ArcGIS Server 实现ArcMap的Graduated symbols功能 (分级渲染)

 

///

    /// 不同颜色生成分级点符号图
    ///

    /// 输入图层
    /// 点符号颜色字段
    /// 点符号分级数
    /// 点符号图层
    public IFeatureLayer GisChart_ClassBreakColorMaker(IFeatureLayer mFeatureLayer, IServerContext pSOC, string mFieldName, ref int iBreakCount)
    {
        IGeoFeatureLayer pGeoFeatureLayer;
        IFillSymbol pFillSymbol;
        ISimpleMarkerSymbol pSimpleMarkerS;
        stdole.StdFont pFontDisp;
        ITable pTable;
        IQueryFilter pQueryFilter;
        ICursor pCursor;
        IDataStatistics pDataStatistics;
        IStatisticsResults pStatisticsResult; 
        pGeoFeatureLayer = mFeatureLayer as IGeoFeatureLayer;
        //计算要素最大最小值
        pTable = (ITable)pGeoFeatureLayer;
        pQueryFilter = new QueryFilterClass();
        pQueryFilter.AddField("");
        pCursor = pTable.Search(pQueryFilter, true);
        pDataStatistics = new DataStatisticsClass();
        pDataStatistics.Cursor = pCursor;
        pDataStatistics.Field = mFieldName;
        pStatisticsResult = pDataStatistics.Statistics;

        //背景色
        pFillSymbol = pSOC.CreateObject("esriDisplay.SimpleFillSymbol") as ISimpleFillSymbol;
        pFillSymbol.Color = GetColor(233, 255, 190,pSOC);

        //点符号样式
        pSimpleMarkerS = pSOC.CreateObject("esriDisplay.SimpleMarkerSymbol") as ISimpleMarkerSymbol;
        pFontDisp = new stdole.StdFontClass();
        pFontDisp.Name = "ESRI Business";
        pFontDisp.Size = 10;
        pSimpleMarkerS.Outline = true;
        pSimpleMarkerS.OutlineColor = GetColor(0, 0, 0, pSOC);

        //分级符号图

        //获取统计数据及起频率
        ITableHistogram pTableHistogram = pSOC.CreateObject("esriCarto.BasicTableHistogram") as ITableHistogram;
        pTableHistogram.Field = mFieldName;
        pTableHistogram.Table = pTable;

        object dataValues, dataFrequency;
        IBasicHistogram pHistogram = (IBasicHistogram)pTableHistogram;
        pHistogram.GetHistogram(out dataValues, out dataFrequency);

        IClassifyGEN pClassify = new NaturalBreaksClass();
        //产生种类
        pClassify.Classify(dataValues, dataFrequency, ref iBreakCount);
        object ob = pClassify.ClassBreaks;
        double[] Classes = (double[])ob;
        int ClassesCount = Classes.Length;

        //定义分类渲染
        IClassBreaksRenderer pClassBreaksRenderer = (IClassBreaksRenderer)pSOC.CreateObject("esriCarto.ClassBreaksRenderer");
        pClassBreaksRenderer.Field = mFieldName;
        pClassBreaksRenderer.BreakCount = ClassesCount;
        pClassBreaksRenderer.SortClassesAscending = true;
        pClassBreaksRenderer.MinimumBreak = Classes[0];
 
        IColor pColor = GetRGBColor(124, 143, 0, pSOC);

        //设置要素的填充颜色
        for (int i = 0; i < ClassesCount; i++)
        {
            ISimpleFillSymbol pFillSymbol1 = new SimpleFillSymbolClass();
            pSimpleMarkerS.Color = pColor;
            pFillSymbol1.Style = esriSimpleFillStyle.esriSFSSolid;
            pSimpleMarkerS.Size = 4*(i+1);
            pClassBreaksRenderer.BackgroundSymbol = pFillSymbol;
            pClassBreaksRenderer.set_Symbol(i, (ISymbol)pSimpleMarkerS);
            pClassBreaksRenderer.set_Break(i, Classes[i]);
        }
        pGeoFeatureLayer.Renderer = (IFeatureRenderer)pClassBreaksRenderer;
        return (IFeatureLayer)pGeoFeatureLayer;
    }
      

    private static IRgbColor GetRGBColor(int yourRed, int yourGreen, int yourBlue, IServerContext pSOC)
    {
        IRgbColor pRGB = (IRgbColor)pSOC.CreateObject("esriDisplay.RgbColor");
        pRGB.Red = yourRed;
        pRGB.Green = yourGreen;
        pRGB.Blue = yourBlue;
        pRGB.UseWindowsDithering = true;
        return pRGB;
    }
    ///

    /// 颜色设置
    ///

    /// R
    /// G
    /// B
    /// GIS颜色对象
    private static IColor GetColor(int red, int green, int blue, IServerContext pSOC)
    {
        IRgbColor rgbColor = GetRGBColor(red, green, blue, pSOC);
        IColor color = rgbColor as IColor;
        return color;
    }