Point.distance()は重い

by CoremindJP 25 Mar 2010

Tags

高速化
Embed

/**
 * Copyright CoremindJP ( http://wonderfl.net/user/CoremindJP )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/h09p
 */

package {
    import flash.geom.Point;
    import flash.display.Sprite;
    import flash.utils.getTimer;
    import flash.text.TextField;
    public class FlashTest extends Sprite {
        public var
        		_resultValue:Number,
        		_result1:TextField = new TextField(),
        		_result2:TextField = new TextField(),
        		_time:int,
        		_repeat:uint = 10000,
     		_pointA:Point = new Point(),
     		_pointB:Point = new Point();
        
        public function FlashTest(){
        		_result1.width = 425;
        		_result2.width = 425;
			addChild( _result1 );        	
			addChild( _result2 );
        		
        		//Point.distance
			_time = getTimer();
            for (var i:int = 0; i < _repeat; i++) 
            {
                _pointA.x = 500;
                _pointA.y = 600;
                _pointB.x = 700;
                _pointB.y = 800;
                
                _resultValue = Point.distance( _pointA, _pointB );
            }
            _result1.text = "Point.distance = " + String(getTimer() - _time) + "ms\n" + "\tresult = " + _resultValue;
            
        		_result2.y = _result1.textHeight;
            //Math.sqrt
            _time = getTimer();
            var _x:int, _y:int;
            for (i = 0; i < _repeat; i++) 
            {
                _pointA.x = 500;
                _pointA.y = 600;
                _pointB.x = 700;
                _pointB.y = 800;
                
                _x = _pointA.x - _pointB.x;
                _y = _pointA.y - _pointB.y;
                _resultValue = Math.sqrt( _x * _x + _y * _y );
            }
            _result2.text = "Math.sqrt = " + String(getTimer() - _time) + "ms\n" + "\tresult = " + _resultValue;
       }
    }
}