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Spring 2005 Homework 5 Questions

Make a folder to put the frames in and put the path to that folder as input to your function: myMovie(r"C:\something or other\some folder you made") -Student1680

The requirements back in Fall of 2003 only called for 2 objects in motion. -Student1680

REMOVEDbfunction == additonal function You need three things in motion. So one approach could be to have 3 other functions that each added a moving object to a frame. Or perhaps you could have one function that copies a specified picture to a frame at a specified location that you would call 2 different ways. Plenty of other ways to do it, too. -Student1680

Some computers just have issues with moviemaker. You could try reducing the number of frames your program generates or you could try restarting your computer. If that doesn't help, try it on a friend's computer who's gotten it to work previously. -Student1680

Your myMovie function is supposed to generate the 30+ frames for your movie. Typically, it'll be a for loop for all the frames with a writePictureTo at the end of the loop. -Student1680

sourceX = 45
    for target in range(frame*3,frame*3+((200-45)/2)):
      sourceY = 25
      for targetY in range(frame*3,frame*3+((200-25)/2)):
         color = getColor(getPixels(me, int(sourceX), int(sourceY))))
         setColor(getPixels(canvas,targetX,targetY), color)
         sourceY = sourceY + 2
      sourceX = sourceX + 2

Fixed. REMOVED the color = ... line. You've got too many closing parenthesis. -Student1680

getPixels??? getPixel! -Student1680

sourceX = 0
    for target in range(frame*3, frame*3+((105-0)/2)):
      sourceY = 5
      for targetY in range(frame*3, frame*3+((85-5)/2)):
         color = getColor(getPixel(me, int(sourceX), int(sourceY)))
         setColor(getPixel(canvas,targetX,targetY), color)
         sourceY = sourceY + 2
      sourceX = sourceX + 2

You're starting sourceX off at 0. That column doesn't exist, it starts off at 1. I would STRONGLY suggest writing your loops so that the for loops auto-increment the source variables and that the target variables are incremented by the targetX = targetX + 1 type of stuff with an if block checking to make sure the target pixel exists before you write to it. That way an out of bounds type of error will be impossible. -Student1680

Can't exactly say without reading the code. What might have happened is that things like quotation marks and apostrophes got replaced with formatted curved appostrophes by powerpoint or a space got dropped or the code you pasted used a variable that you weren't. Like I said, I can't really say without REMOVED information. -Student1680

You have 3 options. You can generate the movie with movie maker, or you can click on a few images individually to see if it's kind of doing what you want it to. However, if you're on windows XP, here's a cheap trick: you can view the folder contents so that all the folder icons are thumbnails and they're all in a single row (I think the option for it is called "filmstrip"). Click the first image and hold down the right arrow key, and it'll sort of give you an animated effect. -Student1680

Yay, someone that actually came to my breakout! i was the variable that I used for the frame number and 20 was the maximum number of frames. so that first part (i + 0.0)/20 is the percentage of the way through the movie this frame is, so it'll be a decimal number between 0 and 1. If you just did i/20, then it would chop off the decimal places which is A Bad Thing, so that's what the 0.0 is for. Then we're multiplying that by the final x coordinate where we want our picture to end up by the end of the movie so that it makes it look like the picture is moving at a constant rate from the left side of the canvas to the right side of the canvas. -Student1680

All I can think of is that the directory possibly doesn't exist. -Student1680

Composited image == any old JPEG -Student1680

Make sure you start JES while you're connected to the internet. If that doesn't change anything, then try the crash and burn turnin method or contact a TA about it. -Student1680

  for frame in range(1,100):
    printNow("Frame number:"+str(frame))
    sourceX=1
    for targetX in range(frame*5-5, getWidth(turtle)+frame*5-4):
       sourceY=1
       for targetY in range(frame*5-5, getHeight(turtle)+frame*5-4):
         if targetY < getHeight(canvas) and targetX < getWidth(canvas):
             color=getColor(getPixel(turtle,int(sourceX),int(sourceY)))
             setColor(getPixel(canvas, targetX, targetY), color) 
             sourceY=sourceY+1
       sourceX=sourceX+1

You didn't check to make sure it didn't go off the top or the left. You need to have a 1 <= targetX, etc. in there. -Student1680

  for frame in range(1,100):
    printNow("Frame number:"+str(frame))
    sourceX=1
    for targetX in range(frame*5-5, getWidth(turtle)+frame*5-4):
       sourceY=1
       for targetY in range(frame*5-5, getHeight(turtle)+frame*5-4):
         if targetY < getHeight(canvas) and targetX < getWidth(canvas):
            color=getColor(getPixel(turtle,int(sourceX),int(sourceY)))
            setColor(getPixel(canvas, targetX, targetY), color) 
            sourceY=sourceY+1
      sourceX=sourceX+1

Count the spaces on that line. Compare it to the block of code it's supposed to be in. -Student1680

Take the code that puts your 3rd image on the canvas and put an if block around. Something like if frame > 20:   #code to place your moving object here... -Student1680

Scroll up! ;) -Student1680

You cannot turn in an assignment without an internet connection. You could work on it without an internet connection and then use the crash and burn method when you do happen to get to a computer with a connection that doesn't necessarily have JES on it, though (like the library). -Student1680

What I would do is create a new folder on your desktop called something like "Movie Frames". Then in the command area, type... >>> dir = pickAFolder() Then pick that folder. Then to call your function... >>> myMovie(dir) Then if you did everything correctly, your frames will appear in that folder on your desktop. -Student1680

No, you do not create the folder from inside the program. -Student1680

I would try what I mentioned directoy above, that should fix this error. -Student1680

Yes, writeFrame(num, dir, framepict) can be your separate function. The minimum allowed framerate is 10 frames per second. So when we're grading these, we'll just be looking to see if your program generated atleast 30 frames. You don't have to actually generate the movie, just the frames. And yes, you only turn in your JES function (with the pictures you used to generate it, of course). -Student1680

Are you sure you ran setMediaPath() on your Homwork5 folder first? -Student1680

sourceX=1
    for targetX in range(frame☆5-5, getWidth(turtle)+(frame☆5)-4):
       sourceY=1
       for targetY in range(frame☆5-5, getHeight(turtle)+(frame☆5)-4):
         if targetY < getHeight(canvas) and targetX < getWidth(canvas):
            color=getColor(getPixel(turtle,int(sourceX),int(sourceY)))
        ->  setColor(getPixel(canvas, targetX, targetY), color) 
            sourceY=sourceY+1
       sourceX=sourceX+1

Looks like targetX and targetY spilled off the edge of the canvas. You could surround this line with an if statement specifying that the coordinates (targetX, targetY) are actually on the canvas. Something like if 1 <= targetX <= getWidth(canvas): and the same goes for targetY. -Student1680

    sourceX=1
    for targetX in range(frame*5-5, getWidth(turtle)+frame*5-4):
         sourceY=1
         for targetY in range(frame☆5-5, getHeight(turtle)+(frame*5)-4):
           if 1 <= targetX <= getWidth(canvas) and 1 <= targetY <= getHeight(canvas):
              color=getColor(getPixel(turtle,int(sourceX),int(sourceY)))
              setColor(getPixel(canvas, targetX, targetY), color) 
              sourceY=sourceY+1
         sourceX=sourceX+1

You don't want the sourceY = sourceY + 1 to be conditional. unindent that once. Since you're using the target pointers as your auto-incremented variable by the for loop, then you need to add another check to make sure that the sourceX and sourceY are actually existant on the source canvas (although it would probably be better to logically reason this out with your equations involving frame) -Student1680

Pick out a few images and compare them. -Student1680

Links to this Page

• Homeworks-Spring 2005 last edited on 31 March 2005 at 4:44 pm by lawn-199-77-210-82.lawn.gatech.edu
• Homeworks-Spring-2005 last edited on 29 January 2006 at 11:05 pm by r80h18.res.gatech.edu