DrawBot: Generate a jellyfish-like pulsating blobby animation.

Jellyfish.py

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from random import seed

def varyPoint(pt, radius, phase):

    x, y = pt

    dx = radius * cos(phase)

    dy = radius * sin(phase)

    return x + dx, y + dy

def drawBlob(blobPhase, blobRadius):

    points = []  # list of off curve points forming the blob.

    for i in range(numBlobPoints):

        a = 2 * pi * i / numBlobPoints

        x = blobRadius * cos(a)

        y = blobRadius * sin(a)

        rPhase, rSign = randomPhases[i]

        points.append(varyPoint((x, y), 0.2 * blobRadius, rPhase + rSign * 2 * pi * blobPhase))


    points.append(None)

    bezPath = BezierPath()

    bezPath.qCurveTo(*points)

    bezPath.closePath()

    drawPath(bezPath)

seed(0) # Ok ok, make this animation predictable.

numBlobPoints = 5

randomPhases = [(2 * pi * random(), choice([-1, 1])) for i in range(numBlobPoints)] canvasSize = 500

nBlobs = 24

nFrames = 95

for frame in range(nFrames):

    framePhase = frame / nFrames

    newPage(canvasSize, canvasSize)

    frameDuration(1/20)

    fill(0)

    rect(0, 0, canvasSize, canvasSize)

    translate(canvasSize/2, canvasSize/2)

    strokeWidth(2)

    stroke(1)

    fill(None)

    for i in range(nBlobs):

        blobPhase = i / nBlobs

        radius = 5 + i * 10

        drawBlob(framePhase + blobPhase * 0.75, radius)

saveImage("Jellyfish.gif")