ArcEngine设置有牵引线的标注

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在ArcGIs中很容易就能设置带有牵引线的标注。

在ArcEngine中实现方法也很简单。如下：

        /// <summary>        /// 设置有引线的标注        /// </summary>        /// <param name="IN_FeatureLayer">要标注的图层</param>        /// <param name="IN_Axmapcontrol">显示控件</param>        private void PRV_SetLabelWithCallout(IFeatureLayer IN_FeatureLayer,AxMapControl IN_Axmapcontrol)        {            //设定地图标注引擎            IAnnotateMap Temp_AnnotateMap = new AnnotateMapClass();            IN_Axmapcontrol.Map.AnnotationEngine = Temp_AnnotateMap;            //标注集合            IGeoFeatureLayer Temp_AnnotationLayer = IN_FeatureLayer as IGeoFeatureLayer;            IAnnotateLayerPropertiesCollection Temp_AllAnnoProps;            Temp_AllAnnoProps = Temp_AnnotationLayer.AnnotationProperties;            Temp_AllAnnoProps.Clear();//清理已有标注属性            IAnnotateLayerProperties Temp_Anno = PRV_SetPropertiesWithCallout(IN_FeatureLayer, "[OBJECTID]", IN_Axmapcontrol);            Temp_AllAnnoProps.Add(Temp_Anno);            IN_Axmapcontrol.AddLayer(IN_FeatureLayer as ILayer);        }

用到的函数：

        /// <summary>        /// 设有引线的标注参数        /// </summary>        /// <param name="IN_FeatureLayer">要标注的图层</param>        /// <param name="IN_ClassExpression">标注表达式</param>        /// <param name="IN_Axmapcontrol">显示控件</param>        /// <returns>标注参数</returns>        private IAnnotateLayerProperties PRV_SetPropertiesWithCallout(IFeatureLayer IN_FeatureLayer, string IN_ClassExpression,AxMapControl IN_Axmapcontrol)        {            //标注引擎            ILabelEngineLayerProperties2 Temp_LabelEngine2 = new LabelEngineLayerPropertiesClass();            IBasicOverposterLayerProperties4 Temp_BasicOverPoster = new BasicOverposterLayerPropertiesClass();            //表达式            Temp_LabelEngine2.Expression = IN_ClassExpression;            //引线            ILineCallout Temp_Callout = new LineCalloutClass();            //引线样式            Temp_Callout.Style = esriLineCalloutStyle.esriLCSMidpoint;            Temp_Callout.LeaderTolerance = 1;            //将外框都设为null，这样就只有引线了            Temp_Callout.Border = null;            Temp_Callout.AccentBar = null;            Temp_Callout.Gap = 10;            //引线类型，这里为点状线            ISimpleLineSymbol Temp_LineSymbol = new SimpleLineSymbolClass();            Temp_LineSymbol.Style = esriSimpleLineStyle.esriSLSDot;            Temp_Callout.LeaderLine = Temp_LineSymbol;            //文字符号设定            IFormattedTextSymbol Temp_TextSymbol = new TextSymbolClass();            //文字颜色            IRgbColor Temp_RGB = new RgbColorClass();            Temp_RGB.Red = 0;            Temp_RGB.Green = 0;            Temp_RGB.Blue = 0;            //文字字体与字号            Temp_TextSymbol = new TextSymbolClass();            Temp_TextSymbol.Color = (IColor)Temp_RGB;            Temp_TextSymbol.Size = 18;            //需要引用stdole.dll            stdole.IFontDisp Temp_Font = new stdole.StdFontClass() as stdole.IFontDisp;            Temp_Font.Name = "Arial";            Temp_TextSymbol.Background = Temp_Callout as ITextBackground;            Temp_TextSymbol.Font = Temp_Font;            Temp_LabelEngine2.Symbol = Temp_TextSymbol as ITextSymbol;            //标注放置方式            switch (IN_FeatureLayer.FeatureClass.ShapeType)//判断图层类型            {                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolygon:                    Temp_BasicOverPoster.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolygon;                    Temp_BasicOverPoster.PolygonPlacementMethod = esriOverposterPolygonPlacementMethod.esriAlwaysHorizontal;                    break;                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint:                    Temp_BasicOverPoster.FeatureType = esriBasicOverposterFeatureType.esriOverposterPoint;                    Temp_BasicOverPoster.PointPlacementMethod = esriOverposterPointPlacementMethod.esriAroundPoint;                    break;                case ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPolyline:                    Temp_BasicOverPoster.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolyline;                    break;            }            Temp_LabelEngine2.BasicOverposterLayerProperties = Temp_BasicOverPoster as IBasicOverposterLayerProperties;            //设定标注            IMapOverposter Temp_MapPos = IN_Axmapcontrol.Map as IMapOverposter;            IOverposterProperties Temp_OverPoster = Temp_MapPos.OverposterProperties;            IAnnotateLayerProperties Temp_AnnoPClass = Temp_LabelEngine2 as IAnnotateLayerProperties;            (IN_FeatureLayer as IGeoFeatureLayer).DisplayAnnotation = true;            return Temp_AnnoPClass;        }

效果如图：

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