AE分级渲染

分级渲染classbreakrenderer位于carto类库中，进行分级渲染时，首先要将相应图层按照某一Field分级。可使用esrisystem类库中的iclassifyGEN类的classify进行分类

 private ISymbol GetSymbol(IColor pColor)
         {
             ISymbol pSymbol;
             ISimpleFillSymbol pSymbolFillSymbol = new SimpleFillSymbolClass();
             pSymbolFillSymbol.Color = pColor;
             pSymbol = pSymbolFillSymbol as ISymbol;
             return pSymbol;
         }

         private void classBreakRendererToolStripMenuItem_Click(object sender, EventArgs e)
         {
             double[] classes;
             IGeoFeatureLayer pGeoFeatureLayer = this.axMapControl1.get_Layer() as IGeoFeatureLayer;
             ITable pTable = pGeoFeatureLayer.FeatureClass as ITable;//Itable接口位于Geodabase类库中
             ITableHistogram pTableHistogram = new BasicTableHistogramClass();
             IBasicHistogram pBasicHistogram = pTableHistogram as IBasicHistogram;
             pTableHistogram.Field = "PERIMETER";
             pTableHistogram.Table = pTable;
             object dataValues;
             object dataFrequent;

             pBasicHistogram.GetHistogram(out dataValues, out dataFrequent);//获取FeatureClass中的dataValues和datafrequent

             IClassifyGEN pClassifyGEN = new EqualIntervalClass();

             int classCount = ;
             pClassifyGEN.Classify(dataValues, dataFrequent, ref classCount);//根据上面的dataValues和datafrequent进行分级，分级数为classcout

             classes = (double[])pClassifyGEN.ClassBreaks;//获取分段点

             IClassBreaksRenderer pClassBreakRenderer = new ClassBreaksRenderer();
             pClassBreakRenderer.BreakCount = ;//断点数
             pClassBreakRenderer.Field = "PERIMETER";
             pClassBreakRenderer.SortClassesAscending = true;//按顺序排列

             IAlgorithmicColorRamp pColorRamp = new AlgorithmicColorRampClass();
             IRgbColor pRgbColor1 = new RgbColorClass();
             IRgbColor pRgbColor2 = new RgbColorClass();
             pRgbColor1.Red = ;
             pRgbColor1.Green = ;
             pRgbColor1.Blue = ;
             pRgbColor2.Red = ;
             pRgbColor2.Green = ;
             pRgbColor2.Blue = ;
             pColorRamp.FromColor = pRgbColor2;
             pColorRamp.ToColor = pRgbColor1;
             pColorRamp.Size = ;//颜色带范围
             bool ok=true;
             pColorRamp.CreateRamp(out ok);
             IEnumColors pEnumColors = pColorRamp.Colors;
             for (int i = ; i < classCount; i++)
             {
                 IColor pColor = pEnumColors.Next();
                 ISymbol pSymbol = GetSymbol(pColor);

                 pClassBreakRenderer.set_Symbol(i, pSymbol);
                 pClassBreakRenderer.set_Label(i, classes[i].ToString() + "-" + classes[i + ].ToString());
                 pClassBreakRenderer.set_Break(i, classes[i+]);

             }
             pGeoFeatureLayer.Renderer = pClassBreakRenderer as IFeatureRenderer;
             this.axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);
             axTOCControl1.Update();

         }

过程中需要注意的：1、分级和渲染的具体字段需指明，本例以PERIMETER字段分级和渲染    2、颜色带的size需具体指定