A couple of months back, I needed a checkerboard pattern and probably used the most inefficient and cumbersome method to create it. Never again!
EDIT: I just noticed that when you have a non-quadratic image, things don’t quite work as I intended. I’m working on a fix and a couple of other patterns to release all together.
$color1 = [0,0,0];
$color2 = [1,1,1];
$scale_horizontal = 10 ; # 1,500
$scale_vertical = 10; # 1,500
$offset_horizontal = 5; # 1,500
$offset_vertical = 5; # 1,500
$rotation = 0; # 0,360
$rotated = rotate([$u, $v, 0], [0, 0, 1], rad($rotation));
$u = $rotated[0];
$v = $rotated[1];
$x = round(($u + $offset_horizontal / 100) / $scale_horizontal * 100);
$y = round(($v + $offset_vertical / 100) / $scale_vertical * 100);
$cond1 = ($x % 2 == 0);
$cond2 = ($y % 2 == 0);
if (($cond1 || $cond2) && !($cond1 && $cond2)) {
# $cond1 XOR $cond2
$color = $color1;
} else {
$color = $color2;
}
$color
