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#!/usr/bin/perl
use strict;
use warnings;
use Cairo;
use constant
{
WIDTH => 450,
HEIGHT => 600,
TEXT => 'hello, world',
NUM_GLYPHS => 10,
M_PI => 4 * atan2(1, 1),
};
sub box_text
{
my ($cr, $utf8, $x, $y) = @_;
$cr->save;
my $extents = $cr->text_extents (TEXT);
my $line_width = $cr->get_line_width;
$cr->rectangle ($x + $extents->{x_bearing} - $line_width,
$y + $extents->{y_bearing} - $line_width,
$extents->{width} + 2 * $line_width,
$extents->{height} + 2 *$line_width);
$cr->stroke;
$cr->move_to ($x, $y);
$cr->show_text ($utf8);
$cr->move_to ($x, $y);
$cr->text_path ($utf8);
$cr->set_source_rgb (1, 0, 0);
$cr->set_line_width (1.0);
$cr->stroke;
$cr->restore;
}
sub box_glyphs
{
my ($cr, $x, $y, @glyphs) = @_;
$cr->save;
my $extents = $cr->glyph_extents (@glyphs);
my $line_width = $cr->get_line_width;
$cr->rectangle ($x + $extents->{x_bearing} - $line_width,
$y + $extents->{y_bearing} - $line_width,
$extents->{width} + 2 * $line_width,
$extents->{height} + 2 * $line_width);
$cr->stroke;
foreach my $glyph (@glyphs) {
$glyph->{x} += $x;
$glyph->{y} += $y;
}
$cr->show_glyphs (@glyphs);
$cr->glyph_path (@glyphs);
$cr->set_source_rgb (1, 0, 0);
$cr->set_line_width (1.0);
$cr->stroke;
foreach my $glyph (@glyphs) {
$glyph->{x} -= $x;
$glyph->{y} -= $y;
}
$cr->restore;
}
{
my $surface = Cairo::ImageSurface->create ('argb32', WIDTH, HEIGHT);
my $cr = Cairo::Context->create ($surface);
$cr->set_source_rgb (0, 0, 0);
$cr->set_line_width (2.0);
$cr->save;
$cr->rectangle (0, 0, WIDTH, HEIGHT);
$cr->set_source_rgba (0, 0, 0, 0);
$cr->set_operator ('source');
$cr->fill;
$cr->restore;
$cr->select_font_face ('sans', 'normal', 'normal');
$cr->set_font_size (40);
if (1) {
my $matrix = Cairo::Matrix->init_scale (40, -40);
$cr->set_font_matrix ($matrix);
$cr->scale (1, -1);
$cr->translate (0, - HEIGHT);
}
my $font_extents = $cr->font_extents;
my $height = $font_extents->{height};
my @glyphs = ();
my $dx = 0;
my $dy = 0;
foreach (0 .. NUM_GLYPHS - 1) {
my $glyph = { index => $_ + 4, x => $dx, y => $dy };
my $extents = $cr->glyph_extents ($glyph);
$dx += $extents->{x_advance};
$dy += $extents->{y_advance};
push @glyphs, $glyph;
}
box_text ($cr, TEXT, 10, $height);
$cr->translate (0, $height);
$cr->save;
{
$cr->translate (10, $height);
$cr->rotate (10 * M_PI / 180);
box_text ($cr, TEXT, 0, 0);
}
$cr->restore;
$cr->translate (0, 2 * $height);
$cr->save;
{
my $matrix = Cairo::Matrix->init_identity;
$matrix->scale (40, -40);
$matrix->rotate (-10 * M_PI / 180);
$cr->set_font_matrix ($matrix);
box_text ($cr, TEXT, 10, $height);
}
$cr->restore;
$cr->translate (0, 2 * $height);
box_glyphs ($cr, 10, $height, @glyphs);
$cr->translate (10, 2 * $height);
$cr->save;
{
$cr->rotate (10 * M_PI / 180);
box_glyphs ($cr, 0, 0, @glyphs);
}
$cr->restore;
$cr->translate (0, $height);
foreach (0 .. NUM_GLYPHS - 1) {
$glyphs[$_]->{y} += $_ * 5;
}
box_glyphs ($cr, 10, $height, @glyphs);
$surface->write_to_png ('text.png');
}
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