建立一個點狀注記（MarkerElement）

1.根據XY建立一個點

 /// <summary>

        /// 根據x y建立新點

        /// </summary>

        /// <param name="dX">x坐标值</param>

        /// <param name="dY">y坐标值</param>

        /// <returns>傳回點要素</returns>

        /// <remarks></remarks>

        public static IPoint GetPntFromXY(double dX, double dY)

        {

            IPoint pPnt = new PointClass();

            pPnt.PutCoords(dX, dY);

            return pPnt;

        }

2.建立MarkerElement

IElement pele = new MarkerElementClass();

                       

pele.Geometry = GetPntFromXY(x, y);

IMarkerSymbol sym = new SimpleMarkerSymbolClass();

sym.Color = ColorCustom(rDefault, gDefault, bDefault);

sym.Size = 4;

(pele as IMarkerElement).Symbol = sym;