forked from: forked from: 向心力

...
@author 9re

by 9re 30 Jun 2009

• Forked from 9re's forked from: 向心力
• Diff: 6
• Related works: 3
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// forked from 9re's forked from: 向心力
// forked from 9re's 向心力
package 
{
	import flash.display.MovieClip;
	import flash.display.Shape;
	import flash.events.Event;
	
	/**
	 * ...
	 * @author 9re
	 */
	public class CircularMotion extends MovieClip
	{
		private const KX:Number = 0.05;
                private const KY:Number = 0.07;
                private const C:Number = 2;
		private const R:Number = 150;
		private var _shp:Shape;
               private var _vx:Number = 0;
               private var _vy:Number = 0;
               private var _x:Number = R;
               private var _y:Number = R;
               private var _cx:int;
               private var _cy:int;
		
		public function CircularMotion() 
		{
			_shp = new Shape();
			_shp.graphics.beginFill(0);
			_shp.graphics.drawCircle(0, 0, 15);
			_shp.graphics.endFill();
			
                        _cx = stage.stageWidth / 2;
                        _cy = stage.stageHeight / 2;
                        
			_shp.x = _cx + R;
			_shp.y = _cy + R;
			
			graphics.lineStyle(1, 0xff0000, 0.4);
			graphics.moveTo(_shp.x, _shp.y);
			
			
			addChild(_shp);
			
			addEventListener(Event.ENTER_FRAME, enterFrameHandler);
		}
		
		private function enterFrameHandler(e:Event):void 
		{
			
                        _vx -= (_shp.x - _cx) * KX + C * _x;
                        _x += _vx;
                        _vy -= (_shp.y - _cy) * KY + C * _y;
                        _y += _vy;
                        _shp.x = _cx + _x;
                        _shp.y = _cy + _y;
			//_shp.y += (_shp.x - stage.stageWidth / 2) * K;
			
			graphics.lineTo(_shp.x, _shp.y);
		}
		
	}
	
}