1. #region 生成点的三种方法
    2.         /// <summary>
    3.         /// 1.直接在mapcontrol视窗中画点，不能常驻
    4.         /// </summary>
    5.         private void DrawPoint()
    6.         {
    7.             //获得当前活动范围
    8.             IActiveView pActiveView = axMapControl1.ActiveView;
    9.             //开始画笔 
    10.             pActiveView.ScreenDisplay.StartDrawing(pActiveView.ScreenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
    11.             IPoint pPoint;
    12.             //定义简单marker元素的标志
    13.             ISimpleMarkerSymbol pSymbol = new SimpleMarkerSymbolClass();
    14.             //设置颜色            
    15.             IRgbColor pRGBcolor = new RgbColorClass();
    16.             pRGBcolor.Red = 255;
    17.             pRGBcolor.Green = 255;
    18.             pRGBcolor.Blue = 0;
    19.             pSymbol.Color = pRGBcolor;
    20.             //形状为圆形
    21.             pSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle;
    22.             pSymbol.Size = 15;
    23.             pSymbol.Angle = 270;
    25.             //最后实现的时候要用ISymbol来实现，所以还是要做个转换
    26.             ISymbol pPointSymbol = pSymbol as ISymbol;
    27.             //该点是用来设置坐标的
    28.             pPoint = new PointClass();
    29.             pPoint.PutCoords(300, 300);
    31.             pActiveView.ScreenDisplay.SetSymbol((ISymbol)pPointSymbol);
    32.             pActiveView.ScreenDisplay.DrawPoint(pPoint);
    33.             //结束画笔
    34.             pActiveView.ScreenDisplay.UpdateWindow();
    35.             pActiveView.ScreenDisplay.FinishDrawing();
    37.         }
    39.         /// <summary>
    40.         /// 2.用element画点
    41.         /// </summary>
    42.         private void DrawPointElement(TopologyElement.Point p)
    43.         {
    44.             //首先要实现容器接口
    45.             IGraphicsContainer pGraphicsContainer = axMapControl1.ActiveView as IGraphicsContainer;
    46.             pGraphicsContainer.DeleteAllElements();//清空容器里面所有的元素
    48.             //设置点的坐标
    49.             IPoint pPoint = new PointClass();
    50.             //pPoint.PutCoords(310, 310);
    51.             //pPoint.PutCoords(310, 310);
    52.             //pPoint.PutCoords(440475, 4655187);
    53.             pPoint.X = p.X;
    54.             pPoint.Y = p.Y;
    55.             pPoint.X = 122.280739;
    56.             pPoint.Y = 42.0464883;
    57.             int forx = 0;
    58.             int fory = 0;
    59.             ESRI.ArcGIS.Display.IScreenDisplay screenDisplay = axMapControl1.ActiveView.ScreenDisplay;
    60.             ESRI.ArcGIS.Display.IDisplayTransformation displayTransformation = screenDisplay.DisplayTransformation;
    61.             displayTransformation.FromMapPoint(pPoint, out forx, out fory);//输出的forx,fory为屏幕坐标
    63.             //pPoint = this.axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(440475, 4655187);
    64.             //pPoint.PutCoords(pPoint.X,pPoint.Y);
    65.             //pPoint.PutCoords(122.280739, 42.0464883);
    66.             //int x, y;
    67.             //axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.FromMapPoint(pPoint, out x, out y);
    69.             //axMapControl1.ActiveView.ScreenDisplay.DisplayTransformation.FromMapPoint(440475, 4655187);
    73.             //IMarkerElement用来获得symbol属性
    74.             IMarkerElement pMarkerElement = new MarkerElementClass();
    76.             //用ISimpleMarkerSymbol来设置点的属性
    77.             ISimpleMarkerSymbol pSymbol = new SimpleMarkerSymbolClass();
    78.             IRgbColor pRGBcolor = new RgbColorClass();
    79.             //设置颜色的时候使用计算机RGB
    80.             //红色
    81.             //pRGBcolor.Red = 255;
    82.             //pRGBcolor.Green = 0;
    83.             //pRGBcolor.Blue = 0;
    84.             //黑色
    85.             pRGBcolor.Red = 0;
    86.             pRGBcolor.Green = 0;
    87.             pRGBcolor.Blue = 0;
    88.             //pRGBcolor.NullColor = true;
    89.             pSymbol.Color = pRGBcolor;//红色
    90.             //pSymbol.Color = pRGBcolor;//红色
    91.             pMarkerElement.Symbol = pSymbol;
    93.             //IElement用来获得Geometry属性
    94.             IElement pElement = pMarkerElement as IElement;
    97.             //把IPoint转换为为IGeoMetry也能实现
    98.             //IGeometry pGeometry = pPoint as IGeometry;
    99.             //pElement.Geometry = pGeometry;
    100.             pElement.Geometry = pPoint;
    102.             //在容器里添加元素
    103.             pGraphicsContainer.AddElement(pElement, 0);
    104.             pElement.Activate(axMapControl1.ActiveView.ScreenDisplay);
    105.             axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, pElement, null);
    107.         }