from random import *

def main():
  pic = makeEmptyPicture(400,400)
  for x in range(1,5):
    addRandomZigZag(pic)
  show(pic)
  crayons = [ red, green, blue, yellow, cyan, magenta, gray ]
  colorItIn(pic, crayons)
  repaint(pic)
  mirrorPicture(pic)
  repaint(pic)

def addRandomZigZag(pic):
  w= getWidth(pic)
  h= getHeight(pic)
  x= w/2
  y= h/2
  inside= true
  while inside:
    xNew= x + choice([-20,0,20])
    yNew= y + choice([-20,0,20])
    if xNew < 0 or xNew > w-1 or yNew < 0 or yNew > h-1:
      inside = false
    else:
      addLine(pic, x,y, xNew, yNew)
      x= xNew
      y= yNew

def colorItIn(pic, crayons):
  pixels = getPixels(pic)
  color = getColor(x, y)
  for y in range(0, getHeight(pic)):
    crayonDown = false
  for x in range(getWidth(pic), 0):
    if color is black:
      crayonDown = not crayonDown
    if crayonDown is crayonDown:
      setColor(x,y, crayons)
    elif crayonDown is crayonDown:
      setColor(x,y, crayons)

def mirrorPicture(pic):
  width = getWidth(pic)
  mirrorpoint = width/2
  for x in range(0, mirrorpoint):
    for y in range(0, getHeight(pic)):
      pleft= getPixel(pic, x, y)
      pright = getPixel(pic, width-x-1, y)
      setColor(pright, getColor(pleft))
  return pic