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Re: Coaking GDGraph to work...

by iguanodon (Priest)
on Feb 04, 2003 at 14:11 UTC ( #232526=note: print w/replies, xml ) Need Help??

in reply to Coaking GDGraph to work...

Here's a snippet from something I did with GD::Graph that read from a flat file:
foreach (@lines) { # Lines in the file look like: # Sun Jul 07 2002 10:03:03 Sensor 0 [100D973000080069] C: 25.1 F: +77.1 chomp; my ($day, $mon, $date, $year, $time, undef, $sensor, undef, undef, + $c, undef, $f) = split; push (@{$data[0]}, $day); push (@{$data[$sensor + 1]}, $f); $y_max = $y_max > $f ? $y_max : $f; $y_min = $y_min < $f ? $y_min : $f; } my $y_axis_max = ceil($y_max / 10) * 10; my $y_axis_min = floor($y_min / 10) * 10; my $y_ticks = ($y_axis_max - $y_axis_min) / 10; my $graph = new GD::Graph::lines(); $graph->set( x_label => 'Day', y_label => 'Temperature (F)', title => $title, y_max_value => $y_axis_max, y_min_value => $y_axis_min, y_tick_number => 16, y_label_skip => 2, box_axis => 1, line_width => 3, y_label_position => 1, x_label_skip => 48, x_tick_offset => 48, x_long_ticks => 1, transparent => 0, ); $graph->set_legend(@legend_labels); $graph->plot($data); save_chart($graph, "$img_path/$img_file");
Note that all arrays passed to plot() should be the same size. If they're not, pad the beginning of any short arrays with undef.

BTW, I've since switched from using a flat file to a MySQL database, and from GD::Graph to Chart::Graph::Gnuplot. I like Chart::Graph::Gnuplot because of the amount of control Gnuplot gives over the graph. If you've ever created Gnuplot input files yourself, you'll appreciate this module. Of course, some may consider it a drawback that it relies on an external program.

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