# Assignment One Ellette Cruden 12077709

file=pickAFile()
picture = makePicture(file)
original = duplicatePicture(picture)
undoPic = picture
 # request sting then have to come up with "if" statements
 # eg. if request is m then run monochrome


def lighten(picture):
  for px in getPixels(picture):
    color = getColor (px)
    color = makeLighter (color)
    setColor(px, color)
  repaint(picture)

def darken(picture):
  for px in getPixels(picture):
    color = getColor (px)
    color = makeDarker (color)
    setColor(px,color)
  repaint(picture)

def monochrome(picture):
  for px in getPixels(picture):
    value= (getRed(px) + getGreen(px) + getBlue(px))/3
    setRed(px, value)
    setGreen(px, value)
    setBlue(px, value)
  repaint(picture)

def undo(picture):
    #duplicatePicture(picture)
  global undoPic
  picture = undoPic
  repaint(picture)

def reset(picture):
  picture = original
  repaint(picture)

def quit():
 quit

#The following is the picture modifications happening;

def render():
 while true:
   global picture
   global undoPic
   selection = requestString("*** Picture Modifications ***\n"                  #This is info box
    "m - make monochrome (black-and-white image)\n"
    "l - make the image Lighter\n"
    "d - make the image Darker\n"
    "u - undo\n"
    "o - reset the picture to the Original\n"
    "q - quit\n\n"
    "Choice:\b")
   if selection == "m":
    undoPic = picture
    monochrome(picture)
   elif selection == "d":
    undoPic = picture
    darken(picture)
   elif selection == "l":
    undoPic = picture
    lighten(picture)
   elif selection == "u":
    picture = undoPic
    repaint(picture)
   elif selection == "o":
    reset(picture)
   elif selection == "q":
    printNow("Program Quit")
    break



def open():
 global picture
 show(picture)
 render()

open()