Graphing libraries to create grid like charts: Perl, Java

Graphing libraries to create grid like charts

Asked by: kawas

Hi,
I want to create some graphs programatically, using Java or Perl. I want to replicate a graph like the following on 'grid paper':

|
| U
|UDUD
|UDUD
|U
|____________

The only thing missing from the example is the grid background (sorry, i am not that talented to show that here). For Java, i found the library jfreecharts, but I didnt dig too deep into it. For perl, i found GD::Charts. Nice module, but I couldnt figure out how to create the grids properly...

I am looking for code examples, not pointers to doc (of course I would like pointers if you also give me code samples).
Thanks

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#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;
use GD;
 
my @data = 
  ([20],
   [19, 'x'],
   [18, undef, 'x'],
   [17, undef, undef, 'a'],
   );
my $Rows = 4;
my $Cols = 4;   
 
my $Width=200;
my $Height=100;
my $image = new GD::Image($Width,$Height);
my $white = $image->colorAllocate(255,255,255);
my $black = $image->colorAllocate(0,0,0);
my $grey  = $image->colorAllocate(192,192,192);
 
#First, draw grid
for(my $row=0; $row<=$Rows; $row++) {
	my $y=($row/$Rows)*($Height-1);
	$image->line(0,$y,$Width,$y,$grey);
}
for(my $col=0; $col<=$Cols; $col++) {
	my $x=($col/$Cols)*($Width-1);
	$image->line($x,0,$x,$Height,$grey);
}
 
for(my $row=0; $row<$Rows; $row++) {
	for(my $col=0; $col<$Cols; $col++) {
		my $y=($row/$Rows)*$Height+5;  # +5 for border
		my $x=($col/$Cols)*$Width+5;   # +5 for border
		my $string = ($data[$row]->[$col] or "");
		$image->string(gdSmallFont,$x,$y,$string,$black);
	}
}
 
open(my $OUT, ">out1.png") or die "output: $!\n";
binmode($OUT);
print $OUT $image->png;
close($OUT);

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Graphing libraries to create grid like charts

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Perl, Java

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