Att ta reda på vilken sida av rektangeln som kolliderar

	function collision() {
		player.isOnGround = false;
		
		for (var i = 0; i < terrains.length; i++) {
			var current_terrain = terrains[i];
			
			var dx = current_terrain.centerX() - player.centerX();
			var dy = current_terrain.centerY() - player.centerY();
			
			var half_widths = player.halfWidth() + current_terrain.halfWidth();
			var half_heights = player.halfHeight() + current_terrain.halfHeight();
			
			if (Math.abs(dx) < half_widths && Math.abs(dy) < half_heights) {
				ox = half_widths - Math.abs(dx);
				oy = half_heights - Math.abs(dy);
				
				if (ox >= oy) {
					if (oy > 0) {
						player.y -= oy;
						player.vy = 0;
						player.isOnGround = true;
					} else {
						player.y += oy;
						player.vy *= -1;
					}
				} else {
					if (ox > 0) {
						player.x -= ox;
						player.vx = 0;
					} else {
						player.x += ox;
						player.vx = 0;
					}
				}
			}
		}
	}