Let's Make it Work!

Problem: lineSimple( ) does not give satisfactory results for slopes > 1

Solution: symmetry

public void lineImproved(int x0, int y0, int x1, int y1, Color color) {
	int pix = color.getRGB();
	int dx = x1 - x0;
	int dy = y1 - y0;
	raster.setPixel(pix, x0, y0);
	if (Math.abs(dx) > Math.abs(dy)) { // slope < 1
 		float m = (float) dy / (float) dx; // compute slope
		float b = y0 - m*x0;
 		dx = (dx < 0) ? -1 : 1;

		while (x0 != x1) {
 			x0 += dx;
			raster.setPixel(pix, x0, Math.round(m*x0 + b));
		}
	} else	if (dy != 0) { // slope >= 1
		float m = (float) dx / (float) dy; // compute slope
		float b = x0 - m*y0;
		dy = (dy < 0) ? -1 : 1;
		while (y0 != y1) {
			y0 += dy;
			raster.setPixel(pix, Math.round(m*y0 + b), y0);
		}
	}
}