X-Git-Url: https://git.octo.it/?p=rrdtool.git;a=blobdiff_plain;f=doc%2Frrdgraph.pod;h=048171a3f09bd9185858e775a120c06819778a26;hp=c451f06a31e0461313c7b24cc0f040d3aa902b7f;hb=35354e059a77479a7a135c1e4fc71c76523fd7c4;hpb=1bf4194f061e0000eff34e71e6c46c7f72eb252f

diff --git a/doc/rrdgraph.pod b/doc/rrdgraph.pod
index c451f06..048171a 100644
--- a/doc/rrdgraph.pod
+++ b/doc/rrdgraph.pod
@@ -4,7 +4,7 @@ rrdgraph - Round Robin Database tool grapher functions
 
 =head1 SYNOPSIS
 
-B<rrdtool graph> I<filename>
+B<rrdtool graph|graphv> I<filename>
 [I<L<option|rrdgraph/OPTIONS>> ...]
 [I<L<data definition|rrdgraph_data/DEF>> ...]
 [I<L<data calculation|rrdgraph_data/CDEF>> ...]
@@ -50,9 +50,16 @@ graph it (or print it).  This ends the B<rrdtool graph> sequence.
 
 =head1 OPTIONS
 
-=over 4
 
-=item filename
+=head2 B<graphv>
+
+This alternate version of B<graph> takes the same arguments and performs the
+same function. The I<v> stands for I<verbose>, which describes the output
+returned. B<graphv> will return a lot of information about the graph using
+the same format as rrdtool info (key = value). See the bottom of the document for more information.
+
+
+=head2 I<filename>
 
 The name and path of the graph to generate. It is recommended to
 end this in C<.png>, C<.svg> or C<.eps>, but B<RRDtool> does not enforce this.
@@ -60,7 +67,7 @@ end this in C<.png>, C<.svg> or C<.eps>, but B<RRDtool> does not enforce this.
 I<filename> can be 'C<->' to send the image to C<stdout>. In
 this case, no other output is generated.
 
-=item Time range
+=head2 Time range
 
 [B<-s>|B<--start> I<time>]
 [B<-e>|B<--end> I<time>]
@@ -78,7 +85,7 @@ If you want B<rrdtool graph> to get data at a one-hour resolution
 from the B<RRD>, set B<step> to 3'600. Note: a step smaller than
 one pixel will silently be ignored.
 
-=item Labels
+=head2 Labels
 
 [B<-t>|B<--title> I<string>]
 [B<-v>|B<--vertical-label> I<string>]
@@ -86,7 +93,7 @@ one pixel will silently be ignored.
 A horizontal string at the top of the graph and/or a vertically
 placed string at the left hand side of the graph.
 
-=item Size
+=head2 Size
 
 [B<-w>|B<--width> I<pixels>]
 [B<-h>|B<--height> I<pixels>]
@@ -105,7 +112,7 @@ pixels you will get a tiny graph image (thumbnail) to use as an icon
 for use in an overview, for example. All labeling will be stripped off
 the graph.
 
-=item Limits
+=head2 Limits
 
 [B<-u>|B<--upper-limit> I<value>]
 [B<-l>|B<--lower-limit> I<value>]
@@ -146,17 +153,16 @@ and thus the throughput may be higher than the WAN line speed.
 
 [B<-N>|B<--no-gridfit>]
 
-In order to avoid anti-aliasing effects gridlines are placed on
-integer pixel values. This is by default done by extending
-the scale so that gridlines happens to be spaced using an
-integer number of pixels and also start on an integer pixel value.
-This might extend the scale too much for some logarithmic scales
-and for linear scales where B<--alt-autoscale> is needed.
-Using B<--no-gridfit> disables modification of the scale.
+In order to avoid anti-aliasing blurring effects rrdtool snaps
+points to device resolution pixels, this results in a crisper
+aperance. If this is not to your liking, you can use this switch
+to turn this behaviour off.
 
-=item Grid
+Gridfitting is turned off for PDF, EPS, SVG output by default.
 
-=over 4
+=head2 Grid
+
+=over
 
 =item X-Axis
 
@@ -187,7 +193,7 @@ This places grid lines every 10 minutes, major grid lines every hour,
 and labels every 4 hours. The labels are placed under the major grid
 lines as they specify exactly that time.
 
- --x-grid HOUR:8:DAY:1:DAY:1:0:%A
+ --x-grid HOUR:8:DAY:1:DAY:1:86400:%A
 
 This places grid lines every 8 hours, major grid lines and labels
 each day. The labels are placed exactly between two major grid lines
@@ -252,7 +258,7 @@ Note that for linear graphs, SI notation is used by default.
 
 =back
 
-=item Miscellaneous
+=head2 Miscellaneous
 
 [B<-z>|B<--lazy>]
 
@@ -297,32 +303,78 @@ elements on the RRD graphs. C<DEFAULT> sets the default value for all
 elements, C<TITLE> for the title, C<AXIS> for the axis labels, C<UNIT>
 for the vertical unit label, C<LEGEND> for the graph legend.
 
-Use Times for the title: C<--font TITLE:13:/usr/lib/fonts/times.ttf>
+Use Times for the title: C<--font TITLE:13:Times>
 
 If you do not give a font string you can modify just the sice of the default font:
 C<--font TITLE:13:>.
 
 If you specify the size 0 then you can modify just the font without touching
 the size. This is especially usefull for altering the default font without
-resetting the default fontsizes: C<--font DEFAULT:0:/usr/lib/fonts/times.ttf>.
+resetting the default fontsizes: C<--font DEFAULT:0:Courier>.
 
 RRDtool comes with a preset default font. You can set the environment
 variable C<RRD_DEFAULT_FONT> if you want to change this.
 
-Truetype fonts are only supported for PNG output. See below.
+RRDtool uses Pango for its font handling. This means you can to use
+the full Pango syntax when selecting your font:
+
+The font name has the form "[I<FAMILY-LIST>] [I<STYLE-OPTIONS>] [I<SIZE>]",
+where I<FAMILY-LIST> is a comma separated list of families optionally
+terminated by a comma, I<STYLE_OPTIONS> is a whitespace separated list of
+words where each WORD describes one of style, variant, weight, stretch, or
+gravity, and I<SIZE> is a decimal number (size in points) or optionally
+followed by the unit modifier "px" for absolute size. Any one of the options
+may be absent.
+
+[B<-R>|B<--font-render-mode> {B<normal>,B<light>,B<mono>}]
 
-[B<-R>|B<--font-render-mode> {I<normal>,I<light>,I<mono>}]
+There are 3 font render modes:
+
+B<normal>: Full Hinting and Antialiasing (default)
+
+B<light>: Slight Hinting and Antialiasing
+
+B<mono>: Full Hinting and NO Antialiasing
 
-This lets you customize the strength of the font smoothing,
-or disable it entirely using I<mono>. By default, I<normal>
-font smoothing is used.
 
 [B<-B>|B<--font-smoothing-threshold> I<size>]
 
+(this gets ignored in 1.3 for now!)
+
 This specifies the largest font size which will be rendered
 bitmapped, that is, without any font smoothing. By default,
 no text is rendered bitmapped.
 
+[B<-P>|B<--pango-markup>]
+
+All text in rrdtool is rendered using Pango. With the B<--pango-markup> option, all
+text will be processed by pango markup. This allows to embed some simple html
+like markup tags using 
+ 
+ <span key="value">text</span>
+
+Apart from the verbose syntax, there are also the following short tags available.
+
+ b     Bold
+ big   Makes font relatively larger, equivalent to <span size="larger">
+ i     Italic
+ s     Strikethrough
+ sub   Subscript
+ sup   Superscript
+ small Makes font relatively smaller, equivalent to <span size="smaller">
+ tt    Monospace font
+ u     Underline 
+ 
+More details on L<http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html>.
+
+[B<-G>|B<--graph-render-mode> {B<normal>,B<mono>}]
+
+There are 2 render modes:
+
+B<normal>: Graphs are fully Antialiased (default)
+
+B<mono>: No Antialiasing
+
 [B<-E>|B<--slope-mode>]
 
 RRDtool graphs are composed of stair case curves by default. This is in line with
@@ -339,6 +391,8 @@ Times-Bold, Times-BoldItalic, Times-Italic, Times-Roman, and ZapfDingbats.
 
 [B<-i>|B<--interlaced>]
 
+(this gets ignored in 1.3 for now!)
+
 If images are interlaced they become visible on browsers more quickly.
 
 [B<-g>|B<--no-legend>]
@@ -366,7 +420,7 @@ measurement, 1 kb/s is 1000 b/s.
 Adds the given string as a watermark, horizontally centred, at the bottom 
 of the graph.
 
-=item Data and variables
+=head2 Data and variables
 
 B<DEF:>I<vname>B<=>I<rrdfile>B<:>I<ds-name>B<:>I<CF>[B<:step=>I<step>][B<:start=>I<time>][B<:end=>I<time>]
 
@@ -378,14 +432,43 @@ You need at least one B<DEF> statement to generate anything. The
 other statements are useful but optional.
 See L<rrdgraph_data> and L<rrdgraph_rpn> for the exact format.
 
-=item Graph and print elements
+=head2 Graph and print elements
 
 You need at least one graph element to generate an image and/or
 at least one print statement to generate a report.
 See L<rrdgraph_graph> for the exact format.
 
+
 =back
 
+=head2 graphv
+
+Calling rrdtool with the graphv option will return information in the
+rrdtool info format. On the command line this means that all output will be
+in key=value format. When used from the perl and ruby bindings a hash
+pointer will be returned from the call.
+
+When the filename '-' is given, the contents of the graph itself will also
+be returned through this interface (hash key 'image'). On the command line
+the output will look like this:
+
+ print[0] = "0.020833"
+ print[1] = "0.0440833"
+ graph_left = 51
+ graph_top = 22
+ graph_width = 400
+ graph_height = 100
+ image_width = 481
+ image_height = 154
+ value_min = 0.0000000000e+00
+ value_max = 4.0000000000e-02
+ image = BLOB_SIZE:8196
+ [... 8196 bytes of image data ...]
+
+There is more information returned than in the standard interface.
+Especially the 'graph_*' keys are new. They help applications that want to
+know what is where on the graph.
+
 =head1 SEE ALSO
 
 L<rrdgraph> gives an overview of how B<rrdtool graph> works.