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AFAIK there is no *method* but there is a *way* It does involve tinkering directly with the object internals and a private method but it gets the job done. See this example png from the code below Any direct tinkering with private methods is to be frowned upon but it might be a worthwhile patch to submit for a new method....

use GD::Graph::lines; my @data = ( ["1st","2nd","3rd","4th","5th","6th","7th", "8th", "9th"], [ 1, 2, 5, 6, 3, 1.5, 1, 3, 4], [ sort { $a <=> $b } (1, 2, 5, 6, 3, 1.5, 1, 3, 4) ] ); my $graph = GD::Graph::lines->new(400, 300); $graph->set( x_label => 'X Label', y_label => 'Y label', title => 'Some simple graph', y_max_value => 8, y_tick_number => 8, y_label_skip => 2 ) or die $graph->error; # plot it to get some of the data values we want into $graph object my $gd = $graph->plot(\@data) or die $graph->error; # you may need to look at the object if your line pos is less simple #use Data::Dumper; #print Dumper $graph; # this is the hack..... my $x_zero = $graph->{left}; # abs zero point co-ord my $x_step = $graph->{x_step}; # x step pixels my $xp = $x_zero + $x_step * 5; # the 5th data point abs x co-ord my $t = $graph->{top}; # top abs y co-ord my $b = $graph->{bottom}; # bottom abs y co-ord my $mclr = 2; # 1 = blue, 2 = grey, 3 = red ... # now draw the line in...... $graph->{graph}->line($xp, $t, $xp, $b, $mclr); open(IMG, '>C:/file.png') or die $!; binmode IMG; print IMG $gd->png; close IMG;

cheers

tachyon


In reply to Re: GD::Graph vertical line by tachyon
in thread GD::Graph vertical line by Ryszard

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