來自：https://blog.csdn.net/u011609113/article/details/51372827/
在ArcGIs中很容易就能設置帶有牽引線的標注。
在ArcEngine中實現方法也很簡單。如下：
/// <summary>
/// 設置有引線的標注
/// </summary>
/// <param name="IN_FeatureLayer">要標注的圖層</param>
/// <param name="IN_Axmapcontrol">顯示控件</param>
private void PRV_SetLabelWithCallout(IFeatureLayer IN_FeatureLayer,AxMapControl IN_Axmapcontrol)
{
//設定地圖標注引擎
IAnnotateMap Temp_AnnotateMap = new AnnotateMapClass();
IN_Axmapcontrol.Map.AnnotationEngine = Temp_AnnotateMap;
//標注集合
IGeoFeatureLayer Temp_AnnotationLayer = IN_FeatureLayer as IGeoFeatureLayer;
IAnnotateLayerPropertiesCollection Temp_AllAnnoProps;
Temp_AllAnnoProps = Temp_AnnotationLayer.AnnotationProperties;
Temp_AllAnnoProps.Clear();//清理已有標注屬性
IAnnotateLayerProperties Temp_Anno = PRV_SetPropertiesWithCallout(IN_FeatureLayer, "[OBJECTID]", IN_Axmapcontrol);
Temp_AllAnnoProps.Add(Temp_Anno);
IN_Axmapcontrol.AddLayer(IN_FeatureLayer as ILayer);
}
用到的函數：
/// <summary>
/// 設有引線的標注參數
/// </summary>
/// <param name="IN_FeatureLayer">要標注的圖層</param>
/// <param name="IN_ClassExpression">標注表達式</param>
/// <param name="IN_Axmapcontrol">顯示控件</param>
/// <returns>標注參數</returns>
private IAnnotateLayerProperties PRV_SetPropertiesWithCallout(IFeatureLayer IN_FeatureLayer, string IN_ClassExpression,AxMapControl IN_Axmapcontrol)
{
//標注引擎
ILabelEngineLayerProperties2 Temp_LabelEngine2 = new LabelEngineLayerPropertiesClass();
IBasicOverposterLayerProperties4 Temp_BasicOverPoster = new BasicOverposterLayerPropertiesClass();
//表達式
Temp_LabelEngine2.Expression = IN_ClassExpression;
//引線
ILineCallout Temp_Callout = new LineCalloutClass();
//引線樣式
Temp_Callout.Style = esriLineCalloutStyle.esriLCSMidpoint;
Temp_Callout.LeaderTolerance = 1;
//將外框都設為null，這樣就只有引線了
Temp_Callout.Border = null;
Temp_Callout.AccentBar = null;
Temp_Callout.Gap = 10;
//引線類型，這里為點狀線
ISimpleLineSymbol Temp_LineSymbol = new SimpleLineSymbolClass();
Temp_LineSymbol.Style = esriSimpleLineStyle.esriSLSDot;
Temp_Callout.LeaderLine = Temp_LineSymbol;
//文字符號設定
IFormattedTextSymbol Temp_TextSymbol = new TextSymbolClass();
//文字顏色
IRgbColor Temp_RGB = new RgbColorClass();
Temp_RGB.Red = 0;
Temp_RGB.Green = 0;
Temp_RGB.Blue = 0;
//文字字體與字號
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;
//標注放置方式
switch (IN_FeatureLayer.FeatureClass.ShapeType)//判斷圖層類型
{
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;
//設定標注
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;
}
效果如圖：
