MatrixRotate.hx

class MatrixRotate {
	static function main() {
		final w = 3;
		final h = 2;
		final m = [
			1, 0, 2,
			0, 3, 4
		];
		p(r90(m, w, h), h, w);
		p(r180(m, w, h), w, h);
		p(r270(m, w, h), h, w);
	}

	static function r90(m:Array<Int>, w:Int, h:Int):Array<Int> {
		final r = [];
		var d = h;
		for (y in 0...h) {
			d--;
			final offset = y * w;
			for (x in 0...w)
				r[d + x * h] = m[offset + x];
		}
		return r;
	}

	static function r180(m:Array<Int>, w:Int, h:Int):Array<Int> {
		final s = w * h;
		final r = [];
		for (i => v in m)
			r[s - 1 - i] = v;
		return r;
	}

	static function r270(m:Array<Int>, w:Int, h:Int):Array<Int> {
		final s = w * h;
		final r = [];
		for (y in 0...h) {
			final sourceOffset = y * w;
			final destOffset = s - h + y;
			for (x in 0...w) {
				r[destOffset - x * h] = m[sourceOffset + x];
			}
		}
		return r;
	}

	static function p(m:Array<Int>, w:Int, h:Int):Void {
		trace('------------------');
		for (y in 0...h) {
			trace([for (x in 0...w) m[y * w + x]].join(' '));
		}
	}
}