/**
   * @inheritDoc
   * */
  public function get scale():Number {
   return _scale;
  }

  /**
   * @inheritDoc
   * */
  public override function get scaleY():Number
  {
   var curScale:Number;
   curScale = super.scaleY;
   var parentComp:DisplayObject = this.parent;
   while(parentComp && !(parentComp is VisualGraph))
   {
    curScale *= parentComp.scaleY;
    parentComp = parentComp.parent;
   }
   return curScale;
  }

  /**
   * @inheritDoc
   * */  
  public override function get scaleX():Number
  {
   var curScale:Number;
   curScale = super.scaleX;
   var parentComp:DisplayObject = this.parent;
   while(parentComp && !(parentComp is VisualGraph))
   {
    curScale *= parentComp.scaleX;
    parentComp = parentComp.parent;
   }
   return curScale;
  }
  
  /**设置画布缩放比例
   * @private
   * */
  public function set scale(s:Number):void {
   /* get the current value */
   const s0:Number = _canvas.scaleX;
   /* set the new value */
   
   /* Fix Scaling problem (Scrollbar shouldn't scale with graph)*/ 
   //scaleX = s;
   //scaleY = s;
   _canvas.scaleX = s;
   _canvas.scaleY = s;
   /* scroll to the center */
   scroll(center.x * (1 - s / s0) / s, center.y * (1 - s / s0) / s,false);  //实现居中方法
   /* redraw the edges */
   refresh();
   /* remember the set value, this is probably unnecesary
    * since the getter could just return the value of scaleX
    * but anyway */
   _scale = s;
  }
 /**
   * @inheritDoc
   * */
  public function scroll(deltaX:Number, deltaY:Number, reset:Boolean):void {
   
   var i:uint;
   var children:Array;
   var view:UIComponent;
   
   children = _canvas.getChildren();
   
   /* we walk through all children of the canvas, which
    * are not the drawing surface and which are UIComponents
    * (they should be all node views) and move them according
    * to the scroll offset */
   for each(view in children) {
    if(view != _drawingSurface) {
     //LogUtil.debug(_LOG, "scrolling view of:"+(view as IDataRenderer).data.id);
     view.x += deltaX;
     view.y += deltaY;
    }
   }
   
   if(reset) {
    _origin = new Point(0,0);
   }
   /* adjust the current origin of the canvas
    * (not 100% sure if this is a good idea but seems
    * to work) XXX */
   _origin.offset(deltaX,deltaY);
           
            /* we have to force the edges to redraw so they match the nodes*/
            _forceUpdateEdges = true;
            invalidateDisplayList();
   //LogUtil.debug(_LOG, "Setting new origin to:"+_origin.toString());
  }
  
}

跨域文件读取

方法一：在目标服务器上布署crossdomain.xml文件(我用的此方法很管用，放上就没问题了) 需要远程服务根目录定义有crossdomain.xml文件，如下：

<?xml version="1.0" encoding="UTF-8" ?> <cross-domain-policy>     <allow-access-from domain="*"/> </cross-domain-policy>

方法二：使用代理，把Flex要访问的远程文件通过asp, php, jsp等脚本读取到本地，然后再由Flex去访问；

方法三：使用Adobe flash player 9 打开程序后，点击菜单栏中文件->创建播放器...即生成exe文件，运行exe文件即可突破安全限制；

方法四：     1、找到这个文件夹：c:\Documents and Settings\<UserName>\Application         Data\Macromedia\Flash Player\#Security     2、在其下建立一个名为"FlashPlayerTrust"的文件夹     3、在"FlashPlayerTrust"文件夹下新建一TXT文件，内容如下：         c:\         d:\         e:\         f:\     4、将该txt文件命名为:"myTrustFiles.cfg"     再打开你硬盘里的SWF文件,就不会出现那个烦人的安全设置提示窗口了!

方法五： 用HttpService它默认是有Proxy的，需要配置flex-config.xml，里面有一段： <http-service-proxy>      <whitelist>         ………………     </whitelist> </http-service-proxy>

这个是白名单，一般情况下是注释掉的，也就是默认只有本地的http://{localserver}/*和https://{localserver}/*可以访问。其他的需要在flex-config.xml里的自行修改成需要的就可以了。

访问本地自然不会跨域，不过你肯定访问局域网其他机器了，所以是依照白名单规则，属于跨域

Socket沙箱问题（已验证）

在Flex中使用Socket进行通信时,也会受到Flash9的新安全策略的困扰. 解决方法不能像在Web服务器中布置一个crossdomain.xml来解决,或是在服务器上专门开启843端口来提供安全策略. 有一种方法就是在接收到客户端的连接后,向其发送 安全策略.

比如我是用JAVA来开发, 客户端的Flex会先搜索同域,及服务器的843口,看是否能得到安全策略,这时候Socket是先建立好的,可以在接收到Socket ,即Accept事件发生是,马上向其发送 策略串,否则客户端就会因为安全策略不过关,于断开, 如果成功获取策略,则客户端将断掉先前的那次Socket, 再真正进行程序中你要求的Socket连接请求.

下面看看我找的例子吧！

public void run() {
ServerSocket ss;
String ip = "";
try {
ip = InetAddress.getLocalHost().getHostAddress();
} catch (UnknownHostException e1) {
e1.printStackTrace();
}
String xml = "<cross-domain-policy><site-control permitted-cross-domain-policies=\"all\"/>";
xml = xml + "<allow-access-from domain=\"" + ip + "\" to-ports=\"1234\" />";
xml = xml + "</cross-domain-policy>";

try {
ss = new ServerSocket(port);
while (!cancle) {
Socket s = ss.accept();

BufferedReader br = new BufferedReader(new InputStreamReader(s
.getInputStream(), "UTF-8"));
PrintWriter pw = new PrintWriter(s.getOutputStream());
char[] by = new char[22];
br.read(by, 0, 22);
String head = new String(by);
                                     //判断是不是第一求请求连接的安全验证，当客户端连socket时,as3会自动向服务端发送<policy-file-request/>这个字符串请求返回策略文件，所以当服务器收到这个串后给client返回就好了。
                                           //如果是返回xML信息
if (head.equals("<policy-file-request/>")) {
System.out.println("连接服务器");
pw.print(xml + "\0");
pw.flush();
br.close();
pw.close();
} else {
               //你自己的正常请求处理逻辑
}

}
ss.close();
} catch (IOException e) {
e.printStackTrace();
}
}