import time;

def ufoHeightAt(f):
  return getHeight(baseImage)-getHeight(ufoImage)-f-1



# Create/load the initial images
ufoImage = makePicture("/Users/ibarland/109/Lectures/lect01-ufo/ufo.jpeg")

# The ufo base by itself:
baseImage1 = makePicture("/Users/ibarland/109/Lectures/lect01-ufo/muse.jpeg")

# The ufo base, with space above it:
baseImage = makeEmptyPicture( getWidth(baseImage1), getHeight(baseImage1)+getHeight(ufoImage), makeColor(0,0,255))
copyInto(baseImage1, baseImage, 0, getHeight(ufoImage))



xOffset = (getWidth(baseImage)/2 - getWidth(ufoImage)/2)
  


def animateRocketFrom( startFrameNum, stopFrameNum):
  currFrameNum = startFrameNum

  currFrame = duplicatePicture(baseImage)
  show(currFrame)
  while (currFrameNum < stopFrameNum):
    copyInto(baseImage,currFrame,0,0)
    copyInto(ufoImage, currFrame, xOffset, ufoHeightAt(currFrameNum))
    repaint(currFrame)
    time.sleep(1.0/24.0)
    currFrameNum = currFrameNum + 1

  

animateRocketFrom( 20, 102)