added --alt-autoscale-min (see --alt-autoscale-max) -- Helge Oldach

git-svn-id: svn://svn.oetiker.ch/rrdtool/branches/1.2/program@1036 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/doc/rrdgraph.pod b/doc/rrdgraph.pod
index 59d3ac4..9060bd8 100644 (file)
--- a/doc/rrdgraph.pod
+++ b/doc/rrdgraph.pod
@@ -123,6 +123,14 @@ maximum y-axis from the actual minimum and maximum data values. Our example
 would display slightly less than C<260-0.001> to slightly more than
 C<260+0.001> (this feature was contributed by Sasha Mikheev).
 
+[B<-J>|B<--alt-autoscale-min>]
+
+Where C<--alt-autoscale> will modify both the absolute maximum AND minimum
+values, this option will only affect the minimum value. The maximum
+value, if not defined on the command line, will be 0. This option can
+be useful when graphing router traffic when the WAN line uses compression,
+and thus the throughput may be higher than the WAN line speed.
+
 [B<-M>|B<--alt-autoscale-max>]
 
 Where C<--alt-autoscale> will modify both the absolute maximum AND minimum

diff --git a/src/rrd_graph.c b/src/rrd_graph.c
index 47c187a..e7554ac 100644 (file)
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -399,6 +399,13 @@ expand_range(image_desc_t *im)
               im->minval -= adj;
               im->maxval += adj;
         }
+       else if(im->extra_flags & ALTAUTOSCALE_MIN) {
+           /* measure the amplitude of the function. Make sure that
+              graph boundaries are slightly lower than min vals
+              so we can see amplitude on the graph */
+             adj = (im->maxval - im->minval) * 0.1;
+             im->minval -= adj;
+       }
         else if(im->extra_flags & ALTAUTOSCALE_MAX) {
             /* measure the amplitude of the function. Make sure that
                graph boundaries are slightly higher than max vals
@@ -3223,6 +3230,7 @@ rrd_graph_options(int argc, char *argv[],image_desc_t *im)
             {"no-minor",   no_argument,       0,  'I'},
             {"slope-mode", no_argument,              0,  'E'},
             {"alt-autoscale", no_argument,    0,  'A'},
+           {"alt-autoscale-min", no_argument, 0, 'J'},
             {"alt-autoscale-max", no_argument, 0, 'M'},
             {"no-gridfit", no_argument,       0,   'N'},
             {"units-exponent",required_argument, 0, 'X'},
@@ -3255,6 +3263,9 @@ rrd_graph_options(int argc, char *argv[],image_desc_t *im)
             break;
         case 'A':
             im->extra_flags |= ALTAUTOSCALE;
+           break;
+       case 'J':
+           im->extra_flags |= ALTAUTOSCALE_MIN;
             break;
         case 'M':
             im->extra_flags |= ALTAUTOSCALE_MAX;

diff --git a/src/rrd_graph.h b/src/rrd_graph.h
index e970d8b..e83b442 100644 (file)
--- a/src/rrd_graph.h
+++ b/src/rrd_graph.h
@@ -10,14 +10,15 @@
 
 #define ALTYGRID        0x01   /* use alternative y grid algorithm */
 #define ALTAUTOSCALE    0x02   /* use alternative algorithm to find lower and upper bounds */
-#define ALTAUTOSCALE_MAX 0x04  /* use alternative algorithm to find upper bounds */
-#define NOLEGEND        0x08   /* use no legend */
-#define NOMINOR          0x10    /* Turn off minor gridlines */
-#define ONLY_GRAPH       0x20   /* use only graph */
-#define FORCE_RULES_LEGEND 0x40        /* force printing of HRULE and VRULE legend */
+#define ALTAUTOSCALE_MIN 0x04  /* use alternative algorithm to find lower bounds */
+#define ALTAUTOSCALE_MAX 0x08  /* use alternative algorithm to find upper bounds */
+#define NOLEGEND        0x10   /* use no legend */
+#define NOMINOR          0x20    /* Turn off minor gridlines */
+#define ONLY_GRAPH       0x40   /* use only graph */
+#define FORCE_RULES_LEGEND 0x80        /* force printing of HRULE and VRULE legend */
 
-#define FORCE_UNITS 0x80        /* mask for all FORCE_UNITS_* flags */
-#define FORCE_UNITS_SI 0x80     /* force use of SI units in Y axis (no effect in linear graph, SI instead of E in log graph) */
+#define FORCE_UNITS 0x100        /* mask for all FORCE_UNITS_* flags */
+#define FORCE_UNITS_SI 0x100     /* force use of SI units in Y axis (no effect in linear graph, SI instead of E in log graph) */
 
 enum tmt_en {TMT_SECOND=0,TMT_MINUTE,TMT_HOUR,TMT_DAY,
             TMT_WEEK,TMT_MONTH,TMT_YEAR};