3 Step Animation - Rounded Rectangle

/**
 * Copyright WLAD ( http://wonderfl.net/user/WLAD )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/u69S
 */

package {import flash.display.Sprite;public class FlashTest extends Sprite {public function FlashTest() {
///////////////////////////////////////    
      
x = 100;
y = 80;
     
var frame:int = 0;
var total_frames:int = stage.frameRate * 3;

var val:Number = 0;
var width:Number = 300;
var height:Number = 200;

var r:Number = 0;

addEventListener('enterFrame', function(_:*):void
{
	if ( ++frame > total_frames ) frame = 0;
	val = frame / total_frames;
	
	graphics.clear();
	graphics.beginFill(0xFF0000);
	
	if ( val < 0.333 ) 
	{
		r = val / 0.333;
		
		graphics.drawRoundRect( 0, 0, width, height, r * height );
	}
	else if ( val < 0.666 ) 
	{
		r = ( val - 0.333 ) / 0.333;
		
		var diff:Number = width - height;
		
		graphics.drawRoundRect( r * diff * 0.5 , 0, width - r * diff , height, height );
	}
	else
	{
		r = 0.5* (1-(val- 0.666) / 0.333);
		graphics.drawCircle( width >> 1, height >> 1, r * height );
	}
	
	graphics.endFill();


///////////////////////////////////////
});}}}