flash - AS3 : beginGradientFIll() doesn't make me a gradient!

Question

我正在尝试用径向渐变渲染一个圆，但我似乎无法弄清楚。

var bkgdGrad:Shape = new Shape();
bkgdGrad.graphics.beginGradientFill(GradientType.RADIAL, [0x0000FF, 0x00FF00], [1, 1], [0, 255],null,"pad");
bkgdGrad.graphics.drawCircle(0,0,r+200);
bkgdGrad.graphics.endFill();
this.addChild(bkgdGrad);

上面的代码为我呈现了一个实心的绿色圆圈。如果我将颜色后面的数组更改为 [1,0] (alpha 数组)，我会得到透明填充。我似乎无法让 flash 绘制径向渐变，上面的方法对于 GradientType.LINEAR 没有问题

Answer 1

试试这个，也许这会对你有帮助:

package  
{  
    import flash.display.Sprite;  
    import flash.display.GradientType;  
    import flash.geom.Matrix;  

    public class RadialGradient extends Sprite  
    {  
        private var gType:String;  
        private var matrix:Matrix;  

        private var bound:Sprite;  

        public function RadialGradient()  
        {  
            var gType:String = GradientType.RADIAL;  

            var matrix:Matrix = new Matrix();  
            matrix.createGradientBox(550,400,0,0,0);  

            var gColors:Array = [0x0000FF, 0x00FF00];  
            var gAlphas:Array = [1,1];  
            var gRatio:Array = [0,255];  

            var bound:Sprite = new Sprite();  
            bound.graphics.beginGradientFill(gType,gColors,gAlphas,gRatio,matrix);  
            bound.graphics.drawCircle(0,0,r+200);
            bound.x = bound.y = 0;  
            addChild(bound);  
        }  
    }  
}