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ArcEngine栅格和矢量渲染（含可视化颜色带）

使用ArcEngine9.3开发的栅格和矢量的渲染。
开发环境：ArcEngine9.3，VS2008。
功能：栅格（拉伸和分级）和矢量（简单、唯一值、分级、比例）渲染。
开发界面如图所示。
图1 主界面
图2 栅格渲染界面
图3 矢量渲染界面
部分源码：
  1 public void SimpleRenderer(IFeatureLayer featLayer, string fieldName, IColorRamp colorRamp)
  2         {
  3             IGeoFeatureLayer pGeoFeatureLayer = featLayer as IGeoFeatureLayer;
  4             IFeatureClass pFeatureClass = featLayer.FeatureClass;      //获取图层上的featureClass            
  5             IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false);
  6             IUniqueValueRenderer pUniqueValueRenderer = new UniqueValueRendererClass();   //唯一值渲染器
  7             //设置渲染字段对象
  8             pUniqueValueRenderer.FieldCount = 1;
  9             pUniqueValueRenderer.set_Field(0, fieldName);
 10             ISimpleFillSymbol pSimFillSymbol = new SimpleFillSymbolClass();   //创建填充符号
 11             pUniqueValueRenderer.DefaultSymbol = (ISymbol)pSimFillSymbol;
 12             pUniqueValueRenderer.UseDefaultSymbol = false;
 13             int n = pFeatureClass.FeatureCount(null);
 14             for (int i = 0; i < n; i++)
 15             {
 16                 IFeature pFeature = pFeatureCursor.NextFeature();
 17                 IClone pSourceClone = pSimFillSymbol as IClone;
 18                 ISimpleFillSymbol pSimpleFillSymbol = pSourceClone.Clone() as ISimpleFillSymbol;
 19                 string pFeatureValue = pFeature.get_Value(pFeature.Fields.FindField(fieldName)).ToString();
 20                 pUniqueValueRenderer.AddValue(pFeatureValue, "", (ISymbol)pSimpleFillSymbol);
 21 
 22             }
 23 
 24             //为每个符号设置颜色
 25 
 26             for (int i = 0; i <= pUniqueValueRenderer.ValueCount - 1; i++)
 27             {
 28                 string xv = pUniqueValueRenderer.get_Value(i);
 29 
 30                 if (xv != "")
 31                 {
 32                     ISimpleFillSymbol pNextSymbol = (ISimpleFillSymbol)pUniqueValueRenderer.get_Symbol(xv);
 33                     pNextSymbol.Color = colorRamp.get_Color(127);
 34                     pUniqueValueRenderer.set_Symbol(xv, (ISymbol)pNextSymbol);
 35                 }
 36             }
 37 
 38             pGeoFeatureLayer.Renderer = (IFeatureRenderer)pUniqueValueRenderer;
 39         }
 40 
 41         public void UniqueRenderer(IFeatureLayer featLayer, string fieldName, IColorRamp colorRamp)
 42         {
 43             IGeoFeatureLayer pGeoFeatureLayer = featLayer as IGeoFeatureLayer;
 44             IFeatureClass pFeatureClass = featLayer.FeatureClass;      //获取图层上的featureClass            
 45             IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false);
 46             IUniqueValueRenderer pUniqueValueRenderer = new UniqueValueRendererClass();   //唯一值渲染器
 47             //设置渲染字段对象
 48             pUniqueValueRenderer.FieldCount = 1;
 49             pUniqueValueRenderer.set_Field(0, fieldName);
 50             ISimpleFillSymbol pSimFillSymbol = new SimpleFillSymbolClass();   //创建填充符号
 51             pUniqueValueRenderer.DefaultSymbol = (ISymbol)pSimFillSymbol;
 52             pUniqueValueRenderer.UseDefaultSymbol = false;
 53             int n = pFeatureClass.FeatureCount(null);
 54             for (int i = 0; i < n; i++)
 55             {
 56                 IFeature pFeature = pFeatureCursor.NextFeature();
 57                 IClone pSourceClone = pSimFillSymbol as IClone;
 58                 ISimpleFillSymbol pSimpleFillSymbol = pSourceClone.Clone() as ISimpleFillSymbol;
 59                 string pFeatureValue = pFeature.get_Value(pFeature.Fields.FindField(fieldName)).ToString();
 60                 pUniqueValueRenderer.AddValue(pFeatureValue, "", (ISymbol)pSimpleFillSymbol);
 61 
 62             }
 63 
 64             //为每个符号设置颜色
 65 
 66             for (int i = 0; i <= pUniqueValueRenderer.ValueCount - 1; i++)
 67             {
 68                 string xv = pUniqueValueRenderer.get_Value(i);
 69 
 70                 if (xv != "")
 71                 {
 72                     ISimpleFillSymbol pNextSymbol = (ISimpleFillSymbol)pUniqueValueRenderer.get_Symbol(xv);
 73                     //pColor = ramp.get_Color(j * (ramp.Size - 1) / (count - 1));
 74                     pNextSymbol.Color = colorRamp.get_Color(i * (colorRamp.Size-1) / (pUniqueValueRenderer.ValueCount-1));
 75                     pUniqueValueRenderer.set_Symbol(xv, (ISymbol)pNextSymbol);
 76                 }
 77             }
 78 
 79             pGeoFeatureLayer.Renderer = (IFeatureRenderer)pUniqueValueRenderer;
 80         }
 81 
 82         public void ClassRenderer(IFeatureLayer featLayer, string fieldName, IColorRamp colorRamp, int count)
 83         {
 84             //值分级
 85             IBasicHistogram pBasicHis = new BasicTableHistogramClass();
 86             ITableHistogram pTabHis = (ITableHistogram)pBasicHis;
 87             //贫困发生率
 88             IClassifyGEN pClassify = new EqualIntervalClass();
 89             pTabHis.Field = fieldName;
 90             //IGeoFeatureLayer geolayer = (IGeoFeatureLayer)Layer;
 91             ILayer Layer = (ILayer)featLayer;
 92             ITable pTab = (ITable)Layer;
 93             pTabHis.Table = pTab;
 94             object doubleArrVal, longArrFreq;
 95             pBasicHis.GetHistogram(out doubleArrVal, out longArrFreq);
 96 
 97             int nDes = count;
 98             pClassify.Classify(doubleArrVal, longArrFreq, ref nDes);
 99             object classes = pClassify.ClassBreaks;
100             double[] ClassNum;
101             ClassNum = (double[])pClassify.ClassBreaks;
102             int ClassCountResult = ClassNum.GetUpperBound(0);
103             IClassBreaksRenderer pRender = new ClassBreaksRendererClass();
104             pRender.BreakCount = ClassCountResult;
105             pRender.Field = fieldName;
106             ISimpleFillSymbol pSym;
107             IColor pColor;
108             for (int j = 0; j < ClassCountResult; j++)
109             {
110                 pColor = colorRamp.get_Color(j * (colorRamp.Size-1) / (ClassCountResult-1));
111                 pSym = new SimpleFillSymbolClass();
112                 pSym.Color = pColor;
113                 pRender.set_Symbol(j, (ISymbol)pSym);
114                 pRender.set_Break(j, ClassNum[j + 1]);
115                 pRender.set_Label(j, ClassNum[j].ToString("0.00") + " - " + ClassNum[j + 1].ToString("0.00"));
116             }
117 
118             IGeoFeatureLayer pGeoLyr = (IGeoFeatureLayer)Layer;
119             pGeoLyr.Renderer = (IFeatureRenderer)pRender;
120         }
121 
122         public void ProportionalRenderer(IFeatureLayer featLayer, string fieldName, IColorRamp colorRamp, double count)
123         {
124             IProportionalSymbolRenderer psrender = new ProportionalSymbolRendererClass();
125             psrender.Field = fieldName;
126             psrender.ValueUnit = esriUnits.esriUnknownUnits;
127             psrender.ValueRepresentation = esriValueRepresentations.esriValueRepUnknown;
128             //选择渲染的样式，与颜色 minsymbol为比填内容，否则没有效果
129             ISimpleMarkerSymbol markersym = new SimpleMarkerSymbol();
130             markersym.Size = count;
131             markersym.Style = esriSimpleMarkerStyle.esriSMSCircle;
132             markersym.Color = colorRamp.get_Color(127);
133             psrender.MinSymbol = markersym as ISymbol;
134             //IFeatureLayer featLayer = featLayer;
135             IGeoFeatureLayer geofeat = featLayer as IGeoFeatureLayer;
136             ICursor cursor = ((ITable)featLayer).Search(null, true);
137             IDataStatistics datastat = new DataStatisticsClass();
138             datastat.Cursor = cursor;
139             datastat.Field = fieldName;//千万不能忽视
140             IStatisticsResults statisticsResult;
141             try
142             {
143                 statisticsResult = datastat.Statistics;
144                 psrender.MinDataValue = statisticsResult.Minimum + 0.1;
145                 psrender.MaxDataValue = statisticsResult.Maximum;
146             }
147             catch
148             {
149                 MessageBox.Show("错误，选择的属性不是数值型！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
150             }
151             ////设置background的样式
152             IFillSymbol fillsym = new SimpleFillSymbolClass();
153             fillsym.Color = getcolor(201, 201, 251);
154             ILineSymbol linesym = new SimpleLineSymbolClass();
155             linesym.Width = 1;
156             fillsym.Outline = linesym;
157             psrender.BackgroundSymbol = fillsym;
158             psrender.LegendSymbolCount = 6;//legend的数量
159             psrender.CreateLegendSymbols();//创建TOC的legend
160             geofeat.Renderer = (IFeatureRenderer)psrender;
161         }
完整源码下载：FeatureAndRasterRenderer.rar
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原文地址：https://www.cnblogs.com/zhzhx/p/3594312.html