Untitled

while(y >= x) {
		set_pixel(picture, x, y, color);
		if (d >= 2 * x) {
			d = d - 2 * x - 1;			
			x = x + 1;
		}
		else if (d <= 2 * (RAYON - y)) {
			d = d + 2 * y - 1;
			y = y - 1;
		} else {
			d = d + 2 * (y - x - 1);
			y = y - 1;
			x = x + 1;
		}
	}