# Recipe 45: Draw lines by setting pixels

def lineExample():
  pic = makePicture(pickAFile())
  new = verticalLines(pic)
  new2 = horizontalLines(new)
  show(new2)
  return new2

def horizontalLines(src):
  for y in range(1,getHeight(src),5):
    for x in range(1,getWidth(src)+1):
      setColor(getPixel(src,x,y),black)
  return src

def verticalLines(src):
  for x in range(1,getWidth(src),5):
    for y in range(1,getHeight(src)+1):
      setColor(getPixel(src,x,y),black)
  return src