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def line(x0, y0, x1, y1, color):
    dx = abs(x1 - x0)    # distance to travel in X
    dy = abs(y1 - y0)    # distance to travel in Y

    if x0 < x1:
        ix = 1           # x will increase at each step
    else:
        ix = -1          # x will decrease at each step

    if y0 < y1:
        iy = 1           # y will increase at each step
    else:
        iy = -1          # y will decrease at each step

    e = 0                # Current error 

    for i in range(dx + dy):
        draw_pixel(x0, y0, color)
        e1 = e + dy
        e2 = e - dx
        if abs(e1) < abs(e2):
            # Error will be smaller moving on X
            x0 += ix
            e = e1
        else:
            # Error will be smaller moving on Y
            y0 += iy
            e = e2