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Excersise Set 2

Here are some simple matching excersises to help you learn how to trace code.

Part 1 Answers
Match the problem to its solution

Problems
(A) Make the red values of all pixels equal zero. (B) Make the green values of all pixels equal zero. (C) Make both the red and blue values of all pixels equal 255. (D) Make both the green and blue values of all pixels equal 255. (E) Make the red, green and blue values of all pixels equal the average of the red, green and blue values for that pixel.

Solutions
(1)
def changeColorSquares(file):
  picture = makePicture(file)
  show(picture)

  for pixel in getPixels(picture):
    setRed(pixel, 255)
    setBlue(pixel, 255)

  repaint(picture)

(2)
def changeColorSquares(file):
  picture = makePicture(file)
  show(picture)

  for pixel in getPixels(picture):
    setGreen(pixel, 255)
    setBlue(pixel, 255)

  repaint(picture)

(3)
def changeColorSquares(file):
  picture = makePicture(file)
  show(picture)

  for pixel in getPixels(picture):
    setRed(pixel, 0)

  repaint(picture)

(4)
def changeColorSquares(file):
  picture = makePicture(file)
  show(picture)

  for pixel in getPixels(picture):
    r = getRed(pixel) 
    g = getGreen(pixel)
    b = getBlue(pixel)

    average = (r + g + b)/3
    new_color = makeColor( average, average, average )
    setColor(pixel, new_color)

  repaint(picture)

(5)
def changeColorSquares(file):
  picture = makePicture(file)
  show(picture)

  for pixel in getPixels(picture):
    setGreen(pixel, 0)

  repaint(picture)

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