#!/usr/bin/perl -w
#
# $Id: piechart.pl,v 1.4 2004/02/10 17:08:43 jeffo Exp $
#

use strict;
use GD;
use GD::Graph::pie;
use GD::Graph::colour qw(:colours);
use CGI qw(:standard);
#use Data::Dumper;

my $xdim = param('xdim');
if (not $xdim) {$xdim = 500;}
my $ydim = param('ydim');
if (not $ydim) {$ydim = 200};
my $graph = GD::Graph::pie->new($xdim,$ydim);
my @data = ([map("$_ %",split(/:/,param('values')))],
	    [split(/:/,param('values'))],
	    );
my @labels = split(/:/,param('labels'));
add_colour('decentblue' => [32,112,255]);
my $colors = $graph->get('dclrs');
$colors->[2] = 'decentblue';
#print STDERR Dumper($colors);
my $maxlen = 0;
foreach (@labels) {if ($maxlen < length($_)) {$maxlen = length($_);}}
my $legendwidth = 9*($maxlen+2) + 16 + 32;
my %opt = ('transparent' => 0,
	   'dclrs' => $colors,
	   'bgclr' => 'white',
	   'fgclr' => 'black',
	   'accentclr' => 'black',
	   'labelclr' => 'black',
	   'textclr' => 'black',
	   'l_margin' => 1,
	   'b_margin' => 1,
	   't_margin' => 1,
	   'r_margin' => $legendwidth,
	   '3d' => 1,
	   'pie_height' => 40,
	   'start_angle' => 180);
if (param('title')) {$opt{'title'} = param('title');}
if (param('xlabel')) {$opt{'x_label'} = param('xlabel');}
if (param('ylabel')) {$opt{'y_label'} = param('ylabel');}
if (param('ymax')) {$opt{'y_max_value'} = param('ymax');}
if (param('ymin')) {$opt{'y_min_value'} = param('ymin');}
if (param('yticknum')) {$opt{'y_tick_number'} = param('yticknum');}

$graph->set(%opt) or die $graph->error;
$graph->set_title_font(gdGiantFont);
$graph->set_label_font(gdGiantFont);
$graph->set_value_font(gdGiantFont);

my $gd = $graph->plot(\@data) or die $graph->error;
my $xoff = $xdim - $legendwidth + 8;
my $yoff = ($ydim - 16*(2*@labels+1))/2;
#my $deltay = ($ydim - 2*$yoff - 32)/@labels;
#open(IMG, '>file.png') or die $!;
my $black = $gd->colorClosest(0,0,0);
$gd->rectangle($xoff,$yoff,$xdim-8,$ydim-$yoff,$black);
for (my $i=0; $i < @labels; $i++) {
    $gd->rectangle($xoff+16,$yoff+16+$i*32,$xoff+32,$yoff+32+$i*32,$black);
    my $color = $gd->colorAllocate(_rgb($colors->[$i]));
    $gd->fill($xoff+24,$yoff+24+$i*32,$color);
    $gd->string(gdGiantFont,$xoff+40,$yoff+18+$i*32,$labels[$i],$black);
}
binmode STDOUT;
print header("image/png");
print $gd->png;