// Pure AS3 RSS Icon
// See: http://d.hatena.ne.jp/nitoyon/20070830/rss_icon_as3
// Special Thanks: http://www.drweb.de/photoshop/rss-icon.shtml
package
{
    import flash.display.*;
    import flash.filters.*;
    import flash.geom.*;

[SWF(width="128", height="128")]
    public class RssIcon extends Sprite
    {
        private const SIZE:int = 128;
        private const ROUND:int = 48;
        
        public function RssIcon():void
        {
            stage.scaleMode = "noScale";

var matrix:Matrix = new Matrix();
            matrix.createGradientBox(SIZE, SIZE, Math.PI * 1 / 4);

var glowFilter:GlowFilter = new GlowFilter(0xffffbe, 0.75);
            glowFilter.inner = true;

// 外側の角円四角
            var base:Shape = new Shape();
            base.graphics.beginFill(0xcc6611);
            base.graphics.drawRoundRect(0, 0, SIZE, SIZE, ROUND, ROUND);
            base.graphics.endFill();
            addChild(base);

// 内側の角円四角
            var base2:Shape = new Shape();
            base2.graphics.beginFill(0xee7722);
            base2.graphics.drawRoundRect(1, 1, SIZE - 2, SIZE - 2, ROUND - 1, ROUND - 1);
            base2.graphics.endFill();
            base2.filters = [glowFilter];
            addChild(base2);

// グラデーション
            var gross:Shape = new Shape();
            gross.graphics.beginGradientFill("linear", [0xffffff, 0x000000], [0.2, 0.2], [0, 255], matrix);
            gross.graphics.drawRoundRect(0, 0, SIZE, SIZE, ROUND, ROUND);
            gross.graphics.endFill();
            gross.graphics.beginGradientFill("linear", [0xffffff, 0xffffff, 0xffffff], [0, 0.2, 0], [0, 112, 255], matrix);
            gross.graphics.drawRoundRect(0, 0, SIZE, SIZE, ROUND, ROUND);
            gross.graphics.endFill();
            gross.blendMode = BlendMode.OVERLAY;
            addChild(gross);

// ●
            var white:Shape = new Shape();
            white.graphics.beginFill(0xffffff);
            white.graphics.drawCircle(36, 96, 12);
            white.graphics.endFill();

// ))
            drawPattern3(white.graphics);

addChild(white);
        }

private function drawPattern3(g:Graphics):void
        {
            g.beginFill(0xffffff);
            drawPie(g, 24, 106, 56, -Math.PI / 2, 0);
            drawPie(g, 24, 106, 40, -Math.PI / 2, 0);
            g.endFill();

g.beginFill(0xffffff);
            drawPie(g, 24, 106, 86, -Math.PI / 2, 0);
            drawPie(g, 24, 106, 70, -Math.PI / 2, 0);
            g.endFill();
        }

// 弧を描くメソッド
        // (参考) http://www.fumiononaka.com/TechNotes/Flash/FN0506002.html
        private function arcTo(g:Graphics, x:Number, y:Number, radius:Number, startAngle:Number, endAngle:Number):void
        {
            var clockwise:Boolean = startAngle < endAngle;

g.lineTo(x + radius * Math.cos(startAngle), y + radius * Math.sin(startAngle));
            
            while(clockwise && startAngle < endAngle || !clockwise && startAngle > endAngle)
            {
                var nextAngle:Number = clockwise ? Math.min(endAngle, startAngle + Math.PI / 4)
                                                 : Math.max(endAngle, startAngle - Math.PI / 4);

var nextPos:Point = new Point(
                    Math.cos(nextAngle) * radius, 
                    Math.sin(nextAngle) * radius);

var controlPos:Point = new Point(
                    radius * Math.tan((nextAngle - startAngle) / 2) * Math.cos(nextAngle - Math.PI / 2),
                    radius * Math.tan((nextAngle - startAngle) / 2) * Math.sin(nextAngle - Math.PI / 2)
                    );

g.curveTo(x + nextPos.x + controlPos.x, y + nextPos.y + controlPos.y, x + nextPos.x, y + nextPos.y);

startAngle = nextAngle;
            }
        }

// 扇形を描くメソッド
        private function drawPie(g:Graphics, x:Number, y:Number, radius:Number, startAngle:Number, endAngle:Number):void
        {
            g.moveTo(x, y);
            arcTo(g, x, y, radius, startAngle, endAngle);
        }
    }
}