fixed indentation, added documentation note on gridfitting.

[rrdtool.git] / doc / rrdgraph.pod

diff --git a/doc/rrdgraph.pod b/doc/rrdgraph.pod
index 6017efd..b605fae 100644 (file)
--- a/doc/rrdgraph.pod
+++ b/doc/rrdgraph.pod
@@ -68,7 +68,7 @@ this case, no other output is generated.
 
 The start and end of the time series you would like to display, and which
 B<RRA> the data should come from.  Defaults are: 1 day ago until
 
 The start and end of the time series you would like to display, and which
 B<RRA> the data should come from.  Defaults are: 1 day ago until

-now, with the best possible resolution. B<Start> and B<end> can 
+now, with the best possible resolution. B<Start> and B<end> can

 be specified in several formats, see
 L<AT-STYLE TIME SPECIFICATION|rrdfetch/> and L<rrdgraph_examples>.
 By default, B<rrdtool graph> calculates the width of one pixel in
 be specified in several formats, see
 L<AT-STYLE TIME SPECIFICATION|rrdfetch/> and L<rrdgraph_examples>.
 By default, B<rrdtool graph> calculates the width of one pixel in


@@ -91,10 +91,15 @@ placed string at the left hand side of the graph.
 [B<-w>|B<--width> I<pixels>]
 [B<-h>|B<--height> I<pixels>]
 [B<-j>|B<--only-graph>]
 [B<-w>|B<--width> I<pixels>]
 [B<-h>|B<--height> I<pixels>]
 [B<-j>|B<--only-graph>]

+[B<-D>|B<--full-size-mode>]

 
 

-The width and height of the B<canvas> (the part of the graph with
+By default, the width and height of the B<canvas> (the part with

 the actual data and such). This defaults to 400 pixels by 100 pixels.
 
 the actual data and such). This defaults to 400 pixels by 100 pixels.
 

+If you specify the B<--full-size-mode> option, the width and height
+specify the final dimensions of the output image and the canvas
+is automatically resized to fit.
+

 If you specify the B<--only-graph> option and set the height E<lt> 32
 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
 If you specify the B<--only-graph> option and set the height E<lt> 32
 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


@@ -123,6 +128,14 @@ 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).
 
 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
 [B<-M>|B<--alt-autoscale-max>]
 
 Where C<--alt-autoscale> will modify both the absolute maximum AND minimum


@@ -133,13 +146,12 @@ and thus the throughput may be higher than the WAN line speed.
 
 [B<-N>|B<--no-gridfit>]
 
 
 [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.
+
+Gridfitting is turned off for PDF, EPS, SVG output by default.

 
 =item Grid
 
 
 =item Grid
 


@@ -191,13 +203,18 @@ placed every I<label factor> lines.  You can specify C<-y none> to
 suppress the grid and labels altogether.  The default for this option is
 to automatically select sensible values.
 
 suppress the grid and labels altogether.  The default for this option is
 to automatically select sensible values.
 

+If you have set --y-grid to 'none' not only the labels get supressed, also
+the space reserved for the labels is removed. You can still add space
+manually if you use the --units-length command to explicitly reserve space.
+

 [B<-Y>|B<--alt-y-grid>]
 
 [B<-Y>|B<--alt-y-grid>]
 

-Place the Y grid dynamically based on the graph's Y range. The
-algorithm ensures that you always have a grid, that there are enough
-but not too many grid lines, and that the grid is metric. That is the
-grid lines are placed every 1, 2, 5 or 10 units.  (contributed by
-Sasha Mikheev)
+Place the Y grid dynamically based on the graph's Y range. The algorithm
+ensures that you always have a grid, that there are enough but not too many
+grid lines, and that the grid is metric. That is the grid lines are placed
+every 1, 2, 5 or 10 units. This parameter will also ensure that you get
+enough decimals displayed even if your graph goes from 69.998 to 70.001. 
+(contributed by Sasha Mikheev).

 
 [B<-o>|B<--logarithmic>]
 
 
 [B<-o>|B<--logarithmic>]
 


@@ -226,6 +243,12 @@ How many digits should rrdtool assume the y-axis labels to be? You
 may have to use this option to make enough space once you start
 fideling with the y-axis labeling.
 
 may have to use this option to make enough space once you start
 fideling with the y-axis labeling.
 

+[B<--units=si>]
+
+With this option y-axis values on logarithmic graphs will be scaled to 
+the appropriate units (k, M, etc.) instead of using exponential notation.
+Note that for linear graphs, SI notation is used by default.
+

 =back
 
 =item Miscellaneous
 =back
 
 =item Miscellaneous


@@ -260,38 +283,69 @@ and blue. Optionally you may add another hexadecimal number specifying the
 transparency (FF is solid). You may set this option several times to alter
 multiple defaults.
 
 transparency (FF is solid). You may set this option several times to alter
 multiple defaults.
 

-A green arrow is made by: C<--color ARROW:00FF00>
+A green arrow is made by: C<--color ARROW#00FF00>

 
 [B<--zoom> I<factor>]
 
 Zoom the graphics by the given amount. The factor must be E<gt> 0
 
 
 [B<--zoom> I<factor>]
 
 Zoom the graphics by the given amount. The factor must be E<gt> 0
 

-[B<-n>|B<--font> I<FONTTAG>B<:>I<size>B<:>I<font>]
+[B<-n>|B<--font> I<FONTTAG>B<:>I<size>B<:>[I<font>]]

 
 This lets you customize which font to use for the various text
 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.
 
 
 This lets you customize which font to use for the various text
 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:Courier>.

 
 RRDtool comes with a preset default font. You can set the environment
 variable C<RRD_DEFAULT_FONT> if you want to change this.
 
 
 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>]
 
 
 [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.
 
 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<-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
 [B<-E>|B<--slope-mode>]
 
 RRDtool graphs are composed of stair case curves by default. This is in line with


@@ -308,6 +362,8 @@ Times-Bold, Times-BoldItalic, Times-Italic, Times-Roman, and ZapfDingbats.
 
 [B<-i>|B<--interlaced>]
 
 
 [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>]
 If images are interlaced they become visible on browsers more quickly.
 
 [B<-g>|B<--no-legend>]


@@ -330,6 +386,11 @@ If you are graphing memory (and NOT network traffic) this switch
 should be set to 1024 so that one Kb is 1024 byte. For traffic
 measurement, 1 kb/s is 1000 b/s.
 
 should be set to 1024 so that one Kb is 1024 byte. For traffic
 measurement, 1 kb/s is 1000 b/s.
 

+[B<-W>|B<--watermark> I<string>]
+
+Adds the given string as a watermark, horizontally centred, at the bottom 
+of the graph.
+

 =item 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>]
 =item 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>]


@@ -348,6 +409,27 @@ 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.
 
 at least one print statement to generate a report.
 See L<rrdgraph_graph> for the exact format.
 

+=item Markup
+
+All text in rrdtool is rendered using Pango markup. This means text can contain embeded markup instructions.
+Simple html markup using 
+ 
+ <span key="value">text</span>
+
+can be used. 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 http://developer.gnome.org/doc/API/2.0/pango/PangoMarkupFormat.html.
+

 =back
 
 =head1 SEE ALSO
 =back
 
 =head1 SEE ALSO


@@ -361,7 +443,7 @@ Make sure to read L<rrdgraph_examples> for tipsE<amp>tricks.
 
 =head1 AUTHOR
 
 
 =head1 AUTHOR
 

-Program by Tobias Oetiker E<lt>oetiker@ee.ethz.chE<gt>
+Program by Tobias Oetiker E<lt>tobi@oetiker.chE<gt>

 
 This manual page by Alex van den Bogaerdt E<lt>alex@ergens.op.het.netE<gt>
 
 
 This manual page by Alex van den Bogaerdt E<lt>alex@ergens.op.het.netE<gt>