[心得] ByteArray.compress 壓縮函數

這篇文章描述了使用 compress 並不會減少實際記憶體使用量

以及解決方法

http://etrex.blogspot.com/2011/05/bytearraycompress.html

Import fl components into Flash Builder

Download fl packages
http://apdevblog.com/update-using-flvideo-package-w-eclipse-and-fdt3/

Export fl.* components
http://joshblog.net/2008/02/10/how-to-use-the-flash-cs3-component-set-in-a-flex-builder-actionscript-project/

add above swc to the build path of your flash builder project.

Flash Display List

Passing parameters to ActionScript from HTML query strings

URL String: http://me.com/index.html?name=redbug&bday=0314

Method 1: root.loaderInfo.parameters
1. get query strings in url by javascript

• window.location.href
• window.location.search

2. passing parameter to SWF in HTML

• <object><embed src="Foo.swf?name="redbug&bday=0314/></object>  or
• Using FlashVars to pass variables to a SWF

3. receive parameter in ActionScript
<br /> // from swf parmeters<br /> private function getFlashVars()<br /> {<br /> var params:Object = root.loaderInfo.parameters;<br /> if( params ){<br /> for (var key:Object in params) {<br /> trace( key, params[key] ); <br /> }<br /> }<br /> }<br />



Method 2: ExternalInterface.call('javascript function name')
receiving parameters in ActionScript
<br /> // from url query string<br /> private function getQueryStringFromHTML()<br /> {<br /> var queryStr:String = ExternalInterface.call( "window.location.search.substring", 1 );<br /> if( queryStr ){<br /> trace( queryStr );<br /> }<br /> }<br />



Reference:
Flex程序如何获取html容器传递的URL参数值
ActionScript JavaScript Communication

ActionScript 3.0 Cookbook - Chapter 22 Building Integrated Application

[BulkLoader] Failed to get content with url as type: [class Bitmap]

今天試玩Google image search API, 用bulkloader來載圖,
在flash builder上run的好好的，但放在網路就無法執行。
後來trace bulkloader的ImageItem.as source code

<br /> override public function onCompleteHandler(evt : Event) : void {<br /> // TODO: test for the different behaviour when loading items with <br /> // the a specific crossdomain and without one<br /> try{<br /> // of no crossdomain has allowed this operation, this might<br /> // raise a security error<br /> _content = loader.content;<br /> super.onCompleteHandler(evt);<br /> }catch(e : SecurityError){<br /> // we can still use the Loader object (no dice for accessing it as data<br /> // though. Oh boy:<br /> _content = loader;<br /> super.onCompleteHandler(evt);<br /> // I am really unsure whether I should throw this event<br /> // it would be nice, but simply delegating the error handling to user's code <br /> // seems cleaner (and it also mimics the Standar API behaviour on this respect)<br /> //onSecurityErrorHandler(e);<br /> } <br /> };<br />

才發現bulkloader在發生cross domain security error時，並不會把err丟出來，反而是把載好圖的loader丟給上層。
回去翻文件，才發現其實文件有寫... XD

SecurityError

BulkLoader can handle SecurityErrorEvents. By listening to BulkLoader.SECURITY_ERROR("securityError"), client code can gracefully handle security error events. Listeners can be added to each LoadingItem subtype or to the entire BulkLoader object. Please note that if you add an event listener for a LoadingItem but not for BulkLoader, in case the event fires, it will bubble up and result in a unhandled security error. In order to make sure the error never goes unhandled, add a securityError handler to the BulkLoader instance.

This mechanism will catch events thrown on

.load operations. Event thrown when trying to access content (such as getBitmapData) is still left to client code to handle.

When using type=image or type=movieclip (which are loaded using a Loader instance), if, when the asset is loaded, accessing it's loader.content throws an error, then BulkLoader will gracefully recover and use a simple Loader instance. This way, you can still add a Loader object to the stage, but won't be able to run code inside of it (for MovieClip instances) or load it as data (transforming to BitmapData instances).

In this case, you can get the Loader instance either using getContent or getDisplayObjecLoader .

所以原本寫的
addChild( imageLoader.getBitmap( key ) );

改寫成
addChild( imageLoader.get( key ).content );

就不會有cross domain security 討人厭的問題了.

Ref:
http://groups.google.com/group/bulkloader-users/browse_thread/thread/31189ad472fb1d90

AS3 flickr API

先申請Flickr API Key, non-commercial就可以了.

http://www.flickr.com/services/apps/create/apply

這個下方有列出很多可用的API

http://www.flickr.com/services/api/

我是用這個

http://code.google.com/p/as3flickrlib/

這個library會用到as3corelib, 所以先裝一下

http://code.google.com/p/as3corelib/

這個人為as3flickrlib寫了一個example

http://blog.organa.ca/?p=19

從上面這個網頁抓一下他的 flickrGrabber class

trace 他的code，再比對一下 http://www.flickr.com/services/api/

大概就知道怎麼用或hack as3flickrlib了...

BTW, 中文的keyword query，

必須先將query string用encodeURI()做編碼再送UrlRequest，否則flickr會回傳查無結果。
(這部分要感謝卡卡米教教!! :D)

下面是兩篇有用的參考:

http://blog.miniasp.com/post/2007/11/Talking-about-JavaScript-URLEncode.aspx

http://bbs.9ria.com/archiver/tid-71.html

要求Flickr在收到search request時丟回Photo list 的Thumbnail urls
http://www.flickr.com/services/api/flickr.photos.search.html
有個 extras (Optional) 參數
把"url_t" assign給extras, flickr就會在search result中加上<url_t>這個tag, 並且把 thumbnail url 內嵌在裡面丟回來。

Flickr limits
Query limits per hour to Flickr: 3600
Photo result limits per search query: 4000

用 js 完成 Flash 的右鍵事件

http://www.uza.lt/2007/08/19/solved-right-click-in-as3/

A rest for your SWF

試過了, 可以work.
好用的trick!


http://imagineric.ericd.net/?p=353
Well, it works for a SWF, but if you’re deploying a projector it doesn’t want to work correctly. It loads nothing in the projector’s viewport. It works if you launch the SWF as a standalone or in a browser.

<br /> var url:String = stage.loaderInfo.url;<br /> var request:URLRequest = new URLRequest(url);<br /> navigateToURL(request,"_level0");<br />

Uniquely random number array generation

http://ticore.blogspot.com/2011/01/as3-unique-random-number.html

三招都很cool!
尤其第三招用了Array.RETURNINDEXEDARRAY會回傳不重覆index array的特性.
超酷!!


Array.RETURNINDEXEDARRAY的用法可參考下面這篇~
http://blogs.adobe.com/actionscriptdocs/tag/returnindexedarray



Ticore大大還用Array.RETURNINDEXEDARRAY
實做簡潔的連續整數(0-n)array
http://ticore.blogspot.com/2011/01/as3-fast-way-generate-integer-sequence.html

Trick on iterating array concatenation

nice trick!!
http://blog.eddie.com.tw/2011/01/18/faster-array-concatenation-in-as3/

array1.push.apply( array1, array2);


<br /> package<br /> {<br /> import flash.utils.getTimer;<br /> <br /> public class Case2<br /> {<br /> private const TEST_ROUNDS:int = 50;<br /> private const ARRAY_SIZE:int = 1000;<br /> <br /> private var _bigArray1:Array;<br /> private var _bigArray2:Array;<br /> <br /> public function Case2()<br /> {<br /> trace("in Case2");<br /> <br /> test_push_and_apply();<br /> trace("");<br /> test_concat();<br /> }<br /> <br /> private function iniArrays():void<br /> {<br /> _bigArray1 = [];<br /> _bigArray2 = [];<br /> <br /> for( var i:int = 0; i< ARRAY_SIZE; ++i ) { _bigArray1.push( i ); _bigArray2.push( i ); } } private function test_concat():void { iniArrays(); trace("== TEST Array Concat =="); var timer_start:int = getTimer(); for (var i:int = 0; i< TEST_ROUNDS; i++) { _bigArray1 = _bigArray1.concat(_bigArray2); } var timer_end:int = getTimer(); trace("the length of array1 is : " + _bigArray1.length); trace("== " + (timer_end - timer_start) + " miniseconds =="); } private function test_push_and_apply():void { iniArrays(); trace("== TEST Array Push and Apply =="); var timer_start:int = getTimer(); for (var i:int = 0; i< TEST_ROUNDS; i++) { _bigArray1.push.apply(_bigArray1, _bigArray2); } var timer_end:int = getTimer(); trace("the length of array1 is : " + _bigArray1.length); trace("== " + (timer_end - timer_start) + " miniseconds =="); } } }

HashMap in ActionScript

<br /> package {<br /> <br /> public dynamic class HashMap extends Object {<br /> <br /> public function clear():void {<br /> for (var key:String in this)<br /> this[key] = null;<br /> }<br /> <br /> /** 'get' is an ActionScript reserved word */<br /> public function getIndex(index:int):* {<br /> var i:int = 0;<br /> for (var key:String in this) {<br /> if (i==index)<br /> return this[key];<br /> }<br /> return null;<br /> }<br /> <br /> /** ActionScript cannot overload functions so a unique function name was chosen */<br /> public function getItem(key:String):Object { return this[key]; }<br /> <br /> public function put(key:String, value:Object):void {<br /> this[key] = value;<br /> }<br /> <br /> public function remove(key:String):Object {<br /> this[key] = null;<br /> return this;<br /> }<br /> <br /> public function size():int {<br /> var len:int = 0;<br /> for (var key:String in this)<br /> len++;<br /> return len;<br /> }<br /> <br /> public function toString():String {<br /> var delim:String = "";<br /> var str:String;<br /> for (var key:String in this) {<br /> str += delim + key + ": " + this[key];<br /> delim = "\n";<br /> }<br /> return str;<br /> }<br /> <br /> public function values():ArrayCollection {<br /> var values:ArrayCollection = new ArrayCollection();<br /> for (var key:String in this)<br /> values.addItem(this[key]);<br /> return values;<br /> }<br /> }<br /> }<br />

CJ Signals

可以參考一下

http://cjcat.blogspot.com/2010/07/cjsignals-my-new-observer-framework.html

Dispatch Custom Values via DeluxeSignal

http://groups.google.com/group/as3-signals/msg/474cc2ec4e122be1?pli=1

Yes ,that works. 
Thank you Robert for a fast response. 
On Sep 17, 1:50 am, Robert Penner  wrote: 
> Try new DeluxeSignal(this, IEvent, String,int); 
> Sorry this isn't well-documented. 
> Robert 
> On Sep 16, 4:17 pm, iki_xx  wrote: 
> > How can I dispatch custom values via DeluxeSignal? 
> > Meaning: 
> > new DeluxeSignal = new DeluxeSignal(this,String,int); 
> > deluxeInstance.dispatch(new GenericEvent(),'"foo",999); 
> > it doesnt work , I get runtime errors : Value object <[object 
> > GenericEvent]> is not an instance of <[class String]>. 
> > how can I dispatch/catch those parameters ? 
> > Do I have to extend the GenericEvent class, and add those parameters 
> > to the subclass of the GenericEvent class? 
> > Thanks 

Vector Initialization with an Inline Array as Source

private const vec:Vector.<Number> = new Vector.<Number>( [0.1, 0.2, 0.3, 0.4] );
The Vector initialization fails silently, i.e. the compiler will not throw any error during the compile time, when you put the identifier "new" prior to the Vector initialization statement.

Objects Sliding on Horizontal Floor (As if there is no friction)

http://www.box2d.org/forum/viewtopic.php?f=4&t=66
Right, there is no rolling friction in Box2D. I can certainly add this. I can also add linear/angular damping. I think I'll do the latter first. For now you can just multiply the linear/angular velocity by a number slightly less than 1 each time step (like 0.95). You can also generate some energy loss by reducing the friction. Then the circles will slide a bit more and slow down, instead of sticking and rolling.


I finally solved this problem by using b2Body.SetLinearDamping() 

Why Dynamic Bodies Are Never Sleeping in Box2D World ?

What's the fucking bug!!

http://www.box2d.org/forum/viewtopic.php?f=3&t=3501

I figured out why they aren't sleeping. If gravity is greater than 60 then the bodies wont sleep. With 2.0.1 bodies will sleep with gravity as high as 100. The same issue manifests for setting forces directly to objects.

AS3 Signals

AS3 Signals Project Site
http://github.com/robertpenner/as3-signals

AS3 Signals Tutorial Video
http://johnlindquist.com/2010/01/21/as3-signals-tutorial/

Reflecting on AS3 signals
http://alecmce.com/as3/reflecting-on-as3signals

Nice example and clear explanation
http://blog.tkassembled.com/83/

Robotlegs and AS3 Signal Example
http://www.newtriks.com/?p=785

亂數球體座標

以下轉自ptt flash版


作者  kyzusmugoe (阿達達~鬼王達)                                 看板  Flash
標題  [問題] 想請教"亂數球體面積座標"的公式
時間  Wed Sep 15 21:58:44 2010

借用cj神的zedbox做demo一下~
swf : http://tinyurl.com/277plu2
其實wiki搜尋"球座標系"裡面就有答案 http://tinyurl.com/24796s6

以下是改過的code~
var rd:uint = 500;
var inclination:Number;
var azimuth:Number
for (var i:uint; i < 200; i++ )
{
    var zs:ZedSprite = new ZedSprite();
    inclination = Math.random() * Math.PI * 2;
    azimuth = Math.random() * Math.PI * 2;
    zs.x = rd * Math.cos(inclination) * Math.cos(azimuth);
    zs.y = rd * Math.sin(inclination) * Math.cos(azimuth);
    zs.z = rd * Math.sin(azimuth) ;
    container.addChild(zs);
}

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作者  cjcat2266 (CJ Cat)                                         看板  Flash

標題  Re: [問題] 想請教"亂數球體面積座標"的公式

時間  Fri Sep 17 22:53:08 2010

其實有另外一招超簡單的偷吃步喔

就是直接用random做出一個亂數(x, y, z)座標向量

然後把這個向量標準化(normalize)之後調整長度為RADIUS

        var x:Number = Math.random() - 0.5;

        var y:Number = Math.random() - 0.5;

        var z:Number = Math.random() - 0.5;

        var factor:Number = RADIUS / Math.sqrt(x * x + y * y + z * z);

        x *= factor;

        y *= factor;

        z *= factor;

以上code參考自Flint Particles的SphereZone class

Stardust也是用這種方式取得亂數球體座標

雖然不是說很"均勻"，但是我個人覺得夠用了

重點是計算很簡單，不太需要什麼大腦XD

One swf, multiple Classes, multiple ApplicationDomains

讓interface在第一個frame載入,

implementation放在第二個frame載入.

好處是implementation可以在runtime抽換?

http://www.ghost23.de/2010/10/one-swf-multiple-classes-multiple-applicationdomains/

Display Frame Rate

1. create a TextField named "frameRate_txt"
2. put following codes in the first frame of a flv file.
var designatedFrameRate :Number = stage.frameRate; <br /> var lastFrameTime :Number;<br /> <br /> this.addEventListener(Event.ENTER_FRAME, showFrameRate);<br /> <br /> function showFrameRate(event:Event):void<br /> {<br /> var now :Number = getTimer();<br /> var elapsed :Number = now - lastFrameTime;<br /> var framePerSecond :Number = Math.floor(1000/elapsed);<br /> lastFrameTime = now;<br /> <br /> frameRate_txt.text = "Frame Rate: " + String(framePerSecond) + " / " + String(designatedFrameRate); <br /> }<br /> <br />