Hi Monks
I want to create a bar plot with GD-Graph, but I do want to set the colours of the various legends manually. I read the data from a file and store them in an array, but how can the program "understand" how many variables I have and find different colour for each one?
#script for table of summarized results for whole dataset

use GD::Graph::bars;
use GD::Graph::hbars;

@methods=();    #keeps methods' names
@data=();        #keeps all data
@all=();        #keeps everything

open IN, $ARGV[0];
while (<IN>)
{
        chomp $_;
        
        if($_=~/^METHOD\t(.*)/)        #1st line is the Header line
        {
            $header_all = $1;
            @split_header = split(/\t/, $header_all);
        }
        else
        {
            $method_line = $_;    #lines with the methods
            @split_method = split(/\t/, $method_line);
            
            $method_name= shift (@split_method);
            
            push @methods, $method_name;
            push @data, @split_method;
        }

}
close IN;

@all = ( @methods, @data);

$legend = "@methods";

$name = "TEST";
$my_graph = GD::Graph::bars->new;

$my_graph->set(
#x_label => 'X Label',
#y_label => 'Y label',
#title => 'Stacked Bars (incremental)',
#y_max_value => 50,
#y_tick_number => 10,
#y_label_skip => 2,
cumulate => 2,
borderclrs => $my_graph->{dclrs},
#cycle_clrs => 2,
bar_spacing => 4,
#shadow_depth => 4,

transparent => 0,
);

$my_graph->set_legend(@split_methods);
$my_graph->plot(\@all);
save_chart($my_graph, $name);


sub save_chart
{
    $chart = shift or die "Need a chart!";
    $name = shift or die "Need a name!";
    local(*OUT);

    $ext = 'png';
    open(OUT, ">$name.$ext") or 
        die "Cannot open $name.$ext for write: $!";
    binmode OUT;
    print OUT $chart->gd->$ext();
    close OUT;
}

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In reply to Generating X number of colours in GD-Graph? by Anonymous Monk

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