SYNOPSIS
use GD::Graph::sparklines;
my $graph = GD::Graph::sparklines->new(100, 30);
my $gd = $graph->plot( [[0,1,2,3], [16, 40, 35, 20]] );
print $gd->png();
DESCRIPTION
GD::Graph::sparklines is a Perl module for creating sparklines using the
GD::Graph infrastructure -- if you want a sparkline of your data, you
can just replace
use GD::Graph::lines;
with
use GD::Graph::sparklines;
and it will "just work", assuming you've not used any esoteric options.
GD::Graph::sparklines was originally a simple wrapper around
GD::Graph::lines but it turned out very difficult to get the graph
sizing correct without subclassing and overriding methods.
(It's also very difficult to get ploticus to draw sparklines.)
OPTIONS
GD::Graph::sparklines adds a few options to the GD::Graph set.
y_min_clip, y_max_clip
If set, clips the graph to those values (overriding any minimum or
maximum values in the data sets).
y_band_min, y_band_max
If set, plots a background "range" band between the two values.
no_blob
If set, doesn't draw the little red indicator blob on the last value.
BUGS
Undoubtedly lots. In particular, the full power of GD::Graph isn't
implemented and will probably go terribly wrong if attempted.
There's no way of setting the colour of the background band or avoiding
the light grey as first colour. This should probably be an option,
traditional, which sets the grey colours, draws the blob, etc.
The graphs are generally ugly -- I tend to render them at 4x and use "|
convert -scale 25%" to generate the final smoothed output. (GD's
copyResampled method doesn't seem to work very well otherwise there'd be
a resample option for generating anti-aliased graphs.)
CREDITS
Edward Tufte for his chapter about sparklines in "Beautiful Evidence"
Martien Verbruggen for GD::Graph
AUTHOR
Copyright (c) 2004, Rob Partington <
[email protected]>
SEE ALSO
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