ARCEngine中的简单着色，分级着色，唯一值着色

缺乏、安全感 2021-09-17 08:22 636阅读 0赞

**目录**

简单着色：

分级着色：（导入命名空间：ESRI.ArcGIS.Geodatabase;）

唯一值着色：

--------------------

# 简单着色： #

IMap pMap = axMapControl1.Map;
                    //这里为面状图层为例
                    IGeoFeatureLayer pGeoFeatureLayer = pMap.get_Layer(1) as IGeoFeatureLayer;
                    //新建一个填充符号
                    IFillSymbol pSimpleFills;
                    pSimpleFills = new SimpleFillSymbolClass();
                    IRgbColor color = new RgbColorClass();
                    color.Red = 120;
                    color.Green = 110;
                    color.Blue = 0;
                    pSimpleFills.Color = color;
                    //新建线符号
                    ILineSymbol pLineSymbol = new SimpleLineSymbolClass();
                    color.Red = 255;
                    color.Green = 0;
                    color.Blue = 0;
                    pLineSymbol.Color = color;
                    pLineSymbol.Width = 3;
                    //线符号作为该填充符号的外边缘
                    pSimpleFills.Outline = pLineSymbol;
                    ISimpleRenderer pSimpleRenderer;
                    pSimpleRenderer = new SimpleRendererClass();
                    pSimpleRenderer.Symbol = (ISymbol)pSimpleFills;
    
                    //以POP1990字段作为要素透明设置的属性
                    ITransparencyRenderer pTransRenderer;
                    pTransRenderer = pSimpleRenderer as ITransparencyRenderer;
                    pTransRenderer.TransparencyField = "HousePrice";
                    pGeoFeatureLayer.Renderer = pTransRenderer as IFeatureRenderer;
                    axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);

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# 分级着色：（导入命名空间：ESRI.ArcGIS.Geodatabase;） #

IGeoFeatureLayer pGeoFeatureL;
                ITable pTable;
                IClassifyGEN pClassify;
                ITableHistogram pTableHistogram;
                IBasicHistogram pHistogram;
                object dataFrequency;
    
                object dataValues;
                double[] Classes;
                int ClassesCount;
                IClassBreaksRenderer pClassBreaksRenderer;
                IHsvColor pFromColor;
                IHsvColor pToColor;
                IAlgorithmicColorRamp pAlgorithmicCR;
                IEnumColors pEnumColors;
                bool ok;
                IColor pColor;
                ISimpleFillSymbol pSimpleFillS;
                int lbreakIndex;
                string strPopField = "PersonNum";
                int numDesiredClasses = 5;
    
                IMap pMap = axMapControl1.Map;
                pMap.ReferenceScale = 0;
                pGeoFeatureL = (IGeoFeatureLayer)pMap.get_Layer(1);
                //从pTable的POP1990字段中得到信息给dataValues和 dataFrequency两个数组
                pTable = (ITable)pGeoFeatureL.FeatureClass;
                pTableHistogram = new BasicTableHistogramClass();
                pHistogram = (IBasicHistogram)pTableHistogram;
                pTableHistogram.Field = strPopField;
                pTableHistogram.Table = pTable;
                pHistogram.GetHistogram(out dataValues, out dataFrequency);
                //下面是分级方法，用于根据获取的值计算出符合要求的数据
                pClassify = new EqualIntervalClass();
                try
                {
                    pClassify.Classify(dataValues, dataFrequency, ref numDesiredClasses);
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
    
                //返回一个数组
                Classes = (double[])pClassify.ClassBreaks;
                ClassesCount = Classes.GetUpperBound(0);
                pClassBreaksRenderer = new ClassBreaksRendererClass();
                pClassBreaksRenderer.Field = strPopField;
                //设置着色对象的分级数目
                pClassBreaksRenderer.BreakCount = ClassesCount;
                pClassBreaksRenderer.SortClassesAscending = true;
                //产生分级着色需要的颜色带对象的起止颜色对象
                pFromColor = new HsvColorClass();
                pFromColor.Hue = 60;
                pFromColor.Saturation = 100;
                pFromColor.Value = 96;
                pToColor = new HsvColorClass();
                pToColor.Hue = 0;
                pToColor.Saturation = 100;
                pToColor.Value = 96;
                //产生颜色带对象
                pAlgorithmicCR = new AlgorithmicColorRampClass();
                pAlgorithmicCR.Algorithm = esriColorRampAlgorithm.esriHSVAlgorithm;
                pAlgorithmicCR.FromColor = pFromColor;
                pAlgorithmicCR.ToColor = pToColor;
                pAlgorithmicCR.Size = ClassesCount;
                pAlgorithmicCR.CreateRamp(out ok);
                //获得颜色
                pEnumColors = pAlgorithmicCR.Colors;
                //分类着色对象中的symbol和break的下标是从0开始
                for (lbreakIndex = 0; lbreakIndex <= ClassesCount - 1; lbreakIndex++)
                {
                    pColor = pEnumColors.Next();
                    pSimpleFillS = new SimpleFillSymbolClass();
                    pSimpleFillS.Color = pColor;
                    pSimpleFillS.Style = esriSimpleFillStyle.esriSFSSolid;
                    //这里是构造不同颜色着色的方法
                    pClassBreaksRenderer.set_Symbol(lbreakIndex, (ISymbol)pSimpleFillS);
                    //着色对象的断点
                    pClassBreaksRenderer.set_Break(lbreakIndex, Classes[lbreakIndex + 1]);
                }
                pGeoFeatureL.Renderer = (IFeatureRenderer)pClassBreaksRenderer;
                axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMzIzMjU2_size_16_color_FFFFFF_t_70 1][]

# 唯一值着色： #

IGeoFeatureLayer m_pGeoFeatureL;
                IUniqueValueRenderer pUniqueValueR;
                IFillSymbol pFillSymbol;
                IColor pNextUniqueColor;
                IEnumColors pEnumRamp;
                ITable pTable;
                int lfieldNumber;
                IRow pNextRow;
                IRowBuffer pNextRowBuffer;
                ICursor pCursor;
                IQueryFilter pQueryFilter;
                string codeValue;
                IRandomColorRamp pColorRamp;
                string strNameField = "NAME99";
    
                IMap pMap = axMapControl1.Map;
                pMap.ReferenceScale = 0;
                m_pGeoFeatureL = (IGeoFeatureLayer)pMap.get_Layer(1);
                pUniqueValueR = new UniqueValueRendererClass();
                pTable = (ITable)m_pGeoFeatureL;
    
                lfieldNumber = pTable.FindField(strNameField);
                if (lfieldNumber == -1)
                {
                    MessageBox.Show("未能找到字段 " + strNameField);
                    return;
                }
                //只用一个字段进行单值着色
                pUniqueValueR.FieldCount = 1;
                //用于区分着色的字段
                pUniqueValueR.set_Field(0, strNameField);
                //产生一个随机的颜色条，用的是HSV颜色模式
                pColorRamp = new RandomColorRampClass();
                pColorRamp.StartHue = 0;
                pColorRamp.MinValue = 99;
                pColorRamp.MinSaturation = 15;
                pColorRamp.EndHue = 360;
                pColorRamp.MaxValue = 100;
                pColorRamp.MaxSaturation = 30;
                //任意产生100个颜色，如果知道要素的数目可以产生精确的颜色个数
                pColorRamp.Size = 100;
                bool ok = true;
                pColorRamp.CreateRamp(out ok);
                pEnumRamp = pColorRamp.Colors;
                pNextUniqueColor = null;
                //产生查询过滤器对象
                pQueryFilter = new QueryFilterClass();
                pQueryFilter.AddField(strNameField);
                //根据某个字段在表中找出指向所有行的游标对象
                pCursor = pTable.Search(pQueryFilter, true);
                pNextRow = pCursor.NextRow();
                //遍历所有的要素
                while (pNextRow != null)
                {
                    pNextRowBuffer = pNextRow;
                    //找出Row为“STATES_NAME”的值，即不同的州名
                    codeValue = (string)pNextRowBuffer.get_Value(lfieldNumber);
                    //获取随机颜色带中的任意一个颜色
                    pNextUniqueColor = pEnumRamp.Next();
                    if (pNextUniqueColor == null)
                    {
                        pEnumRamp.Reset();
                        pNextUniqueColor = pEnumRamp.Next();
                    }
                    pFillSymbol = new SimpleFillSymbolClass();
                    pFillSymbol.Color = pNextUniqueColor;
                    //将每次都得的要素字段值和修饰它的符号值放入着色对象中
                    pUniqueValueR.AddValue(codeValue, strNameField, (ISymbol)
                   pFillSymbol);
                    pNextRow = pCursor.NextRow();
                }
                m_pGeoFeatureL.Renderer = (IFeatureRenderer)pUniqueValueR;
                axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, null, null);

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