points.py 文件源码

def spiral(freq=1.0, center_x=0.0, center_y=0.0, range_x=1.0, range_y=1.0, width=1.0, height=1.0, **kwargs):
    """
    """

    kink = random.random() * 5.0 - 2.5

    x = []
    y = []

    count = freq * freq

    for i in range(count):
        fract = i / count

        degrees = fract * 360.0 * math.radians(1) * kink

        x.append((center_x + math.sin(degrees) * fract * range_x) % width)
        y.append((center_y + math.cos(degrees) * fract * range_y) % height)

    return x, y