Category Archives: Events

Not a Snippet (wandering robots)

By Zevan | January 31, 2009
CLICK HERE TO COPY
Actionscript:
  1. package {
  2.     import flash.display.Sprite;
  3.    
  4.     [SWF(width=500, height=500, backgroundColor=0xEFEFEF, frameRate=30)]
  5.     public class Main extends Sprite{
  6.         private var _robotManager:RobotManager;
  7.         public function Main(){
  8.           _robotManager = new RobotManager(this, 12);
  9.         }
  10.     }
  11. }
  12.  
  13. class RobotManager{
  14.    
  15.     private var _robots:Array;
  16.     private var _top:Sprite;
  17.     private var _robotNum:int;
  18.    
  19.     public function RobotManager(top:Sprite, robotNum:int){
  20.         _top = top;
  21.         _robotNum = robotNum;
  22.         _robots = new Array();
  23.         setupRobots();
  24.         top.addEventListener(Event.ENTER_FRAME, onRun);
  25.     }
  26.    
  27.     private function setupRobots():void{
  28.         for (var i:int = 0; i<_robotNum; i++){
  29.             _robots[i] = new Robot();
  30.             _robots[i].x = 100+(i % 3) * 150;
  31.             _robots[i].y = 100+int(i / 3) * 100;
  32.             _robots[i].addEventListener("death", onRobotDie);
  33.             _top.addChild(_robots[i]);
  34.         }
  35.     }
  36.     private function onRobotDie(evt:Event):void{
  37.         for (var i:int = 0; i<_robotNum; i++){
  38.             if (_robots[i] == evt.currentTarget){
  39.                 _robots.splice(i, 1);
  40.             }
  41.         }
  42.         _robotNum--;
  43.     }
  44.    
  45.     private function onRun(evt:Event):void{
  46.         collisions();
  47.     }
  48.    
  49.     private function collisions():void{
  50.         var currBot:Robot;
  51.         for (var i:int = 0; i<_robotNum; i++){
  52.             currBot = _robots[i];
  53.             for (var j:int = 0; j<_robotNum; j++){
  54.                 if (currBot != _robots[j]){
  55.                     var dx:Number = currBot.x - _robots[j].x;
  56.                     var dy:Number = currBot.y - _robots[j].y;
  57.                     if (Math.sqrt((dx * dx) + (dy * dy)) <40){
  58.                         currBot.die();
  59.                     }
  60.                 }
  61.             }
  62.         }
  63.     }
  64. }
  65.  
  66. import flash.display.*
  67. import flash.events.*;
  68.  
  69. class Robot extends Sprite{
  70.     private var _inc:Number
  71.     private var _td:Number;
  72.     private var _theta:Number;
  73.     private var _rad:Number;
  74.    
  75.     public function Robot(){
  76.         _theta = Math.random() * (Math.PI * 2);
  77.         _td = _theta;
  78.         _inc = Math.random() * .2 + .05;
  79.         _rad = _inc * 10;
  80.         with(graphics){
  81.             beginFill(0x666666);
  82.             drawRect(-10,-10,20,20);
  83.             endFill();
  84.             beginFill(0x333333);
  85.             drawRect(-5, -5, 20, 10);
  86.             lineStyle(0,0xAAAAAA);
  87.             endFill();
  88.             drawCircle(0,0,20);
  89.         }
  90.         addEventListener(Event.ENTER_FRAME, onRun);
  91.     }
  92.    
  93.     private function onRun(evt:Event):void{
  94.         _td  += _inc;
  95.         _theta += _inc * Math.cos(_td);
  96.         if (x <0 || y <0 || x> 500 || y> 500){
  97.             _theta += Math.PI;
  98.         }
  99.         x += _rad * Math.cos(_theta);
  100.         y += _rad * Math.sin(_theta);
  101.         rotation = _theta / Math.PI * 180;
  102.     }
  103.    
  104.     public function die():void{
  105.         removeEventListener(Event.ENTER_FRAME, onRun);
  106.         addEventListener(Event.ENTER_FRAME, onDie);
  107.     }
  108.    
  109.     private function onDie(evt:Event):void{
  110.         scaleX = scaleY += .1;
  111.         alpha -= .1;
  112.         if (scaleX> 2){
  113.             removeEventListener(Event.ENTER_FRAME, onDie);
  114.             if (parent){
  115.                 parent.removeChild(this);
  116.                 dispatchEvent(new Event("death"));
  117.             }
  118.         }
  119.     }
  120. }

This code should be placed in a document class... not the timeline (hopefully you already know that)

The above creates 12 wandering robots that die when they collide with one another.

This is not a snippet really... but it's only slightly over 100 lines and it contains a few tricks I find myself using from time to time.

You can view the swf here.

Also posted in OOP, arrays, motion | Tagged , , | 3 Comments

Click Listener

By Zevan | November 5, 2008
CLICK HERE TO COPY
Actionscript:
  1. var e:String = "addEventListener";
  2.  
  3. stage[e]("click", function():void{
  4.     trace("clicked", arguments[0]);
  5. });

Strange code to do a click listener. arguments[0] is the event object. (Check out the "warning" page for more info about this).

CLICK HERE TO COPY
Actionscript:
  1. stage.addEventListener(MouseEvent.CLICK, onStageClick);
  2. function onStageClick(evt:MouseEvent):void {
  3.     trace("clicked", evt);
  4. }

Normal way.

Posted in Events | 2 Comments