Draw Stars

星型を描きます。三角関数の勉強用。

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license : MIT License
modified : 2011-03-17 11:24:44

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package {
    import flash.display.AVM1Movie;
    import flash.geom.Point;
    import flash.ui.Mouse;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        public function FlashTest() {
            // write as3 code here..
            this.drawStyledStar(200, 50, 100);
            this.drawStyledStar(400, 150, 50);      
            
        }
    private function drawStyledStar(x:Number, y:Number, width:Number)
    {
            this.drawStarWith(x,y, width,20,0x000000);
            this.drawStarWith(x,y, width,10,0x0000ff);
            this.drawStarWith(x,y, width,2,0x00ff00);
        
    }

private function drawStarWith(x:Number, y:Number, width:Number, lineB:Number, lineC:Number):void{
            graphics.lineStyle(lineB, lineC);
            drawStar(x,y,width);
    }
    
    private function drawStar(x:Number, y:Number, width:Number):void {
            var d:Number = Math.PI / 180;
            graphics.moveTo(x,y);
            var rightBottomX:Number = x + Math.sin(18 * d) * width;
            var rightBottomY:Number = y + Math.cos(18 * d) * width;
            var rightBottom:Point = new Point();
            rightBottom.x = x + Math.sin(18 * d) * width;
            rightBottom.y = y + Math.cos(18 * d) * width;
            
            var leftBottom:Point = new Point();
            leftBottom.x = x - Math.sin(18 * d) * width;
            leftBottom.y = y + Math.cos(18 * d) * width;
            
            var rightShoulder:Point = new Point();
            rightShoulder.x = leftBottom.x + Math.sin((36 + 18) * d) * width ;
            rightShoulder.y = leftBottom.y - Math.cos((36 + 18) * d) * width;
            
            var leftShoulder:Point = new Point();
            leftShoulder.x = rightBottom.x - Math.sin((36 + 18) * d) * width;
            leftShoulder.y = rightBottom.y - Math.cos((36 + 18) * d) * width;
                        
            graphics.lineTo(rightBottom.x ,rightBottom.y);
            graphics.lineTo(leftShoulder.x, leftShoulder.y);  
            graphics.lineTo(rightShoulder.x, rightShoulder.y);  
            graphics.lineTo(leftBottom.x ,leftBottom.y);            
            graphics.lineTo(x,y);

//            graphics.lineTo(x + Math.cos(d / 2) * width ,y + Math.sin(s / 2) * width);
            //graphics.lineTo(x,y);
        }
    }

}

class Point{
        public function Point()
        {
        }

public var x:Number;
        public var y:Number;
    }

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ブラウザで無料ではじめるas3　P.28

by satrex
at 2011/03/06 09:15:04