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RGB Helix

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import math
from gridmas import *
import random

name = "RGB Helix"
author = "Ciaran"

twist_dx = RangeAttr("twist speed", 0.01, 0.001, 0.2, 0.001)
rotate_amount = RangeAttr("Rotate speed", 0.01, 0.001, 0.1, 0.001)
twist_dir = 1
twist_amount = -random.randrange(-8, 8)
speed = 2
offset = random.random() * math.pi * 2
color_offset = random.random()

def draw():
    global twist_amount,twist_dir, offset, color_offset

    for pixel in pixels():

        modified_angle = (pixel.a + pixel.z * twist_amount + offset * speed) % (math.pi * 2)

        a = round((modified_angle) / math.pi)

        hue = a / 2
        pixel.set_color(Color.hsl((hue + color_offset) % 1, 1, 0.5))


    offset = (offset + rotate_amount.get()) % (math.pi * 2)

    color_offset = (0.00027 + color_offset) % 1

    twist_amount += twist_dir * twist_dx.get()
    if twist_amount > 10:
        twist_dir = -1
    elif twist_amount < -10:
        twist_dir = 1