If you want different colours then you could create a 4 stack bar but use only 2 of the stack, the other 2 set to zero and alternate the 2 used. For example ;

#!perl
use GD::Graph::bars; 
use GD::Graph::hbars; 

my @data = ( 
['Mar1','Mar2','Apr1','Apr2','May1','May2'],
[1,0,2,0,4,0], 
[2,0,1,0,5,0], 
[0,3,0,3,0,6], 
[0,4,0,4,0,7],
); 
 
my @names = qw/sample15 sample15-h/; 

for my $my_graph (GD::Graph::bars->new, GD::Graph::hbars->new) 
{ 
  my $name = shift @names; 
  print STDERR "Processing $name\n"; 

  $my_graph->set( 
   x_label => 'X Label', 
   y_label => 'Y label', 
   title => 'Stacked Bars (incremental)', 
   cumulate => 1, 
   overwrite => 1,
   borderclrs => $my_graph->{dclrs}, 
   bar_spacing => 5, 
   transparent => 0, 
  ); 

  $my_graph->set_legend( qw(A B C D)); 
  my $gd = $my_graph->plot(\@data); 
  open(IMG, '>',$name.'.gif') or die $!;
  binmode IMG;
  print IMG $gd->gif;
  close IMG;
}

[download]
poj

In reply to Re^5: GD::Graph creating a clustered bar chart while some dataset are cumulative by poj
in thread GD::Graph creating a clustered bar chart while some dataset are cumulative by huzefa52

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.