AS3 提示类

package {  //  import flash.display.Sprite;  import flash.events.KeyboardEvent;  import flash.events.Event;  import flash.text.TextField;  import flash.text.TextFieldAutoSize;  import flash.ui.Keyboard;  import flash.utils.getTimer;  import flash.system.System;  //  public class documentClass extends Sprite {   //   var active:Boolean = false;   var allLogos:Array = new Array();   var Counter:TextField = new TextField();   var currentTime:int = 0;   var FPS:TextField = new TextField();   var Instructions:TextField = new TextField();   var Memory:TextField = new TextField();   var noOfLogos:int = 100;   //   public function documentClass():void {    stage.addEventListener(KeyboardEvent.KEY_UP, keyListener);    showHUD();   }     //   public function decreaseLogos(thousand:Boolean = false):void {    if (!active) return;    stopTest();    if (thousand) {     if (noOfLogos > 1000) {      noOfLogos = noOfLogos-1000;     }    } else {     if (noOfLogos > 100) {      noOfLogos = noOfLogos-100;     }    }    startTest();   }   //   public function increaseLogos(thousand:Boolean = false):void {    if (!active) return;    stopTest();    if (thousand) {     noOfLogos = noOfLogos 1000;    } else {     noOfLogos = noOfLogos 100;    }    startTest();   }   //   public function keyListener(event:KeyboardEvent):void {    if (event.keyCode == Keyboard.UP) startTest();    if (event.keyCode == Keyboard.DOWN) stopTest();    if (event.keyCode == Keyboard.RIGHT) {     if (event.ctrlKey == true) {      increaseLogos(true);     } else {      increaseLogos();     }    }    if (event.keyCode == Keyboard.LEFT) {     if (event.ctrlKey == true) {      decreaseLogos(true);     } else {      decreaseLogos();     }    }   }   //   public function mainLoop(event:Event):void {    var n:int;    for (n=0;n<noOfLogos;n ) {     var currentLogo:Logo = allLogos[n];     currentLogo.updatePosition();    }    updateHUD();   }   //   public function showHUD():void {    FPS.text = "FPS";    Counter.text = "Objects";    Counter.x = 50;    Memory.text = "mem";    Memory.x = 200;    var instText:String = "<font size='16'><b><u>Instructions</u></b>";    instText = "\nUp - starts the test";    instText = "\nDown - stops the test";    instText = "\nRight - increases the number of logos by 100";    instText = "\nLeft - decreases the number of logos by 100";    instText = "\nCtrl-Right - increases the number of logos by 1000";    instText = "\nCtrl-Left - decreases the number of logos by 1000";    Instructions.htmlText = instText;    Instructions.x = 275;    Instructions.y = 170;    Instructions.autoSize = TextFieldAutoSize.CENTER;    stage.addChild(FPS);    stage.addChild(Counter);    stage.addChild(Memory);    stage.addChild(Instructions);   }   //   public function startTest():void {    if (active) return;    var n:int;    for (n=0;n<noOfLogos;n ) {     var myLogo:Logo = new Logo(stage.stageWidth/2, stage.stageHeight/2);     allLogos[n] =  myLogo;     stage.addChild(myLogo);    }    stage.addEventListener(Event.ENTER_FRAME, mainLoop);    active = true;    Instructions.y = -200;    Counter.text = "Objects :" noOfLogos.toString();   }   //   public function stopTest():void {    if (!active) return;    stage.removeEventListener(Event.ENTER_FRAME, mainLoop);    var n:int;    for (n=0;n<noOfLogos;n ) {     stage.removeChild(allLogos[n]);     var currentLogo:Logo = allLogos[n];     currentLogo = null;    }    active = false;    Instructions.y = 170;   }   //   public function updateHUD():void {    var fps:Number = 1/((getTimer()-currentTime)/1000);    currentTime = getTimer();    FPS.text = "FPS: " Math.round(fps).toString();    Memory.text = "Mem :" (Math.round((System.totalMemory/1048576)*10)/10).toString() " MB";   }  } }