private static int calcLight(int radius, int radiusSq, int distX,
			int distY, double dither, Color color) {
		int distCenterSq = distY * distY + distX * distX;
		if (distCenterSq > radiusSq) {
			return 0;
		}
		return toData(((double) radius / (double) (distCenterSq)), dither,
				color);
	}