def flipDiagonal():
  file = pickAFile()
  pict = makePicture (file)

  # get the width, height and midwid, midhgt
  wid = getWidth (pict)
  hgt = getHeight(pict)
  pict1 = makeEmptyPicture(hgt,wid)

  # flip along the diagonal
  for x in range(1,wid):
    for y in range(1,hgt):
      originalPixel = getPixel(pict, x, y)
      newPixel = getPixel(pict1, y, x)
      c = getColor(originalPixel)
      setColor(newPixel,c)

  show (pict)
  show (pict1)

def mirrorit():
  file = pickAFile()
  pict = makePicture (file)

  # get the width, height and midwid, midhgt
  wid = getWidth (pict)
  hgt = getHeight(pict)
  midwid=wid/2
  midhgt = hgt / 2
  print wid, hgt, midwid, midhgt
 
  # mirror the upper right corner
  for y in range(1,midhgt):
    for xOffset in range(1,midwid):
      pright = getPixel(pict, xOffset+midwid,y)
      pleft = getPixel(pict, midwid-xOffset,y)
      c = getColor(pleft)
      setColor(pright,c)

  # mirror the lower left coner
  for yOffset in range(1,midhgt):
    for x in range(1,midwid):
      pbottom = getPixel(pict, x, yOffset+midhgt)
      ptop = getPixel(pict, x, midhgt-yOffset)
      c = getColor(ptop)
      setColor(pbottom,c)

  # mirror the lower right coner
  for yOffset in range(1,midhgt):
    for xOffset in range(1,midwid):
      plrc = getPixel(pict, xOffset+midwid, yOffset+midhgt)
      pulc = getPixel(pict, midwid-xOffset, midhgt-yOffset)
      c = getColor(pulc)
      setColor(plrc,c)

  show (pict)