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：
按 Ctrl+C 复制代码

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;

        }

按 Ctrl+C 复制代码
完整源码下载：FeatureAndRasterRenderer.rar
巴特西

ArcEngine栅格和矢量渲染（含可视化颜色带）

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