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#!/usr/bin/perl
# $Id: color-circular.pl 1420 2004-04-30 11:35:18Z lecoanet $
# these simple samples have been developped by C. Mertz mertz@cena.fr
use vars qw( $VERSION );
($VERSION) = sprintf("%d.%02d", q$Revision: 1420 $ =~ /(\d+)\.(\d+)/);
use Tk;
use Tk::Zinc;
use strict;
my $defaultfont = '-adobe-helvetica-bold-r-normal--*-120-*-*-*-*-*-*';
my $mw = MainWindow->new();
my $zinc = $mw->Zinc(-width => 700, -height => 600,
-borderwidth => 3, -relief => 'sunken',
-render => 1, # for activating the openGL render
)->pack;
# This demo no more dies if there is no openGL. It simply displays
# a string on the bootom of the window!
$zinc->add('rectangle', 1, [10, 10, 80, 80], -fillcolor => "=radial 50 50 |red |blue", -filled => 1);
$zinc->add('text', 1,
-font => $defaultfont,
-text => "Radial variation from non-transparent red to non-transparent blue\nin a squarre. The gradient starts from the lower right corner.\n",
-anchor => 'nw',
-position => [120, 20]);
$zinc->add('arc', 1, [10, 110, 90, 190], -fillcolor => "=radial 0 25 |red;40|blue;40", -filled => 1);
$zinc->add('text', 1,
-font => $defaultfont,
-text => "Radial variation from 40%transparent red to 40% transparent blue\nin a disc. The gradient starts in the middle between\nthe center on the bottom point",
-anchor => 'nw',
-position => [120, 120]);
$zinc->add('arc', 1, [10, 210, 90, 290], -fillcolor => "=radial 0 0 |red;40|green;40 50|blue;40", -filled => 1);
$zinc->add('text', 1,
-font => $defaultfont,
-text => "A variation from 40%transparent red to 40% transparent blue.\n".
"through a 40%green on the middle of the disc. The gradient is centered.",
-anchor => 'nw',
-position => [120, 220]);
$zinc->add('text', 1,
-font => $defaultfont,
-text => "Two overlaping radialy, transparently colored items on a white background",
-anchor => 'nw',
-position => [20, 320]);
$zinc->add('rectangle', 1, [10, 340, 690, 590], -fillcolor => "white", -filled => 1);
$zinc->add('rectangle', 1, [20, 365, 220, 565], -fillcolor => "=radial 0 0 |red;40|green;40 50|blue;40", -filled => 1);
$zinc->add('arc', 1, [150, 365, 350, 565], -fillcolor => "=radial 0 0 |yellow;40|black;40 50|cyan;40", -filled => 1);
$zinc->add('arc', 1, [280, 365, 480, 565], -fillcolor => "=radial 0 0 |black;100|black;100 20|white;40", -filled => 1, -linewidth => 0);
$zinc->add('arc', 1, [480, 365, 580, 500], -fillcolor => "=radial -10 16 |black;100|white;40", -filled => 1);
$zinc->add('arc', 1, [580, 410, 680, 580], -fillcolor => "=radial -40 -40 |black;70|white;20", -filled => 1);
$zinc->add('arc', 1, [580, 410, 680, 580], -fillcolor => "=radial 40 40 |black;70|white;20", -filled => 1);
$zinc->add('text', 1,
-font => $defaultfont,
-text => "WITHOUT openGL, NO GRADIENT. SORRY!",
-anchor => 'nw',
-position => [20, 550]) unless $zinc->cget(-render);
MainLoop;
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