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Thread: [CS3] [HELP] Questions concerning school project

  1. #1
    Junior Member
    Join Date
    Nov 2008
    Posts
    25

    [CS3] [HELP] Questions concerning school project

    Im taking an Internet Programming course focusing on beginner AS. For my final project i have to make a game, and so i decided to try my hand at a platform game, since Ive had interest in that for a long while. I decided to use backgrounds from the Metal Slug game series (taken from here:http://www.metalslugsprites.net/backgrounds/) .
    So my question is concerning where characters will be walking, since this is obviously not a tile-based game. I figured that I would have to make 2 layers for the background: One with the background image, and then on the other, I would draw where I want characters to be able to walk/jump/hit. I happened to come across this tutorial which supported my theory:http://www.gotoandplay.it/_articles/2003/10/bubble.php, but I still feel unsure. I guess Im a bit nervous about this, seeing as its my first time attempting such an endeavor.

    Another question I have is about animation. Do I have to make 2 sets of animations for characters, one for each direction? If that wasnt clear enough, I mean that do I have to make an animation for a character moving left and then another for it moving right? Or is there an easier way around that?

    I also have a question not pertaining to this project, but to the course. We recently had a mid-term where we had to modify a program. One of the things we had to do was make objects bounce off the sides of the stage. I didnt know how to do it, so I googled and found a few sites that mentioned it, but I couldnt get it to work.

    Here's my code. The code I tried to use for the stage wall bouncing is in comments.
    code:

    import flash.geom.ColorTransform;

    newBallButton.buttonMode =true;
    var ballArray:Array = new Array();
    var ballColor:uint;
    var speed:Number= 2;
    var newBallIndex:Number =0
    ballArray[newBallIndex] = new Ball();
    ballArray[newBallIndex].y=200;


    var timer:Timer = new Timer(100);
    timer.addEventListener(TimerEvent.TIMER,moveBall);
    timer.start();
    function moveBall(evt:TimerEvent):void{
    for (var i:Number=0;i<ballArray.length;i++) {
    if(i%2==0){
    ballArray[i].x += speed * 5;
    ballArray[i].y += speed * 5;
    }
    else{
    ballArray[i].x -= speed * 10;
    ballArray[i].y -= speed * 10;
    }
    }
    }


    //ballArray[newBallIndex].addEventListener(Event.ENTER_FRAME, bounceBall);
    //function bounceBall(event:Event):void{
    //if(ballArray[newBallIndex].x >= stage.stageWidth-ballArray[newBallIndex].width){
    //ballArray[newBallIndex].x *= -1;
    // }
    //if(ballArray[newBallIndex].x <= 0){
    //ballArray[newBallIndex].x *= -1;
    //}
    //if(ballArray[newBallIndex].y >= stage.stageHeight-ballArray[newBallIndex].height){
    //ballArray[newBallIndex].y *= -1;
    //}
    //if(ballArray[newBallIndex].y <= 0){
    //ballArray[newBallIndex].y *= -1;
    // }
    //}

    newBallButton.addEventListener(MouseEvent.MOUSE_UP ,newBall);
    function newBall(evt:MouseEvent):void{


    ballArray[newBallIndex] = new Ball();
    ballArray[newBallIndex].x = Math.random()*200;
    ballArray[newBallIndex].y = Math.random()*400;


    var newColorTransform:ColorTransform = new ColorTransform();
    newColorTransform.color = Math.random() * 0xffffff;
    ballArray[newBallIndex].transform.colorTransform = newColorTransform;

    addChild(ballArray[newBallIndex]);
    newBallIndex++;
    }



    The code I tried to use for the stage wall bouncing is in comments.
    What am I doing wrong? Im pretty sure its something simple..

    Thank you for your help, in advance.

  2. #2
    Senior Member
    Join Date
    Oct 2008
    Posts
    120
    for the animations thing, you can just flip the xscale, like:

    PHP Code:
    if(Key.isDown(68))
    {
         
    whatever._xscale 100;
         
    //stuff
    }
    if(
    Key.isDown(65))
    {
         
    whatever._xscale = -100;
         
    //stuff

    and what are you trying to do with that code? make a game like pong?
    cuz that code looks way overdone imo. It could be done a lot simpler than that.

  3. #3
    Student
    Join Date
    Apr 2001
    Location
    -
    Posts
    4,756
    for better readability:
    PHP Code:
    import flash.geom.ColorTransform;

    newBallButton.buttonMode =true;
    var 
    ballArray:Array = new Array();
    var 
    ballColor:uint
    var 
    speed:Number2;
    var 
    newBallIndex:Number =0
    ballArray
    [newBallIndex] = new Ball();
    ballArray[newBallIndex].y=200;

    var 
    timer:Timer = new Timer(100);
    timer.addEventListener(TimerEvent.TIMER,moveBall);  
    timer.start();
    function 
    moveBall(evt:TimerEvent):void{
        for (var 
    i:Number=0;i<ballArray.length;i++) {
        if(
    i%2==0){
           
    ballArray[i].+= speed 5;
           
    ballArray[i].+= speed 5;
            }
        else{
            
    ballArray[i].-= speed 10;
            
    ballArray[i].-= speed 10;
            }
         }
       }

    newBallButton.addEventListener(MouseEvent.MOUSE_UP  ,newBall);
    function 
    newBall(evt:MouseEvent):void{
        
    ballArray[newBallIndex] = new Ball();
        
    ballArray[newBallIndex].Math.random()*200;
        
    ballArray[newBallIndex].Math.random()*400;

        var 
    newColorTransform:ColorTransform = new ColorTransform();
        
    newColorTransform.color Math.random() * 0xffffff;
        
    ballArray[newBallIndex].transform.colorTransform newColorTransform;

        
    addChild(ballArray[newBallIndex]);
        
    newBallIndex++;


  4. #4
    Junior Member
    Join Date
    Nov 2008
    Posts
    25
    Thank you for the help.

    The code was from my midterm(has nothing to do with the game Im planning). Here's what we had to do:http://media.lehman.cuny.edu:16080/~...ow/BowWow.html

    After the midterm, my professor told us to finish what we didnt do. I was unable to get the balls to bounce off of the stage boundaries, because I had never done that before, and because he didnt teach us. I tried using examples that I found thru Google searching (thats the part of the code that I put in comments) but it didnt work properly. So I was just hoping that someone could see what the problem was, cuz I sure cant.

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