Modified Algorithm : DDA

This line drawing method is called a Digital Differential Analyzer or DDA for short.

public void lineDDA(int x0, int y0, int x1, int y1, Color color) {
	int pix = color.getRGB();
	int dy = y1 - y0;
	int dx = x1 - x0;
	float t = 0.5f; // offset for rounding
	raster.setPixel(pix, x0, y0);
	
	if (Math.abs(dx) > Math.abs(dy)) { // slope < 1
		float m = (float) dy / (float) dx; // compute slope
		t += y0;
		dx = (dx < 0) ? -1 : 1;
		m *= dx;
		while (x0 != x1) {
			x0 += dx; // step to next x value
			t += m; // add slope to y value
			raster.setPixel(pix, x0, (int) t);
		}
	} else { // slope >= 1
		float m = (float) dx / (float) dy; // compute slope
		t += x0;
		dy = (dy < 0) ? -1 : 1;
		m *= dy;
		while (y0 != y1) {
			y0 += dy; // step to next y value
			t += m; // add slope to x value
			raster.setPixel(pix, (int) t, y0);
		}
	}
}
 

Incorporating these changes into our previous lineImproved( ) algorithm gives the following result

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