MARKUS

        /// return Polygon's area

        /// </summary>

        /// <author>humkyung</author>

        /// <date>2019.06.13</date>

        public override Rect ItemRect

        {

            get

            {

                double dMinX = double.MaxValue;

                double dMinY = double.MaxValue;

                double dMaxX = double.MinValue;

                double dMaxY = double.MinValue;

                foreach (Point pt in this.PointSet)

                {

                    dMinX = Math.Min(dMinX, pt.X);

                    dMinY = Math.Min(dMinY, pt.Y);

                    dMaxX = Math.Max(dMaxX, pt.X);

                    dMaxY = Math.Max(dMaxY, pt.Y);

                }

                return new Rect(new Point(dMinX, dMinY), new Point(dMaxX, dMaxY));

            }

        }

        /// <summary>