Daily Python kata rendered with Drawbot

code_kata_eliheuer_01_02_16.py

# fork of -- https://gist.github.com/justvanrossum/19cf56af4ccb2477a868
# from http://dailydrawbot.tumblr.com/
#rendered with drawbot

# FREQUENCY = 1
# http://dailydrawbot.tumblr.com/post/135252661206/the-blob

# FREQUENCY = 2
# http://dailydrawbot.tumblr.com/post/135266061309/the-blob-2

def centerOval(pt, radiusX, radiusY):
    x, y = pt
    oval(x - radiusX, y - radiusY, 2 * radiusX, 2 * radiusY)

CANVAS = 512
RADIUS = 0.38 * CANVAS

STEPS = 13  # try 13
VIEWANGLE = radians(35)

FREQUENCY = 1
AMPLITUDE = 0.15

NFRAMES = 50

for frame in range(NFRAMES):
    newPage(CANVAS, CANVAS)
    frameDuration(1/20)
    fill(0.2)
    rect(0, 0, CANVAS, CANVAS)
    strokeWidth(0.8)
    fill(1)
    translate(CANVAS/2, CANVAS/2)
    for i in reversed(range(STEPS)):
        fill(1-i/STEPS, 1-i/STEPS, 1-i/STEPS)
        angle = pi * (i + 0.5) / STEPS
        r = RADIUS * sin(angle)
        waveAngle = FREQUENCY * (2 * pi * (i / STEPS + frame/NFRAMES))
        wave = 1 + AMPLITUDE * sin(waveAngle)
        save()
        translate(0, wave * cos(VIEWANGLE) * RADIUS * cos(angle))
        r = wave * r
        centerOval((0, 0), r, r * sin(VIEWANGLE))
        restore()

if NFRAMES > 20:
    saveImage("TheBlob-f%s.gif" % FREQUENCY)