DotDensityRenderer_.NET_编程开发_程序员俱乐部

关键之处在于获取每个点所代表的的值 这里使用geodatabase类库中idatastatistic接口进行统计字段，再将结果传递给esrisysytem.istatisticsResult进行.

需用到引用

1 using ESRI.ArcGIS.Display;
2 using ESRI.ArcGIS.Carto;
3 using ESRI.ArcGIS.esriSystem;
4 using ESRI.ArcGIS.Geodatabase;

代码

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 1 private void dotToolStripMenuItem_Click(object sender, EventArgs e)
 2         {
 3 IGeoFeatureLayer pLayer = this.axMapControl1.get_Layer(0)as IGeoFeatureLayer;
 4             ITable pTable = pLayer.FeatureClass as ITable;
 5             IQueryFilter pQueryFilter=new QueryFilterClass();
 6             pQueryFilter.AddField("PERIMETER");
 7             ICursor pCursor = pTable.Search(pQueryFilter, true);
 8             IDataStatistics pDataStatistics = new DataStatisticsClass();
 9             pDataStatistics.Cursor = pCursor;//数据来源
10             pDataStatistics.Field = "PERIMETER";
11             IStatisticsResults pStatisticsResult = pDataStatistics.Statistics;
12             double Dvalues = (pStatisticsResult.Minimum+pStatisticsResult.Maximum)/10;//根据情况而定
13 
14             IDotDensityRenderer pDotDensityRenderer=new DotDensityRendererClass();
15 
16             IRendererFields pRendererField = pDotDensityRenderer as IRendererFields;
17             pRendererField.AddField("PERIMETER", "PERIMETER");
18 
19             IDotDensityFillSymbol pDotDensityFillSymbol = new DotDensityFillSymbolClass();
20             pDotDensityFillSymbol.DotSize =1;
21             pDotDensityFillSymbol.BackgroundColor = GetRgbColor(100, 100, 100);
22             pDotDensityFillSymbol.Color = GetRgbColor(255, 200, 0);
23 
24             ISymbolArray pSymbolArray = pDotDensityFillSymbol as ISymbolArray;
25             ISimpleMarkerSymbol pMarkerSymbol = new SimpleMarkerSymbolClass();
26             pMarkerSymbol.Color = GetRgbColor(255, 0, 0);
27             pMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSDiamond;
28             pMarkerSymbol.Size = 10;
29             pSymbolArray.AddSymbol(pMarkerSymbol as ISymbol);
30 
31             pDotDensityRenderer.DotDensitySymbol = pDotDensityFillSymbol;
32             pDotDensityRenderer.DotValue = Dvalues;
33             pDotDensityRenderer.CreateLegend();
34 
35             pLayer.Renderer = pDotDensityRenderer as IFeatureRenderer;
36             this.axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
37             this.axTOCControl1.Update();
38 
39            
40 
41         }

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