Viewing file: outline.pl (2.07 KB) -rw-r--r-- Select action/file-type: (+) | (+) | (+) | Code (+) | Session (+) | (+) | SDB (+) | (+) | (+) | (+) | (+) | (+) |
#!/usr/bin/perl
use strict; use warnings; use Cairo;
use constant { WIDTH => 750, HEIGHT => 500, };
{ my $surf = Cairo::ImageSurface->create ('argb32', WIDTH, HEIGHT); my $cr = Cairo::Context->create ($surf);
$0 =~ /(.*)\.pl/; my $out = "$1.png";
$cr->rectangle (0, 0, WIDTH, HEIGHT); $cr->set_source_rgb (1, 1, 1); $cr->fill;
draw_outlines ($cr, WIDTH, HEIGHT);
$cr->show_page;
$surf->write_to_png ($out); }
sub create_gradient { my ($cr, $width, $height) = @_;
my $gradient = Cairo::LinearGradient->create (0, 0, $width, 0);
$gradient->add_color_stop_rgb (0.0, 0., 0., 0.); $gradient->add_color_stop_rgb (0.5, 1., 1., 1.); $gradient->add_color_stop_rgb (1.0, 0., 0., 0.);
return $gradient; }
sub draw_outlines { my ($cr, $surface_width, $surface_height) = @_;
my $gradient; my ($width, $height, $pad);
$width = $surface_width / 4.0; $pad = ($surface_width - (3 * $width)) / 2.0; $height = $surface_height;
$gradient = create_gradient ($cr, $width, $height);
$cr->set_source ($gradient); draw_flat ($cr, $width, $height);
$cr->translate ($width + $pad, 0); $cr->set_source ($gradient); draw_tent ($cr, $width, $height);
$cr->translate ($width + $pad, 0); $cr->set_source ($gradient); draw_cylinder ($cr, $width, $height);
$cr->restore; }
sub draw_flat { my ($cr, $width, $height) = @_;
my $hwidth = $width / 2.0;
$cr->rectangle (0, $hwidth, $width, $height - $hwidth);
$cr->fill; }
sub draw_tent { my ($cr, $width, $height) = @_;
my $hwidth = $width / 2.0;
$cr->move_to ( 0, $hwidth); $cr->rel_line_to ( $hwidth, -$hwidth); $cr->rel_line_to ( $hwidth, $hwidth); $cr->rel_line_to ( 0, $height - $hwidth); $cr->rel_line_to (-$hwidth, -$hwidth); $cr->rel_line_to (-$hwidth, $hwidth); $cr->close_path;
$cr->fill; }
sub draw_cylinder { my ($cr, $width, $height) = @_;
my $hwidth = $width / 2.0;
$cr->move_to (0, $hwidth); $cr->rel_curve_to (0, -$hwidth, $width, -$hwidth, $width, 0); $cr->rel_line_to (0, $height - $hwidth); $cr->rel_curve_to (0, -$hwidth, -$width, -$hwidth, -$width, 0); $cr->close_path;
$cr->fill; }
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