ArcGIS Server 专题图开发（柱状图实现实例）

       最近学习ArcGIS Server开发，学习到ArcGIS Server 专题图开发，对其实现的一般步骤还没有能完全掌握，现以柱状图实现实例代码为例，供研究学习之用。

      //创建柱状专题图

    public void CreateBarRenderer(int layerID, string[] fields)

    {

        // 得到地图服务下的ArcObjects map对象

        ESRI.ArcGIS.Server.IServerContext pServerContext = GetServerContext();

        ESRI.ArcGIS.Carto.IMapServer mapServer = (ESRI.ArcGIS.Carto.IMapServer)pServerContext.ServerObject;

        ESRI.ArcGIS.Carto.IMapServerObjects2 mapServerObjects = (ESRI.ArcGIS.Carto.IMapServerObjects2)mapServer;

        string mapName = mapServer.DefaultMapName;

        ESRI.ArcGIS.Carto.IMap aoMap = mapServerObjects.get_Map(mapName);

        ESRI.ArcGIS.Carto.ILayer pLayer = aoMap.get_Layer(layerID);//得到图层

        ESRI.ArcGIS.Carto.IGeoFeatureLayer pGeoLayer = pLayer as IGeoFeatureLayer;

        //设置专题图元素的属性名称列表           

        IChartRenderer pChartRender = pServerContext.CreateObject("esriCarto.ChartRenderer") as IChartRenderer;

        IRendererFields pRenderFields = pChartRender as IRendererFields;

        foreach (string var in fields)

        {

            pRenderFields.AddField(var, var);

        }

        //实例化图表对象并取得元素指定属性的最大值

        IBarChartSymbol pBarChartSymbol = pServerContext.CreateObject("esriDisplay.BarChartSymbol") as IBarChartSymbol;

        IChartSymbol pChartSymbol = pBarChartSymbol as IChartSymbol;

        pChartSymbol.MaxValue = GetStaMaxMin(fields,pGeoLayer)[0];        

        pBarChartSymbol.Width = 8;

        IMarkerSymbol pMarkerSymbol = pBarChartSymbol as IMarkerSymbol;

        pMarkerSymbol.Size = 50;

        //设置柱状图每列填充效果

        ISymbolArray pSymbolArray = pBarChartSymbol as ISymbolArray;

        Random ranColor = new Random();

        for (int i = 0; i < fields.Length; i++)

        {

            IFillSymbol pFillSymbol = pServerContext.CreateObject("esriDisplay.SimpleFillSymbol") as IFillSymbol;

            pFillSymbol.Color = GetRGB(ranColor.Next(255), ranColor.Next(255), ranColor.Next(255),pServerContext);

            pSymbolArray.AddSymbol((ISymbol)pFillSymbol);

        }

        //设置地图图层背景

        ESRI.ArcGIS.Display.ISimpleFillSymbol pFSymbol = pServerContext.CreateObject("esriDisplay.SimpleFillSymbol") as ESRI.ArcGIS.Display.SimpleFillSymbol;

        pFSymbol.Color = GetRGB(239, 228, 249,pServerContext);

        pChartRender.BaseSymbol = pFSymbol as ISymbol;

        //应用柱状专题到指定图层

        pChartRender.ChartSymbol = pBarChartSymbol as IChartSymbol;

        pChartRender.Label = "Test";

        pChartRender.UseOverposter = false;        

        pChartRender.CreateLegend();

        pGeoLayer.Renderer = pChartRender as IFeatureRenderer;

        //刷新地图显示图表及图例

        mapServerObjects.RefreshServerObjects();

        Map1.RefreshResource("MapResourceItem0");

        Toc1.BuddyControl = "Map1";

        Toc1.Refresh();

        Map1.Refresh();

        pServerContext.ReleaseContext();

    }