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def hw2():
  buffy=makePicture(getMediaPath("newbuffyelephant.jpg"))
  canvas=makePicture(getMediaPath("7inX95in.jpg"))

#picture 1 at left edge
  #targetX=1
  for X in range (1, getWidth(buffy)):
    #targetY= (getHeight(canvas)- getHeight(buffy))
    for Y in range (1,getHeight(buffy)):
      px=getPixel(buffy, X, Y)
      cx=getPixel(canvas, X, Y)
      setColor(cx,getColor(px))
      #targetY=targetY+1
    #targetX=targetX+1

#picture 2, 126 pixels over
  greyscale(buffy)
  targetX= 126
  for sourceX in range (1, getWidth(buffy)):
    targetY=5
   #targetY=getHeight(canvas) - getHeight(buffy)
    for sourceY in range (1,getHeight(buffy)):
      px=getPixel(buffy,sourceX, sourceY)
      cx=getPixel(canvas, targetX, targetY)
      setColor(cx,getColor(px))
      targetY=targetY+1
    targetX=targetX+1

#picture 3, 172 pixels down
  reduceGreen(buffy)
  targetX= 1
  for sourceX in range (1, getWidth(buffy)):
    targetY=172 
    targetY=getHeight(canvas) - getHeight(buffy)
    for sourceY in range (1,getHeight(buffy)):
      px=getPixel(buffy,sourceX, sourceY)
      cx=getPixel(canvas, targetX, targetY)
      setColor(cx,getColor(px))
      targetY=targetY+1
    targetX=targetX+1

#picture 4, 126 pixels over, 172 pixels down
  reduceRed(buffy)
  targetX= 126
  for sourceX in range (1, getWidth(buffy)):
    targetY=172
    targetY=getHeight(canvas) - getHeight(buffy)
    for sourceY in range (1,getHeight(buffy)):
      px=getPixel(buffy,sourceX, sourceY)
      cx=getPixel(canvas, targetX, targetY)
      setColor(cx,getColor(px))
      targetY=targetY+1
    targetX=targetX+1
  mirrorVertical(canvas)
  negative(canvas)
  show(canvas)
  writePictureTo(canvas,"collage.jpg")
  return(canvas)


#picture functions
def negative(picture):
  for x in range (252,504):
    for y in range (1,684):
      print y
      p=getPixel(picture, x, y)
      r=getRed(p)
      g=getGreen(p)
      b=getBlue(p)
      negColor=makeColor(255-r, 255-g, 255-b)
      setColor(p, negColor)

def greyscale(picture):
  for p in getPixels(picture):
    x = (getRed(p) + getGreen(p) + getBlue(p))/3
    setColor(p,makeColor(x,x,x))

def reduceGreen(picture):
  for p in getPixels(picture):
    value=getGreen(p)
    setGreen(p,value*0.7)

def reduceRed(picture):
  for p in getPixels(picture):
    value=getRed(p)
    setRed(p,value*0.5)

def mirrorVertical(picture):
  mirrorpoint=252
  for y in range (1, getHeight(picture)):
    for xOffset in range (1, mirrorpoint):
      pright=getPixel(picture, xOffset+mirrorpoint, y)
      pleft=getPixel(picture, mirrorpoint-xOffset, y)
      c=getColor(pleft)
      setColor(pright, c)