def increaseBlue(picture):
  for p in getPixels(picture):
    newBlue = getBlue(p)*1.1
    if newBlue > 255:
      newBlue = 255
    setBlue(p,newBlue)
  return picture

def shuffleRGB(picture):
  for p in getPixels(picture):
    r = getRed(p)
    g = getGreen(p)
    b = getBlue(p)
    newColor = makeColor(g, b, r)
    setColor(p, newColor)
  return picture

def jellyfishOnBeach():
  jelly = makePicture(getMediaPath('jellyfish-small.jpg'))
  beach = makePicture(getMediaPath('beach.jpg'))
  for x in range(360,641):
    for y in range(1,401):
      jellyPixel = getPixel(jelly,x,y)
      beachPixel = getPixel(beach,x,y)
      jellyColor = getColor(jellyPixel)
      setColor(beachPixel,jellyColor)
  return beach

def drawFlag(width,height):
  canvas = makeEmptyPicture(width,height)
  stripeHeight = height/13
  blueUpperRight = [0,0]
  blueLowerLeft = [width/2,int(stripeHeight*7)]
  blueWidth = blueLowerLeft[0]-blueUpperRight[0]
  blueHeight = blueLowerLeft[1]-blueUpperRight[1]
  addRectFilled(canvas,
                blueUpperRight[0],blueUpperRight[1],
                blueWidth, blueHeight, blue)
  stripeLeftX = blueLowerLeft[0]
  stripeUpperLeftY = 0
  stripeWidth = width - blueLowerLeft[0]
  stripeUpperLeftX = stripeLeftX
  for i in range(7):
    if i%2:
      # 0 % 2 is zero, 1%2 is one, 2%2 is zero, etc.
      # this checks whether it's even or odd
      # so, if i%2 is zero, it's even, otherwise, it's odd
      # ergo, this block is used for odd values
      color = white
    else:
      color = red

    addRectFilled(canvas,
                  stripeUpperLeftX,
                  stripeUpperLeftY,
                  stripeWidth,
                  stripeHeight,
                  color)
    stripeUpperLeftY += stripeHeight

  # lower stripes
  stripeUpperLeftX = 0
  stripeWidth = width
  for i in range(6):
    if i%2:
      # red stripes 
      color = red
    else:
      # white stripes
      color = white
    addRectFilled(canvas,
                  stripeUpperLeftX,
                  stripeUpperLeftY,
                  stripeWidth,
                  stripeHeight,
                  color)
    stripeUpperLeftY += stripeHeight
  addRect(canvas,0,0, width,stripeUpperLeftY,black)
  evenStarsX,evenStarsY = 20,20
  starsWidth,starsHeight = blueWidth-40,blueHeight-40
  starsSize = 15
  evenStarsXDelta = starsWidth/5
  evenStarsYDelta = starsHeight/4
  oddStarsX = evenStarsX+evenStarsXDelta/2
  oddStarsY = evenStarsY+evenStarsYDelta/2

  for i in range(9):
    if not i%2:
      # even stars
      x = evenStarsX
      for j in range(6):
        drawStar(canvas,x,evenStarsY,starsSize)
        x += evenStarsXDelta
      evenStarsY += evenStarsYDelta
    else:
      x = oddStarsX
      for j in range(5):
        drawStar(canvas,x,oddStarsY,starsSize)
        x += evenStarsXDelta
      oddStarsY += evenStarsYDelta
  return canvas

def drawStar(picture,x,y,size):
  half = size/2
  halfhalf = half/2
  #addOval(picture, x-half,y-half,size,size,white)
  addLine(picture, x-half, y+half,
          x, y-half, white)
  addLine(picture, x, y-half,
          x+half, y+half, white)
  addLine(picture, x+half, y+half,
          x-half,y-halfhalf, white)
  addLine(picture, x-half, y-halfhalf, 
          x+half, y-halfhalf, white)
  addLine(picture, x+half,y-halfhalf,
          x-half, y+half, white)