Coordinates of random pixel displayed in window title. To make the single pixel show up better I filled in the drawing area background with black to get better contrast.
use GTK::Simple;
use GTK::Simple::DrawingArea;
use Cairo;
my ($w, $h) = 640, 480;
my ($x, $y) = (^$w).pick, (^$h).pick;
my $app = GTK::Simple::App.new(:title("Draw Pixel 2 @ $x,$y"));
my $da = GTK::Simple::DrawingArea.new;
gtk_simple_use_cairo;
$app.set-content( $da );
$app.border-width = 5;
$da.size-request($w, $h);
sub rect-do( $d, $ctx ) {
given $ctx {
.rgb(0, 0, 0);
.rectangle(0, 0, $w, $h);
.fill;
.rgb(1, 1, 0);
.rectangle($x, $y, 1, 1);
.fill;
}
}
my $ctx = $da.add-draw-handler( &rect-do );
$app.run;