Welcome to CS1315. Click on the python to add comments. Looking for the book? They have it at the Engineer's Bookstore at 748 Marietta St NW. Here is there website: http://www.engrbookstore.com/ - Monica
	Hotspots: Slides and Code • TA Corner • Comments? • Announcements • FAQ • Static Webspace

proto-Pong, the bouncing/color-changing square ball code

def pong():
  x = 0 # x position of ball
  y = 0 # y position of ball
  w = 10 # width of ball
  h = 10 # height of ball
  lr = 1 # left-right direction of movement. (+1 = l-to-right, -1 = r-to-left)
  color = red # Color of ball

  for frameNum in range(1, 100):
    picture = makeEmptyPicture(640, 480)
    addRectFilled(picture, x, y, w, h, color)

    # If we get to the RHS, going left-to-right, change direction and change color
    if x >= getWidth(picture) and lr == 1:
      lr = -1
      color = blue

    x = x + (10*lr) # Increments or decrements x depending on lr direction
    y = y + 2 # Keep going down by incrementing y whether l-to-r or r-to-l
    writePictureTo(picture, filename(frameNum))

def filename(n):
  if n < 10:
    stem = "pong0"
  else:
    stem = "pong"
  return getMediaPath(stem + str(n) + ".jpg")

Link to this Page

• Spring 2007 materials last edited on 21 August 2007 at 10:44 pm by user-1121vkp.dsl.mindspring.com