[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classCountclassifyGEN.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LegendISimpleFillSymbol 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 = feature.get_Value(fieldIndex).ToString();simpleFillSymbol = new SimpleFillSymbolClass();simpleFillSymbol.Color = enumColors.Next();uniqueValueRenderer.AddValue(nameValue, RenderField, simpleFillSymbol as ISymbol);}}geoFeatureLayer.Renderer = uniqueValueRenderer as IFeatureRenderer;}/// <summary>///  单一值渲染(多字段）/// </summary>/// <param name="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 = feature.get_Value(fieldIndex).ToString();simpleFillSymbol = new SimpleFillSymbolClass();simpleFillSymbol.Color = enumColors.Next();uniqueValueRenderer.AddValue(nameValue, RenderField[i], simpleFillSymbol as ISymbol);}}}geoFeatureLayer.Renderer = uniqueValueRenderer as IFeatureRenderer;}

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。

/// <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legendproportionalSymbolRenderer.MinDataValue = 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。

/// <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 = 0.0, maxValue = 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 = 0.0, maxValue = 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 = 0.0, maxValue = 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。

/// <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 = 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）：

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;}