ArcEngine标注显示比率

Public void showAnnotationByScale(IFeatureLayer pFeaturelayer)
{
           
            IGeoFeatureLayer pGeoFeatureLayer=pFeaturelayer as IGeoFeatureLayer ;
            //创建标注集接口，可以对标注进行添加、删除、查询、排序等操作
            IAnnotateLayerPropertiesCollection pAnnotateLayerPropertiesCollection = new AnnotateLayerPropertiesCollectionClass();
            pAnnotateLayerPropertiesCollection = pGeoFeatureLayer.AnnotationProperties;
            pAnnotateLayerPropertiesCollection.Clear();
            //创建标注的颜色
            IRgbColor pRgbColor = new RgbColorClass();
            pRgbColor.Red = 255;
            pRgbColor.Green=0;
            pRgbColor.Blue = 0;
            //创建标注的字体样式
            ITextSymbol pTextSymbol = new TextSymbolClass();
            pTextSymbol.Color = pRgbColor;
            pTextSymbol.Size = 12;
            pTextSymbol.Font.Name = "宋体";
            //定义 ILineLabelPosition接口，用来管理line features的标注属性，指定标注和线要素的位置关系
            ILineLabelPosition pLineLabelPosition = new LineLabelPositionClass();
            pLineLabelPosition.Parallel = false;
            pLineLabelPosition.Perpendicular = true;
            pLineLabelPosition.InLine = true;
            //定义 ILineLabelPlacementPriorities接口用来控制标注冲突
            ILineLabelPlacementPriorities pLineLabelPlacementPriorities = new LineLabelPlacementPrioritiesClass();
            pLineLabelPlacementPriorities.AboveStart = 5;
            pLineLabelPlacementPriorities.BelowAfter = 4;
            //定义 IBasicOverposterLayerProperties 接口实现 LineLabelPosition 和 LineLabelPlacementPriorities对象的控制
            IBasicOverposterLayerProperties pBasicOverposterLayerProperties = new BasicOverposterLayerPropertiesClass();
            pBasicOverposterLayerProperties.LineLabelPlacementPriorities = pLineLabelPlacementPriorities;
            pBasicOverposterLayerProperties.LineLabelPosition = pLineLabelPosition;
            pBasicOverposterLayerProperties.FeatureType = esriBasicOverposterFeatureType.esriOverposterPolygon;
            //创建标注对象
            ILabelEngineLayerProperties pLabelEngineLayerProperties = new LabelEngineLayerPropertiesClass();
            //设置标注符号
            pLabelEngineLayerProperties.Symbol = pTextSymbol;
            pLabelEngineLayerProperties.BasicOverposterLayerProperties = pBasicOverposterLayerProperties;
            //声明标注的Expression是否为Simple
            pLabelEngineLayerProperties.IsExpressionSimple = true;
            //设置标注字段
            pLabelEngineLayerProperties.Expression = "[DIQU]";
            //定义IAnnotateLayerTransformationProperties 接口用来控制feature layer的display of dynamic labels
            IAnnotateLayerTransformationProperties pAnnotateLayerTransformationProperties = pLabelEngineLayerProperties as IAnnotateLayerTransformationProperties ;
            //设置标注参考比例尺
            pAnnotateLayerTransformationProperties.ReferenceScale = 500000;
            //定义IAnnotateLayerProperties接口，决定FeatureLayer动态标注信息
            IAnnotateLayerProperties pAnnotateLayerProperties = pLabelEngineLayerProperties as IAnnotateLayerProperties ;
            //设置显示标注最大比例尺
            pAnnotateLayerProperties.AnnotationMaximumScale = 500000;
            //设置显示标注的最小比例
            pAnnotateLayerProperties.AnnotationMinimumScale = 25000000;
            //决定要标注的要素
            pAnnotateLayerProperties.WhereClause = "DIQU<>'宿州市'";
            //将创建好的标注对象添加到标注集对象中
            pAnnotateLayerPropertiesCollection.Add(pAnnotateLayerProperties);
            //声明标注是否显示
            pGeoFeatureLayer.DisplayAnnotation = true;
            //刷新视图
            this.axMapControl1.Refresh();
}

转载自：https://blog.csdn.net/wujianyouhun/article/details/52942466