actionscript3 代码片段2

1，pie切片

            var radius:Number = 100;
            var TO_RADIANS:Number = Math.PI / 180;
            graphics.clear();
            graphics.lineStyle(2, 0x45ef98, 1);
            graphics.beginFill(0xf0f0f0, 1);
            graphics.moveTo(0, 0);
            graphics.lineTo(radius, 0);
           
            var angle:Number = 50;
            var a:Number = Math.tan((angle/2)*TO_RADIANS);
           
            var endx:Number;
            var endy:Number;
            var ax:Number;
            var ay:Number;
           
            endx = radius*Math.cos(angle*TO_RADIANS);
            endy = radius*Math.sin(angle*TO_RADIANS);
            ax = endx+radius*a*Math.cos((angle-90)*TO_RADIANS);
            ay = endy+radius*a*Math.sin((angle-90)*TO_RADIANS);
            graphics.curveTo(ax, ay, endx, endy);
            graphics.endFill();
            graphics.lineTo(0, 0);

2，donut，甜甜圈

var colors:Array = [0x87347e, 0x0000ef, 0x8D6433];
            var alphas:Array = [100, 100, 100];
            var ratios:Array = [0, 110, 255];
            var matrix:Matrix = new Matrix();// { a:300, b:0, c:50, d:0, u:300, v:0, tx: -3, ty:3, w:1 };
            graphics.beginGradientFill("radial", colors, alphas, ratios, matrix);
            drawdonut(86, 36, 100, 94);
            graphics.endFill();
其中drawdonut函数
public function drawdonut(r1:Number, r2:Number, x:Number, y:Number):void {
           var TO_RADIANS:Number = Math.PI/180;
           this.graphics.moveTo(0, 0);
           this.graphics.lineTo(r1, 0);

           // draw the 30-degree segments
           var a:Number = 0.268;  // tan(15)
           var i:Number;
           var endx:Number;
           var endy:Number;
           var ax:Number;
           var ay:Number;
           for ( i=0; i < 12; i++) {
                endx = r1*Math.cos((i+1)*30*TO_RADIANS);
                endy = r1*Math.sin((i+1)*30*TO_RADIANS);
                ax = endx+r1*a*Math.cos(((i+1)*30-90)*TO_RADIANS);
                ay = endy+r1*a*Math.sin(((i+1)*30-90)*TO_RADIANS);
              this.graphics.curveTo(ax, ay, endx, endy);   
            }
 
           // cut out middle (draw another circle before endFill applied)
           this.graphics.moveTo(0, 0);
           this.graphics.lineTo(r2, 0);

           for ( i =0; i < 12; i++) {
                endx = r2*Math.cos((i+1)*30*TO_RADIANS);
                endy = r2*Math.sin((i+1)*30*TO_RADIANS);
                ax = endx+r2*a*Math.cos(((i+1)*30-90)*TO_RADIANS);
                ay = endy+r2*a*Math.sin(((i+1)*30-90)*TO_RADIANS);
              this.graphics.curveTo(ax, ay, endx, endy);   
           }

           this.x = x;
           this.y = y;
        }

效果：