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[转] ArcEngine 产生专题图

小生原文 ArcEngine 产生专题图

ArcEngine提供多个着色对象用于产生专题图,可以使用标准着色方案,也可以自定义着色方案,ArcEngine提供8中标准着色方案。

一、SimpleRenderer专题图

是使用单一符号进行着色分类,不涉及对要素的数据进行处理。这种专题图同一个图层内的所有元素都是一种符号。

通过SimpleRenderer对象对Symbol进行设置后,赋予IGeoFeatureLayer接口的Renderer属性,对象实现了ITransparencyRenerer接口,通过该接口的属性,可以根据要素的某一个数值字段来设置要素显示的透明度。

该对象还实现了ISimpleRenderer接口,提供了两个重要的属性:Description和Label这两个属性用来设置图例。

/// <summary>        /// 简单渲染        /// </summary>        /// <param name="layerName">图层名字</param>        /// <param name="FillStyle">FillStyle</param>        /// <param name="pColor">FillColor</param>        /// <param name="OutLineColor">OutLineColor</param>        /// <param name="RenderLabel">样式名称注释</param>        /// <param name="Descripition">描述</param>        public void createSimpleFillSymbol(string layerName,esriSimpleFillStyle FillStyle,IColor pColor,IColor OutLineColor,string RenderLabel,string Descripition)        {            //简单填充符号            ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass();            //可以用符号选择器进行            simpleFillSymbol.Style = FillStyle;            simpleFillSymbol.Color = pColor;            //创建边线符号            ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbolClass();            simpleLineSymbol.Style = esriSimpleLineStyle.esriSLSSolid;            simpleLineSymbol.Color = OutLineColor;            ISymbol symbol = simpleLineSymbol as ISymbol;            symbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;            simpleFillSymbol.Outline = simpleLineSymbol;            ISimpleRenderer simpleRender = new SimpleRendererClass();            simpleRender.Symbol = simpleFillSymbol as ISymbol;            simpleRender.Label = RenderLabel;            simpleRender.Description = Descripition;            IGeoFeatureLayer geoFeatureLayer;            geoFeatureLayer = getGeoLayer(layerName);            if (geoFeatureLayer != null)            {                geoFeatureLayer.Renderer = simpleRender as IFeatureRenderer;            }        }

 

二、ClassBreakRenderer专题图

为分级专题图,通过要素图层中要素的某个数值字段的值,根据用户要求,将这些值分为多个级别,每个级别用不同的Symbol显示。

该对象实现了IClassBreakRenderer接口,提供了实现分级显示的属性和方法,如Field属性用于设置分级着色的字段,BreakCount属性用于设置分级的数目。

/// <summary>        /// 分级渲染        /// </summary>        /// <param name="layerName">图层名</param>        /// <param name="classCount">分级数目</param>        /// <param name="ClassField">分级字段</param>        /// <param name="FillStyle">填充样式</param>        public void createClassBreakRender(string layerName, int classCount, string ClassField, esriSimpleFillStyle FillStyle)        {            //int classCount = 6;            ITableHistogram tableHistogram;//表格直方图            IBasicHistogram basicHistogram;//Provides access to members that control histogram objects created from different data sources.             ITable table;            IGeoFeatureLayer geoFeatureLayer;            geoFeatureLayer = getGeoLayer(layerName);            ILayer layer = geoFeatureLayer as ILayer;            table = layer as ITable;            tableHistogram = new BasicTableHistogramClass();            //按照 数值字段分级            tableHistogram.Table = table;            tableHistogram.Field = ClassField;            basicHistogram = tableHistogram as IBasicHistogram;            object values;            object frequencys;            //先统计每个值和各个值出现的次数            basicHistogram.GetHistogram(out values, out frequencys);            //创建平均分级对象            IClassifyGEN classifyGEN = new QuantileClass();            //用统计结果进行分级 ,级别数目为classCount            classifyGEN.Classify(values, frequencys, ref classCount);            //获得分级结果,是个 双精度类型数组             double[] classes;            classes = classifyGEN.ClassBreaks as double[];            //定义不同等级渲染的色带用色            IEnumColors enumColors = CreateAlgorithmicColorRamp(classes.Length).Colors;            IColor color;            IClassBreaksRenderer classBreaksRenderer = new ClassBreaksRendererClass();            classBreaksRenderer.Field = ClassField;            classBreaksRenderer.BreakCount = classCount;//分级数目            classBreaksRenderer.SortClassesAscending = true;//定义分类是否在TOC中显示Legend            ISimpleFillSymbol simpleFillSymbol;            for (int i = 0; i < classes.Length - 1; i++)            {                color = enumColors.Next();                simpleFillSymbol = new SimpleFillSymbolClass();                simpleFillSymbol.Color = color;                simpleFillSymbol.Style = FillStyle;                classBreaksRenderer.set_Symbol(i, simpleFillSymbol as ISymbol);                classBreaksRenderer.set_Break(i, classes[i]);            }            if (geoFeatureLayer != null)            {                geoFeatureLayer.Renderer = classBreaksRenderer as IFeatureRenderer;            }                   }

 

三、UniqueValueRenderer专题图

是依据要素图层中的某个字段的不同值,给每个要素一个单独的颜色,以区分存在的每一个要素。

UniqueValueRenderer实现了IUniqueValueRenderer接口,提供了各种属性和方法,如AddValue方法用于将单个要素的某个字段值和与之相匹配的着色符号加入到UniqueValueRenderer对象。

 

/// <summary>        /// 单一值渲染(单字段)        /// </summary>        /// <param name="layerName">图层名</param>        /// <param name="RenderField">渲染字段</param>        /// <param name="FillStyle">填充样式</param>        /// <param name="valueCount">字段的唯一值个数</param>        public void createUniqueValueRander(string layerName, string RenderField, esriSimpleFillStyle FillStyle,int valueCount)        {            IGeoFeatureLayer geoFeatureLayer;            geoFeatureLayer = getGeoLayer(layerName);            IUniqueValueRenderer uniqueValueRenderer = new UniqueValueRendererClass();            //可以设置多个字段            uniqueValueRenderer.FieldCount = 1;//0-3个            uniqueValueRenderer.set_Field(0, RenderField);            //简单填充符号            ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass();            simpleFillSymbol.Style = FillStyle;            IFeatureCursor featureCursor = geoFeatureLayer.FeatureClass.Search(null, false);            IFeature feature;            if (featureCursor != null)            {                IEnumColors enumColors = CreateAlgorithmicColorRamp(valueCount).Colors;                int fieldIndex = geoFeatureLayer.FeatureClass.Fields.FindField(RenderField);                for (int i = 0; i < valueCount; i++)                {                    feature = featureCursor.NextFeature();                    string nameValue = http://www.mamicode.com/feature.get_Value(fieldIndex).ToString();"layerName">图层名</param>        /// <param name="RenderField">多字段名</param>        /// <param name="FillStyle">样式</param>        /// <param name="valueCount">每个字段中唯一值的个数</param>        public void createUniqueValueRander(string layerName, string[] RenderField, esriSimpleFillStyle FillStyle, int[] valueCount)        {            IGeoFeatureLayer geoFeatureLayer;            geoFeatureLayer = getGeoLayer(layerName);            IUniqueValueRenderer uniqueValueRenderer = new UniqueValueRendererClass();            //可以设置多个字段            uniqueValueRenderer.FieldCount = RenderField .Length;//0-3个            for (int i = 0; i < RenderField.Length; i++)            {                uniqueValueRenderer.set_Field(i, RenderField[i]);            }            //简单填充符号            ISimpleFillSymbol simpleFillSymbol = new SimpleFillSymbolClass();            simpleFillSymbol.Style = FillStyle;            IFeatureCursor featureCursor = geoFeatureLayer.FeatureClass.Search(null, false);            IFeature feature;            if (featureCursor != null)            {                for (int i = 0; i < RenderField.Length; i++)                {                    IEnumColors enumColors = CreateAlgorithmicColorRamp(valueCount[i]).Colors;                    int fieldIndex = geoFeatureLayer.FeatureClass.Fields.FindField(RenderField[i]);                    for (int j = 0; j < valueCount[i]; j++)                    {                        feature = featureCursor.NextFeature();                        string nameValue = http://www.mamicode.com/feature.get_Value(fieldIndex).ToString();>

 

四、ProportionalSymbolRenderer专题图

使用梯度着色法制作的专题图。

ProportionalSymbolRenderer实现了IProportionalSymbolRenderer接口。

这种着色法需要用户知道最大和最小点各自代表的字段值、着色基于的字段和着色点使用的符号以及它在Legend要出现的级别数目。

 

技术分享
/// <summary>        /// 梯度着色        /// </summary>        /// <param name="layerName">图层名字</param>        /// <param name="ProportionField">要参考的字段</param>        /// <param name="FillStyle">填充样式</param>        /// <param name="fillColor">填充Color</param>        /// <param name="characterMarkerSymbol">特征点符号</param>        /// <param name="units">参考单位</param>        /// <param name="pLegendSymbolCount">要分成的级数</param>        public void createProportionSymbolRender(string layerName, string ProportionField, esriSimpleFillStyle FillStyle, IColor fillColor, ICharacterMarkerSymbol characterMarkerSymbol, esriUnits units, int pLegendSymbolCount)        {            IGeoFeatureLayer geoFeatureLayer;            IFeatureLayer featureLayer;            IProportionalSymbolRenderer proportionalSymbolRenderer;            ITable table;            ICursor cursor;            IDataStatistics dataStatistics;//用一个字段生成统计数据            IStatisticsResults statisticsResult;//报告统计数据            //stdole.IFontDisp fontDisp;//定义字体            geoFeatureLayer = getGeoLayer(layerName);            featureLayer = geoFeatureLayer as IFeatureLayer;            table = geoFeatureLayer as ITable;            cursor = table.Search(null, true);            dataStatistics = new DataStatisticsClass();            dataStatistics.Cursor = cursor;            dataStatistics.Field = ProportionField;//确定分级字段            statisticsResult = dataStatistics.Statistics;            if (statisticsResult != null)            {                IFillSymbol fillSymbol = new SimpleFillSymbolClass();                fillSymbol.Color = fillColor;                //ICharacterMarkerSymbol characterMarkerSymbol = new CharacterMarkerSymbolClass();                //fontDisp = new stdole.StdFontClass() as stdole.IFontDisp;                //fontDisp.Name = "arial";                //fontDisp.Size = 20;                //characterMarkerSymbol.Font = fontDisp;                //characterMarkerSymbol.CharacterIndex = 90;                //characterMarkerSymbol.Color = getRGB(255, 0, 0);                //characterMarkerSymbol.Size = 8;                proportionalSymbolRenderer = new ProportionalSymbolRendererClass();                proportionalSymbolRenderer.ValueUnit = units;                proportionalSymbolRenderer.Field = ProportionField ;                proportionalSymbolRenderer.FlanneryCompensation = false;//分级是不是在TOC中显示legend                proportionalSymbolRenderer.MinDataValue =http://www.mamicode.com/ statisticsResult.Minimum;                proportionalSymbolRenderer.MaxDataValue = statisticsResult.Maximum;                proportionalSymbolRenderer.BackgroundSymbol = fillSymbol;                proportionalSymbolRenderer.MinSymbol = characterMarkerSymbol as ISymbol;                proportionalSymbolRenderer.LegendSymbolCount = pLegendSymbolCount;//要分成的级数                proportionalSymbolRenderer.CreateLegendSymbols();                geoFeatureLayer.Renderer = proportionalSymbolRenderer as IFeatureRenderer;            }        }
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五、ChartRenderer专题图

使用一个饼图或柱图来表示一个要素的多个属性。有水平排列和累计排列两种。

ChartRenderer对象实现了IChartRenderer接口,其中ChartSymbol方法用于设置着色对象的着色符号,Label属性用于设置Legend的标签。

该方法用于比较一个要素中不同属性,在获得着色图层的单个或多个字段时用RendererField对象来操作。该类实现了IRendererField接口,可以通过AddField方法来添加字段。

该着色法是使用饼图来表现要素的多个属性之间的比率关系。该对象实现了IPicChartRenderer接口,使用PieChartSymbol符号来修饰要素。

技术分享
/// <summary>        /// 条状图渲染        /// </summary>        /// <param name="layerName">图层名字</param>        /// <param name="RenderField">要柱状表示的字段</param>        /// <param name="fillsymbolColor">这些字段分别需要渲染的颜色</param>        /// <param name="BarWidth">每个柱子的宽度</param>        /// <param name="BgColor">背景色</param>        public void createBarChartSymbol(string layerName, string[] RenderField, IColor[] fillsymbolColor,double BarWidth,IColor BgColor)        {            IGeoFeatureLayer geoFeatureLayer;            IFeatureLayer featureLayer;            ITable table;            ICursor cursor;            IRowBuffer rowBuffer;            //获取渲染图层            geoFeatureLayer = getGeoLayer(layerName);            featureLayer = geoFeatureLayer as IFeatureLayer;            table = featureLayer as ITable;            geoFeatureLayer.ScaleSymbols = true;            IChartRenderer chartRenderer = new ChartRendererClass();            IRendererFields rendererFields = chartRenderer as IRendererFields;            for (int i = 0; i < RenderField.Length; i++)            {                rendererFields.AddField(RenderField[i], RenderField[i]);            }            //int[] fieldIndexs = new int[2];            //fieldIndexs[0] = table.FindField(field1);            //fieldIndexs[1] = table.FindField(field2);            //获取要素最大值,决定柱子的最大高度            double fieldValue = http://www.mamicode.com/0.0, maxValue = http://www.mamicode.com/0.0;            cursor = table.Search(null, true);            rowBuffer = cursor.NextRow();            while (rowBuffer != null)            {                for (int i = 0; i < RenderField.Length; i++)                {                    int index = table.FindField(RenderField[i]);                    fieldValue = double.Parse(rowBuffer.get_Value(index).ToString());                    if (fieldValue > maxValue)                    {                        maxValue = fieldValue;                    }                }                rowBuffer = cursor.NextRow();            }            //创建水平排列符号            IBarChartSymbol barChartSymbol = new BarChartSymbolClass();            barChartSymbol.Width = BarWidth;//柱子的边长            IMarkerSymbol markerSymbol = barChartSymbol as IMarkerSymbol;            markerSymbol.Size = 50;//这个是?            IChartSymbol chartSymbol = barChartSymbol as IChartSymbol;            chartSymbol.MaxValue = maxValue;            //添加渲染符号            ISymbolArray symbolArray = barChartSymbol as ISymbolArray;            IFillSymbol[] fillsymbol = new IFillSymbol[RenderField.Length];            for (int i = 0; i < RenderField.Length; i++)            {                //设置不同颜色的柱子                fillsymbol[i] = new SimpleFillSymbolClass();                fillsymbol[i].Color = fillsymbolColor[i];                symbolArray.AddSymbol(fillsymbol[i] as ISymbol);                //IFillSymbol fillSymbol = new SimpleFillSymbolClass();                //fillSymbol.Color = getRGB(255, 0, 0);//红色柱子                //symbolArray.AddSymbol(fillSymbol as ISymbol);                //fillSymbol = new SimpleFillSymbolClass();                //fillSymbol.Color = getRGB(0, 255, 0);//绿色柱子                //symbolArray.AddSymbol(fillSymbol as ISymbol);            }            //设置柱状图符号            chartRenderer.ChartSymbol = barChartSymbol as IChartSymbol;            //设置底图样式            IFillSymbol pFillSymbol = new SimpleFillSymbolClass();            pFillSymbol.Color = BgColor;            chartRenderer.BaseSymbol = pFillSymbol as ISymbol;            chartRenderer.UseOverposter = false;//假如那个位置放不下柱状图,是否用线段连接指示位置            //创建图例            chartRenderer.CreateLegend();            geoFeatureLayer.Renderer = chartRenderer as IFeatureRenderer;        }        /// <summary>        /// 创建累计柱状图表(stacked)        /// </summary>        /// <param name="layerName">Name</param>        /// <param name="RenderField">Fields</param>        /// <param name="fillsymbolColor">every Color</param>        /// <param name="BarWidth">width</param>        /// <param name="BgColor">BackGound Color</param>        public void createStackedChartSymbol(string layerName, string[] RenderField, IColor[] fillsymbolColor, double BarWidth, IColor BgColor)        {            IGeoFeatureLayer geoFeatureLayer;            IFeatureLayer featureLayer;            ITable table;            ICursor cursor;            IRowBuffer rowBuffer;            //获取渲染图层            geoFeatureLayer = getGeoLayer(layerName);            featureLayer = geoFeatureLayer as IFeatureLayer;            table = featureLayer as ITable;            geoFeatureLayer.ScaleSymbols = true;            IChartRenderer chartRenderer = new ChartRendererClass();            IRendererFields rendererFields = chartRenderer as IRendererFields;            for (int i = 0; i < RenderField.Length; i++)            {                rendererFields.AddField(RenderField[i], RenderField[i]);            }            //获取要素最大值            double fieldValue = http://www.mamicode.com/0.0, maxValue = http://www.mamicode.com/0.0;            cursor = table.Search(null, true);            rowBuffer = cursor.NextRow();            while (rowBuffer != null)            {                for (int i = 0; i < RenderField.Length ; i++)                {                    int index = table.FindField(RenderField[i]);                    fieldValue = double.Parse(rowBuffer.get_Value(index).ToString());                    if (fieldValue > maxValue)                    {                        maxValue = fieldValue;                    }                }                rowBuffer = cursor.NextRow();            }            //创建累积排列符号            IStackedChartSymbol stackedChartSymbol = new StackedChartSymbolClass();            stackedChartSymbol.Width = 10;//柱子宽度            IMarkerSymbol markerSymbol = stackedChartSymbol as IMarkerSymbol;            markerSymbol.Size = 50;//下面的大小            IChartSymbol chartSymbol = stackedChartSymbol as IChartSymbol;            chartSymbol.MaxValue = maxValue;            //添加渲染符号            ISymbolArray symbolArray = stackedChartSymbol as ISymbolArray;            IFillSymbol[] fillsymbol = new IFillSymbol[RenderField.Length];            for (int i = 0; i < RenderField.Length; i++)            {                //设置不同颜色的柱子                fillsymbol[i] = new SimpleFillSymbolClass();                fillsymbol[i].Color = fillsymbolColor[i];                symbolArray.AddSymbol(fillsymbol[i] as ISymbol);            }            //设置柱状图符号            chartRenderer.ChartSymbol = stackedChartSymbol as IChartSymbol;            IFillSymbol pFillSymbol = new SimpleFillSymbolClass();            pFillSymbol.Color =BgColor;            chartRenderer.BaseSymbol = pFillSymbol as ISymbol;            chartRenderer.UseOverposter = false;            //创建图例            chartRenderer.CreateLegend();            geoFeatureLayer.Renderer = chartRenderer as IFeatureRenderer;        }        /// <summary>        /// 创建饼图        /// </summary>        /// <param name="layerName">name</param>        /// <param name="RenderField">Fields</param>        /// <param name="fillsymbolColor">Each color</param>        /// <param name="BgColor">background Color</param>        public void createPieChartSymbol(string layerName, string[] RenderField, IColor[] fillsymbolColor,  IColor BgColor)        {            IGeoFeatureLayer geoFeatureLayer;            IFeatureLayer featureLayer;            ITable table;            ICursor cursor;            IRowBuffer rowBuffer;                        //获取渲染图层            geoFeatureLayer = getGeoLayer(layerName);            featureLayer = geoFeatureLayer as IFeatureLayer;            table = featureLayer as ITable;            geoFeatureLayer.ScaleSymbols = true;            IChartRenderer chartRenderer = new ChartRendererClass();            IPieChartRenderer pieChartRenderer = chartRenderer as IPieChartRenderer;            IRendererFields rendererFields = chartRenderer as IRendererFields;            for (int i = 0; i < RenderField.Length; i++)            {                rendererFields.AddField(RenderField[i], RenderField[i]);                        }            //获取渲染要素的最大值            double fieldValue = http://www.mamicode.com/0.0, maxValue = http://www.mamicode.com/0.0;            cursor = table.Search(null, true);            rowBuffer = cursor.NextRow();            while (rowBuffer != null)            {                for (int i = 0; i < RenderField.Length ; i++)                {                    int index = table.FindField(RenderField[i]);                    fieldValue = double.Parse(rowBuffer.get_Value(index).ToString());                    if (fieldValue > maxValue)                    {                        maxValue = fieldValue;                    }                }                rowBuffer = cursor.NextRow();            }            //设置饼图符号            IPieChartSymbol pieChartSymbol = new PieChartSymbolClass();            pieChartSymbol.Clockwise = true;            pieChartSymbol.UseOutline = true;            IChartSymbol chartSymbol = pieChartSymbol as IChartSymbol;            chartSymbol.MaxValue = maxValue;            ILineSymbol lineSymbol = new SimpleLineSymbolClass();            lineSymbol.Color = getRGB(255, 0, 0);            lineSymbol.Width = 2;            pieChartSymbol.Outline = lineSymbol;            IMarkerSymbol markerSymbol = pieChartSymbol as IMarkerSymbol;            markerSymbol.Size = 30;            //添加渲染符号            ISymbolArray symbolArray = pieChartSymbol as ISymbolArray;            IFillSymbol[] fillsymbol =new  IFillSymbol[RenderField.Length];            for (int i = 0; i < RenderField.Length; i++)            {                fillsymbol[i] = new SimpleFillSymbolClass();                fillsymbol[i].Color = fillsymbolColor[i];                symbolArray.AddSymbol(fillsymbol[i] as ISymbol);            }            //设置背景            chartRenderer.ChartSymbol = pieChartSymbol as IChartSymbol;            IFillSymbol pFillSymbol = new SimpleFillSymbolClass();            pFillSymbol.Color = BgColor;            chartRenderer.BaseSymbol = pFillSymbol as ISymbol;            chartRenderer.UseOverposter = false;            //创建图例            chartRenderer.CreateLegend();            geoFeatureLayer.Renderer = chartRenderer as IFeatureRenderer;        }
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六、DotDensityRenderer专题图

DotDensityRenderer对象使用DotDensityFillSymbol符号对Polygon类型的要素进行着色。该专题图使用随机分布的点的密度来表现要素某个属性值得大小。也可以对图层的多个属性值着色,通过指定不同的点符号来区分。

DotDensityRenderer对象实现IDotDensityRenderer接口,定义了使用点密度着色方法和属性,如DotDensitySymbol用于确定着色点符号,CreateLegend方法用于产生图例。

技术分享
/// <summary>        /// 点密度        /// </summary>        /// <param name="layerName">图层名字</param>        /// <param name="RenderField">渲染字段</param>        /// <param name="dotDensityFillSymbol">点密度符号</param>        /// <param name="simpleMarkerSymbol">点符号</param>        /// <param name="RenderDensity">点密度</param>        public void createDotDensityFillSymbol(string layerName, string RenderField, IDotDensityFillSymbol dotDensityFillSymbol, ISimpleMarkerSymbol simpleMarkerSymbol,double  RenderDensity)        {            IGeoFeatureLayer geoFeatureLayer;            IDotDensityRenderer dotDensityRenderer;            //获取渲染图层            geoFeatureLayer = getGeoLayer(layerName);            dotDensityRenderer = new DotDensityRendererClass();            IRendererFields rendererFields = dotDensityRenderer as IRendererFields;            //设置渲染字段            rendererFields.AddField(RenderField, RenderField);            ////设置填充颜色和背景色,直接由参数传入,具体定义参考下面的 例子            //dotDensityFillSymbol = new DotDensityFillSymbolClass();            //dotDensityFillSymbol.DotSize = 3;            //dotDensityFillSymbol.Color = getRGB(255, 0, 0);            //dotDensityFillSymbol.BackgroundColor = getRGB(0, 255, 0);            //设置渲染符号            ISymbolArray symbolArray = dotDensityFillSymbol as ISymbolArray;            //点符号样式,也可以参考下面的自己定义            //ISimpleMarkerSymbol simpleMarkerSymbol = new SimpleMarkerSymbolClass();            //simpleMarkerSymbol.Style = esriSimpleMarkerStyle.esriSMSCircle;            //simpleMarkerSymbol.Size = 2;            //simpleMarkerSymbol.Color = getRGB(0, 0, 255);            symbolArray.AddSymbol(simpleMarkerSymbol as ISymbol);            dotDensityRenderer.DotDensitySymbol = dotDensityFillSymbol;            //设置渲染密度            dotDensityRenderer.DotValue =http://www.mamicode.com/ RenderDensity;            //创建图例            dotDensityRenderer.CreateLegend();            geoFeatureLayer.Renderer = dotDensityRenderer as IFeatureRenderer;        }
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此外还有两个补充方法(在调用这些方法的时候能用到):

技术分享
private IMap pMap;        public Renderer(IMap _pMap)        {            pMap = _pMap;        }        //获取颜色对象        private IRgbColor getRGB(int r, int g, int b)        {            IRgbColor pColor;            pColor = new RgbColorClass();            pColor.Red = r;            pColor.Green = g;            pColor.Blue = b;            return pColor;        }        private IGeoFeatureLayer getGeoLayer(string layerName)        {            ILayer layer;            IGeoFeatureLayer geoFeatureLayer;            for (int i = 0; i < this.pMap.LayerCount; i++)            {                layer = this.pMap.get_Layer(i);                if (layer != null && layer.Name == layerName)                {                    geoFeatureLayer = layer as IGeoFeatureLayer;                    return geoFeatureLayer;                }            }            return null;        }
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[转] ArcEngine 产生专题图