C#专题图代码

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1、privatevoid点密度图ToolStripMenuItem_Click(objectsender,EventArgse){//获取当前图层，并把它设置成IGeoFeatureLayer的实例IMappMap=axMapControl1.Map;ILayerpLayer=pMap.get_Layer(0)asIFeatureLayer;IFeatureLayerpFeatureLayer=pLayerasIFeatureLayer;IGeoFeatureLayerpGeoFeatureLayer=pLayera

2、sIGeoFeatureLayer;//获取图层上的featureIFeatureClasspFeatureClass=pFeatureLayer.FeatureClass;IFeatureCursorpFeatureCursor=pFeatureClass.Search(null,false);IFeaturepFeature=pFeatureCursor.NextFeature();/////////////////////////////////////////////////////////////////

3、///////////////////////////定义点密度图渲染组件IDotDensityRendererDotDensityRenderer=newDotDensityRendererClass();//定义点密度图渲染组件对象的渲染字段对象IRendererFieldsflds=(IRendererFields)DotDensityRenderer;flds.AddField("FID","FID");//flds.AddField("Shape","Shape");//定义点密度图渲染得符号对象IDot

4、DensityFillSymbolddSym=newDotDensityFillSymbolClass();IRgbColorBackColor=newRgbColorClass();BackColor.Red=234;BackColor.Blue=128;BackColor.Green=220;IRgbColorSymbolColor=newRgbColorClass();SymbolColor.Red=234;SymbolColor.Blue=128;SymbolColor.Green=220;////点密度图

5、渲染背景颜色//ddSym.BackgroundColor=BackColor;ddSym.DotSize=8;ddSym.FixedPlacement=true;//ddSym.Color=SymbolColor;ILineSymbolpLineSymbol=newCartographicLineSymbolClass();ddSym.Outline=pLineSymbol;//定义符号数组ISymbolArraysymArray=(ISymbolArray)ddSym;//添加点密度图渲染的点符号到符号数组中去

6、ISimpleMarkerSymbolpMarkerSymbol=newSimpleMarkerSymbolClass();pMarkerSymbol.Style=esriSimpleMarkerStyle.esriSMSCircle;pMarkerSymbol.Size=2;pMarkerSymbol.Color=SymbolColor;;symArray.AddSymbol(pMarkerSymbolasISymbol);//设置点密度图渲染的点符号//DotDensityRenderer.DotDensity

7、Symbol=symArray;DotDensityRenderer.DotDensitySymbol=ddSym;//确定一个点代表多少值DotDensityRenderer.DotValue=0.2;//点密度渲染采用的颜色模式DotDensityRenderer.ColorScheme="Custom";//创建点密度图渲染图例DotDensityRenderer.CreateLegend();//设置符号大小是否固定DotDensityRenderer.MaintainSize=true;//将点密度图渲染

8、对象与渲染图层挂钩pGeoFeatureLayer.Renderer=(IFeatureRenderer)DotDensityRenderer;//刷新地图和TOOCotrolIActiveViewpActiveView=axMapControl1.MapasIActiveView;pActiveView.Refresh();axTOCControl1.Up