drawLine = function(img, x0, y0, x1, y1, colr)
	sign = function(a, b)
		if a < b then return 1
		return -1
	end function
	
	dx = abs(x1 - x0)
	sx = sign(x0, x1)
	
	dy = abs(y1 - y0)
	sy = sign(y0, y1)
	
	if dx > dy then
		err = dx
	else
		err = -dy
	end if
	err = floor(err / 2)
	
	while true
		img.setPixel x0, y0, colr
		if x0 == x1 and y0 == y1 then break
		e2 = err
		if e2 > -dx then
			err -= dy
			x0 += sx
		end if
		if e2 < dy then
			err += dx
			y0 += sy
		end if
	end while
end function

img= Image.create(320, 320)
drawLine img, 0, 0, 250, 300, color.red
gfx.clear
gfx.drawImage img, 0, 0