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：

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public void SimpleRenderer(IFeatureLayer featLayer, string fieldName, IColorRamp colorRamp) { IGeoFeatureLayer pGeoFeatureLayer = featLayer as IGeoFeatureLayer; IFeatureClass pFeatureClass = featLayer.FeatureClass; //获取图层上的featureClass IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false); IUniqueValueRenderer pUniqueValueRenderer = new UniqueValueRendererClass(); //唯一值渲染器 //设置渲染字段对象 pUniqueValueRenderer.FieldCount = 1; pUniqueValueRenderer.set_Field(0, fieldName); ISimpleFillSymbol pSimFillSymbol = new SimpleFillSymbolClass(); //创建填充符号 pUniqueValueRenderer.DefaultSymbol = (ISymbol)pSimFillSymbol; pUniqueValueRenderer.UseDefaultSymbol = false; int n = pFeatureClass.FeatureCount(null); for (int i = 0; i < n; i++) { IFeature pFeature = pFeatureCursor.NextFeature(); IClone pSourceClone = pSimFillSymbol as IClone; ISimpleFillSymbol pSimpleFillSymbol = pSourceClone.Clone() as ISimpleFillSymbol; string pFeatureValue = pFeature.get_Value(pFeature.Fields.FindField(fieldName)).ToString(); pUniqueValueRenderer.AddValue(pFeatureValue, "", (ISymbol)pSimpleFillSymbol); } //为每个符号设置颜色 for (int i = 0; i <= pUniqueValueRenderer.ValueCount - 1; i++) { string xv = pUniqueValueRenderer.get_Value(i); if (xv != "") { ISimpleFillSymbol pNextSymbol = (ISimpleFillSymbol)pUniqueValueRenderer.get_Symbol(xv); pNextSymbol.Color = colorRamp.get_Color(127); pUniqueValueRenderer.set_Symbol(xv, (ISymbol)pNextSymbol); } } pGeoFeatureLayer.Renderer = (IFeatureRenderer)pUniqueValueRenderer; } public void UniqueRenderer(IFeatureLayer featLayer, string fieldName, IColorRamp colorRamp) { IGeoFeatureLayer pGeoFeatureLayer = featLayer as IGeoFeatureLayer; IFeatureClass pFeatureClass = featLayer.FeatureClass; //获取图层上的featureClass IFeatureCursor pFeatureCursor = pFeatureClass.Search(null, false); IUniqueValueRenderer pUniqueValueRenderer = new UniqueValueRendererClass(); //唯一值渲染器 //设置渲染字段对象 pUniqueValueRenderer.FieldCount = 1; pUniqueValueRenderer.set_Field(0, fieldName); ISimpleFillSymbol pSimFillSymbol = new SimpleFillSymbolClass(); //创建填充符号 pUniqueValueRenderer.DefaultSymbol = (ISymbol)pSimFillSymbol; pUniqueValueRenderer.UseDefaultSymbol = false; int n = pFeatureClass.FeatureCount(null); for (int i = 0; i < n; i++) { IFeature pFeature = pFeatureCursor.NextFeature(); IClone pSourceClone = pSimFillSymbol as IClone; ISimpleFillSymbol pSimpleFillSymbol = pSourceClone.Clone() as ISimpleFillSymbol; string pFeatureValue = pFeature.get_Value(pFeature.Fields.FindField(fieldName)).ToString(); pUniqueValueRenderer.AddValue(pFeatureValue, "", (ISymbol)pSimpleFillSymbol); } //为每个符号设置颜色 for (int i = 0; i <= pUniqueValueRenderer.ValueCount - 1; i++) { string xv = pUniqueValueRenderer.get_Value(i); if (xv != "") { ISimpleFillSymbol pNextSymbol = (ISimpleFillSymbol)pUniqueValueRenderer.get_Symbol(xv); //pColor = ramp.get_Color(j * (ramp.Size - 1) / (count - 1)); pNextSymbol.Color = colorRamp.get_Color(i * (colorRamp.Size-1) / (pUniqueValueRenderer.ValueCount-1)); pUniqueValueRenderer.set_Symbol(xv, (ISymbol)pNextSymbol); } } pGeoFeatureLayer.Renderer = (IFeatureRenderer)pUniqueValueRenderer; } public void ClassRenderer(IFeatureLayer featLayer, string fieldName, IColorRamp colorRamp, int count) { //值分级 IBasicHistogram pBasicHis = new BasicTableHistogramClass(); ITableHistogram pTabHis = (ITableHistogram)pBasicHis; //贫困发生率 IClassifyGEN pClassify = new EqualIntervalClass(); pTabHis.Field = fieldName; //IGeoFeatureLayer geolayer = (IGeoFeatureLayer)Layer; ILayer Layer = (ILayer)featLayer; ITable pTab = (ITable)Layer; pTabHis.Table = pTab; object doubleArrVal, longArrFreq; pBasicHis.GetHistogram(out doubleArrVal, out longArrFreq); int nDes = count; pClassify.Classify(doubleArrVal, longArrFreq, ref nDes); object classes = pClassify.ClassBreaks; double[] ClassNum; ClassNum = (double[])pClassify.ClassBreaks; int ClassCountResult = ClassNum.GetUpperBound(0); IClassBreaksRenderer pRender = new ClassBreaksRendererClass(); pRender.BreakCount = ClassCountResult; pRender.Field = fieldName; ISimpleFillSymbol pSym; IColor pColor; for (int j = 0; j < ClassCountResult; j++) { pColor = colorRamp.get_Color(j * (colorRamp.Size-1) / (ClassCountResult-1)); pSym = new SimpleFillSymbolClass(); pSym.Color = pColor; pRender.set_Symbol(j, (ISymbol)pSym); pRender.set_Break(j, ClassNum[j + 1]); pRender.set_Label(j, ClassNum[j].ToString("0.00") + " - " + ClassNum[j + 1].ToString("0.00")); } IGeoFeatureLayer pGeoLyr = (IGeoFeatureLayer)Layer; pGeoLyr.Renderer = (IFeatureRenderer)pRender; } public void ProportionalRenderer(IFeatureLayer featLayer, string fieldName, IColorRamp colorRamp, double count) { IProportionalSymbolRenderer psrender = new ProportionalSymbolRendererClass(); psrender.Field = fieldName; psrender.ValueUnit = esriUnits.esriUnknownUnits; psrender.ValueRepresentation = esriValueRepresentations.esriValueRepUnknown; //选择渲染的样式，与颜色 minsymbol为比填内容，否则没有效果 ISimpleMarkerSymbol markersym = new SimpleMarkerSymbol(); markersym.Size = count; markersym.Style = esriSimpleMarkerStyle.esriSMSCircle; markersym.Color = colorRamp.get_Color(127); psrender.MinSymbol = markersym as ISymbol; //IFeatureLayer featLayer = featLayer; IGeoFeatureLayer geofeat = featLayer as IGeoFeatureLayer; ICursor cursor = ((ITable)featLayer).Search(null, true); IDataStatistics datastat = new DataStatisticsClass(); datastat.Cursor = cursor; datastat.Field = fieldName;//千万不能忽视 IStatisticsResults statisticsResult; try { statisticsResult = datastat.Statistics; psrender.MinDataValue = statisticsResult.Minimum + 0.1; psrender.MaxDataValue = statisticsResult.Maximum; } catch { MessageBox.Show("错误，选择的属性不是数值型！", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Asterisk); } ////设置background的样式 IFillSymbol fillsym = new SimpleFillSymbolClass(); fillsym.Color = getcolor(201, 201, 251); ILineSymbol linesym = new SimpleLineSymbolClass(); linesym.Width = 1; fillsym.Outline = linesym; psrender.BackgroundSymbol = fillsym; psrender.LegendSymbolCount = 6;//legend的数量 psrender.CreateLegendSymbols();//创建TOC的legend geofeat.Renderer = (IFeatureRenderer)psrender; }

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完整源码下载：FeatureAndRasterRenderer.rar