SlideShow Code

#Purpose: This program will play a slide show of 4 slides
# The slides will appear on one large canvas one at a time,
# from left to right, with previous slides remaining in the
# picture after new ones are added.
# An appropriate narration for each slide will play after the
# slide appears
# until the time when the next slide appears.
# The narration will be blended with selected music.

import time

#This function mixes two sounds.
def makeMix(sound1, sound2, mixValue1, mixValue2):
  newLength = min(getLength(sound1),getLength(sound2))
  newSound = makeEmptySound(newLength)
  for index in range(0,newLength):
    sample1 = getSampleValueAt(sound1,index)
    sample2 = getSampleValueAt(sound2,index)
    newSample = mixValue1*sample1 + mixValue2*sample2
    setSampleValueAt(newSound,index,newSample)
  return newSound

#This function shrinks an image. 
def shrink (source):
  # set up target picture
  target = makeEmptyPicture( getWidth(source)/2, getHeight(source)/2)
  # do the actual copying
  sourceX = 0
  for targetX in range (0, getWidth(source)/2):
    sourceY = 0
    for targetY in range (0, getHeight(source)/2):
      color = getColor (getPixel (source, sourceX, sourceY))
      setColor (getPixel (target, targetX, targetY), color)
      sourceY = sourceY + 2
    sourceX = sourceX + 2
  return (target)   
 
#The main function
def slideShow():
  # Create empty canvas
  canvas = makeEmptyPicture(1929, 240)
 
  #The four images
  greece1 = makePicture(getMediaPath("greece.jpg"))
  pic1 = shrink(greece1)
  pic2 = makePicture(getMediaPath ("waikiki.jpg"))
  m3 = makePicture(getMediaPath ("moon-surface.jpg"))
  pic3 = shrink(m3)
  pic4 = makePicture(getMediaPath ("caterpillar.jpg"))

  #The four narrations
  Narration1 = makeSound(getMediaPath("Clip1.wav"))
  Narration2 = makeSound(getMediaPath("Clip2.wav"))
  Narration3 = makeSound(getMediaPath("Clip3.wav"))
  Narration4 = makeSound(getMediaPath("Clip4.wav"))
 
  #The four background instrumentals
  GreeceSound = makeSound(getMediaPath("Compatibility 30.wav"))
  WaikikiSound = makeSound(getMediaPath("One Clear Moment 30.wav"))
  SpaceSound = makeSound(getMediaPath("Disappearing_Acts_30.wav"))
  EvilSound = makeSound(getMediaPath("Darkness Falls 30.wav"))

  #The blended sounds
  GreeceAudio = makeMix(GreeceSound, Narration1, .25, .75)
  WaikikiAudio = makeMix(WaikikiSound, Narration2, .25, 1)
  SpaceAudio = makeMix(SpaceSound, Narration3, .25, 1)
  EvilAudio = makeMix(EvilSound, Narration4, .25, 1)
 
  checkTime = false
 
  #copying the images into the canvas
 
  t0 = time.clock()
  copyInto (pic1, canvas, 320, 20)
  if (checkTime):
    print time.clock() - t0, "seconds process time for copy 1"
  repaint (canvas)
  blockingPlay (GreeceAudio)
 
  t0 = time.clock()
  copyInto (pic2, canvas, 640, 0)
  if (checkTime):
    print time.clock() - t0, "seconds process time for copy 1"
  repaint (canvas)
  blockingPlay (WaikikiAudio) 
 
  t0 = time.clock()
  copyInto (pic3, canvas, 960, 0)
  if (checkTime):
    print time.clock() - t0, "seconds process time for copy 1"
  repaint (canvas)
  blockingPlay (SpaceAudio) 
 
  t0 = time.clock()
  copyInto (pic4, canvas, 1280, 45)
  if (checkTime):
    print time.clock() - t0, "seconds process time for copy 1" 
  repaint (canvas)
  blockingPlay (EvilAudio)