def copy(targetX, flowerPicture, canvas):
  # targetX = 1
  for sourceX in range(1, getWidth(flowerPicture)):
    targetY = getHeight(canvas)-getHeight(flowerPicture)-5
    for sourceY in range(1, getHeight(flowerPicture)):
      px = getPixel(flowerPicture, sourceX, sourceY)
      cx = getPixel(canvas, targetX, targetY)
      setColor(cx, getColor(px))
      targetY = targetY + 1
    targetX = targetX + 1

def decreaseRed(pic):
  # print getPixels(pic) 
  for pixel in getPixels(pic):
    oldRed = getRed(pixel)    
    setRed(pixel, oldRed * 0.25)

def clearBlue(picture):
    for pixel in getPixels(picture):
        setBlue(pixel, 0)

def negative(picture):
   for px in getPixels(picture):
      red = getRed(px)
      green = getGreen(px)
      blue = getBlue(px)
      negColor = makeColor( 255-red, 255-green, 255-blue)
      setColor(px, negColor)

def createCollage():
  flower1 = makePicture(getMediaPath("flower1.jpg"))
  print flower1
  flower2 = makePicture(getMediaPath("flower2.jpg"))
  print flower2
  canvas = makePicture(getMediaPath("640x480.jpg"))
  print canvas

  #First picture, at left edge
  copy(1, flower1, canvas)
  """targetX = 1
  for sourceX in range(1, getWidth(flower1)):
    targetY = getHeight(canvas)-getHeight(flower1)-5
    for sourceY in range(1, getHeight(flower1)):
      px = getPixel(flower1, sourceX, sourceY)
      cx = getPixel(canvas, targetX, targetY)
      setColor(cx, getColor(px))
      targetY = targetY + 1
    targetX = targetX + 1"""

  #Second picture, 100 pixels over
  copy(100, flower2, canvas)
  """targetX = 100
  for sourceX in range(1, getWidth(flower2)):
    targetY = getHeight(canvas)-getHeight(flower2)-5
    for sourceY in range(1, getHeight(flower2)):
      px = getPixel(flower2, sourceX, sourceY)
      cx = getPixel(canvas, targetX, targetY)
      setColor(cx, getColor(px))
      targetY = targetY + 1
    targetX = targetX + 1"""

  #Third picture, flower1 negated
  negative(flower1)
  copy(200, flower1, canvas)
  """targetX = 200
  for sourceX in range(1, getWidth(flower1)):
    targetY = getHeight(canvas)-getHeight(flower1)-5
    for sourceY in range(1, getHeight(flower1)):
      px = getPixel(flower1, sourceX, sourceY)
      cx = getPixel(canvas, targetX, targetY)
      setColor(cx, getColor(px))
      targetY = targetY + 1
    targetX = targetX + 1"""

  #Fourth picture, flower2 with no blue
  clearBlue(flower2)
  copy(300, flower2, canvas)
  """targetX = 300
  for sourceX in range(1, getWidth(flower2)):
    targetY = getHeight(canvas)-getHeight(flower2)-5
    for sourceY in range(1, getHeight(flower2)):
      px = getPixel(flower2, sourceX, sourceY)
      cx = getPixel(canvas, targetX, targetY)
      setColor(cx, getColor(px))
      targetY = targetY + 1
    targetX = targetX + 1"""

  #Fifth picture, flower1, negated with decreased red
  decreaseRed(flower1)
  copy(400, flower1, canvas)
  """targetX = 400
  for sourceX in range(1, getWidth(flower1)):
    targetY = getHeight(canvas)-getHeight(flower1)-5
    for sourceY in range(1, getHeight(flower1)):
      px = getPixel(flower1, sourceX, sourceY)
      cx = getPixel(canvas, targetX, targetY)
      setColor(cx, getColor(px))
      targetY = targetY + 1
    targetX = targetX + 1"""
  show(canvas)
  return(canvas)