Score counter in AS3
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Thread: Score counter in AS3

  1. #1
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    Question Score counter in AS3

    Hi everyone,

    The game I'm making is a shooter: alienships fly across the screen and when I click them, they die.

    I want to have a dynamic text that keeps score of the number of ships I kill, but I'm not managing to do it.

    I have a "Main class" and an "Alienship class" in my game. This code is in the "Alienship class":

    function Alienship():void
    {
    addEventListener(MouseEvent.CLICK,whenclick);
    }

    private function whenclick(e:MouseEvent)
    {
    trace("You're dead\n");
    parent.removeChild(this);
    }

    It removes the alienship off the screen. But how can I have a variable that increments on each killing?

    Thanks

    Chiapa

  2. #2
    Senior Member Steven FN's Avatar
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    I would just add a "score" variable to the Main class and then increment score on "whenclick" with either: score++; OR score += scoreIncrement;

  3. #3
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    Hi steven, thanks for your reply

    problem is, if I do that the score will increment each time I shoot, and not each time I shoot a spaceship.

    Sorry, I tried doing that in the class Spaceship but the score is always one, each time I shoot the spaceship, because it's initialized for each spaceship as score:int = 0;

    Can you help me, please?

  4. #4
    Senior Member Steven FN's Avatar
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    Well the score variable should only be initialized once preferably in the Main Class, like you have score:int = 0;

    Instead of using whenClick, just add the score increment code to the AS that handles the spaceship click. I don't know all your code, but the principle is the same. Initialize score and then increment on hit. Just add score increment to alienship event listener.

  5. #5
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    Well, the event listener is in the class "Spaceship", not in "Main", and therefore I can't use that variable in the class Spaceship (or I don't know how to)

    The code:

    Two classes: Main and Nave (meaning Spaceship);

    -------------MAIN-------------------
    package
    {
    import flash.display.MovieClip;
    import flash.events.MouseEvent;
    import flash.ui.Mouse;
    import flash.events.TimerEvent;
    import flash.utils.Timer;
    import flash.events.Event;
    import flash.media.Sound;
    import flash.net.*;
    import flash.media.SoundChannel;

    public class Main extends MovieClip
    {
    var total:int = 200;
    var naves = new Array;
    var tempo:Timer;
    var tempo2:Timer;

    var pontos:int = 0;
    var tempojogo:Timer = new Timer(1000,1);
    var musica_fundo:Sound = new Sound();
    var tiro:Sound = new Sound();

    function Main():void
    {
    play_btn.addEventListener(MouseEvent.CLICK, jogar);

    function jogar(evt:MouseEvent):void
    {
    if (currentFrame == 1)
    {
    gotoAndStop(totalFrames);
    }
    else

    Mouse.hide();
    stage.addEventListener(MouseEvent.MOUSE_MOVE,mexe_ mira);
    stage.addEventListener(MouseEvent.CLICK,som);

    init_naves();
    tempo = new Timer(700,total);
    tempo.addEventListener(TimerEvent.TIMER,voa);
    tempo.start();

    tempo2 = new Timer(900,total);
    tempo2.addEventListener(TimerEvent.TIMER,voa2);
    tempo2.start();

    tempojogo.addEventListener(TimerEvent.TIMER,contad or);
    tempojogo.start();
    tiro.load(new URLRequest("SFX/tiro4mp.mp3"));
    }
    }

    function som(event:MouseEvent)
    {
    tiro.play(0);

    }

    function contador(event:TimerEvent)
    {
    contador_txt.text = String(tempojogo.currentCount);
    }

    private function voa(e:TimerEvent):void
    {
    var nave = naves.pop();
    nave.voa();
    }

    private function voa2(e:TimerEvent):void
    {
    var nave = naves.pop();
    nave.voa2();
    }

    private function init_naves():void
    {
    var nave1;
    var nave2;

    for (var i = 0; i < total; i++)
    {
    nave1 = new Nave ;
    nave1.x = -30;
    nave1.y = Math.floor(Math.random() * this.stage.stageHeight);

    this.addChild(nave1);
    naves.push(nave1);
    }

    musica_fundo.load(new URLRequest("Musica/Carmina.mp3"));
    musica_fundo.play();
    }

    private function mexe_mira(event:MouseEvent)
    {
    Mouse.hide();
    mira.x = mouseX;
    mira.y = mouseY;
    }
    }
    }
    --------------------------------------
    -------------NAVE-------------------

    package
    {
    import flash.display.MovieClip;
    import flash.events.*;
    import flash.utils.Timer;
    import flash.media.Sound;
    import flash.net.*;
    import flash.media.SoundChannel;

    public class Nave extends MovieClip
    {
    var speed_x:int = 10;
    var speed_x2:int = 12;
    var speed_y:int = 2;
    var speed_y2:int = -2;
    // var pontos:int = 0;

    function Nave():void
    {
    this.addEventListener(MouseEvent.CLICK, contapontos);
    }

    function contapontos(e:MouseEvent):void
    {
    // pontos = pontos + 1;
    // trace(pontos);
    }

    private function quandoClique(e:MouseEvent)
    {
    trace("Já foste!\n");
    parent.removeChild(this);

    }

    public function voa():void
    {
    this.addEventListener(Event.ENTER_FRAME, passa);
    addEventListener(MouseEvent.CLICK,quandoClique);
    }

    public function voa2():void
    {
    this.addEventListener(Event.ENTER_FRAME, passa2);
    addEventListener(MouseEvent.CLICK,quandoClique);
    }

    private function quandoFrame(e:Event)
    {
    x += speed_x;
    y += speed_y;
    }

    private function passa(e:Event):void
    {
    this.x= (this.x)+speed_x;
    this.y = (this.y)+speed_y;

    }

    private function passa2(e:Event):void
    {
    this.x= (this.x)+speed_x2;
    this.y = (this.y)+speed_y2;
    }
    }
    }
    --------------------------------------

    The names of the functions and variables are in Portuguese but if you want I can translate them to English, so you can understand better.

    Thanks, Chiapa

  6. #6
    Senior Member Steven FN's Avatar
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    To make a global variable use "public" as in: public var score:int = 0;
    Declare this in your main class and it should work. Then manipulate from there.

  7. #7
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    I declared it public, in the Main class, and in the spaceship class, in the function that removes the spaceships when I click them, the code to increment the points variable. This is the error I got:

    D:\Chiapa\Escola\Engenharia Informática\Tecnologias Multimédia\Flash\Chiapa game 2\Nave.as, Line 25 1120: Access of undefined property pontos.

    Pontos means points and I tried:
    points = points +1; trace(pontos);

    in the same function that removes the spaceships off the screen
    Last edited by Chiapa; 07-09-2012 at 08:12 PM.

  8. #8
    Senior Member Steven FN's Avatar
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    It seems like you're not declaring it properly. And you've tried exactly:
    Code:
    public var pontos:int = 0;
    Only place it in the Main class and try to trace pontos.

  9. #9
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    I can't get it to work: here's some code of the main class:

    public class Main extends MovieClip
    {
    var total:int = 200;
    var naves = new Array;
    var tempo:Timer;
    var tempo2:Timer;

    public var pontos:int = 0;

    var tempojogo:Timer = new Timer(1000,1);
    var musica_fundo:Sound = new Sound();
    var tiro:Sound = new Sound();
    ...
    ...


    And some code of the spaceship class, where I use the variable "pontos":

    private function quandoClique(e:MouseEvent)
    {
    trace("You're dead!\n");
    parent.removeChild(this);
    pontos = pontos + 1;
    trace(pontos);
    }


    However, I get that error, it says that I can't access the variable pontos.

    Help...

  10. #10
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    Jun 2012
    Posts
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    PHP Code:
    package
    {
    import flash.display.MovieClip;
    import flash.events.MouseEvent;
    import flash.ui.Mouse;
    import flash.events.TimerEvent;
    import flash.utils.Timer;
    import flash.events.Event;
    import flash.media.Sound;
    import flash.net.*;
    import flash.media.SoundChannel;

    public class 
    Main extends MovieClip
    {
    var 
    total:int 200;
    var 
    naves = new Array;
    var 
    tempo:Timer;
    var 
    tempo2:Timer;

    var 
    pontos:int 0;
    var 
    tempojogo:Timer = new Timer(1000,1);
    var 
    musica_fundo:Sound = new Sound();
    var 
    tiro:Sound = new Sound();

    function 
    Main():void
    {
    play_btn.addEventListener(MouseEvent.CLICKjogar);

    function 
    jogar(evt:MouseEvent):void
    {
    if (
    currentFrame == 1)
    {
    gotoAndStop(totalFrames);
    }
    else

    Mouse.hide();
    stage.addEventListener(MouseEvent.MOUSE_MOVE,mexe_ mira);
    stage.addEventListener(MouseEvent.CLICK,som);

    init_naves();
    tempo = new Timer(700,total);
    tempo.addEventListener(TimerEvent.TIMER,voa);
    tempo.start();

    tempo2 = new Timer(900,total);
    tempo2.addEventListener(TimerEvent.TIMER,voa2);
    tempo2.start();

    tempojogo.addEventListener(TimerEvent.TIMER,contad or);
    tempojogo.start();
    tiro.load(new URLRequest("SFX/tiro4mp.mp3"));
    }
    }

    function 
    som(event:MouseEvent)
    {
    tiro.play(0);

    }

    function 
    contador(event:TimerEvent)
    {
    contador_txt.text String(tempojogo.currentCount);
    }

    private function 
    voa(e:TimerEvent):void
    {
    var 
    nave naves.pop();
    nave.voa();
    }

    private function 
    voa2(e:TimerEvent):void
    {
    var 
    nave naves.pop();
    nave.voa2();
    }

    private function 
    init_naves():void
    {
    var 
    nave1;
    var 
    nave2;

    for (var 
    0totali++)
    {
    nave1 = new Nave ;
    nave1.= -30;
    nave1.Math.floor(Math.random() * this.stage.stageHeight);

    this.addChild(nave1);
    naves.push(nave1);
    }

    musica_fundo.load(new URLRequest("Musica/Carmina.mp3"));
    musica_fundo.play();
    }

    private function 
    mexe_mira(event:MouseEvent)
    {
    Mouse.hide();
    mira.mouseX;
    mira.mouseY;
    }
    }
    }
    ------------------------------- 
    This is the Spaceship class:


    PHP Code:
    package
    {
    import flash.display.MovieClip;
    import flash.events.*;
    import flash.utils.Timer;
    import flash.media.Sound;
    import flash.net.*;
    import flash.media.SoundChannel;

    public class 
    Nave extends MovieClip
    {
    var 
    speed_x:int 10;
    var 
    speed_x2:int 12;
    var 
    speed_y:int 2;
    var 
    speed_y2:int = -2;
    // var pontos:int = 0;

    function Nave():void
    {
    this.addEventListener(MouseEvent.CLICKcontapontos);
    }

    function 
    contapontos(e:MouseEvent):void
    {
    // pontos = pontos + 1;
    // trace(pontos);
    }

    private function 
    quandoClique(e:MouseEvent)
    {
    trace("Já foste!\n");
    parent.removeChild(this);
    // pontos = pontos + 1 ;
    // trace(pontos);
    }

    public function 
    voa():void
    {
    this.addEventListener(Event.ENTER_FRAMEpassa);
    addEventListener(MouseEvent.CLICK,quandoClique);
    }

    public function 
    voa2():void
    {
    this.addEventListener(Event.ENTER_FRAMEpassa2);
    addEventListener(MouseEvent.CLICK,quandoClique);

    }

    private function 
    quandoFrame(e:Event)
    {
    += speed_x;
    += speed_y;
    }

    private function 
    passa(e:Event):void
    {
    this.x= (this.x)+speed_x;
    this.= (this.y)+speed_y;

    }

    private function 
    passa2(e:Event):void
    {
    this.x= (this.x)+speed_x2;
    this.= (this.y)+speed_y2;
    }
    }


  11. #11
    Senior Member Steven FN's Avatar
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    274
    Ok just tested this out. Try the following.

    public static var pontos:int = 0;

    And reference by using Class.variable, ie "trace(Main.pontos);"

  12. #12
    Junior Member
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    Posts
    18
    Thanks Steven

    I had already tried that and it worked. The static variable worked fine, someone in another forum suggested it first but thanks anyway.

    Chiapa

  13. #13
    Senior Member Steven FN's Avatar
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    CA, USA
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    Glad you got it working. Sorry, i thought it was just something on your end, but it was the "static" keyword that was missing.

    I'm not one to use external AS files, i like to keep it all in the FLA or just Main class if possible. Happy flashing.

  14. #14
    Junior Member
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    Jun 2012
    Posts
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    Yeah, I had that thought too, working on the fla file or merging the classes in one.

    Thanks for your help and trouble

    Chiapa

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