Flash / Flex / ActionScript/Animation/Frame Event

Add Enter Frame event listener

   <source lang="java">

package {

   import flash.display.Sprite;
   import flash.display.Bitmap;
   import flash.display.BitmapData;
   import flash.text.TextField;
   import flash.events.Event;
   public class Main extends Sprite {
       private var _bitmap:BitmapData= new BitmapData(100, 100, false, 0xffffffff);
       private var _textfield:TextField= new TextField(  );
       public function Main(  ) {
           var image:Bitmap = new Bitmap(_bitmap);
           addChild(image);
           _bitmap.noise(1000, 0, 255, 1|2|4, false);
   
           addChild(_textfield);
           _textfield.y = 100;
   
           addEventListener(Event.ENTER_FRAME, onEnterFrame);
       }
   
       public function onEnterFrame(event:Event):void {
           var colorVal:Number = _bitmap.getPixel(mouseX, mouseY)
           _textfield.text = "#" + colorVal.toString(16).toUpperCase(  );
       }
   }

}

       </source>
   
  

Animating with the ENTER_FRAME Event: Animating a TextField horizontally

   <source lang="java">

package{

   import flash.display.*;
   import flash.text.*;
   import flash.events.*;
   public class Main extends Sprite {
     private var t:TextField;
   
     public function Main(  ) {
       t = new TextField(  );
       t.text          = "Hello";
       t.autoSize      = TextFieldAutoSize.LEFT;
       addChild(t);
   
       addEventListener(Event.ENTER_FRAME, moveTextRight);
     }
   
     public function moveTextRight (e:Event):void {
       t.x += 10;
     }
   }

}

       </source>
   
  

Designated Frame Rate Versus Actual Frame Rate

   <source lang="java">

package {

 import flash.display.*;
 import flash.text.*;
 public class Main extends Sprite {
   public function Main(  ) {
     var t:TextField = new TextField(  );
     trace(stage.frameRate.toString());
   }
 }

}

       </source>
   
  

Measuring the actual frame rate

   <source lang="java">

package {

 import flash.display.*;
 import flash.events.*;
 import flash.utils.*;
 import flash.text.*;
 public class Main extends Sprite {
   private var lastFrameTime:Number;
   private var output:TextField = new TextField(  );
   public function Main() {
     output.autoSize = TextFieldAutoSize.LEFT;
     output.border     = true;
     output.background = true;
     output.selectable = false;
     addChild(output);
     addEventListener(Event.ENTER_FRAME, enterFrameListener);
   }
   private function enterFrameListener (e:Event):void {
     var now:Number = getTimer(  );
     var elapsed:Number = now - lastFrameTime;
     var framesPerSecond:Number = Math.round(1000/elapsed);
     output.text = "Time since last frame: " + elapsed
            + "\nExtrapolated actual frame rate: " + framesPerSecond
            + "\nDesignated frame rate: " + stage.frameRate;
     lastFrameTime = now;
   }
 }

}

       </source>
   
  

Move TextField in animation

   <source lang="java">

package{

   import flash.display.*;
   import flash.text.*;
   import flash.events.*;
   public class Main extends Sprite {
     private var t:TextField;
   
     public function Main() {
       t = new TextField();
       t.text          = "Hello";
       t.autoSize      = TextFieldAutoSize.LEFT;
       addChild(t);
   
       addEventListener(Event.ENTER_FRAME, moveTextRight);
     }
   
     public function moveTextRight (e:Event):void {
         if (t.x <= 300) {
           t.x += 10;
           if (t.x > 300) {
             t.x = 300;
           }
         }
     }
   }

}

       </source>