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#!/usr/bin/perl -w
# $Id: fillrule.pl 1551 2004-09-21 12:47:28Z mertz $
# This simple demo has been developped by C. Mertz <mertz@cena.fr>
####### This file has been largely inspired from figure 11-3
####### of "The OpenGL Programming Guide 3rd Edition, The
####### Official Guide to Learning OpenGL Version 1.2", ISBN 0201604582
####### it illustrates the use of :
####### -fillrule attribute of curves
####### contour, coords and clone method
use vars qw( $VERSION );
($VERSION) = sprintf("%d.%02d", q$Revision: 1551 $ =~ /(\d+)\.(\d+)/);
use Tk::Zinc;
my $mw = MainWindow->new();
$mw->title('example of multiple contours and fillrule usage');
my $zinc = $mw->Zinc(-width => 510, -height => 630,
-font => "10x20",
-font => "9x15",
-borderwidth => 0,
-backcolor => "white",
)->pack;
$zinc->add('text', 1, -position => [20,8], -text => "This (still static) example reproduces figure 11-3
of \"The OpenGL Programming Guide 3rd Edition\" V 1.2");
my $group = $zinc->add('group', 1);
my $g1 = $zinc->add('group', $group);
my $curve1 = $zinc->add('curve',$g1, []);
$zinc->contour($curve1, "add", +1, [ 0,0, 0,120, 120,120, 120,0, 0,0]);
$zinc->contour($curve1, "add", +1, [ 20,20, 20,100, 100,100, 100,20, 20,20]);
$zinc->contour($curve1, "add", +1, [ 40,40, 40,80, 80,80, 80,40, 40,40]);
$zinc->translate($g1, 40,40);
my $g2 = $zinc->add('group', $group);
my $curve2 = $zinc->add('curve',$g2, []);
$zinc->contour($curve2, "add", +1, [ 0,0, 0,120, 120,120, 120,0, 0,0]);
$zinc->contour($curve2, "add", -1, [ 20,20, 20,100, 100,100, 100,20, 20,20]);
$zinc->contour($curve2, "add", -1, [ 40,40, 40,80, 80,80, 80,40, 40,40]);
$zinc->translate($g2, 200,40);
my $g3 = $zinc->add('group', $group);
my $curve3 = $zinc->add('curve',$g3, []);
$zinc->contour($curve3, "add", +1, [ 20,0, 20,120, 100,120, 100,0, 20,0]);
$zinc->contour($curve3, "add", +1, [ 40,20, 60,120, 80,20, 40,20]);
$zinc->contour($curve3, "add", +1, [ 0,60, 0,80, 120,80, 120,60, 0,60]);
$zinc->translate($g3, 360,40);
my $g4 = $zinc->add('group', $group);
my $curve4 = $zinc->add('curve',$g4, []);
$zinc->contour($curve4, "add", +1, [ 0,0, 0,140, 140,140, 140,60, 60,60, 60,80, 80,80, 80,40, 40,40,
40,100, 100,100, 100,20, 20,20,
20,120, 120,120, 120,0, 0,0]);
$zinc->translate($g4, 520,40);
$zinc->scale($group, 0.6, 0.6);
$zinc->translate($group, 80,20);
$zinc->add('text',$group, -position => [-110, 40], -text => "contours\nand\nwinding\nnumbers");
$zinc->add('text',$group, -position => [-110, 170], -text => "winding\nrules");
my $dy = 0;
foreach my $fillrule ('odd', 'nonzero', 'positive', 'negative', 'abs_geq_2') {
$dy += 160;
$zinc->add('text',$group, -position => [-110, 100+$dy], -text => $fillrule eq 'odd' ? "odd\n(default)" : $fillrule);
foreach my $item ($curve1, $curve2, $curve3, $curve4) {
my $clone = $zinc->clone($item, -fillrule => $fillrule, -filled => 1);
$zinc->translate($clone, 0,$dy);
}
}
# creating simple lines with arrows under each curves
foreach my $item ($curve1, $curve2, $curve3, $curve4) {
my $contour_number = $zinc->contour($item);
# print "$item => contour_number=$contour_number\n";
foreach my $n (0..$contour_number-1) {
my @points = $zinc->coords($item,$n);
# print " ",$#points,"points\n";
foreach my $i (0 .. $#points-1) {
# print " line $i ",$i+1,"\n";
$firstpoint = $points[$i];
$lastpoint = $points[$i+1];
$middlepoint = [$firstpoint->[0]+($lastpoint->[0]-$firstpoint->[0])/1.5,
$firstpoint->[1]+($lastpoint->[1]-$firstpoint->[1])/1.5];
$zinc->add("curve", $zinc->group($item),
[ $firstpoint, $middlepoint],
-lastend => [7,10,4]);
}
}
}
&Tk::MainLoop;
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