justvanrossum

# Slightly modified from
#   https://twitter.com/petrvanblokland/status/860610270410018817
# by Petr van Blokland @petrvanblokland

def drawSierpinskiSquare(px, py, w, maxW, maxH):
    if w < 1:
        return
    for x in range(3):
        for y in range(3):
            if x == 1 and y == 1:

justvanrossum

# http://dailydrawbot.tumblr.com/post/160078796339/lissajous-grid
# remade from https://twitter.com/fermatslibrary/status/857580490425020416

def lissajous(a, b, phase, radius):
    numSteps = 340
    points = []
    for i in range(numSteps):
        angle = 2 * pi * i / numSteps
        x = radius * sin(a * angle + phase)
        y = -radius * sin(b * angle)

justvanrossum

# Result:
# http://dailydrawbot.tumblr.com/post/150807743869/growing-circles

def circle(pt, radius):
    diameter = 2 * radius
    x, y = pt
    oval(x - radius, y - radius, diameter, diameter)

nFrames = 50
canvasSize = 500

justvanrossum

# http://dailydrawbot.tumblr.com/post/143801148619/square-vs-lozenge

def rotatedSquare(x, y, squareSize, angle):
    offsetSin = squareSize * sin(radians(angle))
    save()
    translate(x + offsetSin, 0)
    rotate(angle)
    rect(0, 0, squareSize, squareSize)
    restore()

justvanrossum

# http://dailydrawbot.tumblr.com/post/141565208389/oscilloscope-lissajous

canvasSize = 500
nFrames = 20
nSteps = 20
radius = 195
nEchoes = 20
nScopeLines = 10
xFrequency = 3
yFrequency = 4

justvanrossum

# nCirclesH = 18; nCirclesV = 6:
#   http://dailydrawbot.tumblr.com/post/138985675364/psychodonut-2
# nCirclesH = 38; nCirclesV = 28:
#   http://dailydrawbot.tumblr.com/post/139047595845/psychodonut-3

def project(x, y, innerR, outerR, phase):
    # convert from "donut space" to normal space
    angle = 2 * pi * x
    f = (cos(phase + pi * y) + 1) / 2
    R = innerR + f * (outerR - innerR)

justvanrossum

# This borrows heavily from:
#   http://jsfiddle.net/Rebug/5uLr7s6o/
#
# Resulting gif:
#   http://dailydrawbot.tumblr.com/post/134989689114/an-archimedean-spherical-spiral

import math
import colorsys

def circle(pt, radius):

justvanrossum

# http://dailydrawbot.tumblr.com/post/136811506080/circles-after-victor-vasarely-source-code
#
# Based on works by Victor Vasarely
# https://s-media-cache-ak0.pinimg.com/originals/a6/df/1f/a6df1fc5d2dd07d79a44c3aea5172b59.jpg
# https://s-media-cache-ak0.pinimg.com/736x/1e/38/82/1e38820f1304c8750de216a31a5f5abe.jpg
# http://interiorator.com/wp-content/uploads/2013/07/Vasarely-01.jpg

def circle(pt, radius):
    diameter = 2 * radius
    x, y = pt

justvanrossum

# Generate a jellyfish-like pulsating blobby animation.

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

justvanrossum

# A moving tribute to Ellsworth Kelly's "Seine" (1951).

from random import seed  # seed() allows us to get repeatable pseudo-noise

def expandGrid(pixels):
    assert len(pixels) % 2
    mid = len(pixels) // 2
    midColumn = pixels[mid]
    pixels.insert(mid + 1, list(midColumn))
    pixels.insert(mid + 0, list(midColumn))