Firefox 2 的 IE Tab 外掛跑 Flash 會有怪問題

Flash CS3/AS3, stage.stageWidth 和 stage.stageHeight 在 FireFox 2 的 IE Tab 外掛會有 Bug, 一開始值為 0.

AS3 亂數排序的效能

利用三種方式來實作亂數排序的功能, 並比較效能
A. 製作 Array.sort() 的排序函式
B. 大風吹, 兩兩隨機交換位置
C. 使用 splice() 隨機一個個切出來
結果 B 效能最佳:

A: 2116
B: 66
C: 3828

Flash Frame Actions:

/*
*******
   A. 配合 Array.sort() 使用
*******
*/
function shuffle_1(...args):int
{
 return Math.floor(3 * Math.random()) - 1;
}
/*
*******
   B. 大風吹, 隨機交換位置
*******
*/
function shuffle_2(ar:Array):void
{
 var rnd:int;
 var tmp:Object;
 for (var i:int=0; i < ar.length; i++) {
  rnd = Math.floor(Math.random()*ar.length);
  tmp = ar[i];
  ar[i] = ar[rnd];
  ar[rnd] = tmp;
 }
}
/*
*******
   C. 隨機一個一個取出, 推入新陣列
*******
*/
function shuffle_3(ar:Array):Array
{
 var br:Array = [];
 var rnd:int;
 var cr:Array;
 while (ar.length)
 {
  rnd = Math.floor(Math.random()*ar.length);
  //cr = ar.splice(rnd, 1);
  br.push( ar.splice(rnd, 1)[0] );

 }
 return br;
}
/*****************************************/
var ar:Array = [];
for (var i:int=0; i < 100000; i++) {
 ar.push(i);
}

var t:int = getTimer();
ar.sort(shuffle_1);
trace("A: "+ (getTimer()-t) );

t = getTimer();
shuffle_2(ar);
trace("B: "+ (getTimer()-t) );

t = getTimer();
ar = shuffle_3(ar);
trace("C: "+ (getTimer()-t) );

AS3 兩點求距離

AS3 求兩點間的距離不用記公式了

var p1:Point = new Point(10, 8);
var p2:Point = new Point(2, 17);
trace( Point.distance(p1, p2));
trace(p1.subtract(p2).length);

Popup Modal MovieClip for Flash/AS3

Flex 有 PopUpManager 可以 pop-up window 或 custom component
Flash CS3/AS3 則沒有 :(
若只是用個 PopUpManager, 以 Flex 發佈後實在有點肥大...

我在網路上找了老半天, 只找到 Yahoo ASTRA Flash Components 裡提供的 AlertManager. 不過功能實在太陽春, 想說做點客制化, 改著改著幾乎跟重寫差不多了. 版權 follow BSD.

Demo:


ModalDisplayManager.as

/*
Copyright (c) 2008 Yahoo! Inc.  All rights reserved.  
The copyrights embodied in the content of this file are licensed under the BSD (revised) open source license

shinder modified
refer com.yahoo.astra.fl.managers.AlertManager

shinder.lin@gmail.com
http://qops.blogspot.com/
*/

package lin.shinder.fl.managers
{
 import flash.display.DisplayObject;
 import flash.display.MovieClip;
 import flash.display.Graphics;
 import flash.display.Stage;
 import flash.display.StageScaleMode;
 import flash.display.StageAlign;
 import flash.events.Event;
 import flash.events.MouseEvent;
 import flash.filters.BitmapFilterQuality;
 import flash.filters.BlurFilter;
 import flash.filters.BitmapFilter;

 public class ModalDisplayManager extends MovieClip
 {
  private static  var _alertQueue:Array = [];
  private static  var _alert:MovieClip;
  private static  var _displayManager:ModalDisplayManager;
  private static  var _stage:Stage;
  public static  var overlayAlpha:Number = .16;
  public static  var modalBackgroundBlur:int = 3;
  private static  var _overlay:MovieClip;
  protected var container:DisplayObject;
  protected var parentFilters:Array;

  public function ModalDisplayManager(container:DisplayObject)
  {
   if (! _displayManager) {
    if (container != null) {
     _stage = container.stage;
    } else {
     trace("ModalDisplayManager: the 1st parameter cannot be null !");
    }
    if ( _stage.scaleMode != StageScaleMode.NO_SCALE ) {
     // trace("ModalDisplayManager prefers: stage.scaleMode = StageScaleMode.NO_SCALE !");
    }
    if ( _stage.align != StageAlign.TOP_LEFT ) {
     trace("ModalDisplayManager prefers: stage.align = StageAlign.TOP_LEFT !");
    }
    _stage.addChild(this);
    _stage.addEventListener(Event.RESIZE, stageResizeHandler);
    _stage.addEventListener(Event.FULLSCREEN, stageResizeHandler);
   }
  }

  public static function createModalDisplay(container:DisplayObject, 
     content:Class = null,
     promp:Object = null):ModalDisplayManager
  {
   if (! _displayManager) {
    _displayManager = new ModalDisplayManager(container);
   }
   _overlay = new MovieClip();
   var g:Graphics = _overlay.graphics as Graphics;
   g.beginFill(0xeeeeee, overlayAlpha);
   g.moveTo(0,0);
   g.lineTo(100, 0);
   g.lineTo(100, 100);
   g.lineTo(0, 100);
   g.lineTo(0, 0);
   g.endFill();
   _displayManager.addChild(_overlay);

   _overlay.stageResizeHandler = function() {
    this.width = _stage.stageWidth;
    this.height = _stage.stageHeight;
    if (this._alert != null ) {
     this._alert.x = (_stage.stageWidth-this._alert.width)/2;
     this._alert.y = (_stage.stageHeight-this._alert.height)/2;
    }
   };

   _alert = new content() as MovieClip;
   _overlay._alert = _alert;
   _overlay.stageResizeHandler();
   if (_alert.init) {
    _alert.init(promp);
   } else {
    // trace("ModalDisplayManager: the 2nd parameter should define a function named init(promp:Object) !");
   }
   _displayManager.addChild(_alert);
   _displayManager.container = container;
   var newFilters:Array = _displayManager.container.filters.concat();
   var oldFilters:Array = _displayManager.container.filters.concat();
   
   if(_alertQueue.length == 0) {
    newFilters.push(_displayManager.getBlurFilter());
    _displayManager.container.filters = newFilters;
   }
   for(var i:int=0; i < _alertQueue.length; i++) {
    _alertQueue[i]['_alert'].filters = [_displayManager.getBlurFilter()];
   }

   var alertParams:Object = {
    container:container,
    content:content,
    promp:promp,
    _overlay:_overlay,
    _alert:_alert,
    _filters:oldFilters
   };
   _alertQueue.push(alertParams);
   return _displayManager;
  }
  
  public function manageQueue():void
  {
   if(_alertQueue.length == 0){
    return;
   }
   var obj:Object = _alertQueue.pop();
   obj.container.filters = obj._filters;
   _displayManager.removeChild(obj._alert);
   _displayManager.removeChild(obj._overlay);
   if(_alertQueue.length>0) {
    _alertQueue[_alertQueue.length-1]['_alert'].filters = [];
   }
  }
  
  public function getBlurFilter():BitmapFilter
  {
   var blurFilter:BlurFilter = new BlurFilter();
   blurFilter.blurX = modalBackgroundBlur;
   blurFilter.blurY = modalBackgroundBlur;
   blurFilter.quality = BitmapFilterQuality.HIGH;
   return blurFilter;
  }
  
  private function stageResizeHandler(evt:Event):void
  {
   for each(var o:Object in _alertQueue) {
    o._overlay.stageResizeHandler();
   }
  }
 }
}

Frame Actions:

import lin.shinder.fl.managers.ModalDisplayManager;
stage.align = StageAlign.TOP_LEFT;
b_btn.addEventListener(MouseEvent.CLICK, onClick);
y_btn.addEventListener(MouseEvent.CLICK, onClick);
function onClick(evt:MouseEvent):void
{
 if (evt.currentTarget==b_btn) {
  ModalDisplayManager.createModalDisplay(this, mc_gear);
 } else {
  ModalDisplayManager.createModalDisplay(this, mc_gear2, {a:"abc"});
  ModalDisplayManager.createModalDisplay(this, mc_gear3);
 }
}

測試範例原始檔

關掉 USB 碟的自動播放吧

朋友給資料時的 USB 碟幾乎每支都有木馬, 而且共用的電腦也常中木馬
在此建議關掉 autorun 功能, 資料來源 資安論壇

執行 regedit，至
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explor
er]
加入(修改) dword
名稱=NoDriveTypeAutoRun
值=000000ff

Open Flash Chart - 免費的 flash 各式圖表

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