waysun一路陽光

源自網友，非原創。
       //箭頭的大小
        public var Radius:int=6;
        //線性的顏色
        public var LineColor:uint=0x000000;
        //是否需要畫箭頭
        public var NeedArrow:Boolean=true;

       private function GetAngle():int
        {
            var tmpx:int=endX-startX ;
            var tmpy:int=startY -endY ;
            var angle:int= Math.atan2(tmpy,tmpx)*(180/Math.PI);
            return angle;
        }

  //畫直線--包括是否畫箭頭
  public function draw(): void
  {
   this.graphics.clear();//清除前面畫的東東
   
   //畫線
   this.graphics.lineStyle(thickness, lineColor);
   this.graphics.moveTo(startX, startY);
   this.graphics.lineTo(endX, endY);

   
    /**-------------------畫箭頭算法----------------------*/
            if(NeedArrow)
            {
                var angle:int= GetAngle();
                var centerX:int=endX-Radius * Math.cos(angle *(Math.PI/180)) ;
                var centerY:int=endY+Radius * Math.sin(angle *(Math.PI/180)) ;
                var topX:int=endX ;
                var topY:int=endY  ;
               
                var leftX:int=centerX + Radius * Math.cos((angle +120) *(Math.PI/180))  ;
                var leftY:int=centerY - Radius * Math.sin((angle +120) *(Math.PI/180))  ;
               
                var rightX:int=centerX + Radius * Math.cos((angle +240) *(Math.PI/180))  ;
                var rightY:int=centerY - Radius * Math.sin((angle +240) *(Math.PI/180))  ;
               
                this.graphics.beginFill(LineColor,1);
               
                this.graphics.lineStyle(1,LineColor,1);
               
                this.graphics.moveTo(topX,topY);
                this.graphics.lineTo(leftX,leftY);
               
                this.graphics.lineTo(centerX,centerY);
               
                this.graphics.lineTo(rightX,rightY);
                this.graphics.lineTo(topX,topY);
                this.graphics.endFill();
            }

  }