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