グラデーションの練習

/**
 * Copyright hacker_szoe51ih ( http://wonderfl.net/user/hacker_szoe51ih )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/4TLR
 */

package {
    import flash.display.*;
    import flash.events.*;
    
    [SWF(width="465",height="465",backgroundColor="0xffffff",fps="45")]
    
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
    	
    	public var myBall:Ball;
    	public var centerX:Number=stage.stageWidth/2;
    	public var centerY:Number=stage.stageHeight/2;
    	
        public function FlashTest() {
           
           init();
            
        }
        
        public function init():void{
        	
        	myBall=new Ball(0xccccff,0x2255ff,0x1111ff,50);
        	addChild(myBall);
        	myBall.x=centerX;
        	myBall.y=centerY;
        	
        }
        
    }
}

import flash.display.*;
import flash.geom.Matrix;
class Ball extends Sprite{
	
	public var type:String;
	public var colors:Array;
	public var alphas:Array;
	public var rations:Array;
	public var spread:String;
	public var interpolation:String;
	public var focalPoint:Number;
	public var mtx:Matrix;
	
	public function Ball(color1:uint,color2:uint,lineColor:uint,r:Number){
		
		//グラデーションのパラメーターを作る
		//引数1
		type=GradientType.RADIAL;
		//引数2
		colors=[color1,color2];
		//引数3
		alphas=[1,1]
		//引数4
		rations=[0,255];
		//引数5
		mtx=new Matrix();
		mtx.createGradientBox(2*r,2*r,0,0,0);//幅、高さ、方向を指定する角度、水平移動ピクセル数、垂直移動ピクセル数
		mtx.translate(-r,-r);//グラデーションの開始位置を中心にもってくる
		mtx.rotate(Math.PI/4);
		//引数6
		spread=SpreadMethod.PAD;
		//引数7
		interpolation="rgb"
		//引数8
		focalPoint=0//グラデーションの焦点の位置
		graphics.beginGradientFill(type,colors,alphas,rations,mtx,spread,interpolation,focalPoint);
		
		//図形を描く
		graphics.lineStyle(1,lineColor);
		graphics.drawCircle(0,0,r);
		graphics.endFill();		
		
	}
	
}