显示节点--3s4d

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显示节点

By 3s4d 发表于 2007-7-28 12:57:00

这段程序的功能是像下图一样把地图中的线或面的节点显示出来.
   private voidShowVertex(IScreenDisplayscreenDisplay, IFeaturefeature)
      {
         ISimpleMarkerSymbolvertexMarkerSymbol = newSimpleMarkerSymbolClass(); //用来设置节点样式
         ISimpleMarkerSymbolendPointMarkerSymbol = newSimpleMarkerSymbolClass(); //用来设置首尾节点样式
         IRgbColorvertexColor = newRgbColorClass(); //节点颜色
         IRgbColorendPointColor = newRgbColorClass(); //首尾节点颜色
         IPathpath = newPathClass();
         IListendPointCol = newArrayList();
         doublevertexMarkerSize = 2;
         doubleendPointMarkerSize = 2;
         vertexColor.Green = 255;
         endPointColor.Red = 255;
         vertexMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSSquare;
         vertexMarkerSymbol.Size = vertexMarkerSize;
         vertexMarkerSymbol.Angle = 0;
         vertexMarkerSymbol.Color = vertexColor;
         endPointMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSSquare;
         endPointMarkerSymbol.Size = endPointMarkerSize;
         endPointMarkerSymbol.Angle = 0;
         endPointMarkerSymbol.Color = endPointColor;
         endPointCol.Clear();
         if (feature.Shape.GeometryType == esriGeometryType.esriGeometryPolyline
            || feature.Shape.GeometryType == esriGeometryType.esriGeometryPolygon)
         {
            //从Geometry得到GeomegryCollection
            IGeometryCollectiongeoCol = (IGeometryCollection)feature.Shape;
            intgeomsize = geoCol.GeometryCount;
            for (int lgeom = 0; lgeom < geomsize; lgeom++)
            {
                  //从GeometryCollection得到SegmentCollection
                  ISegmentCollectionsegCol = (ISegmentCollection)geoCol.get_Geometry(lgeom);
                  path = (IPath)geoCol.get_Geometry(lgeom);
                  endPointCol.Add(path.FromPoint); //得到首尾节点
                  endPointCol.Add(path.ToPoint);
                  intsegsize = segCol.SegmentCount;
                  for(intlseg = 0; lseg < segsize; lseg++)
                  {//重画节点
                     ISegmentsegment = segCol.get_Segment(lseg); //从SegmentCollection得到Segment
                     screenDisplay.StartDrawing(screenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
                     screenDisplay.SetSymbol((ISymbol)vertexMarkerSymbol);
                     screenDisplay.DrawPoint(segment.FromPoint);       //重画Segment的端点
                     screenDisplay.DrawPoint(segment.ToPoint);
                     screenDisplay.FinishDrawing();
                  }
            }
         }
         intendsize = endPointCol.Count;
         for(intlend = 0; lend < endsize; lend++)
         {//重画首尾节点
            IPointendpoint = (IPoint)endPointCol[lend];
            screenDisplay.StartDrawing(screenDisplay.hDC, (short)esriScreenCache.esriNoScreenCache);
            screenDisplay.SetSymbol((ISymbol)endPointMarkerSymbol);
            screenDisplay.DrawPoint(endpoint);
            screenDisplay.FinishDrawing();
         }
      }

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