/// <summary>
        /// draw, 決定要畫什麼在 window 上
        /// </summary>
        /// <param name="window">Halcon Window</param>
        public override void draw(HalconDotNet.HWindow window)
        {
            double arrowSize = 2;
            //double crossSize = 12;
            //double crossAngle = 0.785398;

            HTuple dotLineStyle = new HTuple(new int[4] {
                7, 7, 7, 7
            });

            //Reset line Style
            HOperatorSet.SetLineStyle(window, null);

            //寫字
            if (!String.IsNullOrEmpty(Name))
            {
                if (!this.IsActive)
                {
                    HOperatorSet.SetColor(window, "red");
                }

                HOperatorSet.SetTposition(window, this.NewCenterRow, this.NewCenterCol);
                window.WriteString(Name);
            }


            //畫線段,水平 + 30 度角
            var lineLength = 50;
            var angle      = Math.PI / 6.0;
            var hLineRow   = this.NewCenterRow + Math.Sin(Math.PI) * lineLength;
            var hLineCol   = this.NewCenterCol - Math.Cos(Math.PI) * lineLength;
            var degLineRow = this.NewCenterRow - Math.Sin(angle) * lineLength;
            var degLineCol = this.NewCenterCol + Math.Cos(angle) * lineLength;

            HOperatorSet.DispLine(window, this.NewCenterRow, this.NewCenterCol, hLineRow, hLineCol);
            HOperatorSet.DispLine(window, this.NewCenterRow, this.NewCenterCol, degLineRow, degLineCol);

            //畫 arc
            // angle 為正時,會順時針畫,
            // angle 為負時,會逆時針畫,
            // 因此要注意兩線段夾角的開口方向來選擇
            var arcBeginRow = this.NewCenterRow - Math.Sin(angle) * (lineLength / 2.0);
            var arcBeginCol = this.NewCenterCol + Math.Cos(angle) * (lineLength / 2.0);

            window.DispArc(this.NewCenterRow, this.NewCenterCol, angle, arcBeginRow, arcBeginCol);

            // 畫箭頭,
            window.SetLineWidth(1);
            HOperatorSet.SetLineStyle(window, dotLineStyle);

            window.DispArrow(this.NewCenterRow, this.NewCenterCol, _lineACenterRow, _lineACenterCol, arrowSize);
            window.DispArrow(this.NewCenterRow, this.NewCenterCol, _lineBCenterRow, _lineBCenterCol, arrowSize);

            //Reset line Style
            HOperatorSet.SetLineStyle(window, null);

            //畫ROI
            window.SetLineWidth(2);
            if (!this.IsActive)
            {
                HOperatorSet.SetColor(window, "magenta");
            }

            for (var i = 0; i < _lines.Count; i++)
            {
                var line = _lines[i];
                if (isLine(line))
                {
                    //draw line,ROI 的線
                    window.DispLine(line.RowBegin, line.ColBegin, line.RowEnd, line.ColEnd);
                }
            }
        }