使用 FLEX 和 Actionscript 开发 FLASH 游戏-碰撞检测（第
三页）
GameObjectManager.as
package
{
import flash.display.*;
import flash.events.*;
import flash.utils.*;
import mx.collections.*;
import mx.core.*;
public class GameObjectManager
{
//double buffer
public var backBuffer:BitmapData;
//colour to use to clear backbuffer with
public var clearColour:uint=0xFF0043AB;
//static instance
protected static var instance:GameObjectManager=null;
//the last frame time
protected var lastFrame:Date;
//a collection of the GameObjects
protected var gameObjects:ArrayCollection=new ArrayCollection();
// a collection where new GameObjects are placed,to void adding items
//to gameObjects while in the gameObjects collection while it is in a loop
protected var newGameObjects:ArrayCollection=new ArrayCollection();
//a collection where removed GameObjects are placed,to avoid removing items
//to gameObjects while in the gameObjects collection while it is in a loop
protected var removedGameObjects:ArrayCollection=new ArrayCollection();
protected var collisionMap:Dictionary=new Dictionary();
static public function get Instance():GameObjectManager
{
if(instance==null)
instance=new GameObjectManager();
return instance;
}
public function GameObjectManager()
{
if(instance!=null)
throw new Error("Only one Singleton instance should be instantiated");
backBuffer=new
BitmapData(Application.application.width,Application.application.height,false);
}
public function startup():void
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