;
192     double    yval;
193
194     if (isnan(value)) {
195         if (!im->logarithmic)
196             pixie = (double) im->ysize / (im->maxval - im->minval);
197         else
198             pixie =
199                 (double) im->ysize / (log10(im->maxval) - log10(im->minval));
200         yval = im->yorigin;
201     } else if (!im->logarithmic) {
202         yval = im->yorigin - pixie * (value - im->minval);
203     } else {
204         if (value < im->minval) {
205             yval = im->yorigin;
206         } else {
207             yval = im->yorigin - pixie * (log10(value) - log10(im->minval));
208         }
209     }
210     return yval;
211 }
212
213
214
215 /* conversion function for symbolic entry names */
216
217
218 #define conv_if(VV,VVV) \
219    if (strcmp(#VV, string) == 0) return VVV ;
220
221 enum gf_en gf_conv(
222     char *string)
223 {
224
225     conv_if(PRINT, GF_PRINT);
226     conv_if(GPRINT, GF_GPRINT);
227     conv_if(COMMENT, GF_COMMENT);
228     conv_if(HRULE, GF_HRULE);
229     conv_if(VRULE, GF_VRULE);
230     conv_if(LINE, GF_LINE);
231     conv_if(AREA, GF_AREA);
232     conv_if(STACK, GF_STACK);
233     conv_if(TICK, GF_TICK);
234     conv_if(TEXTALIGN, GF_TEXTALIGN);
235     conv_if(DEF, GF_DEF);
236     conv_if(CDEF, GF_CDEF);
237     conv_if(VDEF, GF_VDEF);
238     conv_if(XPORT, GF_XPORT);
239     conv_if(SHIFT, GF_SHIFT);
240
241     return (enum gf_en)(-1);
242 }
243
244 enum gfx_if_en if_conv(
245     char *string)
246 {
247
248     conv_if(PNG, IF_PNG);
249     conv_if(SVG, IF_SVG);
250     conv_if(EPS, IF_EPS);
251     conv_if(PDF, IF_PDF);
252
253     return (enum gfx_if_en)(-1);
254 }
255
256 enum tmt_en tmt_conv(
257     char *string)
258 {
259
260     conv_if(SECOND, TMT_SECOND);
261     conv_if(MINUTE, TMT_MINUTE);
262     conv_if(HOUR, TMT_HOUR);
263     conv_if(DAY, TMT_DAY);
264     conv_if(WEEK, TMT_WEEK);
265     conv_if(MONTH, TMT_MONTH);
266     conv_if(YEAR, TMT_YEAR);
267     return (enum tmt_en)(-1);
268 }
269
270 enum grc_en grc_conv(
271     char *string)
272 {
273
274     conv_if(BACK, GRC_BACK);
275     conv_if(CANVAS, GRC_CANVAS);
276     conv_if(SHADEA, GRC_SHADEA);
277     conv_if(SHADEB, GRC_SHADEB);
278     conv_if(GRID, GRC_GRID);
279     conv_if(MGRID, GRC_MGRID);
280     conv_if(FONT, GRC_FONT);
281     conv_if(ARROW, GRC_ARROW);
282     conv_if(AXIS, GRC_AXIS);
283     conv_if(FRAME, GRC_FRAME);
284
285     return (enum grc_en)(-1);
286 }
287
288 enum text_prop_en text_prop_conv(
289     char *string)
290 {
291
292     conv_if(DEFAULT, TEXT_PROP_DEFAULT);
293     conv_if(TITLE, TEXT_PROP_TITLE);
294     conv_if(AXIS, TEXT_PROP_AXIS);
295     conv_if(UNIT, TEXT_PROP_UNIT);
296     conv_if(LEGEND, TEXT_PROP_LEGEND);
297     conv_if(WATERMARK, TEXT_PROP_WATERMARK);
298     return (enum text_prop_en)(-1);
299 }
300
301
302 #undef conv_if
303
304 int im_free(
305     image_desc_t *im)
306 {
307     unsigned long i, ii;
308     cairo_status_t status = (cairo_status_t) 0;
309
310     if (im == NULL)
311         return 0;
312
313     if (im->daemon_addr != NULL)
314       free(im->daemon_addr);
315
316     for (i = 0; i < (unsigned) im->gdes_c; i++) {
317         if (im->gdes[i].data_first) {
318             /* careful here, because a single pointer can occur several times */
319             free(im->gdes[i].data);
320             if (im->gdes[i].ds_namv) {
321                 for (ii = 0; ii < im->gdes[i].ds_cnt; ii++)
322                     free(im->gdes[i].ds_namv[ii]);
323                 free(im->gdes[i].ds_namv);
324             }
325         }
326         /* free allocated memory used for dashed lines */
327         if (im->gdes[i].p_dashes != NULL)
328             free(im->gdes[i].p_dashes);
329
330         free(im->gdes[i].p_data);
331         free(im->gdes[i].rpnp);
332     }
333     free(im->gdes);
334     if (im->font_options)
335         cairo_font_options_destroy(im->font_options);
336
337     if (im->cr) {
338         status = cairo_status(im->cr);
339         cairo_destroy(im->cr);
340     }
341     if (im->rendered_image) {
342         free(im->rendered_image);
343     }
344
345     if (im->layout) {
346         g_object_unref (im->layout);
347     }
348
349     if (im->surface)
350         cairo_surface_destroy(im->surface);
351
352     if (status)
353         fprintf(stderr, "OOPS: Cairo has issues it can't even die: %s\n",
354                 cairo_status_to_string(status));
355         
356     return 0;
357 }
358
359 /* find SI magnitude symbol for the given number*/
360 void auto_scale(
361     image_desc_t *im,   /* image description */
362     double *value,
363     char **symb_ptr,
364     double *magfact)
365 {
366
367     char     *symbol[] = { "a", /* 10e-18 Atto */
368         "f",            /* 10e-15 Femto */
369         "p",            /* 10e-12 Pico */
370         "n",            /* 10e-9  Nano */
371         "u",            /* 10e-6  Micro */
372         "m",            /* 10e-3  Milli */
373         " ",            /* Base */
374         "k",            /* 10e3   Kilo */
375         "M",            /* 10e6   Mega */
376         "G",            /* 10e9   Giga */
377         "T",            /* 10e12  Tera */
378         "P",            /* 10e15  Peta */
379         "E"
380     };                  /* 10e18  Exa */
381
382     int       symbcenter = 6;
383     int       sindex;
384
385     if (*value == 0.0 || isnan(*value)) {
386         sindex = 0;
387         *magfact = 1.0;
388     } else {
389         sindex = floor(log(fabs(*value)) / log((double) im->base));
390         *magfact = pow((double) im->base, (double) sindex);
391         (*value) /= (*magfact);
392     }
393     if (sindex <= symbcenter && sindex >= -symbcenter) {
394         (*symb_ptr) = symbol[sindex + symbcenter];
395     } else {
396         (*symb_ptr) = "?";
397     }
398 }
399
400
401 static char si_symbol[] = {
402     'a',                /* 10e-18 Atto */
403     'f',                /* 10e-15 Femto */
404     'p',                /* 10e-12 Pico */
405     'n',                /* 10e-9  Nano */
406     'u',                /* 10e-6  Micro */
407     'm',                /* 10e-3  Milli */
408     ' ',                /* Base */
409     'k',                /* 10e3   Kilo */
410     'M',                /* 10e6   Mega */
411     'G',                /* 10e9   Giga */
412     'T',                /* 10e12  Tera */
413     'P',                /* 10e15  Peta */
414     'E',                /* 10e18  Exa */
415 };
416 static const int si_symbcenter = 6;
417
418 /* find SI magnitude symbol for the numbers on the y-axis*/
419 void si_unit(
420     image_desc_t *im    /* image description */
421     )
422 {
423
424     double    digits, viewdigits = 0;
425
426     digits =
427         floor(log(max(fabs(im->minval), fabs(im->maxval))) /
428               log((double) im->base));
429
430     if (im->unitsexponent != 9999) {
431         /* unitsexponent = 9, 6, 3, 0, -3, -6, -9, etc */
432         viewdigits = floor((double)(im->unitsexponent / 3));
433     } else {
434         viewdigits = digits;
435     }
436
437     im->magfact = pow((double) im->base, digits);
438
439 #ifdef DEBUG
440     printf("digits %6.3f  im->magfact %6.3f\n", digits, im->magfact);
441 #endif
442
443     im->viewfactor = im->magfact / pow((double) im->base, viewdigits);
444
445     if (((viewdigits + si_symbcenter) < sizeof(si_symbol)) &&
446         ((viewdigits + si_symbcenter) >= 0))
447         im->symbol = si_symbol[(int) viewdigits + si_symbcenter];
448     else
449         im->symbol = '?';
450 }
451
452 /*  move min and max values around to become sensible */
453
454 void expand_range(
455     image_desc_t *im)
456 {
457     double    sensiblevalues[] = { 1000.0, 900.0, 800.0, 750.0, 700.0,
458         600.0, 500.0, 400.0, 300.0, 250.0,
459         200.0, 125.0, 100.0, 90.0, 80.0,
460         75.0, 70.0, 60.0, 50.0, 40.0, 30.0,
461         25.0, 20.0, 10.0, 9.0, 8.0,
462         7.0, 6.0, 5.0, 4.0, 3.5, 3.0,
463         2.5, 2.0, 1.8, 1.5, 1.2, 1.0,
464         0.8, 0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.0, -1
465     };
466
467     double    scaled_min, scaled_max;
468     double    adj;
469     int       i;
470
471
472
473 #ifdef DEBUG
474     printf("Min: %6.2f Max: %6.2f MagFactor: %6.2f\n",
475            im->minval, im->maxval, im->magfact);
476 #endif
477
478     if (isnan(im->ygridstep)) {
479         if (im->extra_flags & ALTAUTOSCALE) {
480             /* measure the amplitude of the function. Make sure that
481                graph boundaries are slightly higher then max/min vals
482                so we can see amplitude on the graph */
483             double    delt, fact;
484
485             delt = im->maxval - im->minval;
486             adj = delt * 0.1;
487             fact = 2.0 * pow(10.0,
488                              floor(log10
489                                    (max(fabs(im->minval), fabs(im->maxval)) /
490                                     im->magfact)) - 2);
491             if (delt < fact) {
492                 adj = (fact - delt) * 0.55;
493 #ifdef DEBUG
494                 printf
495                     ("Min: %6.2f Max: %6.2f delt: %6.2f fact: %6.2f adj: %6.2f\n",
496                      im->minval, im->maxval, delt, fact, adj);
497 #endif
498             }
499             im->minval -= adj;
500             im->maxval += adj;
501         } else if (im->extra_flags & ALTAUTOSCALE_MIN) {
502             /* measure the amplitude of the function. Make sure that
503                graph boundaries are slightly lower than min vals
504                so we can see amplitude on the graph */
505             adj = (im->maxval - im->minval) * 0.1;
506             im->minval -= adj;
507         } else if (im->extra_flags & ALTAUTOSCALE_MAX) {
508             /* measure the amplitude of the function. Make sure that
509                graph boundaries are slightly higher than max vals
510                so we can see amplitude on the graph */
511             adj = (im->maxval - im->minval) * 0.1;
512             im->maxval += adj;
513         } else {
514             scaled_min = im->minval / im->magfact;
515             scaled_max = im->maxval / im->magfact;
516
517             for (i = 1; sensiblevalues[i] > 0; i++) {
518                 if (sensiblevalues[i - 1] >= scaled_min &&
519                     sensiblevalues[i] <= scaled_min)
520                     im->minval = sensiblevalues[i] * (im->magfact);
521
522                 if (-sensiblevalues[i - 1] <= scaled_min &&
523                     -sensiblevalues[i] >= scaled_min)
524                     im->minval = -sensiblevalues[i - 1] * (im->magfact);
525
526                 if (sensiblevalues[i - 1] >= scaled_max &&
527                     sensiblevalues[i] <= scaled_max)
528                     im->maxval = sensiblevalues[i - 1] * (im->magfact);
529
530                 if (-sensiblevalues[i - 1] <= scaled_max &&
531                     -sensiblevalues[i] >= scaled_max)
532                     im->maxval = -sensiblevalues[i] * (im->magfact);
533             }
534         }
535     } else {
536         /* adjust min and max to the grid definition if there is one */
537         im->minval = (double) im->ylabfact * im->ygridstep *
538             floor(im->minval / ((double) im->ylabfact * im->ygridstep));
539         im->maxval = (double) im->ylabfact * im->ygridstep *
540             ceil(im->maxval / ((double) im->ylabfact * im->ygridstep));
541     }
542
543 #ifdef DEBUG
544     fprintf(stderr, "SCALED Min: %6.2f Max: %6.2f Factor: %6.2f\n",
545             im->minval, im->maxval, im->magfact);
546 #endif
547 }
548
549
550 void apply_gridfit(
551     image_desc_t *im)
552 {
553     if (isnan(im->minval) || isnan(im->maxval))
554         return;
555     ytr(im, DNAN);
556     if (im->logarithmic) {
557         double    ya, yb, ypix, ypixfrac;
558         double    log10_range = log10(im->maxval) - log10(im->minval);
559
560         ya = pow((double) 10, floor(log10(im->minval)));
561         while (ya < im->minval)
562             ya *= 10;
563         if (ya > im->maxval)
564             return;     /* don't have y=10^x gridline */
565         yb = ya * 10;
566         if (yb <= im->maxval) {
567             /* we have at least 2 y=10^x gridlines.
568                Make sure distance between them in pixels
569                are an integer by expanding im->maxval */
570             double    y_pixel_delta = ytr(im, ya) - ytr(im, yb);
571             double    factor = y_pixel_delta / floor(y_pixel_delta);
572             double    new_log10_range = factor * log10_range;
573             double    new_ymax_log10 = log10(im->minval) + new_log10_range;
574
575             im->maxval = pow(10, new_ymax_log10);
576             ytr(im, DNAN);  /* reset precalc */
577             log10_range = log10(im->maxval) - log10(im->minval);
578         }
579         /* make sure first y=10^x gridline is located on 
580            integer pixel position by moving scale slightly 
581            downwards (sub-pixel movement) */
582         ypix = ytr(im, ya) + im->ysize; /* add im->ysize so it always is positive */
583         ypixfrac = ypix - floor(ypix);
584         if (ypixfrac > 0 && ypixfrac < 1) {
585             double    yfrac = ypixfrac / im->ysize;
586
587             im->minval = pow(10, log10(im->minval) - yfrac * log10_range);
588             im->maxval = pow(10, log10(im->maxval) - yfrac * log10_range);
589             ytr(im, DNAN);  /* reset precalc */
590         }
591     } else {
592         /* Make sure we have an integer pixel distance between
593            each minor gridline */
594         double    ypos1 = ytr(im, im->minval);
595         double    ypos2 = ytr(im, im->minval + im->ygrid_scale.gridstep);
596         double    y_pixel_delta = ypos1 - ypos2;
597         double    factor = y_pixel_delta / floor(y_pixel_delta);
598         double    new_range = factor * (im->maxval - im->minval);
599         double    gridstep = im->ygrid_scale.gridstep;
600         double    minor_y, minor_y_px, minor_y_px_frac;
601
602         if (im->maxval > 0.0)
603             im->maxval = im->minval + new_range;
604         else
605             im->minval = im->maxval - new_range;
606         ytr(im, DNAN);  /* reset precalc */
607         /* make sure first minor gridline is on integer pixel y coord */
608         minor_y = gridstep * floor(im->minval / gridstep);
609         while (minor_y < im->minval)
610             minor_y += gridstep;
611         minor_y_px = ytr(im, minor_y) + im->ysize;  /* ensure > 0 by adding ysize */
612         minor_y_px_frac = minor_y_px - floor(minor_y_px);
613         if (minor_y_px_frac > 0 && minor_y_px_frac < 1) {
614             double    yfrac = minor_y_px_frac / im->ysize;
615             double    range = im->maxval - im->minval;
616
617             im->minval = im->minval - yfrac * range;
618             im->maxval = im->maxval - yfrac * range;
619             ytr(im, DNAN);  /* reset precalc */
620         }
621         calc_horizontal_grid(im);   /* recalc with changed im->maxval */
622     }
623 }
624
625 /* reduce data reimplementation by Alex */
626
627 void reduce_data(
628     enum cf_en cf,      /* which consolidation function ? */
629     unsigned long cur_step, /* step the data currently is in */
630     time_t *start,      /* start, end and step as requested ... */
631     time_t *end,        /* ... by the application will be   ... */
632     unsigned long *step,    /* ... adjusted to represent reality    */
633     unsigned long *ds_cnt,  /* number of data sources in file */
634     rrd_value_t **data)
635 {                       /* two dimensional array containing the data */
636     int       i, reduce_factor = ceil((double) (*step) / (double) cur_step);
637     unsigned long col, dst_row, row_cnt, start_offset, end_offset, skiprows =
638         0;
639     rrd_value_t *srcptr, *dstptr;
640
641     (*step) = cur_step * reduce_factor; /* set new step size for reduced data */
642     dstptr = *data;
643     srcptr = *data;
644     row_cnt = ((*end) - (*start)) / cur_step;
645
646 #ifdef DEBUG
647 #define DEBUG_REDUCE
648 #endif
649 #ifdef DEBUG_REDUCE
650     printf("Reducing %lu rows with factor %i time %lu to %lu, step %lu\n",
651            row_cnt, reduce_factor, *start, *end, cur_step);
652     for (col = 0; col < row_cnt; col++) {
653         printf("time %10lu: ", *start + (col + 1) * cur_step);
654         for (i = 0; i < *ds_cnt; i++)
655             printf(" %8.2e", srcptr[*ds_cnt * col + i]);
656         printf("\n");
657     }
658 #endif
659
660     /* We have to combine [reduce_factor] rows of the source
661      ** into one row for the destination.  Doing this we also
662      ** need to take care to combine the correct rows.  First
663      ** alter the start and end time so that they are multiples
664      ** of the new step time.  We cannot reduce the amount of
665      ** time so we have to move the end towards the future and
666      ** the start towards the past.
667      */
668     end_offset = (*end) % (*step);
669     start_offset = (*start) % (*step);
670
671     /* If there is a start offset (which cannot be more than
672      ** one destination row), skip the appropriate number of
673      ** source rows and one destination row.  The appropriate
674      ** number is what we do know (start_offset/cur_step) of
675      ** the new interval (*step/cur_step aka reduce_factor).
676      */
677 #ifdef DEBUG_REDUCE
678     printf("start_offset: %lu  end_offset: %lu\n", start_offset, end_offset);
679     printf("row_cnt before:  %lu\n", row_cnt);
680 #endif
681     if (start_offset) {
682         (*start) = (*start) - start_offset;
683         skiprows = reduce_factor - start_offset / cur_step;
684         srcptr += skiprows * *ds_cnt;
685         for (col = 0; col < (*ds_cnt); col++)
686             *dstptr++ = DNAN;
687         row_cnt -= skiprows;
688     }
689 #ifdef DEBUG_REDUCE
690     printf("row_cnt between: %lu\n", row_cnt);
691 #endif
692
693     /* At the end we have some rows that are not going to be
694      ** used, the amount is end_offset/cur_step
695      */
696     if (end_offset) {
697         (*end) = (*end) - end_offset + (*step);
698         skiprows = end_offset / cur_step;
699         row_cnt -= skiprows;
700     }
701 #ifdef DEBUG_REDUCE
702     printf("row_cnt after:   %lu\n", row_cnt);
703 #endif
704
705 /* Sanity check: row_cnt should be multiple of reduce_factor */
706 /* if this gets triggered, something is REALLY WRONG ... we die immediately */
707
708     if (row_cnt % reduce_factor) {
709         printf("SANITY CHECK: %lu rows cannot be reduced by %i \n",
710                row_cnt, reduce_factor);
711         printf("BUG in reduce_data()\n");
712         exit(1);
713     }
714
715     /* Now combine reduce_factor intervals at a time
716      ** into one interval for the destination.
717      */
718
719     for (dst_row = 0; (long int) row_cnt >= reduce_factor; dst_row++) {
720         for (col = 0; col < (*ds_cnt); col++) {
721             rrd_value_t newval = DNAN;
722             unsigned long validval = 0;
723
724             for (i = 0; i < reduce_factor; i++) {
725                 if (isnan(srcptr[i * (*ds_cnt) + col])) {
726                     continue;
727                 }
728                 validval++;
729                 if (isnan(newval))
730                     newval = srcptr[i * (*ds_cnt) + col];
731                 else {
732                     switch (cf) {
733                     case CF_HWPREDICT:
734                     case CF_MHWPREDICT:
735                     case CF_DEVSEASONAL:
736                     case CF_DEVPREDICT:
737                     case CF_SEASONAL:
738                     case CF_AVERAGE:
739                         newval += srcptr[i * (*ds_cnt) + col];
740                         break;
741                     case CF_MINIMUM:
742                         newval = min(newval, srcptr[i * (*ds_cnt) + col]);
743                         break;
744                     case CF_FAILURES:
745                         /* an interval contains a failure if any subintervals contained a failure */
746                     case CF_MAXIMUM:
747                         newval = max(newval, srcptr[i * (*ds_cnt) + col]);
748                         break;
749                     case CF_LAST:
750                         newval = srcptr[i * (*ds_cnt) + col];
751                         break;
752                     }
753                 }
754             }
755             if (validval == 0) {
756                 newval = DNAN;
757             } else {
758                 switch (cf) {
759                 case CF_HWPREDICT:
760                 case CF_MHWPREDICT:
761                 case CF_DEVSEASONAL:
762                 case CF_DEVPREDICT:
763                 case CF_SEASONAL:
764                 case CF_AVERAGE:
765                     newval /= validval;
766                     break;
767                 case CF_MINIMUM:
768                 case CF_FAILURES:
769                 case CF_MAXIMUM:
770                 case CF_LAST:
771                     break;
772                 }
773             }
774             *dstptr++ = newval;
775         }
776         srcptr += (*ds_cnt) * reduce_factor;
777         row_cnt -= reduce_factor;
778     }
779     /* If we had to alter the endtime, we didn't have enough
780      ** source rows to fill the last row. Fill it with NaN.
781      */
782     if (end_offset)
783         for (col = 0; col < (*ds_cnt); col++)
784             *dstptr++ = DNAN;
785 #ifdef DEBUG_REDUCE
786     row_cnt = ((*end) - (*start)) / *step;
787     srcptr = *data;
788     printf("Done reducing. Currently %lu rows, time %lu to %lu, step %lu\n",
789            row_cnt, *start, *end, *step);
790     for (col = 0; col < row_cnt; col++) {
791         printf("time %10lu: ", *start + (col + 1) * (*step));
792         for (i = 0; i < *ds_cnt; i++)
793             printf(" %8.2e", srcptr[*ds_cnt * col + i]);
794         printf("\n");
795     }
796 #endif
797 }
798
799
800 /* get the data required for the graphs from the 
801    relevant rrds ... */
802
803 int data_fetch(
804     image_desc_t *im)
805 {
806     int       i, ii;
807     int       skip;
808
809     /* pull the data from the rrd files ... */
810     for (i = 0; i < (int) im->gdes_c; i++) {
811         /* only GF_DEF elements fetch data */
812         if (im->gdes[i].gf != GF_DEF)
813             continue;
814
815         skip = 0;
816         /* do we have it already ? */
817         for (ii = 0; ii < i; ii++) {
818             if (im->gdes[ii].gf != GF_DEF)
819                 continue;
820             if ((strcmp(im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
821                 && (im->gdes[i].cf == im->gdes[ii].cf)
822                 && (im->gdes[i].cf_reduce == im->gdes[ii].cf_reduce)
823                 && (im->gdes[i].start_orig == im->gdes[ii].start_orig)
824                 && (im->gdes[i].end_orig == im->gdes[ii].end_orig)
825                 && (im->gdes[i].step_orig == im->gdes[ii].step_orig)) {
826                 /* OK, the data is already there.
827                  ** Just copy the header portion
828                  */
829                 im->gdes[i].start = im->gdes[ii].start;
830                 im->gdes[i].end = im->gdes[ii].end;
831                 im->gdes[i].step = im->gdes[ii].step;
832                 im->gdes[i].ds_cnt = im->gdes[ii].ds_cnt;
833                 im->gdes[i].ds_namv = im->gdes[ii].ds_namv;
834                 im->gdes[i].data = im->gdes[ii].data;
835                 im->gdes[i].data_first = 0;
836                 skip = 1;
837             }
838             if (skip)
839                 break;
840         }
841         if (!skip) {
842             unsigned long ft_step = im->gdes[i].step;   /* ft_step will record what we got from fetch */
843
844             /* Flush the file if
845              * - a connection to the daemon has been established
846              * - this is the first occurrence of that RRD file
847              */
848             if (rrdc_is_connected(im->daemon_addr))
849             {
850                 int status;
851
852                 status = 0;
853                 for (ii = 0; ii < i; ii++)
854                 {
855                     if (strcmp (im->gdes[i].rrd, im->gdes[ii].rrd) == 0)
856                     {
857                         status = 1;
858                         break;
859                     }
860                 }
861
862                 if (status == 0)
863                 {
864                     status = rrdc_flush (im->gdes[i].rrd);
865                     if (status != 0)
866                     {
867                         rrd_set_error ("rrdc_flush (%s) failed with status %i.",
868                                 im->gdes[i].rrd, status);
869                         return (-1);
870                     }
871                 }
872             } /* if (rrdc_is_connected()) */
873
874             if ((rrd_fetch_fn(im->gdes[i].rrd,
875                               im->gdes[i].cf,
876                               &im->gdes[i].start,
877                               &im->gdes[i].end,
878                               &ft_step,
879                               &im->gdes[i].ds_cnt,
880                               &im->gdes[i].ds_namv,
881                               &im->gdes[i].data)) == -1) {
882                 return -1;
883             }
884             im->gdes[i].data_first = 1;
885
886             if (ft_step < im->gdes[i].step) {
887                 reduce_data(im->gdes[i].cf_reduce,
888                             ft_step,
889                             &im->gdes[i].start,
890                             &im->gdes[i].end,
891                             &im->gdes[i].step,
892                             &im->gdes[i].ds_cnt, &im->gdes[i].data);
893             } else {
894                 im->gdes[i].step = ft_step;
895             }
896         }
897
898         /* lets see if the required data source is really there */
899         for (ii = 0; ii < (int) im->gdes[i].ds_cnt; ii++) {
900             if (strcmp(im->gdes[i].ds_namv[ii], im->gdes[i].ds_nam) == 0) {
901                 im->gdes[i].ds = ii;
902             }
903         }
904         if (im->gdes[i].ds == -1) {
905             rrd_set_error("No DS called '%s' in '%s'",
906                           im->gdes[i].ds_nam, im->gdes[i].rrd);
907             return -1;
908         }
909
910     }
911     return 0;
912 }
913
914 /* evaluate the expressions in the CDEF functions */
915
916 /*************************************************************
917  * CDEF stuff 
918  *************************************************************/
919
920 long find_var_wrapper(
921     void *arg1,
922     char *key)
923 {
924     return find_var((image_desc_t *) arg1, key);
925 }
926
927 /* find gdes containing var*/
928 long find_var(
929     image_desc_t *im,
930     char *key)
931 {
932     long      ii;
933
934     for (ii = 0; ii < im->gdes_c - 1; ii++) {
935         if ((im->gdes[ii].gf == GF_DEF
936              || im->gdes[ii].gf == GF_VDEF || im->gdes[ii].gf == GF_CDEF)
937             && (strcmp(im->gdes[ii].vname, key) == 0)) {
938             return ii;
939         }
940     }
941     return -1;
942 }
943
944 /* find the greatest common divisor for all the numbers
945    in the 0 terminated num array */
946 long lcd(
947     long *num)
948 {
949     long      rest;
950     int       i;
951
952     for (i = 0; num[i + 1] != 0; i++) {
953         do {
954             rest = num[i] % num[i + 1];
955             num[i] = num[i + 1];
956             num[i + 1] = rest;
957         } while (rest != 0);
958         num[i + 1] = num[i];
959     }
960 /*    return i==0?num[i]:num[i-1]; */
961     return num[i];
962 }
963
964 /* run the rpn calculator on all the VDEF and CDEF arguments */
965 int data_calc(
966     image_desc_t *im)
967 {
968
969     int       gdi;
970     int       dataidx;
971     long     *steparray, rpi;
972     int       stepcnt;
973     time_t    now;
974     rpnstack_t rpnstack;
975
976     rpnstack_init(&rpnstack);
977
978     for (gdi = 0; gdi < im->gdes_c; gdi++) {
979         /* Look for GF_VDEF and GF_CDEF in the same loop,
980          * so CDEFs can use VDEFs and vice versa
981          */
982         switch (im->gdes[gdi].gf) {
983         case GF_XPORT:
984             break;
985         case GF_SHIFT:{
986             graph_desc_t *vdp = &im->gdes[im->gdes[gdi].vidx];
987
988             /* remove current shift */
989             vdp->start -= vdp->shift;
990             vdp->end -= vdp->shift;
991
992             /* vdef */
993             if (im->gdes[gdi].shidx >= 0)
994                 vdp->shift = im->gdes[im->gdes[gdi].shidx].vf.val;
995             /* constant */
996             else
997                 vdp->shift = im->gdes[gdi].shval;
998
999             /* normalize shift to multiple of consolidated step */
1000             vdp->shift = (vdp->shift / (long) vdp->step) * (long) vdp->step;
1001
1002             /* apply shift */
1003             vdp->start += vdp->shift;
1004             vdp->end += vdp->shift;
1005             break;
1006         }
1007         case GF_VDEF:
1008             /* A VDEF has no DS.  This also signals other parts
1009              * of rrdtool that this is a VDEF value, not a CDEF.
1010              */
1011             im->gdes[gdi].ds_cnt = 0;
1012             if (vdef_calc(im, gdi)) {
1013                 rrd_set_error("Error processing VDEF '%s'",
1014                               im->gdes[gdi].vname);
1015                 rpnstack_free(&rpnstack);
1016                 return -1;
1017             }
1018             break;
1019         case GF_CDEF:
1020             im->gdes[gdi].ds_cnt = 1;
1021             im->gdes[gdi].ds = 0;
1022             im->gdes[gdi].data_first = 1;
1023             im->gdes[gdi].start = 0;
1024             im->gdes[gdi].end = 0;
1025             steparray = NULL;
1026             stepcnt = 0;
1027             dataidx = -1;
1028
1029             /* Find the variables in the expression.
1030              * - VDEF variables are substituted by their values
1031              *   and the opcode is changed into OP_NUMBER.
1032              * - CDEF variables are analized for their step size,
1033              *   the lowest common denominator of all the step
1034              *   sizes of the data sources involved is calculated
1035              *   and the resulting number is the step size for the
1036              *   resulting data source.
1037              */
1038             for (rpi = 0; im->gdes[gdi].rpnp[rpi].op != OP_END; rpi++) {
1039                 if (im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
1040                     im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER) {
1041                     long      ptr = im->gdes[gdi].rpnp[rpi].ptr;
1042
1043                     if (im->gdes[ptr].ds_cnt == 0) {    /* this is a VDEF data source */
1044 #if 0
1045                         printf
1046                             ("DEBUG: inside CDEF '%s' processing VDEF '%s'\n",
1047                              im->gdes[gdi].vname, im->gdes[ptr].vname);
1048                         printf("DEBUG: value from vdef is %f\n",
1049                                im->gdes[ptr].vf.val);
1050 #endif
1051                         im->gdes[gdi].rpnp[rpi].val = im->gdes[ptr].vf.val;
1052                         im->gdes[gdi].rpnp[rpi].op = OP_NUMBER;
1053                     } else {    /* normal variables and PREF(variables) */
1054
1055                         /* add one entry to the array that keeps track of the step sizes of the
1056                          * data sources going into the CDEF. */
1057                         if ((steparray =
1058                              (long*)rrd_realloc(steparray,
1059                                          (++stepcnt +
1060                                           1) * sizeof(*steparray))) == NULL) {
1061                             rrd_set_error("realloc steparray");
1062                             rpnstack_free(&rpnstack);
1063                             return -1;
1064                         };
1065
1066                         steparray[stepcnt - 1] = im->gdes[ptr].step;
1067
1068                         /* adjust start and end of cdef (gdi) so
1069                          * that it runs from the latest start point
1070                          * to the earliest endpoint of any of the
1071                          * rras involved (ptr)
1072                          */
1073
1074                         if (im->gdes[gdi].start < im->gdes[ptr].start)
1075                             im->gdes[gdi].start = im->gdes[ptr].start;
1076
1077                         if (im->gdes[gdi].end == 0 ||
1078                             im->gdes[gdi].end > im->gdes[ptr].end)
1079                             im->gdes[gdi].end = im->gdes[ptr].end;
1080
1081                         /* store pointer to the first element of
1082                          * the rra providing data for variable,
1083                          * further save step size and data source
1084                          * count of this rra
1085                          */
1086                         im->gdes[gdi].rpnp[rpi].data =
1087                             im->gdes[ptr].data + im->gdes[ptr].ds;
1088                         im->gdes[gdi].rpnp[rpi].step = im->gdes[ptr].step;
1089                         im->gdes[gdi].rpnp[rpi].ds_cnt = im->gdes[ptr].ds_cnt;
1090
1091                         /* backoff the *.data ptr; this is done so
1092                          * rpncalc() function doesn't have to treat
1093                          * the first case differently
1094                          */
1095                     }   /* if ds_cnt != 0 */
1096                 }       /* if OP_VARIABLE */
1097             }           /* loop through all rpi */
1098
1099             /* move the data pointers to the correct period */
1100             for (rpi = 0; im->gdes[gdi].rpnp[rpi].op != OP_END; rpi++) {
1101                 if (im->gdes[gdi].rpnp[rpi].op == OP_VARIABLE ||
1102                     im->gdes[gdi].rpnp[rpi].op == OP_PREV_OTHER) {
1103                     long      ptr = im->gdes[gdi].rpnp[rpi].ptr;
1104                     long      diff =
1105                         im->gdes[gdi].start - im->gdes[ptr].start;
1106
1107                     if (diff > 0)
1108                         im->gdes[gdi].rpnp[rpi].data +=
1109                             (diff / im->gdes[ptr].step) *
1110                             im->gdes[ptr].ds_cnt;
1111                 }
1112             }
1113
1114             if (steparray == NULL) {
1115                 rrd_set_error("rpn expressions without DEF"
1116                               " or CDEF variables are not supported");
1117                 rpnstack_free(&rpnstack);
1118                 return -1;
1119             }
1120             steparray[stepcnt] = 0;
1121             /* Now find the resulting step.  All steps in all
1122              * used RRAs have to be visited
1123              */
1124             im->gdes[gdi].step = lcd(steparray);
1125             free(steparray);
1126             if ((im->gdes[gdi].data = (rrd_value_t*)malloc(((im->gdes[gdi].end -
1127                                                im->gdes[gdi].start)
1128                                               / im->gdes[gdi].step)
1129                                              * sizeof(double))) == NULL) {
1130                 rrd_set_error("malloc im->gdes[gdi].data");
1131                 rpnstack_free(&rpnstack);
1132                 return -1;
1133             }
1134
1135             /* Step through the new cdef results array and
1136              * calculate the values
1137              */
1138             for (now = im->gdes[gdi].start + im->gdes[gdi].step;
1139                  now <= im->gdes[gdi].end; now += im->gdes[gdi].step) {
1140                 rpnp_t   *rpnp = im->gdes[gdi].rpnp;
1141
1142                 /* 3rd arg of rpn_calc is for OP_VARIABLE lookups;
1143                  * in this case we are advancing by timesteps;
1144                  * we use the fact that time_t is a synonym for long
1145                  */
1146                 if (rpn_calc(rpnp, &rpnstack, (long) now,
1147                              im->gdes[gdi].data, ++dataidx) == -1) {
1148                     /* rpn_calc sets the error string */
1149                     rpnstack_free(&rpnstack);
1150                     return -1;
1151                 }
1152             }           /* enumerate over time steps within a CDEF */
1153             break;
1154         default:
1155             continue;
1156         }
1157     }                   /* enumerate over CDEFs */
1158     rpnstack_free(&rpnstack);
1159     return 0;
1160 }
1161
1162 /* from http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm */
1163 /* yes we are loosing precision by doing tos with floats instead of doubles
1164    but it seems more stable this way. */
1165
1166 static int AlmostEqual2sComplement(
1167     float A,
1168     float B,
1169     int maxUlps)
1170 {
1171
1172     int       aInt = *(int *) &A;
1173     int       bInt = *(int *) &B;
1174     int       intDiff;
1175
1176     /* Make sure maxUlps is non-negative and small enough that the
1177        default NAN won't compare as equal to anything.  */
1178
1179     /* assert(maxUlps > 0 && maxUlps < 4 * 1024 * 1024); */
1180
1181     /* Make aInt lexicographically ordered as a twos-complement int */
1182
1183     if (aInt < 0)
1184         aInt = 0x80000000l - aInt;
1185
1186     /* Make bInt lexicographically ordered as a twos-complement int */
1187
1188     if (bInt < 0)
1189         bInt = 0x80000000l - bInt;
1190
1191     intDiff = abs(aInt - bInt);
1192
1193     if (intDiff <= maxUlps)
1194         return 1;
1195
1196     return 0;
1197 }
1198
1199 /* massage data so, that we get one value for each x coordinate in the graph */
1200 int data_proc(
1201     image_desc_t *im)
1202 {
1203     long      i, ii;
1204     double    pixstep = (double) (im->end - im->start)
1205         / (double) im->xsize;   /* how much time 
1206                                    passes in one pixel */
1207     double    paintval;
1208     double    minval = DNAN, maxval = DNAN;
1209
1210     unsigned long gr_time;
1211
1212     /* memory for the processed data */
1213     for (i = 0; i < im->gdes_c; i++) {
1214         if ((im->gdes[i].gf == GF_LINE) ||
1215             (im->gdes[i].gf == GF_AREA) || (im->gdes[i].gf == GF_TICK)) {
1216             if ((im->gdes[i].p_data = (rrd_value_t*)malloc((im->xsize + 1)
1217                                              * sizeof(rrd_value_t))) == NULL) {
1218                 rrd_set_error("malloc data_proc");
1219                 return -1;
1220             }
1221         }
1222     }
1223
1224     for (i = 0; i < im->xsize; i++) {   /* for each pixel */
1225         long      vidx;
1226
1227         gr_time = im->start + pixstep * i;  /* time of the current step */
1228         paintval = 0.0;
1229
1230         for (ii = 0; ii < im->gdes_c; ii++) {
1231             double    value;
1232
1233             switch (im->gdes[ii].gf) {
1234             case GF_LINE:
1235             case GF_AREA:
1236             case GF_TICK:
1237                 if (!im->gdes[ii].stack)
1238                     paintval = 0.0;
1239                 value = im->gdes[ii].yrule;
1240                 if (isnan(value) || (im->gdes[ii].gf == GF_TICK)) {
1241                     /* The time of the data doesn't necessarily match
1242                      ** the time of the graph. Beware.
1243                      */
1244                     vidx = im->gdes[ii].vidx;
1245                     if (im->gdes[vidx].gf == GF_VDEF) {
1246                         value = im->gdes[vidx].vf.val;
1247                     } else
1248                         if (((long int) gr_time >=
1249                              (long int) im->gdes[vidx].start)
1250                             && ((long int) gr_time <=
1251                                 (long int) im->gdes[vidx].end)) {
1252                         value = im->gdes[vidx].data[(unsigned long)
1253                                                     floor((double)
1254                                                           (gr_time -
1255                                                            im->gdes[vidx].
1256                                                            start)
1257                                                           /
1258                                                           im->gdes[vidx].step)
1259                                                     * im->gdes[vidx].ds_cnt +
1260                                                     im->gdes[vidx].ds];
1261                     } else {
1262                         value = DNAN;
1263                     }
1264                 };
1265
1266                 if (!isnan(value)) {
1267                     paintval += value;
1268                     im->gdes[ii].p_data[i] = paintval;
1269                     /* GF_TICK: the data values are not
1270                      ** relevant for min and max
1271                      */
1272                     if (finite(paintval) && im->gdes[ii].gf != GF_TICK) {
1273                         if ((isnan(minval) || paintval < minval) &&
1274                             !(im->logarithmic && paintval <= 0.0))
1275                             minval = paintval;
1276                         if (isnan(maxval) || paintval > maxval)
1277                             maxval = paintval;
1278                     }
1279                 } else {
1280                     im->gdes[ii].p_data[i] = DNAN;
1281                 }
1282                 break;
1283             case GF_STACK:
1284                 rrd_set_error
1285                     ("STACK should already be turned into LINE or AREA here");
1286                 return -1;
1287                 break;
1288             default:
1289                 break;
1290             }
1291         }
1292     }
1293
1294     /* if min or max have not been asigned a value this is because
1295        there was no data in the graph ... this is not good ...
1296        lets set these to dummy values then ... */
1297
1298     if (im->logarithmic) {
1299         if (isnan(minval) || isnan(maxval) || maxval <= 0) {
1300             minval = 0.0;   /* catching this right away below */
1301             maxval = 5.1;
1302         }
1303         /* in logarithm mode, where minval is smaller or equal 
1304            to 0 make the beast just way smaller than maxval */
1305         if (minval <= 0) {
1306             minval = maxval / 10e8;
1307         }
1308     } else {
1309         if (isnan(minval) || isnan(maxval)) {
1310             minval = 0.0;
1311             maxval = 1.0;
1312         }
1313     }
1314
1315     /* adjust min and max values given by the user */
1316     /* for logscale we add something on top */
1317     if (isnan(im->minval)
1318         || ((!im->rigid) && im->minval > minval)
1319         ) {
1320         if (im->logarithmic)
1321             im->minval = minval / 2.0;
1322         else
1323             im->minval = minval;
1324     }
1325     if (isnan(im->maxval)
1326         || (!im->rigid && im->maxval < maxval)
1327         ) {
1328         if (im->logarithmic)
1329             im->maxval = maxval * 2.0;
1330         else
1331             im->maxval = maxval;
1332     }
1333
1334     /* make sure min is smaller than max */
1335     if (im->minval > im->maxval) {
1336         if (im->minval > 0)
1337             im->minval = 0.99 * im->maxval;
1338         else
1339             im->minval = 1.01 * im->maxval;
1340     }
1341
1342     /* make sure min and max are not equal */
1343     if (AlmostEqual2sComplement(im->minval, im->maxval, 4)) {
1344         if (im->maxval > 0)
1345             im->maxval *= 1.01;
1346         else
1347             im->maxval *= 0.99;
1348
1349         /* make sure min and max are not both zero */
1350         if (AlmostEqual2sComplement(im->maxval, 0, 4)) {
1351             im->maxval = 1.0;
1352         }
1353     }
1354     return 0;
1355 }
1356
1357
1358
1359 /* identify the point where the first gridline, label ... gets placed */
1360
1361 time_t find_first_time(
1362     time_t start,       /* what is the initial time */
1363     enum tmt_en baseint,    /* what is the basic interval */
1364     long basestep       /* how many if these do we jump a time */
1365     )
1366 {
1367     struct tm tm;
1368
1369     localtime_r(&start, &tm);
1370
1371     switch (baseint) {
1372     case TMT_SECOND:
1373         tm.       tm_sec -= tm.tm_sec % basestep;
1374
1375         break;
1376     case TMT_MINUTE:
1377         tm.       tm_sec = 0;
1378         tm.       tm_min -= tm.tm_min % basestep;
1379
1380         break;
1381     case TMT_HOUR:
1382         tm.       tm_sec = 0;
1383         tm.       tm_min = 0;
1384         tm.       tm_hour -= tm.tm_hour % basestep;
1385
1386         break;
1387     case TMT_DAY:
1388         /* we do NOT look at the basestep for this ... */
1389         tm.       tm_sec = 0;
1390         tm.       tm_min = 0;
1391         tm.       tm_hour = 0;
1392
1393         break;
1394     case TMT_WEEK:
1395         /* we do NOT look at the basestep for this ... */
1396         tm.       tm_sec = 0;
1397         tm.       tm_min = 0;
1398         tm.       tm_hour = 0;
1399         tm.       tm_mday -= tm.tm_wday - 1;    /* -1 because we want the monday */
1400
1401         if (tm.tm_wday == 0)
1402             tm.       tm_mday -= 7; /* we want the *previous* monday */
1403
1404         break;
1405     case TMT_MONTH:
1406         tm.       tm_sec = 0;
1407         tm.       tm_min = 0;
1408         tm.       tm_hour = 0;
1409         tm.       tm_mday = 1;
1410         tm.       tm_mon -= tm.tm_mon % basestep;
1411
1412         break;
1413
1414     case TMT_YEAR:
1415         tm.       tm_sec = 0;
1416         tm.       tm_min = 0;
1417         tm.       tm_hour = 0;
1418         tm.       tm_mday = 1;
1419         tm.       tm_mon = 0;
1420         tm.       tm_year -= (
1421     tm.tm_year + 1900) %basestep;
1422
1423     }
1424     return mktime(&tm);
1425 }
1426
1427 /* identify the point where the next gridline, label ... gets placed */
1428 time_t find_next_time(
1429     time_t current,     /* what is the initial time */
1430     enum tmt_en baseint,    /* what is the basic interval */
1431     long basestep       /* how many if these do we jump a time */
1432     )
1433 {
1434     struct tm tm;
1435     time_t    madetime;
1436
1437     localtime_r(&current, &tm);
1438
1439     do {
1440         switch (baseint) {
1441         case TMT_SECOND:
1442             tm.       tm_sec += basestep;
1443
1444             break;
1445         case TMT_MINUTE:
1446             tm.       tm_min += basestep;
1447
1448             break;
1449         case TMT_HOUR:
1450             tm.       tm_hour += basestep;
1451
1452             break;
1453         case TMT_DAY:
1454             tm.       tm_mday += basestep;
1455
1456             break;
1457         case TMT_WEEK:
1458             tm.       tm_mday += 7 * basestep;
1459
1460             break;
1461         case TMT_MONTH:
1462             tm.       tm_mon += basestep;
1463
1464             break;
1465         case TMT_YEAR:
1466             tm.       tm_year += basestep;
1467         }
1468         madetime = mktime(&tm);
1469     } while (madetime == -1);   /* this is necessary to skip impssible times
1470                                    like the daylight saving time skips */
1471     return madetime;
1472
1473 }
1474
1475
1476 /* calculate values required for PRINT and GPRINT functions */
1477
1478 int print_calc(
1479     image_desc_t *im)
1480 {
1481     long      i, ii, validsteps;
1482     double    printval;
1483     struct tm tmvdef;
1484     int       graphelement = 0;
1485     long      vidx;
1486     int       max_ii;
1487     double    magfact = -1;
1488     char     *si_symb = "";
1489     char     *percent_s;
1490     int       prline_cnt = 0;
1491
1492     /* wow initializing tmvdef is quite a task :-) */
1493     time_t    now = time(NULL);
1494
1495     localtime_r(&now, &tmvdef);
1496     for (i = 0; i < im->gdes_c; i++) {
1497         vidx = im->gdes[i].vidx;
1498         switch (im->gdes[i].gf) {
1499         case GF_PRINT:
1500         case GF_GPRINT:
1501             /* PRINT and GPRINT can now print VDEF generated values.
1502              * There's no need to do any calculations on them as these
1503              * calculations were already made.
1504              */
1505             if (im->gdes[vidx].gf == GF_VDEF) { /* simply use vals */
1506                 printval = im->gdes[vidx].vf.val;
1507                 localtime_r(&im->gdes[vidx].vf.when, &tmvdef);
1508             } else {    /* need to calculate max,min,avg etcetera */
1509                 max_ii = ((im->gdes[vidx].end - im->gdes[vidx].start)
1510                           / im->gdes[vidx].step * im->gdes[vidx].ds_cnt);
1511                 printval = DNAN;
1512                 validsteps = 0;
1513                 for (ii = im->gdes[vidx].ds;
1514                      ii < max_ii; ii += im->gdes[vidx].ds_cnt) {
1515                     if (!finite(im->gdes[vidx].data[ii]))
1516                         continue;
1517                     if (isnan(printval)) {
1518                         printval = im->gdes[vidx].data[ii];
1519                         validsteps++;
1520                         continue;
1521                     }
1522
1523                     switch (im->gdes[i].cf) {
1524                     case CF_HWPREDICT:
1525                     case CF_MHWPREDICT:
1526                     case CF_DEVPREDICT:
1527                     case CF_DEVSEASONAL:
1528                     case CF_SEASONAL:
1529                     case CF_AVERAGE:
1530                         validsteps++;
1531                         printval += im->gdes[vidx].data[ii];
1532                         break;
1533                     case CF_MINIMUM:
1534                         printval = min(printval, im->gdes[vidx].data[ii]);
1535                         break;
1536                     case CF_FAILURES:
1537                     case CF_MAXIMUM:
1538                         printval = max(printval, im->gdes[vidx].data[ii]);
1539                         break;
1540                     case CF_LAST:
1541                         printval = im->gdes[vidx].data[ii];
1542                     }
1543                 }
1544                 if (im->gdes[i].cf == CF_AVERAGE || im->gdes[i].cf > CF_LAST) {
1545                     if (validsteps > 1) {
1546                         printval = (printval / validsteps);
1547                     }
1548                 }
1549             }           /* prepare printval */
1550
1551             if ((percent_s = strstr(im->gdes[i].format, "%S")) != NULL) {
1552                 /* Magfact is set to -1 upon entry to print_calc.  If it
1553                  * is still less than 0, then we need to run auto_scale.
1554                  * Otherwise, put the value into the correct units.  If
1555                  * the value is 0, then do not set the symbol or magnification
1556                  * so next the calculation will be performed again. */
1557                 if (magfact < 0.0) {
1558                     auto_scale(im, &printval, &si_symb, &magfact);
1559                     if (printval == 0.0)
1560                         magfact = -1.0;
1561                 } else {
1562                     printval /= magfact;
1563                 }
1564                 *(++percent_s) = 's';
1565             } else if (strstr(im->gdes[i].format, "%s") != NULL) {
1566                 auto_scale(im, &printval, &si_symb, &magfact);
1567             }
1568
1569             if (im->gdes[i].gf == GF_PRINT) {
1570                 rrd_infoval_t prline;
1571
1572                 if (im->gdes[i].strftm) {
1573                     prline.u_str = (char*)malloc((FMT_LEG_LEN + 2) * sizeof(char));
1574                     strftime(prline.u_str,
1575                              FMT_LEG_LEN, im->gdes[i].format, &tmvdef);
1576                 } else if (bad_format(im->gdes[i].format)) {
1577                     rrd_set_error
1578                         ("bad format for PRINT in '%s'", im->gdes[i].format);
1579                     return -1;
1580                 } else {
1581                     prline.u_str =
1582                         sprintf_alloc(im->gdes[i].format, printval, si_symb);
1583                 }
1584                 grinfo_push(im,
1585                             sprintf_alloc
1586                             ("print[%ld]", prline_cnt++), RD_I_STR, prline);
1587                 free(prline.u_str);
1588             } else {
1589                 /* GF_GPRINT */
1590
1591                 if (im->gdes[i].strftm) {
1592                     strftime(im->gdes[i].legend,
1593                              FMT_LEG_LEN, im->gdes[i].format, &tmvdef);
1594                 } else {
1595                     if (bad_format(im->gdes[i].format)) {
1596                         rrd_set_error
1597                             ("bad format for GPRINT in '%s'",
1598                              im->gdes[i].format);
1599                         return -1;
1600                     }
1601 #ifdef HAVE_SNPRINTF
1602                     snprintf(im->gdes[i].legend,
1603                              FMT_LEG_LEN - 2,
1604                              im->gdes[i].format, printval, si_symb);
1605 #else
1606                     sprintf(im->gdes[i].legend,
1607                             im->gdes[i].format, printval, si_symb);
1608 #endif
1609                 }
1610                 graphelement = 1;
1611             }
1612             break;
1613         case GF_LINE:
1614         case GF_AREA:
1615         case GF_TICK:
1616             graphelement = 1;
1617             break;
1618         case GF_HRULE:
1619             if (isnan(im->gdes[i].yrule)) { /* we must set this here or the legend printer can not decide to print the legend */
1620                 im->gdes[i].yrule = im->gdes[vidx].vf.val;
1621             };
1622             graphelement = 1;
1623             break;
1624         case GF_VRULE:
1625             if (im->gdes[i].xrule == 0) {   /* again ... the legend printer needs it */
1626                 im->gdes[i].xrule = im->gdes[vidx].vf.when;
1627             };
1628             graphelement = 1;
1629             break;
1630         case GF_COMMENT:
1631         case GF_TEXTALIGN:
1632         case GF_DEF:
1633         case GF_CDEF:
1634         case GF_VDEF:
1635 #ifdef WITH_PIECHART
1636         case GF_PART:
1637 #endif
1638         case GF_SHIFT:
1639         case GF_XPORT:
1640             break;
1641         case GF_STACK:
1642             rrd_set_error
1643                 ("STACK should already be turned into LINE or AREA here");
1644             return -1;
1645             break;
1646         }
1647     }
1648     return graphelement;
1649 }
1650
1651
1652
1653 /* place legends with color spots */
1654 int leg_place(
1655     image_desc_t *im,
1656     int calc_width)
1657 {
1658     /* graph labels */
1659     int       interleg = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
1660     int       border = im->text_prop[TEXT_PROP_LEGEND].size * 2.0;
1661     int       fill = 0, fill_last;
1662     double    legendwidth; // = im->ximg - 2 * border;
1663     int       leg_c = 0;
1664     double    leg_x = border;
1665     int       leg_y = 0; //im->yimg;
1666     int       leg_y_prev = 0; // im->yimg;
1667     int       leg_cc;
1668     double    glue = 0;
1669     int       i, ii, mark = 0;
1670     char      default_txtalign = TXA_JUSTIFIED; /*default line orientation */
1671     int      *legspace;
1672     char     *tab;
1673     char      saved_legend[FMT_LEG_LEN + 5];
1674
1675     if(calc_width){
1676         legendwidth = 0;
1677     }
1678     else{
1679         legendwidth = im->legendwidth - 2 * border;
1680     }
1681
1682
1683     if (!(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH)) {
1684         if ((legspace = (int*)malloc(im->gdes_c * sizeof(int))) == NULL) {
1685             rrd_set_error("malloc for legspace");
1686             return -1;
1687         }
1688
1689         for (i = 0; i < im->gdes_c; i++) {
1690             char      prt_fctn; /*special printfunctions */
1691             if(calc_width){
1692                 strcpy(saved_legend, im->gdes[i].legend);
1693             }
1694
1695             fill_last = fill;
1696             /* hide legends for rules which are not displayed */
1697             if (im->gdes[i].gf == GF_TEXTALIGN) {
1698                 default_txtalign = im->gdes[i].txtalign;
1699             }
1700
1701             if (!(im->extra_flags & FORCE_RULES_LEGEND)) {
1702                 if (im->gdes[i].gf == GF_HRULE
1703                     && (im->gdes[i].yrule <
1704                         im->minval || im->gdes[i].yrule > im->maxval))
1705                     im->gdes[i].legend[0] = '\0';
1706                 if (im->gdes[i].gf == GF_VRULE
1707                     && (im->gdes[i].xrule <
1708                         im->start || im->gdes[i].xrule > im->end))
1709                     im->gdes[i].legend[0] = '\0';
1710             }
1711
1712             /* turn \\t into tab */
1713             while ((tab = strstr(im->gdes[i].legend, "\\t"))) {
1714                 memmove(tab, tab + 1, strlen(tab));
1715                 tab[0] = (char) 9;
1716             }
1717
1718             leg_cc = strlen(im->gdes[i].legend);
1719             /* is there a controle code at the end of the legend string ? */
1720             if (leg_cc >= 2 && im->gdes[i].legend[leg_cc - 2] == '\\') {
1721                 prt_fctn = im->gdes[i].legend[leg_cc - 1];
1722                 leg_cc -= 2;
1723                 im->gdes[i].legend[leg_cc] = '\0';
1724             } else {
1725                 prt_fctn = '\0';
1726             }
1727             /* only valid control codes */
1728             if (prt_fctn != 'l' && prt_fctn != 'n' &&   /* a synonym for l */
1729                 prt_fctn != 'r' &&
1730                 prt_fctn != 'j' &&
1731                 prt_fctn != 'c' &&
1732                 prt_fctn != 's' && prt_fctn != '\0' && prt_fctn != 'g') {
1733                 free(legspace);
1734                 rrd_set_error
1735                     ("Unknown control code at the end of '%s\\%c'",
1736                      im->gdes[i].legend, prt_fctn);
1737                 return -1;
1738             }
1739             /* \n -> \l */
1740             if (prt_fctn == 'n') {
1741                 prt_fctn = 'l';
1742             }
1743
1744             /* remove exess space from the end of the legend for \g */
1745             while (prt_fctn == 'g' &&
1746                    leg_cc > 0 && im->gdes[i].legend[leg_cc - 1] == ' ') {
1747                 leg_cc--;
1748                 im->gdes[i].legend[leg_cc] = '\0';
1749             }
1750
1751             if (leg_cc != 0) {
1752
1753                 /* no interleg space if string ends in \g */
1754                 legspace[i] = (prt_fctn == 'g' ? 0 : interleg);
1755                 if (fill > 0) {
1756                     fill += legspace[i];
1757                 }
1758                 fill +=
1759                     gfx_get_text_width(im,
1760                                        fill + border,
1761                                        im->
1762                                        text_prop
1763                                        [TEXT_PROP_LEGEND].
1764                                        font_desc,
1765                                        im->tabwidth, im->gdes[i].legend);
1766                 leg_c++;
1767             } else {
1768                 legspace[i] = 0;
1769             }
1770             /* who said there was a special tag ... ? */
1771             if (prt_fctn == 'g') {
1772                 prt_fctn = '\0';
1773             }
1774
1775             if (prt_fctn == '\0') {
1776                 if(calc_width && (fill > legendwidth)){
1777                     legendwidth = fill;
1778                 }
1779                 if (i == im->gdes_c - 1 || fill > legendwidth) {
1780                     /* just one legend item is left right or center */
1781                     switch (default_txtalign) {
1782                     case TXA_RIGHT:
1783                         prt_fctn = 'r';
1784                         break;
1785                     case TXA_CENTER:
1786                         prt_fctn = 'c';
1787                         break;
1788                     case TXA_JUSTIFIED:
1789                         prt_fctn = 'j';
1790                         break;
1791                     default:
1792                         prt_fctn = 'l';
1793                         break;
1794                     }
1795                 }
1796                 /* is it time to place the legends ? */
1797                 if (fill > legendwidth) {
1798                     if (leg_c > 1) {
1799                         /* go back one */
1800                         i--;
1801                         fill = fill_last;
1802                         leg_c--;
1803                     }
1804                 }
1805                 if (leg_c == 1 && prt_fctn == 'j') {
1806                     prt_fctn = 'l';
1807                 }
1808             }
1809
1810             if (prt_fctn != '\0') {
1811                 leg_x = border;
1812                 if (leg_c >= 2 && prt_fctn == 'j') {
1813                     glue = (double)(legendwidth - fill) / (double)(leg_c - 1);
1814                 } else {
1815                     glue = 0;
1816                 }
1817                 if (prt_fctn == 'c')
1818                     leg_x = (double)(legendwidth - fill) / 2.0;
1819                 if (prt_fctn == 'r')
1820                     leg_x = legendwidth - fill - border;
1821                 for (ii = mark; ii <= i; ii++) {
1822                     if (im->gdes[ii].legend[0] == '\0')
1823                         continue;   /* skip empty legends */
1824                     im->gdes[ii].leg_x = leg_x;
1825                     im->gdes[ii].leg_y = leg_y + border;
1826                     leg_x +=
1827                         (double)gfx_get_text_width(im, leg_x,
1828                                            im->
1829                                            text_prop
1830                                            [TEXT_PROP_LEGEND].
1831                                            font_desc,
1832                                            im->tabwidth, im->gdes[ii].legend)
1833                         +(double)legspace[ii]
1834                         + glue;
1835                 }
1836                 leg_y_prev = leg_y;
1837                 if (leg_x > border || prt_fctn == 's')
1838                     leg_y += im->text_prop[TEXT_PROP_LEGEND].size * 1.8;
1839                 if (prt_fctn == 's')
1840                     leg_y -= im->text_prop[TEXT_PROP_LEGEND].size;
1841
1842                 if(calc_width && (fill > legendwidth)){
1843                     legendwidth = fill;
1844                 }
1845                 fill = 0;
1846                 leg_c = 0;
1847                 mark = ii;
1848             }
1849
1850             if(calc_width){
1851                 strcpy(im->gdes[i].legend, saved_legend);
1852             }
1853         }
1854
1855         if(calc_width){
1856             im->legendwidth = legendwidth + 2 * border;
1857         }
1858         else{
1859             im->legendheight = leg_y + border * 0.6;
1860         }
1861         free(legspace);
1862     }
1863     return 0;
1864 }
1865
1866 /* create a grid on the graph. it determines what to do
1867    from the values of xsize, start and end */
1868
1869 /* the xaxis labels are determined from the number of seconds per pixel
1870    in the requested graph */
1871
1872 int calc_horizontal_grid(
1873     image_desc_t
1874     *im)
1875 {
1876     double    range;
1877     double    scaledrange;
1878     int       pixel, i;
1879     int       gridind = 0;
1880     int       decimals, fractionals;
1881
1882     im->ygrid_scale.labfact = 2;
1883     range = im->maxval - im->minval;
1884     scaledrange = range / im->magfact;
1885     /* does the scale of this graph make it impossible to put lines
1886        on it? If so, give up. */
1887     if (isnan(scaledrange)) {
1888         return 0;
1889     }
1890
1891     /* find grid spaceing */
1892     pixel = 1;
1893     if (isnan(im->ygridstep)) {
1894         if (im->extra_flags & ALTYGRID) {
1895             /* find the value with max number of digits. Get number of digits */
1896             decimals =
1897                 ceil(log10
1898                      (max(fabs(im->maxval), fabs(im->minval)) *
1899                       im->viewfactor / im->magfact));
1900             if (decimals <= 0)  /* everything is small. make place for zero */
1901                 decimals = 1;
1902             im->ygrid_scale.gridstep =
1903                 pow((double) 10,
1904                     floor(log10(range * im->viewfactor / im->magfact))) /
1905                 im->viewfactor * im->magfact;
1906             if (im->ygrid_scale.gridstep == 0)  /* range is one -> 0.1 is reasonable scale */
1907                 im->ygrid_scale.gridstep = 0.1;
1908             /* should have at least 5 lines but no more then 15 */
1909             if (range / im->ygrid_scale.gridstep < 5
1910                 && im->ygrid_scale.gridstep >= 30)
1911                 im->ygrid_scale.gridstep /= 10;
1912             if (range / im->ygrid_scale.gridstep > 15)
1913                 im->ygrid_scale.gridstep *= 10;
1914             if (range / im->ygrid_scale.gridstep > 5) {
1915                 im->ygrid_scale.labfact = 1;
1916                 if (range / im->ygrid_scale.gridstep > 8
1917                     || im->ygrid_scale.gridstep <
1918                     1.8 * im->text_prop[TEXT_PROP_AXIS].size)
1919                     im->ygrid_scale.labfact = 2;
1920             } else {
1921                 im->ygrid_scale.gridstep /= 5;
1922                 im->ygrid_scale.labfact = 5;
1923             }
1924             fractionals =
1925                 floor(log10
1926                       (im->ygrid_scale.gridstep *
1927                        (double) im->ygrid_scale.labfact * im->viewfactor /
1928                        im->magfact));
1929             if (fractionals < 0) {  /* small amplitude. */
1930                 int       len = decimals - fractionals + 1;
1931
1932                 if (im->unitslength < len + 2)
1933                     im->unitslength = len + 2;
1934                 sprintf(im->ygrid_scale.labfmt,
1935                         "%%%d.%df%s", len,
1936                         -fractionals, (im->symbol != ' ' ? " %c" : ""));
1937             } else {
1938                 int       len = decimals + 1;
1939
1940                 if (im->unitslength < len + 2)
1941                     im->unitslength = len + 2;
1942                 sprintf(im->ygrid_scale.labfmt,
1943                         "%%%d.0f%s", len, (im->symbol != ' ' ? " %c" : ""));
1944             }
1945         } else {        /* classic rrd grid */
1946             for (i = 0; ylab[i].grid > 0; i++) {
1947                 pixel = im->ysize / (scaledrange / ylab[i].grid);
1948                 gridind = i;
1949                 if (pixel >= 5)
1950                     break;
1951             }
1952
1953             for (i = 0; i < 4; i++) {
1954                 if (pixel * ylab[gridind].lfac[i] >=
1955                     1.8 * im->text_prop[TEXT_PROP_AXIS].size) {
1956                     im->ygrid_scale.labfact = ylab[gridind].lfac[i];
1957                     break;
1958                 }
1959             }
1960
1961             im->ygrid_scale.gridstep = ylab[gridind].grid * im->magfact;
1962         }
1963     } else {
1964         im->ygrid_scale.gridstep = im->ygridstep;
1965         im->ygrid_scale.labfact = im->ylabfact;
1966     }
1967     return 1;
1968 }
1969
1970 int draw_horizontal_grid(
1971     image_desc_t
1972     *im)
1973 {
1974     int       i;
1975     double    scaledstep;
1976     char      graph_label[100];
1977     int       nlabels = 0;
1978     double    X0 = im->xorigin;
1979     double    X1 = im->xorigin + im->xsize;
1980     int       sgrid = (int) (im->minval / im->ygrid_scale.gridstep - 1);
1981     int       egrid = (int) (im->maxval / im->ygrid_scale.gridstep + 1);
1982     double    MaxY;
1983     double second_axis_magfact = 0;
1984     char *second_axis_symb = "";
1985     
1986     scaledstep =
1987         im->ygrid_scale.gridstep /
1988         (double) im->magfact * (double) im->viewfactor;
1989     MaxY = scaledstep * (double) egrid;
1990     for (i = sgrid; i <= egrid; i++) {
1991         double    Y0 = ytr(im,
1992                            im->ygrid_scale.gridstep * i);
1993         double    YN = ytr(im,
1994                            im->ygrid_scale.gridstep * (i + 1));
1995
1996         if (floor(Y0 + 0.5) >=
1997             im->yorigin - im->ysize && floor(Y0 + 0.5) <= im->yorigin) {
1998             /* Make sure at least 2 grid labels are shown, even if it doesn't agree
1999                with the chosen settings. Add a label if required by settings, or if
2000                there is only one label so far and the next grid line is out of bounds. */
2001             if (i % im->ygrid_scale.labfact == 0
2002                 || (nlabels == 1
2003                     && (YN < im->yorigin - im->ysize || YN > im->yorigin))) {
2004                 if (im->symbol == ' ') {
2005                     if (im->extra_flags & ALTYGRID) {
2006                         sprintf(graph_label,
2007                                 im->ygrid_scale.labfmt,
2008                                 scaledstep * (double) i);
2009                     } else {
2010                         if (MaxY < 10) {
2011                             sprintf(graph_label, "%4.1f",
2012                                     scaledstep * (double) i);
2013                         } else {
2014                             sprintf(graph_label, "%4.0f",
2015                                     scaledstep * (double) i);
2016                         }
2017                     }
2018                 } else {
2019                     char      sisym = (i == 0 ? ' ' : im->symbol);
2020
2021                     if (im->extra_flags & ALTYGRID) {
2022                         sprintf(graph_label,
2023                                 im->ygrid_scale.labfmt,
2024                                 scaledstep * (double) i, sisym);
2025                     } else {
2026                         if (MaxY < 10) {
2027                             sprintf(graph_label, "%4.1f %c",
2028                                     scaledstep * (double) i, sisym);
2029                         } else {
2030                             sprintf(graph_label, "%4.0f %c",
2031                                     scaledstep * (double) i, sisym);
2032                         }
2033                     }
2034                 }
2035                 nlabels++;
2036                 if (im->second_axis_scale != 0){
2037                         char graph_label_right[100];
2038                         double sval = im->ygrid_scale.gridstep*(double)i*im->second_axis_scale+im->second_axis_shift;
2039                         if (im->second_axis_format[0] == '\0'){
2040                             if (!second_axis_magfact){
2041                                 double dummy = im->ygrid_scale.gridstep*(double)(sgrid+egrid)/2.0*im->second_axis_scale+im->second_axis_shift;
2042                                 auto_scale(im,&dummy,&second_axis_symb,&second_axis_magfact);
2043                             }
2044                             sval /= second_axis_magfact;
2045  
2046                             if(MaxY < 10) { 
2047                                 sprintf(graph_label_right,"%5.1f %s",sval,second_axis_symb);
2048                             } else {
2049                                 sprintf(graph_label_right,"%5.0f %s",sval,second_axis_symb);
2050                             }
2051                         }
2052                         else {
2053                            sprintf(graph_label_right,im->second_axis_format,sval);
2054                         }        
2055                         gfx_text ( im,
2056                                X1+7, Y0,
2057                                im->graph_col[GRC_FONT],
2058                                im->text_prop[TEXT_PROP_AXIS].font_desc,
2059                                im->tabwidth,0.0, GFX_H_LEFT, GFX_V_CENTER,
2060                                graph_label_right );
2061                 }
2062  
2063                 gfx_text(im,
2064                          X0 -
2065                          im->
2066                          text_prop[TEXT_PROP_AXIS].
2067                          size, Y0,
2068                          im->graph_col[GRC_FONT],
2069                          im->
2070                          text_prop[TEXT_PROP_AXIS].
2071                          font_desc,
2072                          im->tabwidth, 0.0,
2073                          GFX_H_RIGHT, GFX_V_CENTER, graph_label);
2074                 gfx_line(im, X0 - 2, Y0, X0, Y0,
2075                          MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2076                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2077                          MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2078                 gfx_dashed_line(im, X0 - 2, Y0,
2079                                 X1 + 2, Y0,
2080                                 MGRIDWIDTH,
2081                                 im->
2082                                 graph_col
2083                                 [GRC_MGRID],
2084                                 im->grid_dash_on, im->grid_dash_off);
2085             } else if (!(im->extra_flags & NOMINOR)) {
2086                 gfx_line(im,
2087                          X0 - 2, Y0,
2088                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2089                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2090                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2091                 gfx_dashed_line(im, X0 - 1, Y0,
2092                                 X1 + 1, Y0,
2093                                 GRIDWIDTH,
2094                                 im->
2095                                 graph_col[GRC_GRID],
2096                                 im->grid_dash_on, im->grid_dash_off);
2097             }
2098         }
2099     }
2100     return 1;
2101 }
2102
2103 /* this is frexp for base 10 */
2104 double    frexp10(
2105     double,
2106     double *);
2107 double frexp10(
2108     double x,
2109     double *e)
2110 {
2111     double    mnt;
2112     int       iexp;
2113
2114     iexp = floor(log((double)fabs(x)) / log((double)10));
2115     mnt = x / pow(10.0, iexp);
2116     if (mnt >= 10.0) {
2117         iexp++;
2118         mnt = x / pow(10.0, iexp);
2119     }
2120     *e = iexp;
2121     return mnt;
2122 }
2123
2124
2125 /* logaritmic horizontal grid */
2126 int horizontal_log_grid(
2127     image_desc_t
2128     *im)
2129 {
2130     double    yloglab[][10] = {
2131         {
2132          1.0, 10., 0.0, 0.0, 0.0, 0.0, 0.0,
2133          0.0, 0.0, 0.0}, {
2134                           1.0, 5.0, 10., 0.0, 0.0, 0.0, 0.0,
2135                           0.0, 0.0, 0.0}, {
2136                                            1.0, 2.0, 5.0, 7.0, 10., 0.0, 0.0,
2137                                            0.0, 0.0, 0.0}, {
2138                                                             1.0, 2.0, 4.0,
2139                                                             6.0, 8.0, 10.,
2140                                                             0.0,
2141                                                             0.0, 0.0, 0.0}, {
2142                                                                              1.0,
2143                                                                              2.0,
2144                                                                              3.0,
2145                                                                              4.0,
2146                                                                              5.0,
2147                                                                              6.0,
2148                                                                              7.0,
2149                                                                              8.0,
2150                                                                              9.0,
2151                                                                              10.},
2152         {
2153          0, 0, 0, 0, 0, 0, 0, 0, 0, 0}  /* last line */
2154     };
2155     int       i, j, val_exp, min_exp;
2156     double    nex;      /* number of decades in data */
2157     double    logscale; /* scale in logarithmic space */
2158     int       exfrac = 1;   /* decade spacing */
2159     int       mid = -1; /* row in yloglab for major grid */
2160     double    mspac;    /* smallest major grid spacing (pixels) */
2161     int       flab;     /* first value in yloglab to use */
2162     double    value, tmp, pre_value;
2163     double    X0, X1, Y0;
2164     char      graph_label[100];
2165
2166     nex = log10(im->maxval / im->minval);
2167     logscale = im->ysize / nex;
2168     /* major spacing for data with high dynamic range */
2169     while (logscale * exfrac < 3 * im->text_prop[TEXT_PROP_LEGEND].size) {
2170         if (exfrac == 1)
2171             exfrac = 3;
2172         else
2173             exfrac += 3;
2174     }
2175
2176     /* major spacing for less dynamic data */
2177     do {
2178         /* search best row in yloglab */
2179         mid++;
2180         for (i = 0; yloglab[mid][i + 1] < 10.0; i++);
2181         mspac = logscale * log10(10.0 / yloglab[mid][i]);
2182     }
2183     while (mspac >
2184            2 * im->text_prop[TEXT_PROP_LEGEND].size && yloglab[mid][0] > 0);
2185     if (mid)
2186         mid--;
2187     /* find first value in yloglab */
2188     for (flab = 0;
2189          yloglab[mid][flab] < 10
2190          && frexp10(im->minval, &tmp) > yloglab[mid][flab]; flab++);
2191     if (yloglab[mid][flab] == 10.0) {
2192         tmp += 1.0;
2193         flab = 0;
2194     }
2195     val_exp = tmp;
2196     if (val_exp % exfrac)
2197         val_exp += abs(-val_exp % exfrac);
2198     X0 = im->xorigin;
2199     X1 = im->xorigin + im->xsize;
2200     /* draw grid */
2201     pre_value = DNAN;
2202     while (1) {
2203
2204         value = yloglab[mid][flab] * pow(10.0, val_exp);
2205         if (AlmostEqual2sComplement(value, pre_value, 4))
2206             break;      /* it seems we are not converging */
2207         pre_value = value;
2208         Y0 = ytr(im, value);
2209         if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2210             break;
2211         /* major grid line */
2212         gfx_line(im,
2213                  X0 - 2, Y0, X0, Y0, MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2214         gfx_line(im, X1, Y0, X1 + 2, Y0,
2215                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2216         gfx_dashed_line(im, X0 - 2, Y0,
2217                         X1 + 2, Y0,
2218                         MGRIDWIDTH,
2219                         im->
2220                         graph_col
2221                         [GRC_MGRID], im->grid_dash_on, im->grid_dash_off);
2222         /* label */
2223         if (im->extra_flags & FORCE_UNITS_SI) {
2224             int       scale;
2225             double    pvalue;
2226             char      symbol;
2227
2228             scale = floor(val_exp / 3.0);
2229             if (value >= 1.0)
2230                 pvalue = pow(10.0, val_exp % 3);
2231             else
2232                 pvalue = pow(10.0, ((val_exp + 1) % 3) + 2);
2233             pvalue *= yloglab[mid][flab];
2234             if (((scale + si_symbcenter) < (int) sizeof(si_symbol))
2235                 && ((scale + si_symbcenter) >= 0))
2236                 symbol = si_symbol[scale + si_symbcenter];
2237             else
2238                 symbol = '?';
2239             sprintf(graph_label, "%3.0f %c", pvalue, symbol);
2240         } else {            
2241             sprintf(graph_label, "%3.0e", value);
2242         }
2243         if (im->second_axis_scale != 0){
2244                 char graph_label_right[100];
2245                 double sval = value*im->second_axis_scale+im->second_axis_shift;
2246                 if (im->second_axis_format[0] == '\0'){
2247                         if (im->extra_flags & FORCE_UNITS_SI) {
2248                                 double mfac = 1;
2249                                 char   *symb = "";
2250                                 auto_scale(im,&sval,&symb,&mfac);
2251                                 sprintf(graph_label_right,"%4.0f %s", sval,symb);
2252                         }
2253                         else {        
2254                                 sprintf(graph_label_right,"%3.0e", sval);
2255                         }
2256                 }
2257                 else {
2258                       sprintf(graph_label_right,im->second_axis_format,sval);
2259                 }    
2260     
2261                 gfx_text ( im,
2262                                X1+7, Y0,
2263                                im->graph_col[GRC_FONT],
2264                                im->text_prop[TEXT_PROP_AXIS].font_desc,
2265                                im->tabwidth,0.0, GFX_H_LEFT, GFX_V_CENTER,
2266                                graph_label_right );
2267         }
2268       
2269         gfx_text(im,
2270                  X0 -
2271                  im->
2272                  text_prop[TEXT_PROP_AXIS].
2273                  size, Y0,
2274                  im->graph_col[GRC_FONT],
2275                  im->
2276                  text_prop[TEXT_PROP_AXIS].
2277                  font_desc,
2278                  im->tabwidth, 0.0,
2279                  GFX_H_RIGHT, GFX_V_CENTER, graph_label);
2280         /* minor grid */
2281         if (mid < 4 && exfrac == 1) {
2282             /* find first and last minor line behind current major line
2283              * i is the first line and j tha last */
2284             if (flab == 0) {
2285                 min_exp = val_exp - 1;
2286                 for (i = 1; yloglab[mid][i] < 10.0; i++);
2287                 i = yloglab[mid][i - 1] + 1;
2288                 j = 10;
2289             } else {
2290                 min_exp = val_exp;
2291                 i = yloglab[mid][flab - 1] + 1;
2292                 j = yloglab[mid][flab];
2293             }
2294
2295             /* draw minor lines below current major line */
2296             for (; i < j; i++) {
2297
2298                 value = i * pow(10.0, min_exp);
2299                 if (value < im->minval)
2300                     continue;
2301                 Y0 = ytr(im, value);
2302                 if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2303                     break;
2304                 /* draw lines */
2305                 gfx_line(im,
2306                          X0 - 2, Y0,
2307                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2308                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2309                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2310                 gfx_dashed_line(im, X0 - 1, Y0,
2311                                 X1 + 1, Y0,
2312                                 GRIDWIDTH,
2313                                 im->
2314                                 graph_col[GRC_GRID],
2315                                 im->grid_dash_on, im->grid_dash_off);
2316             }
2317         } else if (exfrac > 1) {
2318             for (i = val_exp - exfrac / 3 * 2; i < val_exp; i += exfrac / 3) {
2319                 value = pow(10.0, i);
2320                 if (value < im->minval)
2321                     continue;
2322                 Y0 = ytr(im, value);
2323                 if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2324                     break;
2325                 /* draw lines */
2326                 gfx_line(im,
2327                          X0 - 2, Y0,
2328                          X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2329                 gfx_line(im, X1, Y0, X1 + 2, Y0,
2330                          GRIDWIDTH, im->graph_col[GRC_GRID]);
2331                 gfx_dashed_line(im, X0 - 1, Y0,
2332                                 X1 + 1, Y0,
2333                                 GRIDWIDTH,
2334                                 im->
2335                                 graph_col[GRC_GRID],
2336                                 im->grid_dash_on, im->grid_dash_off);
2337             }
2338         }
2339
2340         /* next decade */
2341         if (yloglab[mid][++flab] == 10.0) {
2342             flab = 0;
2343             val_exp += exfrac;
2344         }
2345     }
2346
2347     /* draw minor lines after highest major line */
2348     if (mid < 4 && exfrac == 1) {
2349         /* find first and last minor line below current major line
2350          * i is the first line and j tha last */
2351         if (flab == 0) {
2352             min_exp = val_exp - 1;
2353             for (i = 1; yloglab[mid][i] < 10.0; i++);
2354             i = yloglab[mid][i - 1] + 1;
2355             j = 10;
2356         } else {
2357             min_exp = val_exp;
2358             i = yloglab[mid][flab - 1] + 1;
2359             j = yloglab[mid][flab];
2360         }
2361
2362         /* draw minor lines below current major line */
2363         for (; i < j; i++) {
2364
2365             value = i * pow(10.0, min_exp);
2366             if (value < im->minval)
2367                 continue;
2368             Y0 = ytr(im, value);
2369             if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2370                 break;
2371             /* draw lines */
2372             gfx_line(im,
2373                      X0 - 2, Y0, X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2374             gfx_line(im, X1, Y0, X1 + 2, Y0,
2375                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2376             gfx_dashed_line(im, X0 - 1, Y0,
2377                             X1 + 1, Y0,
2378                             GRIDWIDTH,
2379                             im->
2380                             graph_col[GRC_GRID],
2381                             im->grid_dash_on, im->grid_dash_off);
2382         }
2383     }
2384     /* fancy minor gridlines */
2385     else if (exfrac > 1) {
2386         for (i = val_exp - exfrac / 3 * 2; i < val_exp; i += exfrac / 3) {
2387             value = pow(10.0, i);
2388             if (value < im->minval)
2389                 continue;
2390             Y0 = ytr(im, value);
2391             if (floor(Y0 + 0.5) <= im->yorigin - im->ysize)
2392                 break;
2393             /* draw lines */
2394             gfx_line(im,
2395                      X0 - 2, Y0, X0, Y0, GRIDWIDTH, im->graph_col[GRC_GRID]);
2396             gfx_line(im, X1, Y0, X1 + 2, Y0,
2397                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2398             gfx_dashed_line(im, X0 - 1, Y0,
2399                             X1 + 1, Y0,
2400                             GRIDWIDTH,
2401                             im->
2402                             graph_col[GRC_GRID],
2403                             im->grid_dash_on, im->grid_dash_off);
2404         }
2405     }
2406
2407     return 1;
2408 }
2409
2410
2411 void vertical_grid(
2412     image_desc_t *im)
2413 {
2414     int       xlab_sel; /* which sort of label and grid ? */
2415     time_t    ti, tilab, timajor;
2416     long      factor;
2417     char      graph_label[100];
2418     double    X0, Y0, Y1;   /* points for filled graph and more */
2419     struct tm tm;
2420
2421     /* the type of time grid is determined by finding
2422        the number of seconds per pixel in the graph */
2423     if (im->xlab_user.minsec == -1) {
2424         factor = (im->end - im->start) / im->xsize;
2425         xlab_sel = 0;
2426         while (xlab[xlab_sel + 1].minsec !=
2427                -1 && xlab[xlab_sel + 1].minsec <= factor) {
2428             xlab_sel++;
2429         }               /* pick the last one */
2430         while (xlab[xlab_sel - 1].minsec ==
2431                xlab[xlab_sel].minsec
2432                && xlab[xlab_sel].length > (im->end - im->start)) {
2433             xlab_sel--;
2434         }               /* go back to the smallest size */
2435         im->xlab_user.gridtm = xlab[xlab_sel].gridtm;
2436         im->xlab_user.gridst = xlab[xlab_sel].gridst;
2437         im->xlab_user.mgridtm = xlab[xlab_sel].mgridtm;
2438         im->xlab_user.mgridst = xlab[xlab_sel].mgridst;
2439         im->xlab_user.labtm = xlab[xlab_sel].labtm;
2440         im->xlab_user.labst = xlab[xlab_sel].labst;
2441         im->xlab_user.precis = xlab[xlab_sel].precis;
2442         im->xlab_user.stst = xlab[xlab_sel].stst;
2443     }
2444
2445     /* y coords are the same for every line ... */
2446     Y0 = im->yorigin;
2447     Y1 = im->yorigin - im->ysize;
2448     /* paint the minor grid */
2449     if (!(im->extra_flags & NOMINOR)) {
2450         for (ti = find_first_time(im->start,
2451                                   im->
2452                                   xlab_user.
2453                                   gridtm,
2454                                   im->
2455                                   xlab_user.
2456                                   gridst),
2457              timajor =
2458              find_first_time(im->start,
2459                              im->xlab_user.
2460                              mgridtm,
2461                              im->xlab_user.
2462                              mgridst);
2463              ti < im->end;
2464              ti =
2465              find_next_time(ti, im->xlab_user.gridtm, im->xlab_user.gridst)
2466             ) {
2467             /* are we inside the graph ? */
2468             if (ti < im->start || ti > im->end)
2469                 continue;
2470             while (timajor < ti) {
2471                 timajor = find_next_time(timajor,
2472                                          im->
2473                                          xlab_user.
2474                                          mgridtm, im->xlab_user.mgridst);
2475             }
2476             if (ti == timajor)
2477                 continue;   /* skip as falls on major grid line */
2478             X0 = xtr(im, ti);
2479             gfx_line(im, X0, Y1 - 2, X0, Y1,
2480                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2481             gfx_line(im, X0, Y0, X0, Y0 + 2,
2482                      GRIDWIDTH, im->graph_col[GRC_GRID]);
2483             gfx_dashed_line(im, X0, Y0 + 1, X0,
2484                             Y1 - 1, GRIDWIDTH,
2485                             im->
2486                             graph_col[GRC_GRID],
2487                             im->grid_dash_on, im->grid_dash_off);
2488         }
2489     }
2490
2491     /* paint the major grid */
2492     for (ti = find_first_time(im->start,
2493                               im->
2494                               xlab_user.
2495                               mgridtm,
2496                               im->
2497                               xlab_user.
2498                               mgridst);
2499          ti < im->end;
2500          ti = find_next_time(ti, im->xlab_user.mgridtm, im->xlab_user.mgridst)
2501         ) {
2502         /* are we inside the graph ? */
2503         if (ti < im->start || ti > im->end)
2504             continue;
2505         X0 = xtr(im, ti);
2506         gfx_line(im, X0, Y1 - 2, X0, Y1,
2507                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2508         gfx_line(im, X0, Y0, X0, Y0 + 3,
2509                  MGRIDWIDTH, im->graph_col[GRC_MGRID]);
2510         gfx_dashed_line(im, X0, Y0 + 3, X0,
2511                         Y1 - 2, MGRIDWIDTH,
2512                         im->
2513                         graph_col
2514                         [GRC_MGRID], im->grid_dash_on, im->grid_dash_off);
2515     }
2516     /* paint the labels below the graph */
2517     for (ti =
2518          find_first_time(im->start -
2519                          im->xlab_user.
2520                          precis / 2,
2521                          im->xlab_user.
2522                          labtm,
2523                          im->xlab_user.
2524                          labst);
2525          ti <=
2526          im->end -
2527          im->xlab_user.precis / 2;
2528          ti = find_next_time(ti, im->xlab_user.labtm, im->xlab_user.labst)
2529         ) {
2530         tilab = ti + im->xlab_user.precis / 2;  /* correct time for the label */
2531         /* are we inside the graph ? */
2532         if (tilab < im->start || tilab > im->end)
2533             continue;
2534 #if HAVE_STRFTIME
2535         localtime_r(&tilab, &tm);
2536         strftime(graph_label, 99, im->xlab_user.stst, &tm);
2537 #else
2538 # error "your libc has no strftime I guess we'll abort the exercise here."
2539 #endif
2540         gfx_text(im,
2541                  xtr(im, tilab),
2542                  Y0 + 3,
2543                  im->graph_col[GRC_FONT],
2544                  im->
2545                  text_prop[TEXT_PROP_AXIS].
2546                  font_desc,
2547                  im->tabwidth, 0.0,
2548                  GFX_H_CENTER, GFX_V_TOP, graph_label);
2549     }
2550
2551 }
2552
2553
2554 void axis_paint(
2555     image_desc_t *im)
2556 {
2557     /* draw x and y axis */
2558     /* gfx_line ( im->canvas, im->xorigin+im->xsize,im->yorigin,
2559        im->xorigin+im->xsize,im->yorigin-im->ysize,
2560        GRIDWIDTH, im->graph_col[GRC_AXIS]);
2561
2562        gfx_line ( im->canvas, im->xorigin,im->yorigin-im->ysize,
2563        im->xorigin+im->xsize,im->yorigin-im->ysize,
2564        GRIDWIDTH, im->graph_col[GRC_AXIS]); */
2565
2566     gfx_line(im, im->xorigin - 4,
2567              im->yorigin,
2568              im->xorigin + im->xsize +
2569              4, im->yorigin, MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2570     gfx_line(im, im->xorigin,
2571              im->yorigin + 4,
2572              im->xorigin,
2573              im->yorigin - im->ysize -
2574              4, MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2575     /* arrow for X and Y axis direction */
2576     gfx_new_area(im, im->xorigin + im->xsize + 2, im->yorigin - 3, im->xorigin + im->xsize + 2, im->yorigin + 3, im->xorigin + im->xsize + 7, im->yorigin,  /* horyzontal */
2577                  im->graph_col[GRC_ARROW]);
2578     gfx_close_path(im);
2579     gfx_new_area(im, im->xorigin - 3, im->yorigin - im->ysize - 2, im->xorigin + 3, im->yorigin - im->ysize - 2, im->xorigin, im->yorigin - im->ysize - 7,  /* vertical */
2580                  im->graph_col[GRC_ARROW]);
2581     gfx_close_path(im);
2582     if (im->second_axis_scale != 0){
2583        gfx_line ( im, im->xorigin+im->xsize,im->yorigin+4,
2584                          im->xorigin+im->xsize,im->yorigin-im->ysize-4,
2585                          MGRIDWIDTH, im->graph_col[GRC_AXIS]);
2586        gfx_new_area ( im, 
2587                    im->xorigin+im->xsize-2,  im->yorigin-im->ysize-2,
2588                    im->xorigin+im->xsize+3,  im->yorigin-im->ysize-2,
2589                    im->xorigin+im->xsize,    im->yorigin-im->ysize-7, /* LINEOFFSET */
2590                    im->graph_col[GRC_ARROW]);
2591        gfx_close_path(im);
2592     }
2593
2594 }
2595
2596 void grid_paint(
2597     image_desc_t *im)
2598 {
2599     long      i;
2600     int       res = 0;
2601     double    X0, Y0;   /* points for filled graph and more */
2602     struct gfx_color_t water_color;
2603
2604     /* draw 3d border */
2605     gfx_new_area(im, 0, im->yimg,
2606                  2, im->yimg - 2, 2, 2, im->graph_col[GRC_SHADEA]);
2607     gfx_add_point(im, im->ximg - 2, 2);
2608     gfx_add_point(im, im->ximg, 0);
2609     gfx_add_point(im, 0, 0);
2610     gfx_close_path(im);
2611     gfx_new_area(im, 2, im->yimg - 2,
2612                  im->ximg - 2,
2613                  im->yimg - 2, im->ximg - 2, 2, im->graph_col[GRC_SHADEB]);
2614     gfx_add_point(im, im->ximg, 0);
2615     gfx_add_point(im, im->ximg, im->yimg);
2616     gfx_add_point(im, 0, im->yimg);
2617     gfx_close_path(im);
2618     if (im->draw_x_grid == 1)
2619         vertical_grid(im);
2620     if (im->draw_y_grid == 1) {
2621         if (im->logarithmic) {
2622             res = horizontal_log_grid(im);
2623         } else {
2624             res = draw_horizontal_grid(im);
2625         }
2626
2627         /* dont draw horizontal grid if there is no min and max val */
2628         if (!res) {
2629             char     *nodata = "No Data found";
2630
2631             gfx_text(im, im->ximg / 2,
2632                      (2 * im->yorigin -
2633                       im->ysize) / 2,
2634                      im->graph_col[GRC_FONT],
2635                      im->
2636                      text_prop[TEXT_PROP_AXIS].
2637                      font_desc,
2638                      im->tabwidth, 0.0,
2639                      GFX_H_CENTER, GFX_V_CENTER, nodata);
2640         }
2641     }
2642
2643     /* yaxis unit description */
2644     if (im->ylegend[0] != '\0'){
2645         gfx_text(im,
2646                  im->xOriginLegendY+10,
2647                  im->yOriginLegendY,
2648                  im->graph_col[GRC_FONT],
2649                  im->
2650                  text_prop[TEXT_PROP_UNIT].
2651                  font_desc,
2652                  im->tabwidth,
2653                  RRDGRAPH_YLEGEND_ANGLE, GFX_H_CENTER, GFX_V_CENTER, im->ylegend);
2654
2655     }
2656     if (im->second_axis_legend[0] != '\0'){
2657             gfx_text( im,
2658                   im->xOriginLegendY2+10, 
2659                   im->yOriginLegendY2,
2660                   im->graph_col[GRC_FONT],
2661                   im->text_prop[TEXT_PROP_UNIT].font_desc,
2662                   im->tabwidth, 
2663                   RRDGRAPH_YLEGEND_ANGLE,
2664                   GFX_H_CENTER, GFX_V_CENTER,
2665                   im->second_axis_legend);
2666     }        
2667  
2668     /* graph title */
2669     gfx_text(im,
2670              im->xOriginTitle, im->yOriginTitle+6,
2671              im->graph_col[GRC_FONT],
2672              im->
2673              text_prop[TEXT_PROP_TITLE].
2674              font_desc,
2675              im->tabwidth, 0.0, GFX_H_CENTER, GFX_V_TOP, im->title);
2676     /* rrdtool 'logo' */
2677     if (!(im->extra_flags & NO_RRDTOOL_TAG)){
2678         water_color = im->graph_col[GRC_FONT];
2679         water_color.alpha = 0.3;
2680         double xpos = im->legendposition == EAST ? im->xOriginLegendY : im->ximg - 4;
2681         gfx_text(im, xpos, 5,
2682                  water_color,
2683                  im->
2684                  text_prop[TEXT_PROP_WATERMARK].
2685                  font_desc, im->tabwidth,
2686                  -90, GFX_H_LEFT, GFX_V_TOP, "RRDTOOL / TOBI OETIKER");
2687     }    
2688     /* graph watermark */
2689     if (im->watermark[0] != '\0') {
2690         water_color = im->graph_col[GRC_FONT];
2691         water_color.alpha = 0.3;
2692         gfx_text(im,
2693                  im->ximg / 2, im->yimg - 6,
2694                  water_color,
2695                  im->
2696                  text_prop[TEXT_PROP_WATERMARK].
2697                  font_desc, im->tabwidth, 0,
2698                  GFX_H_CENTER, GFX_V_BOTTOM, im->watermark);
2699     }
2700
2701     /* graph labels */
2702     if (!(im->extra_flags & NOLEGEND) & !(im->extra_flags & ONLY_GRAPH)) {
2703         for (i = 0; i < im->gdes_c; i++) {
2704             if (im->gdes[i].legend[0] == '\0')
2705                 continue;
2706             /* im->gdes[i].leg_y is the bottom of the legend */
2707             X0 = im->xOriginLegend + im->gdes[i].leg_x;
2708             Y0 = im->legenddirection == TOP_DOWN ? im->yOriginLegend + im->gdes[i].leg_y : im->yOriginLegend + im->legendheight - im->gdes[i].leg_y;
2709             gfx_text(im, X0, Y0,
2710                      im->graph_col[GRC_FONT],
2711                      im->
2712                      text_prop
2713                      [TEXT_PROP_LEGEND].font_desc,
2714                      im->tabwidth, 0.0,
2715                      GFX_H_LEFT, GFX_V_BOTTOM, im->gdes[i].legend);
2716             /* The legend for GRAPH items starts with "M " to have
2717                enough space for the box */
2718             if (im->gdes[i].gf != GF_PRINT &&
2719                 im->gdes[i].gf != GF_GPRINT && im->gdes[i].gf != GF_COMMENT) {
2720                 double    boxH, boxV;
2721                 double    X1, Y1;
2722
2723                 boxH = gfx_get_text_width(im, 0,
2724                                           im->
2725                                           text_prop
2726                                           [TEXT_PROP_LEGEND].
2727                                           font_desc,
2728                                           im->tabwidth, "o") * 1.2;
2729                 boxV = boxH;
2730                 /* shift the box up a bit */
2731                 Y0 -= boxV * 0.4;
2732                 /* make sure transparent colors show up the same way as in the graph */
2733                 gfx_new_area(im,
2734                              X0, Y0 - boxV,
2735                              X0, Y0, X0 + boxH, Y0, im->graph_col[GRC_BACK]);
2736                 gfx_add_point(im, X0 + boxH, Y0 - boxV);
2737                 gfx_close_path(im);
2738                 gfx_new_area(im, X0, Y0 - boxV, X0,
2739                              Y0, X0 + boxH, Y0, im->gdes[i].col);
2740                 gfx_add_point(im, X0 + boxH, Y0 - boxV);
2741                 gfx_close_path(im);
2742                 cairo_save(im->cr);
2743                 cairo_new_path(im->cr);
2744                 cairo_set_line_width(im->cr, 1.0);
2745                 X1 = X0 + boxH;
2746                 Y1 = Y0 - boxV;
2747                 gfx_line_fit(im, &X0, &Y0);
2748                 gfx_line_fit(im, &X1, &Y1);
2749                 cairo_move_to(im->cr, X0, Y0);
2750                 cairo_line_to(im->cr, X1, Y0);
2751                 cairo_line_to(im->cr, X1, Y1);
2752                 cairo_line_to(im->cr, X0, Y1);
2753                 cairo_close_path(im->cr);
2754                 cairo_set_source_rgba(im->cr,
2755                                       im->
2756                                       graph_col
2757                                       [GRC_FRAME].
2758                                       red,
2759                                       im->
2760                                       graph_col
2761                                       [GRC_FRAME].
2762                                       green,
2763                                       im->
2764                                       graph_col
2765                                       [GRC_FRAME].
2766                                       blue, im->graph_col[GRC_FRAME].alpha);
2767                 if (im->gdes[i].dash) {
2768                     /* make box borders in legend dashed if the graph is dashed */
2769                     double    dashes[] = {
2770                         3.0
2771                     };
2772                     cairo_set_dash(im->cr, dashes, 1, 0.0);
2773                 }
2774                 cairo_stroke(im->cr);
2775                 cairo_restore(im->cr);
2776             }
2777         }
2778     }
2779 }
2780
2781
2782 /*****************************************************
2783  * lazy check make sure we rely need to create this graph
2784  *****************************************************/
2785
2786 int lazy_check(
2787     image_desc_t *im)
2788 {
2789     FILE     *fd = NULL;
2790     int       size = 1;
2791     struct stat imgstat;
2792
2793     if (im->lazy == 0)
2794         return 0;       /* no lazy option */
2795     if (strlen(im->graphfile) == 0)
2796         return 0;       /* inmemory option */
2797     if (stat(im->graphfile, &imgstat) != 0)
2798         return 0;       /* can't stat */
2799     /* one pixel in the existing graph is more then what we would
2800        change here ... */
2801     if (time(NULL) - imgstat.st_mtime > (im->end - im->start) / im->xsize)
2802         return 0;
2803     if ((fd = fopen(im->graphfile, "rb")) == NULL)
2804         return 0;       /* the file does not exist */
2805     switch (im->imgformat) {
2806     case IF_PNG:
2807         size = PngSize(fd, &(im->ximg), &(im->yimg));
2808         break;
2809     default:
2810         size = 1;
2811     }
2812     fclose(fd);
2813     return size;
2814 }
2815
2816
2817 int graph_size_location(
2818     image_desc_t
2819     *im,
2820     int elements)
2821 {
2822     /* The actual size of the image to draw is determined from
2823      ** several sources.  The size given on the command line is
2824      ** the graph area but we need more as we have to draw labels
2825      ** and other things outside the graph area. If the option 
2826      ** --full-size-mode is selected the size defines the total 
2827      ** image size and the size available for the graph is 
2828      ** calculated.
2829      */
2830
2831     /** +---+-----------------------------------+
2832      ** | y |...............graph title.........|
2833      ** |   +---+-------------------------------+
2834      ** | a | y |                               |
2835      ** | x |   |                               |
2836      ** | i | a |                               |    
2837      ** | s | x |       main graph area         |
2838      ** |   | i |                               |
2839      ** | t | s |                               |
2840      ** | i |   |                               |
2841      ** | t | l |                               |
2842      ** | l | b +-------------------------------+
2843      ** | e | l |       x axis labels           |
2844      ** +---+---+-------------------------------+
2845      ** |....................legends............|
2846      ** +---------------------------------------+
2847      ** |                   watermark           |
2848      ** +---------------------------------------+
2849      */
2850
2851     int       Xvertical = 0, Xvertical2 = 0, Ytitle =
2852         0, Xylabel = 0, Xmain = 0, Ymain =
2853         0, Yxlabel = 0, Xspacing = 15, Yspacing = 15, Ywatermark = 4;
2854
2855     // no legends and no the shall be plotted it's easy
2856     if (im->extra_flags & ONLY_GRAPH) {
2857         im->xorigin = 0;
2858         im->ximg = im->xsize;
2859         im->yimg = im->ysize;
2860         im->yorigin = im->ysize;
2861         ytr(im, DNAN);
2862         return 0;
2863     }
2864
2865     if(im->watermark[0] != '\0') {
2866         Ywatermark = im->text_prop[TEXT_PROP_WATERMARK].size * 2;
2867     }
2868
2869     // calculate the width of the left vertical legend
2870     if (im->ylegend[0] != '\0') {
2871         Xvertical = im->text_prop[TEXT_PROP_UNIT].size * 2;
2872     }
2873
2874     // calculate the width of the right vertical legend
2875     if (im->second_axis_legend[0] != '\0') {
2876         Xvertical2 = im->text_prop[TEXT_PROP_UNIT].size * 2;
2877     }
2878     else{
2879         Xvertical2 = Xspacing;
2880     }
2881
2882     if (im->title[0] != '\0') {
2883         /* The title is placed "inbetween" two text lines so it
2884          ** automatically has some vertical spacing.  The horizontal
2885          ** spacing is added here, on each side.
2886          */
2887         /* if necessary, reduce the font size of the title until it fits the image width */
2888         Ytitle = im->text_prop[TEXT_PROP_TITLE].size * 2.6 + 10;
2889     }
2890     else{
2891         // we have no title; get a little clearing from the top
2892         Ytitle = 1.5 * Yspacing;
2893     }
2894
2895     if (elements) {
2896         if (im->draw_x_grid) {
2897             // calculate the height of the horizontal labelling
2898             Yxlabel = im->text_prop[TEXT_PROP_AXIS].size * 2.5;
2899         }
2900         if (im->draw_y_grid || im->forceleftspace) {
2901             // calculate the width of the vertical labelling
2902             Xylabel =
2903                 gfx_get_text_width(im, 0,
2904                                    im->text_prop[TEXT_PROP_AXIS].font_desc,
2905                                    im->tabwidth, "0") * im->unitslength;
2906         }
2907     }
2908
2909     // add some space to the labelling
2910     Xylabel += Xspacing;
2911
2912     /* If the legend is printed besides the graph the width has to be
2913      ** calculated first. Placing the legend north or south of the 
2914      ** graph requires the width calculation first, so the legend is 
2915      ** skipped for the moment.
2916      */
2917     im->legendheight = 0;
2918     im->legendwidth = 0;
2919     if (!(im->extra_flags & NOLEGEND)) {
2920         if(im->legendposition == WEST || im->legendposition == EAST){
2921             if (leg_place(im, 1) == -1){
2922                 return -1;
2923             }
2924         }
2925     }
2926
2927     if (im->extra_flags & FULL_SIZE_MODE) {
2928
2929         /* The actual size of the image to draw has been determined by the user.
2930          ** The graph area is the space remaining after accounting for the legend,
2931          ** the watermark, the axis labels, and the title.
2932          */
2933         im->ximg = im->xsize;
2934         im->yimg = im->ysize;
2935         Xmain = im->ximg;
2936         Ymain = im->yimg;
2937
2938         /* Now calculate the total size.  Insert some spacing where
2939            desired.  im->xorigin and im->yorigin need to correspond
2940            with the lower left corner of the main graph area or, if
2941            this one is not set, the imaginary box surrounding the
2942            pie chart area. */
2943         /* Initial size calculation for the main graph area */
2944
2945         Xmain -= Xylabel;// + Xspacing;
2946         if((im->legendposition == WEST || im->legendposition == EAST) && !(im->extra_flags & NOLEGEND) ){
2947             Xmain -= im->legendwidth;// + Xspacing;
2948         }
2949         if (im->second_axis_scale != 0){
2950             Xmain -= Xylabel;
2951         }
2952         if (!(im->extra_flags & NO_RRDTOOL_TAG)){
2953             Xmain -= Xspacing;
2954         }
2955
2956         Xmain -= Xvertical + Xvertical2;
2957
2958         /* limit the remaining space to 0 */
2959         if(Xmain < 1){
2960             Xmain = 1;
2961         }
2962         im->xsize = Xmain;
2963
2964         /* Putting the legend north or south, the height can now be calculated */
2965         if (!(im->extra_flags & NOLEGEND)) {
2966             if(im->legendposition == NORTH || im->legendposition == SOUTH){
2967                 im->legendwidth = im->ximg;
2968                 if (leg_place(im, 0) == -1){
2969                     return -1;
2970                 }
2971             }
2972         }
2973
2974         if( (im->legendposition == NORTH || im->legendposition == SOUTH)  && !(im->extra_flags & NOLEGEND) ){
2975             Ymain -=  Yxlabel + im->legendheight;
2976         }
2977         else{
2978             Ymain -= Yxlabel;
2979         }
2980         
2981         /* reserve space for the title *or* some padding above the graph */
2982         Ymain -= Ytitle;
2983
2984             /* reserve space for padding below the graph */
2985         if (im->extra_flags & NOLEGEND) {
2986             Ymain -= Yspacing;
2987         }
2988
2989         if (im->watermark[0] != '\0') {
2990             Ymain -= Ywatermark;
2991         }
2992         /* limit the remaining height to 0 */
2993         if(Ymain < 1){
2994             Ymain = 1;
2995         }
2996         im->ysize = Ymain;
2997     } else {            /* dimension options -width and -height refer to the dimensions of the main graph area */
2998
2999         /* The actual size of the image to draw is determined from
3000          ** several sources.  The size given on the command line is
3001          ** the graph area but we need more as we have to draw labels
3002          ** and other things outside the graph area.
3003          */
3004
3005         if (elements) {
3006             Xmain = im->xsize; // + Xspacing;
3007             Ymain = im->ysize;
3008         }
3009
3010         im->ximg = Xmain + Xylabel;
3011         if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3012             im->ximg += Xspacing;
3013         }
3014
3015         if( (im->legendposition == WEST || im->legendposition == EAST) && !(im->extra_flags & NOLEGEND) ){
3016             im->ximg += im->legendwidth;// + Xspacing;
3017         }
3018         if (im->second_axis_scale != 0){
3019             im->ximg += Xylabel;
3020         }
3021
3022         im->ximg += Xvertical + Xvertical2;
3023
3024         if (!(im->extra_flags & NOLEGEND)) {
3025             if(im->legendposition == NORTH || im->legendposition == SOUTH){
3026                 im->legendwidth = im->ximg;
3027                 if (leg_place(im, 0) == -1){
3028                     return -1;
3029                 }
3030             }
3031         }
3032       
3033         im->yimg = Ymain + Yxlabel;
3034         if( (im->legendposition == NORTH || im->legendposition == SOUTH)  && !(im->extra_flags & NOLEGEND) ){
3035              im->yimg += im->legendheight;
3036         }
3037         
3038         /* reserve space for the title *or* some padding above the graph */
3039         if (Ytitle) {
3040             im->yimg += Ytitle;
3041         } else {
3042             im->yimg += 1.5 * Yspacing;
3043         }
3044         /* reserve space for padding below the graph */
3045         if (im->extra_flags & NOLEGEND) {
3046             im->yimg += Yspacing;
3047         }
3048
3049         if (im->watermark[0] != '\0') {
3050             im->yimg += Ywatermark;
3051         }
3052     }
3053
3054
3055     /* In case of putting the legend in west or east position the first 
3056      ** legend calculation might lead to wrong positions if some items 
3057      ** are not aligned on the left hand side (e.g. centered) as the 
3058      ** legendwidth wight have been increased after the item was placed.
3059      ** In this case the positions have to be recalculated.
3060      */
3061     if (!(im->extra_flags & NOLEGEND)) {
3062         if(im->legendposition == WEST || im->legendposition == EAST){
3063             if (leg_place(im, 0) == -1){
3064                 return -1;
3065             }
3066         }
3067     }
3068
3069     /* After calculating all dimensions
3070      ** it is now possible to calculate 
3071      ** all offsets.
3072      */
3073     switch(im->legendposition){
3074         case NORTH:
3075             im->xOriginTitle   = Xvertical + Xylabel + (im->xsize / 2);
3076             im->yOriginTitle   = 0;
3077
3078             im->xOriginLegend  = 0;
3079             im->yOriginLegend  = Ytitle;
3080
3081             im->xOriginLegendY = 0;
3082             im->yOriginLegendY = Ytitle + im->legendheight + (Ymain / 2) + Yxlabel;
3083
3084             im->xorigin        = Xvertical + Xylabel;
3085             im->yorigin        = Ytitle + im->legendheight + Ymain;
3086
3087             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3088             if (im->second_axis_scale != 0){
3089                 im->xOriginLegendY2 += Xylabel;
3090             }
3091             im->yOriginLegendY2 = Ytitle + im->legendheight + (Ymain / 2) + Yxlabel;
3092
3093             break;
3094
3095         case WEST:
3096             im->xOriginTitle   = im->legendwidth + Xvertical + Xylabel + im->xsize / 2;
3097             im->yOriginTitle   = 0;
3098
3099             im->xOriginLegend  = 0;
3100             im->yOriginLegend  = Ytitle;
3101
3102             im->xOriginLegendY = im->legendwidth;
3103             im->yOriginLegendY = Ytitle + (Ymain / 2);
3104
3105             im->xorigin        = im->legendwidth + Xvertical + Xylabel;
3106             im->yorigin        = Ytitle + Ymain;
3107
3108             im->xOriginLegendY2 = im->legendwidth + Xvertical + Xylabel + Xmain;
3109             if (im->second_axis_scale != 0){
3110                 im->xOriginLegendY2 += Xylabel;
3111             }
3112             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3113
3114             break;
3115
3116         case SOUTH:
3117             im->xOriginTitle   = Xvertical + Xylabel + im->xsize / 2;
3118             im->yOriginTitle   = 0;
3119
3120             im->xOriginLegend  = 0;
3121             im->yOriginLegend  = Ytitle + Ymain + Yxlabel;
3122
3123             im->xOriginLegendY = 0;
3124             im->yOriginLegendY = Ytitle + (Ymain / 2);
3125
3126             im->xorigin        = Xvertical + Xylabel;
3127             im->yorigin        = Ytitle + Ymain;
3128
3129             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3130             if (im->second_axis_scale != 0){
3131                 im->xOriginLegendY2 += Xylabel;
3132             }
3133             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3134
3135             break;
3136
3137         case EAST:
3138             im->xOriginTitle   = Xvertical + Xylabel + im->xsize / 2;
3139             im->yOriginTitle   = 0;
3140
3141             im->xOriginLegend  = Xvertical + Xylabel + Xmain + Xvertical2;
3142             if (im->second_axis_scale != 0){
3143                 im->xOriginLegend += Xylabel;
3144             }
3145             im->yOriginLegend  = Ytitle;
3146
3147             im->xOriginLegendY = 0;
3148             im->yOriginLegendY = Ytitle + (Ymain / 2);
3149
3150             im->xorigin        = Xvertical + Xylabel;
3151             im->yorigin        = Ytitle + Ymain;
3152
3153             im->xOriginLegendY2 = Xvertical + Xylabel + Xmain;
3154             if (im->second_axis_scale != 0){
3155                 im->xOriginLegendY2 += Xylabel;
3156             }
3157             im->yOriginLegendY2 = Ytitle + (Ymain / 2);
3158
3159             if (!(im->extra_flags & NO_RRDTOOL_TAG)){
3160                 im->xOriginTitle    += Xspacing;
3161                 im->xOriginLegend   += Xspacing;
3162                 im->xOriginLegendY  += Xspacing;
3163                 im->xorigin         += Xspacing;
3164                 im->xOriginLegendY2 += Xspacing;
3165             }
3166             break;
3167     }
3168
3169     xtr(im, 0);
3170     ytr(im, DNAN);
3171     return 0;
3172 }
3173
3174 static cairo_status_t cairo_output(
3175     void *closure,
3176     const unsigned char
3177     *data,
3178     unsigned int length)
3179 {
3180     image_desc_t *im = (image_desc_t*)closure;
3181
3182     im->rendered_image =
3183         (unsigned char*)realloc(im->rendered_image, im->rendered_image_size + length);
3184     if (im->rendered_image == NULL)
3185         return CAIRO_STATUS_WRITE_ERROR;
3186     memcpy(im->rendered_image + im->rendered_image_size, data, length);
3187     im->rendered_image_size += length;
3188     return CAIRO_STATUS_SUCCESS;
3189 }
3190
3191 /* draw that picture thing ... */
3192 int graph_paint(
3193     image_desc_t *im)
3194 {
3195     int       i, ii;
3196     int       lazy = lazy_check(im);
3197     double    areazero = 0.0;
3198     graph_desc_t *lastgdes = NULL;
3199     rrd_infoval_t info;
3200
3201 //    PangoFontMap *font_map = pango_cairo_font_map_get_default();
3202
3203     /* pull the data from the rrd files ... */
3204     if (data_fetch(im) == -1)
3205         return -1;
3206     /* evaluate VDEF and CDEF operations ... */
3207     if (data_calc(im) == -1)
3208         return -1;
3209     /* calculate and PRINT and GPRINT definitions. We have to do it at
3210      * this point because it will affect the length of the legends
3211      * if there are no graph elements (i==0) we stop here ... 
3212      * if we are lazy, try to quit ... 
3213      */
3214     i = print_calc(im);
3215     if (i < 0)
3216         return -1;
3217
3218     /* if we want and can be lazy ... quit now */
3219     if (i == 0)
3220         return 0;
3221
3222 /**************************************************************
3223  *** Calculating sizes and locations became a bit confusing ***
3224  *** so I moved this into a separate function.              ***
3225  **************************************************************/
3226     if (graph_size_location(im, i) == -1)
3227         return -1;
3228
3229     info.u_cnt = im->xorigin;
3230     grinfo_push(im, sprintf_alloc("graph_left"), RD_I_CNT, info);
3231     info.u_cnt = im->yorigin - im->ysize;
3232     grinfo_push(im, sprintf_alloc("graph_top"), RD_I_CNT, info);
3233     info.u_cnt = im->xsize;
3234     grinfo_push(im, sprintf_alloc("graph_width"), RD_I_CNT, info);
3235     info.u_cnt = im->ysize;
3236     grinfo_push(im, sprintf_alloc("graph_height"), RD_I_CNT, info);
3237     info.u_cnt = im->ximg;
3238     grinfo_push(im, sprintf_alloc("image_width"), RD_I_CNT, info);
3239     info.u_cnt = im->yimg;
3240     grinfo_push(im, sprintf_alloc("image_height"), RD_I_CNT, info);
3241     info.u_cnt = im->start;
3242     grinfo_push(im, sprintf_alloc("graph_start"), RD_I_CNT, info);
3243     info.u_cnt = im->end;
3244     grinfo_push(im, sprintf_alloc("graph_end"), RD_I_CNT, info);
3245
3246     /* if we want and can be lazy ... quit now */
3247     if (lazy)
3248         return 0;
3249
3250     /* get actual drawing data and find min and max values */
3251     if (data_proc(im) == -1)
3252         return -1;
3253     if (!im->logarithmic) {
3254         si_unit(im);
3255     }
3256
3257     /* identify si magnitude Kilo, Mega Giga ? */
3258     if (!im->rigid && !im->logarithmic)
3259         expand_range(im);   /* make sure the upper and lower limit are
3260                                sensible values */
3261
3262     info.u_val = im->minval;
3263     grinfo_push(im, sprintf_alloc("value_min"), RD_I_VAL, info);
3264     info.u_val = im->maxval;
3265     grinfo_push(im, sprintf_alloc("value_max"), RD_I_VAL, info);
3266
3267
3268     if (!calc_horizontal_grid(im))
3269         return -1;
3270     /* reset precalc */
3271     ytr(im, DNAN);
3272 /*   if (im->gridfit)
3273      apply_gridfit(im); */
3274     /* the actual graph is created by going through the individual
3275        graph elements and then drawing them */
3276     cairo_surface_destroy(im->surface);
3277     switch (im->imgformat) {
3278     case IF_PNG:
3279         im->surface =
3280             cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
3281                                        im->ximg * im->zoom,
3282                                        im->yimg * im->zoom);
3283         break;
3284     case IF_PDF:
3285         im->gridfit = 0;
3286         im->surface = strlen(im->graphfile)
3287             ? cairo_pdf_surface_create(im->graphfile, im->ximg * im->zoom,
3288                                        im->yimg * im->zoom)
3289             : cairo_pdf_surface_create_for_stream
3290             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3291         break;
3292     case IF_EPS:
3293         im->gridfit = 0;
3294         im->surface = strlen(im->graphfile)
3295             ?
3296             cairo_ps_surface_create(im->graphfile, im->ximg * im->zoom,
3297                                     im->yimg * im->zoom)
3298             : cairo_ps_surface_create_for_stream
3299             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3300         break;
3301     case IF_SVG:
3302         im->gridfit = 0;
3303         im->surface = strlen(im->graphfile)
3304             ?
3305             cairo_svg_surface_create(im->
3306                                      graphfile,
3307                                      im->ximg * im->zoom, im->yimg * im->zoom)
3308             : cairo_svg_surface_create_for_stream
3309             (&cairo_output, im, im->ximg * im->zoom, im->yimg * im->zoom);
3310         cairo_svg_surface_restrict_to_version
3311             (im->surface, CAIRO_SVG_VERSION_1_1);
3312         break;
3313     };
3314     cairo_destroy(im->cr);
3315     im->cr = cairo_create(im->surface);
3316     cairo_set_antialias(im->cr, im->graph_antialias);
3317     cairo_scale(im->cr, im->zoom, im->zoom);
3318 //    pango_cairo_font_map_set_resolution(PANGO_CAIRO_FONT_MAP(font_map), 100);
3319     gfx_new_area(im, 0, 0, 0, im->yimg,
3320                  im->ximg, im->yimg, im->graph_col[GRC_BACK]);
3321     gfx_add_point(im, im->ximg, 0);
3322     gfx_close_path(im);
3323     gfx_new_area(im, im->xorigin,
3324                  im->yorigin,
3325                  im->xorigin +
3326                  im->xsize, im->yorigin,
3327                  im->xorigin +
3328                  im->xsize,
3329                  im->yorigin - im->ysize, im->graph_col[GRC_CANVAS]);
3330     gfx_add_point(im, im->xorigin, im->yorigin - im->ysize);
3331     gfx_close_path(im);
3332     cairo_rectangle(im->cr, im->xorigin, im->yorigin - im->ysize - 1.0,
3333                     im->xsize, im->ysize + 2.0);
3334     cairo_clip(im->cr);
3335     if (im->minval > 0.0)
3336         areazero = im->minval;
3337     if (im->maxval < 0.0)
3338         areazero = im->maxval;
3339     for (i = 0; i < im->gdes_c; i++) {
3340         switch (im->gdes[i].gf) {
3341         case GF_CDEF:
3342         case GF_VDEF:
3343         case GF_DEF:
3344         case GF_PRINT:
3345         case GF_GPRINT:
3346         case GF_COMMENT:
3347         case GF_TEXTALIGN:
3348         case GF_HRULE:
3349         case GF_VRULE:
3350         case GF_XPORT:
3351         case GF_SHIFT:
3352             break;
3353         case GF_TICK:
3354             for (ii = 0; ii < im->xsize; ii++) {
3355                 if (!isnan(im->gdes[i].p_data[ii])
3356                     && im->gdes[i].p_data[ii] != 0.0) {
3357                     if (im->gdes[i].yrule > 0) {
3358                         gfx_line(im,
3359                                  im->xorigin + ii,
3360                                  im->yorigin + 1.0,
3361                                  im->xorigin + ii,
3362                                  im->yorigin -
3363                                  im->gdes[i].yrule *
3364                                  im->ysize, 1.0, im->gdes[i].col);
3365                     } else if (im->gdes[i].yrule < 0) {
3366                         gfx_line(im,
3367                                  im->xorigin + ii,
3368                                  im->yorigin - im->ysize - 1.0,
3369                                  im->xorigin + ii,
3370                                  im->yorigin - im->ysize -
3371                                                 im->gdes[i].
3372                                                 yrule *
3373                                  im->ysize, 1.0, im->gdes[i].col);
3374                     }
3375                 }
3376             }
3377             break;
3378         case GF_LINE:
3379         case GF_AREA:
3380             /* fix data points at oo and -oo */
3381             for (ii = 0; ii < im->xsize; ii++) {
3382                 if (isinf(im->gdes[i].p_data[ii])) {
3383                     if (im->gdes[i].p_data[ii] > 0) {
3384                         im->gdes[i].p_data[ii] = im->maxval;
3385                     } else {
3386                         im->gdes[i].p_data[ii] = im->minval;
3387                     }
3388
3389                 }
3390             }           /* for */
3391
3392             /* *******************************************************
3393                a           ___. (a,t) 
3394                |   |    ___
3395                ____|   |   |   |
3396                |       |___|
3397                -------|--t-1--t--------------------------------      
3398
3399                if we know the value at time t was a then 
3400                we draw a square from t-1 to t with the value a.
3401
3402                ********************************************************* */
3403             if (im->gdes[i].col.alpha != 0.0) {
3404                 /* GF_LINE and friend */
3405                 if (im->gdes[i].gf == GF_LINE) {
3406                     double    last_y = 0.0;
3407                     int       draw_on = 0;
3408
3409                     cairo_save(im->cr);
3410                     cairo_new_path(im->cr);
3411                     cairo_set_line_width(im->cr, im->gdes[i].linewidth);
3412                     if (im->gdes[i].dash) {
3413                         cairo_set_dash(im->cr,
3414                                        im->gdes[i].p_dashes,
3415                                        im->gdes[i].ndash, im->gdes[i].offset);
3416                     }
3417
3418                     for (ii = 1; ii < im->xsize; ii++) {
3419                         if (isnan(im->gdes[i].p_data[ii])
3420                             || (im->slopemode == 1
3421                                 && isnan(im->gdes[i].p_data[ii - 1]))) {
3422                             draw_on = 0;
3423                             continue;
3424                         }
3425                         if (draw_on == 0) {
3426                             last_y = ytr(im, im->gdes[i].p_data[ii]);
3427                             if (im->slopemode == 0) {
3428                                 double    x = ii - 1 + im->xorigin;
3429                                 double    y = last_y;
3430
3431                                 gfx_line_fit(im, &x, &y);
3432                                 cairo_move_to(im->cr, x, y);
3433                                 x = ii + im->xorigin;
3434                                 y = last_y;
3435                                 gfx_line_fit(im, &x, &y);
3436                                 cairo_line_to(im->cr, x, y);
3437                             } else {
3438                                 double    x = ii - 1 + im->xorigin;
3439                                 double    y =
3440                                     ytr(im, im->gdes[i].p_data[ii - 1]);
3441                                 gfx_line_fit(im, &x, &y);
3442                                 cairo_move_to(im->cr, x, y);
3443                                 x = ii + im->xorigin;
3444                                 y = last_y;
3445                                 gfx_line_fit(im, &x, &y);
3446                                 cairo_line_to(im->cr, x, y);
3447                             }
3448                             draw_on = 1;
3449                         } else {
3450                             double    x1 = ii + im->xorigin;
3451                             double    y1 = ytr(im, im->gdes[i].p_data[ii]);
3452
3453                             if (im->slopemode == 0
3454                                 && !AlmostEqual2sComplement(y1, last_y, 4)) {
3455                                 double    x = ii - 1 + im->xorigin;
3456                                 double    y = y1;
3457
3458                                 gfx_line_fit(im, &x, &y);
3459                                 cairo_line_to(im->cr, x, y);
3460                             };
3461                             last_y = y1;
3462                             gfx_line_fit(im, &x1, &y1);
3463                             cairo_line_to(im->cr, x1, y1);
3464                         };
3465                     }
3466                     cairo_set_source_rgba(im->cr,
3467                                           im->gdes[i].
3468                                           col.red,
3469                                           im->gdes[i].
3470                                           col.green,
3471                                           im->gdes[i].
3472                                           col.blue, im->gdes[i].col.alpha);
3473                     cairo_set_line_cap(im->cr, CAIRO_LINE_CAP_ROUND);
3474                     cairo_set_line_join(im->cr, CAIRO_LINE_JOIN_ROUND);
3475                     cairo_stroke(im->cr);
3476                     cairo_restore(im->cr);
3477                 } else {
3478                     int       idxI = -1;
3479                     double   *foreY =
3480                         (double *) malloc(sizeof(double) * im->xsize * 2);
3481                     double   *foreX =
3482                         (double *) malloc(sizeof(double) * im->xsize * 2);
3483                     double   *backY =
3484                         (double *) malloc(sizeof(double) * im->xsize * 2);
3485                     double   *backX =
3486                         (double *) malloc(sizeof(double) * im->xsize * 2);
3487                     int       drawem = 0;
3488
3489                     for (ii = 0; ii <= im->xsize; ii++) {
3490                         double    ybase, ytop;
3491
3492                         if (idxI > 0 && (drawem != 0 || ii == im->xsize)) {
3493                             int       cntI = 1;
3494                             int       lastI = 0;
3495
3496                             while (cntI < idxI
3497                                    &&
3498                                    AlmostEqual2sComplement(foreY
3499                                                            [lastI],
3500                                                            foreY[cntI], 4)
3501                                    &&
3502                                    AlmostEqual2sComplement(foreY
3503                                                            [lastI],
3504                                                            foreY
3505                                                            [cntI + 1], 4)) {
3506                                 cntI++;
3507                             }
3508                             gfx_new_area(im,
3509                                          backX[0], backY[0],
3510                                          foreX[0], foreY[0],
3511                                          foreX[cntI],
3512                                          foreY[cntI], im->gdes[i].col);
3513                             while (cntI < idxI) {
3514                                 lastI = cntI;
3515                                 cntI++;
3516                                 while (cntI < idxI
3517                                        &&
3518                                        AlmostEqual2sComplement(foreY
3519                                                                [lastI],
3520                                                                foreY[cntI], 4)
3521                                        &&
3522                                        AlmostEqual2sComplement(foreY
3523                                                                [lastI],
3524                                                                foreY
3525                                                                [cntI
3526                                                                 + 1], 4)) {
3527                                     cntI++;
3528                                 }
3529                                 gfx_add_point(im, foreX[cntI], foreY[cntI]);
3530                             }
3531                             gfx_add_point(im, backX[idxI], backY[idxI]);
3532                             while (idxI > 1) {
3533                                 lastI = idxI;
3534                                 idxI--;
3535                                 while (idxI > 1
3536                                        &&
3537                                        AlmostEqual2sComplement(backY
3538                                                                [lastI],
3539                                                                backY[idxI], 4)
3540                                        &&
3541                                        AlmostEqual2sComplement(backY
3542                                                                [lastI],
3543                                                                backY
3544                                                                [idxI
3545                                                                 - 1], 4)) {
3546                                     idxI--;
3547                                 }
3548                                 gfx_add_point(im, backX[idxI], backY[idxI]);
3549                             }
3550                             idxI = -1;
3551                             drawem = 0;
3552                             gfx_close_path(im);
3553                         }
3554                         if (drawem != 0) {
3555                             drawem = 0;
3556                             idxI = -1;
3557                         }
3558                         if (ii == im->xsize)
3559                             break;
3560                         if (im->slopemode == 0 && ii == 0) {
3561                             continue;
3562                         }
3563                         if (isnan(im->gdes[i].p_data[ii])) {
3564                             drawem = 1;
3565                             continue;
3566                         }
3567                         ytop = ytr(im, im->gdes[i].p_data[ii]);
3568                         if (lastgdes && im->gdes[i].stack) {
3569                             ybase = ytr(im, lastgdes->p_data[ii]);
3570                         } else {
3571                             ybase = ytr(im, areazero);
3572                         }
3573                         if (ybase == ytop) {
3574                             drawem = 1;
3575                             continue;
3576                         }
3577
3578                         if (ybase > ytop) {
3579                             double    extra = ytop;
3580
3581                             ytop = ybase;
3582                             ybase = extra;
3583                         }
3584                         if (im->slopemode == 0) {
3585                             backY[++idxI] = ybase - 0.2;
3586                             backX[idxI] = ii + im->xorigin - 1;
3587                             foreY[idxI] = ytop + 0.2;
3588                             foreX[idxI] = ii + im->xorigin - 1;
3589                         }
3590                         backY[++idxI] = ybase - 0.2;
3591                         backX[idxI] = ii + im->xorigin;
3592                         foreY[idxI] = ytop + 0.2;
3593                         foreX[idxI] = ii + im->xorigin;
3594                     }
3595                     /* close up any remaining area */
3596                     free(foreY);
3597                     free(foreX);
3598                     free(backY);
3599                     free(backX);
3600                 }       /* else GF_LINE */
3601             }
3602             /* if color != 0x0 */
3603             /* make sure we do not run into trouble when stacking on NaN */
3604             for (ii = 0; ii < im->xsize; ii++) {
3605                 if (isnan(im->gdes[i].p_data[ii])) {
3606                     if (lastgdes && (im->gdes[i].stack)) {
3607                         im->gdes[i].p_data[ii] = lastgdes->p_data[ii];
3608                     } else {
3609                         im->gdes[i].p_data[ii] = areazero;
3610                     }
3611                 }
3612             }
3613             lastgdes = &(im->gdes[i]);
3614             break;
3615         case GF_STACK:
3616             rrd_set_error
3617                 ("STACK should already be turned into LINE or AREA here");
3618             return -1;
3619             break;
3620         }               /* switch */
3621     }
3622     cairo_reset_clip(im->cr);
3623
3624     /* grid_paint also does the text */
3625     if (!(im->extra_flags & ONLY_GRAPH))
3626         grid_paint(im);
3627     if (!(im->extra_flags & ONLY_GRAPH))
3628         axis_paint(im);
3629     /* the RULES are the last thing to paint ... */
3630     for (i = 0; i < im->gdes_c; i++) {
3631
3632         switch (im->gdes[i].gf) {
3633         case GF_HRULE:
3634             if (im->gdes[i].yrule >= im->minval
3635                 && im->gdes[i].yrule <= im->maxval) {
3636                 cairo_save(im->cr);
3637                 if (im->gdes[i].dash) {
3638                     cairo_set_dash(im->cr,
3639                                    im->gdes[i].p_dashes,
3640                                    im->gdes[i].ndash, im->gdes[i].offset);
3641                 }
3642                 gfx_line(im, im->xorigin,
3643                          ytr(im, im->gdes[i].yrule),
3644                          im->xorigin + im->xsize,
3645                          ytr(im, im->gdes[i].yrule), 1.0, im->gdes[i].col);
3646                 cairo_stroke(im->cr);
3647                 cairo_restore(im->cr);
3648             }
3649             break;
3650         case GF_VRULE:
3651             if (im->gdes[i].xrule >= im->start
3652                 && im->gdes[i].xrule <= im->end) {
3653                 cairo_save(im->cr);
3654                 if (im->gdes[i].dash) {
3655                     cairo_set_dash(im->cr,
3656                                    im->gdes[i].p_dashes,
3657                                    im->gdes[i].ndash, im->gdes[i].offset);
3658                 }
3659                 gfx_line(im,
3660                          xtr(im, im->gdes[i].xrule),
3661                          im->yorigin, xtr(im,
3662                                           im->
3663                                           gdes[i].
3664                                           xrule),
3665                          im->yorigin - im->ysize, 1.0, im->gdes[i].col);
3666                 cairo_stroke(im->cr);
3667                 cairo_restore(im->cr);
3668             }
3669             break;
3670         default:
3671             break;
3672         }
3673     }
3674
3675
3676     switch (im->imgformat) {
3677     case IF_PNG:
3678     {
3679         cairo_status_t status;
3680
3681         status = strlen(im->graphfile) ?
3682             cairo_surface_write_to_png(im->surface, im->graphfile)
3683             : cairo_surface_write_to_png_stream(im->surface, &cairo_output,
3684                                                 im);
3685
3686         if (status != CAIRO_STATUS_SUCCESS) {
3687             rrd_set_error("Could not save png to '%s'", im->graphfile);
3688             return 1;
3689         }
3690         break;
3691     }
3692     default:
3693         if (strlen(im->graphfile)) {
3694             cairo_show_page(im->cr);
3695         } else {
3696             cairo_surface_finish(im->surface);
3697         }
3698         break;
3699     }
3700
3701     return 0;
3702 }
3703
3704
3705 /*****************************************************
3706  * graph stuff 
3707  *****************************************************/
3708
3709 int gdes_alloc(
3710     image_desc_t *im)
3711 {
3712
3713     im->gdes_c++;
3714     if ((im->gdes = (graph_desc_t *)
3715          rrd_realloc(im->gdes, (im->gdes_c)
3716                      * sizeof(graph_desc_t))) == NULL) {
3717         rrd_set_error("realloc graph_descs");
3718         return -1;
3719     }
3720
3721
3722     im->gdes[im->gdes_c - 1].step = im->step;
3723     im->gdes[im->gdes_c - 1].step_orig = im->step;
3724     im->gdes[im->gdes_c - 1].stack = 0;
3725     im->gdes[im->gdes_c - 1].linewidth = 0;
3726     im->gdes[im->gdes_c - 1].debug = 0;
3727     im->gdes[im->gdes_c - 1].start = im->start;
3728     im->gdes[im->gdes_c - 1].start_orig = im->start;
3729     im->gdes[im->gdes_c - 1].end = im->end;
3730     im->gdes[im->gdes_c - 1].end_orig = im->end;
3731     im->gdes[im->gdes_c - 1].vname[0] = '\0';
3732     im->gdes[im->gdes_c - 1].data = NULL;
3733     im->gdes[im->gdes_c - 1].ds_namv = NULL;
3734     im->gdes[im->gdes_c - 1].data_first = 0;
3735     im->gdes[im->gdes_c - 1].p_data = NULL;
3736     im->gdes[im->gdes_c - 1].rpnp = NULL;
3737     im->gdes[im->gdes_c - 1].p_dashes = NULL;
3738     im->gdes[im->gdes_c - 1].shift = 0.0;
3739     im->gdes[im->gdes_c - 1].dash = 0;
3740     im->gdes[im->gdes_c - 1].ndash = 0;
3741     im->gdes[im->gdes_c - 1].offset = 0;
3742     im->gdes[im->gdes_c - 1].col.red = 0.0;
3743     im->gdes[im->gdes_c - 1].col.green = 0.0;
3744     im->gdes[im->gdes_c - 1].col.blue = 0.0;
3745     im->gdes[im->gdes_c - 1].col.alpha = 0.0;
3746     im->gdes[im->gdes_c - 1].legend[0] = '\0';
3747     im->gdes[im->gdes_c - 1].format[0] = '\0';
3748     im->gdes[im->gdes_c - 1].strftm = 0;
3749     im->gdes[im->gdes_c - 1].rrd[0] = '\0';
3750     im->gdes[im->gdes_c - 1].ds = -1;
3751     im->gdes[im->gdes_c - 1].cf_reduce = CF_AVERAGE;
3752     im->gdes[im->gdes_c - 1].cf = CF_AVERAGE;
3753     im->gdes[im->gdes_c - 1].yrule = DNAN;
3754     im->gdes[im->gdes_c - 1].xrule = 0;
3755     return 0;
3756 }
3757
3758 /* copies input untill the first unescaped colon is found
3759    or until input ends. backslashes have to be escaped as well */
3760 int scan_for_col(
3761     const char *const input,
3762     int len,
3763     char *const output)
3764 {
3765     int       inp, outp = 0;
3766
3767     for (inp = 0; inp < len && input[inp] != ':' && input[inp] != '\0'; inp++) {
3768         if (input[inp] == '\\'
3769             && input[inp + 1] != '\0'
3770             && (input[inp + 1] == '\\' || input[inp + 1] == ':')) {
3771             output[outp++] = input[++inp];
3772         } else {
3773             output[outp++] = input[inp];
3774         }
3775     }
3776     output[outp] = '\0';
3777     return inp;
3778 }
3779
3780 /* Now just a wrapper around rrd_graph_v */
3781 int rrd_graph(
3782     int argc,
3783     char **argv,
3784     char ***prdata,
3785     int *xsize,
3786     int *ysize,
3787     FILE * stream,
3788     double *ymin,
3789     double *ymax)
3790 {
3791     int       prlines = 0;
3792     rrd_info_t *grinfo = NULL;
3793     rrd_info_t *walker;
3794
3795     grinfo = rrd_graph_v(argc, argv);
3796     if (grinfo == NULL)
3797         return -1;
3798     walker = grinfo;
3799     (*prdata) = NULL;
3800     while (walker) {
3801         if (strcmp(walker->key, "image_info") == 0) {
3802             prlines++;
3803             if (((*prdata) =
3804                  (char**)rrd_realloc((*prdata),
3805                              (prlines + 1) * sizeof(char *))) == NULL) {
3806                 rrd_set_error("realloc prdata");
3807                 return 0;
3808             }
3809             /* imginfo goes to position 0 in the prdata array */
3810             (*prdata)[prlines - 1] = (char*)malloc((strlen(walker->value.u_str)
3811                                              + 2) * sizeof(char));
3812             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3813             (*prdata)[prlines] = NULL;
3814         }
3815         /* skip anything else */
3816         walker = walker->next;
3817     }
3818     walker = grinfo;
3819     *xsize = 0;
3820     *ysize = 0;
3821     *ymin = 0;
3822     *ymax = 0;
3823     while (walker) {
3824         if (strcmp(walker->key, "image_width") == 0) {
3825             *xsize = walker->value.u_cnt;
3826         } else if (strcmp(walker->key, "image_height") == 0) {
3827             *ysize = walker->value.u_cnt;
3828         } else if (strcmp(walker->key, "value_min") == 0) {
3829             *ymin = walker->value.u_val;
3830         } else if (strcmp(walker->key, "value_max") == 0) {
3831             *ymax = walker->value.u_val;
3832         } else if (strncmp(walker->key, "print", 5) == 0) { /* keys are prdate[0..] */
3833             prlines++;
3834             if (((*prdata) =
3835                  (char**)rrd_realloc((*prdata),
3836                              (prlines + 1) * sizeof(char *))) == NULL) {
3837                 rrd_set_error("realloc prdata");
3838                 return 0;
3839             }
3840             (*prdata)[prlines - 1] = (char*)malloc((strlen(walker->value.u_str)
3841                                              + 2) * sizeof(char));
3842             (*prdata)[prlines] = NULL;
3843             strcpy((*prdata)[prlines - 1], walker->value.u_str);
3844         } else if (strcmp(walker->key, "image") == 0) {
3845             if ( fwrite(walker->value.u_blo.ptr, walker->value.u_blo.size, 1,
3846                    (stream ? stream : stdout)) == 0 && ferror(stream ? stream : stdout)){
3847                 rrd_set_error("writing image");
3848                 return 0;
3849             }
3850         }
3851         /* skip anything else */
3852         walker = walker->next;
3853     }
3854     rrd_info_free(grinfo);
3855     return 0;
3856 }
3857
3858
3859 /* Some surgery done on this function, it became ridiculously big.
3860 ** Things moved:
3861 ** - initializing     now in rrd_graph_init()
3862 ** - options parsing  now in rrd_graph_options()
3863 ** - script parsing   now in rrd_graph_script()
3864 */
3865 rrd_info_t *rrd_graph_v(
3866     int argc,
3867     char **argv)
3868 {
3869     image_desc_t im;
3870     rrd_info_t *grinfo;
3871     rrd_graph_init(&im);
3872     /* a dummy surface so that we can measure text sizes for placements */
3873     
3874     rrd_graph_options(argc, argv, &im);
3875     if (rrd_test_error()) {
3876         rrd_info_free(im.grinfo);
3877         im_free(&im);
3878         return NULL;
3879     }
3880
3881     if (optind >= argc) {
3882         rrd_info_free(im.grinfo);
3883         im_free(&im);
3884         rrd_set_error("missing filename");
3885         return NULL;
3886     }
3887
3888     if (strlen(argv[optind]) >= MAXPATH) {
3889         rrd_set_error("filename (including path) too long");
3890         rrd_info_free(im.grinfo);
3891         im_free(&im);
3892         return NULL;
3893     }
3894
3895     strncpy(im.graphfile, argv[optind], MAXPATH - 1);
3896     im.graphfile[MAXPATH - 1] = '\0';
3897
3898     if (strcmp(im.graphfile, "-") == 0) {
3899         im.graphfile[0] = '\0';
3900     }
3901
3902     rrd_graph_script(argc, argv, &im, 1);
3903     if (rrd_test_error()) {
3904         rrd_info_free(im.grinfo);
3905         im_free(&im);
3906         return NULL;
3907     }
3908
3909     /* Everything is now read and the actual work can start */
3910
3911     if (graph_paint(&im) == -1) {
3912         rrd_info_free(im.grinfo);
3913        &n