• ArcGIS中对一组查询结果同时闪烁的实现


     

    单个要素闪烁很简单,关于多要素同时闪烁主要参考这两篇资源
    Arcgis 要素闪烁
    http://blog.csdn.net/chyocean/archive/2008/04/28/2337418.aspx
    /// <summary>
            /// Defining a renderer for your layer
            /// </summary>
            /// <param name="pGeoFeatureLayer">图层</param>
            /// <param name="fieldName">sde数据库中字段名</param>
            /// <param name="pQueryFilter">过滤条件</param>
            private void DefineUniqueValueRenderer(IGeoFeatureLayer pGeoFeatureLayer, string fieldName, IQueryFilter pQueryFilter)
            {
                // IRandomColorRamp 对象
                IRandomColorRamp pRandomColorRamp = new RandomColorRampClass();
                //Make the color ramp for the symbols in the renderer.
                pRandomColorRamp.MinSaturation = 20;
                pRandomColorRamp.MaxSaturation = 40;
                pRandomColorRamp.MinValue = 85;
                pRandomColorRamp.MaxValue = 100;
                pRandomColorRamp.StartHue = 76;
                pRandomColorRamp.EndHue = 188;
                pRandomColorRamp.UseSeed = true;
                pRandomColorRamp.Seed = 43;
    
                //Make the renderer.
                IUniqueValueRenderer pUniqueValueRenderer = new UniqueValueRendererClass();
    
                //填充样式
                ISimpleFillSymbol pSimpleFillSymbol = new SimpleFillSymbolClass();
                pSimpleFillSymbol.Style = esriSimpleFillStyle.esriSFSSolid;
                pSimpleFillSymbol.Outline.Width = 0.4;
    
                //These properties should be set prior to adding values.
                pUniqueValueRenderer.FieldCount = 1;
                pUniqueValueRenderer.set_Field(0, fieldName);
                pUniqueValueRenderer.DefaultSymbol = pSimpleFillSymbol as ISymbol;
                pUniqueValueRenderer.UseDefaultSymbol = true;
    
                //显示表
                IDisplayTable pDisplayTable = pGeoFeatureLayer as IDisplayTable;
                //IFeatureCursor 对象
                IFeatureCursor pFeatureCursor = pDisplayTable.SearchDisplayTable(pQueryFilter, false) as IFeatureCursor;
                //IFeature对象
                IFeature pFeature = pFeatureCursor.NextFeature();
    
                //bool对象,pUniqueValueRenderer中是否找到字段值
                bool ValFound;
                //字段索引号
                int fieldIndex;
                //IFields对象
                IFields pFields = pFeatureCursor.Fields;
                fieldIndex = pFields.FindField(fieldName);
                while (pFeature != null)//要素存在
                {
                    //填充样式
                    ISimpleFillSymbol pClassSymbol = new SimpleFillSymbolClass();
                    pClassSymbol.Style = esriSimpleFillStyle.esriSFSSolid;
                    pClassSymbol.Outline.Width = 0.4;
    
                    //字段值
                    string classValue;
                    classValue = pFeature.get_Value(fieldIndex) as string;
    
                    //Test to see if this value was added
                    //to the renderer. If not, add it.
                    ValFound = false;
                    for (int i = 0; i <= pUniqueValueRenderer.ValueCount - 1; i++)
                    {
                        if (pUniqueValueRenderer.get_Value(i) == classValue)
                        {
                            ValFound = true;
                            break; //Exit the loop if the value was found.
                        }
                    }
                    //If the value was not found, it is new and it will be added.
                    if (ValFound == false)
                    {
                        pUniqueValueRenderer.AddValue(classValue, fieldName, pClassSymbol as ISymbol);
                        pUniqueValueRenderer.set_Label(classValue, classValue);
                        pUniqueValueRenderer.set_Symbol(classValue, pClassSymbol as ISymbol);
                    }
                    pFeature = pFeatureCursor.NextFeature();
                }
                //Since the number of unique values is known,
                //the color ramp can be sized and the colors assigned.
                pRandomColorRamp.Size = pUniqueValueRenderer.ValueCount;
                //ok
                bool bOK;
                pRandomColorRamp.CreateRamp(out bOK);
                //IEnumColors 对象, 颜色集合
                IEnumColors pEnumColors = pRandomColorRamp.Colors;
                pEnumColors.Reset();
                for (int j = 0; j <= pUniqueValueRenderer.ValueCount - 1; j++)
                {
                    //value值
                    string xv;
                    xv = pUniqueValueRenderer.get_Value(j);
                    if (xv != "")
                    {
                        //填充样式
                        ISimpleFillSymbol pSimpleFillColor = pUniqueValueRenderer.get_Symbol(xv) as ISimpleFillSymbol;
                        pSimpleFillColor.Color = pEnumColors.Next();
                        pUniqueValueRenderer.set_Symbol(xv, pSimpleFillColor as ISymbol);
    
                    }
                }
    
                //'** If you didn't use a predefined color ramp
                //'** in a style, use "Custom" here. Otherwise,
                //'** use the name of the color ramp you selected.
                pUniqueValueRenderer.ColorScheme = "Custom";
                //ITable对象
                ITable pTable = pDisplayTable as ITable;
                //是否string
                bool isString = pTable.Fields.get_Field(fieldIndex).Type == esriFieldType.esriFieldTypeString;
                pUniqueValueRenderer.set_FieldType(0, isString);
                pGeoFeatureLayer.Renderer = pUniqueValueRenderer as IFeatureRenderer;
    
            }
    关于查询后feature闪烁的问题
    http://bbs.esrichina-bj.cn/ESRI/viewthread.php?tid=57376

    [新提问] 关于查询后feature闪烁的问题

    在实现属性到图的查询后,将查询结果闪烁显示,polygon内部并填充,下面贴出代码:
    while (pFeature != null)
                {
                    pMap.SelectFeature(pFeatureLayer, pFeature);
                    pFeature = pFeatureCursor.NextFeature();
                    pActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeoSelection, null, null);
                    pActiveView.ScreenDisplay.UpdateWindow();
                    if (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolyline)
                    {
                        IGeometryCollection pGeometryCollection;
                        pGeometry = pFeature.Shape;
                        pGeometryCollection = new PolylineClass();
                        object Missing1 = Type.Missing;
                        object Missing2 = Type.Missing;
    pGeometryCollection.AddGeometry(pGeometry, ref Missing1, ref Missing2);
                        pCartographicLineSymbol = new CartographicLineSymbol();
                        pSymbol = (ISymbol)pCartographicLineSymbol;
                        pSymbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;
                        pCartographicLineSymbol.Width = Size;
                        pCartographicLineSymbol.Color = pColor;
                        pMapControl.FlashShape((IGeometry)pGeometryCollection, 2, 150, pSymbol);
                    }
                    else if (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolygon)
                    {
                        pGeometry = pFeature.Shape;
                        IGeometryCollection pGeometryCollection;
                        pGeometryCollection = new PolygonClass();
                        object Missing1 = Type.Missing;
                        object Missing2 = Type.Missing;
    pGeometryCollection.AddGeometry(pGeometry, ref Missing1, ref Missing2);
                        pSimpleFillSymbol = new SimpleFillSymbol();
                        pSymbol = (ISymbol)pSimpleFillSymbol;
                        pSymbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;
                        pSimpleFillSymbol.Color = pColor;
                        pMapControl.FlashShape((IGeometry)pGeometryCollection, 2, 150, pSymbol);
                    }
                    else if (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPoint || pFeature.Shape.GeometryType == esriGeometryType.esriGeometryMultipoint)
                    {
                        pGeometry = pFeature.Shape;
                        IGeometryCollection pGeometryCollection;
                        pGeometryCollection = new MultipointClass();
                        pSimpleMarkersymbol = new SimpleMarkerSymbol();
                        object Missing1 = Type.Missing;
                        object Missing2 = Type.Missing;
    pGeometryCollection.AddGeometry(pGeometry, ref Missing1, ref Missing2);
                        pSymbol = (ISymbol)pSimpleMarkersymbol;
                        pSymbol.ROP2 = esriRasterOpCode.esriROPNotXOrPen;
                        pSimpleMarkersymbol.Color = pColor;
                        pSimpleMarkersymbol.Size = 8;
                        pMapControl.FlashShape((IGeometry)pGeometryCollection, 2, 150, pSymbol);
                    }
    红色代码处出现问题,提示说参数类型错误,各位高手和大侠们帮忙看看应该如何修改?  谢谢!!!!!!

    3# JinDin 不是说对于多要素的闪烁要用到IGeometryCollection的么?

    5#把要素存到IArray里.然后用IHookActions.DoActionOnMultiple 方法试试.

    6#同意LS方法,将波涛的书里也是用该方法,可以闪烁多个要素

    7#这个功能终于搞定了,线和面我的是 pGeometryCollection.AddGeometryCollection((IGeometryCollection)pGeometry);点用的是pGeometryCollection.AddGeometry(pGeometry, ref obj, ref obj),不知道为什么点线面不能用同样的方法添加要素?还有一个问题就是关于一直闪烁,FlashShape()中第二个闪烁次数的参数,似乎不敢设置太大,否则就会一直执行到闪烁完才可以执行后面的代码,是不是用Timer可以解决这个问题呢?试试先

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  • 原文地址:https://www.cnblogs.com/flyingfish/p/1639222.html
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