Score counter in AS3

**Chiapa** · 06-17-2012 07:40 AM

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

**Steven FN** · 06-18-2012 06:33 AM

I would just add a "score" variable to the Main class and then increment score on "whenclick" with either: score++; OR score += scoreIncrement;

**Chiapa** · 07-09-2012 06:42 PM

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?

**Steven FN** · 07-09-2012 07:03 PM

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.

**Chiapa** · 07-09-2012 07:54 PM

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

**Steven FN** · 07-09-2012 08:02 PM

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.

**Chiapa** · 07-09-2012 08:09 PM

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

**Steven FN** · 07-09-2012 10:49 PM

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.

**Chiapa** · 07-10-2012 02:05 PM

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...

**Chiapa** · 07-12-2012 05:39 AM

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.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;

}

}

}

-------------------------------

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.CLICK, contapontos);

}



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_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;

}

}

}

**Steven FN** · 07-13-2012 02:25 PM

Ok just tested this out. Try the following.

public static var pontos:int = 0;

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

**Chiapa** · 07-13-2012 07:45 PM

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

**Steven FN** · 07-13-2012 08:41 PM

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.

**Chiapa** · 07-14-2012 04:03 AM

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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