actionscript3 代码片段4 ――绘制3D bar

代码从openflashchart中取出

    import flash.display.Sprite;
    import flash.filters.DropShadowFilter;
    import flash.geom.Matrix;
   
    /**
    * ...
    * @author DefaultUser (Tools -> Custom Arguments...)
    */
    public class Snippet3D_5 extends Sprite
    {
        private var col:Number = 0x3e4e4;// , 0x3ef43e];
        public function Snippet3D_5()
        {
            var dropShadow:DropShadowFilter = new flash.filters.DropShadowFilter();
            dropShadow.blurX = 5;
            dropShadow.blurY = 5;
            dropShadow.distance = 3;
            dropShadow.angle = 45;
            dropShadow.quality = 2;
            dropShadow.alpha = 0.4;
            this.filters = [dropShadow];
        }
        public function draw3Dbar(w:Number, h:Number,color:Number):void
        {
            this.col = color;
            this.graphics.clear();
            draw_top(w, h);
            draw_front(w, h);
            draw_side(w, h);
        }
        private function draw_top( w:Number, h:Number ):void {
           
            this.graphics.lineStyle(0, 0, 0);
            //set gradient fill
           
            var lighter:Number = Lighten( this.col );
           
            var colors:Array = [this.col,lighter];
            var alphas:Array = [1,1];
            var ratios:Array = [0,255];
            var matrix:Matrix = new Matrix();
            matrix.createGradientBox(w + 12, 12, (270 / 180) * Math.PI );
            this.graphics.beginGradientFill('linear' /*GradientType.Linear*/, colors, alphas, ratios, matrix, 'pad'/*SpreadMethod.PAD*/ );
           
           
            var y:Number = 0;
            if( h<0 )
                y = h;
           
            this.graphics.moveTo(0, y);
            this.graphics.lineTo(w, y);
            this.graphics.lineTo(w-12, y+12);
            this.graphics.lineTo(-12, y+12);
            this.graphics.endFill();
        }
       
        private function draw_front( w:Number, h:Number ):void {
            //
            var rad:Number = 7;
           
            var lighter:Number = Lighten( this.col );

            // Darken a light color
            //var darker:Number = this.colour;
            //darker &= 0x7F7F7F;

            var colors:Array = [lighter,this.col];
            var alphas:Array = [1,1];
            var ratios:Array = [0, 127];
           
            var matrix:Matrix = new Matrix();
            matrix.createGradientBox(w - 12, h+12, (90 / 180) * Math.PI );
            this.graphics.beginGradientFill('linear' /*GradientType.Linear*/, colors, alphas, ratios, matrix, 'pad'/*SpreadMethod.PAD*/ );
           
            this.graphics.moveTo(-12, 12);
            this.graphics.lineTo(-12, h+12);
            this.graphics.lineTo(w-12, h+12);
            this.graphics.lineTo(w-12, 12);
            this.graphics.endFill();
        }
       
        private function draw_side( w:Number, h:Number ):void {
            //
            var rad:Number = 7;
           
            var lighter:Number = Lighten( this.col );
           
            var colors:Array = [this.col,lighter];
            var alphas:Array = [1,1];
            var ratios:Array = [0,255];
            var matrix:Matrix = new Matrix();
            matrix.createGradientBox(w, h+12, (270 / 180) * Math.PI );
            this.graphics.beginGradientFill('linear' /*GradientType.Linear*/, colors, alphas, ratios, matrix, 'pad'/*SpreadMethod.PAD*/ );
           
           
            this.graphics.lineStyle(0, 0, 0);
            this.graphics.moveTo(w, 0);
            this.graphics.lineTo(w, h);
            this.graphics.lineTo(w-12, h+12);
            this.graphics.lineTo(w-12, 12);
            this.graphics.endFill();
        }
        public  function Lighten( col:Number ):Number {
            var rgb:Number = col; //decimal value for a purple color
            var red:Number = (rgb & 16711680) >> 16; //extacts the red channel
            var green:Number = (rgb & 65280) >> 8; //extacts the green channel
            var blue:Number = rgb & 255; //extacts the blue channel
            var p:Number = 2;
            red += red/p;
            if( red > 255 )
                red = 255;
               
            green += green/p;
            if( green > 255 )
                green = 255;
               
            blue += blue/p;
            if( blue > 255 )
                blue = 255;
               
            return red << 16 | green << 8 | blue;
        }
      }

见： http://xiao-yifang.blogspot.com