ArcGis 创建Annotation注记要素类、添加注记要素 并加载到Activeview AO C#
2021-02-03 03:18
标签：ping layer 保存 placed sig require false exchange phi AO中一般有两种方式存储图面注记元素，一种使用TextElement，它是文档级的元素，编辑后要通过文档（mxd）保存；另一种是使用Annotation要素类，它是一个独立的要素类（featureclass），需要存储到地理数据库中。使用Annotation featureclass 的方式更灵活、更强大，至于如何灵活，如何强大，待你用到便自知。 下面是一个摘自Esri官网的代码段，可以使用它创建StandardAnnotationClass。 上面开始在AnnotationMark类的构造函数中创建了Annotation要素类featureClass，下面是创建Annotation 要素 feature的代码。 博主竟没有在墙内网络上找到相关的实现方案，只得爬墙去攒了这片代码，它主要是使用了ISymbolCollectionElement接口设置了Feature的各种属性。此外，网络上还有使用 Why do these annotations appear stacked/overlapping?（再羡国外论坛生态） 不啰嗦，上代码： ArcGis 创建Annotation注记要素类、添加注记要素 并加载到Activeview AO C# 标签：ping layer 保存 placed sig require false exchange phi 原文地址：https://www.cnblogs.com/yzhyingcool/p/11518652.html1、创建一个标准的Annotation要素类（StandardAnnotationClass）
1 public AnnotationMark(IFeatureClass outPolygonFc,string mdbPath,int referenceScale)
2 {
3 string annotationName = "Annotation";
4 IWorkspaceFactory workspaceFactory = new AccessWorkspaceFactoryClass();
5 IFeatureWorkspace featureWorkspace = workspaceFactory.OpenFromFile(mdbPath, 0) as IFeatureWorkspace;
6 IGeoDataset geoDataset = outPolygonFc as IGeoDataset;
7 ISpatialReference spatialReference = geoDataset.SpatialReference;
8 Utils.UserWorkspace.FeatureWorkspace.TryDeleteFeatureClass(annotationName, featureWorkspace);
9 featureClass = Utils.UserWorkspace.FeatureWorkspace.CreateStandardAnnotationClass(featureWorkspace, null,annotationName, spatialReference, referenceScale, esriUnits.esriMeters, null);
10 }
值得注意的是：
featureDataset根据数据库是否有数据集（dataset）而定，可以是null;
referenceScale是注记的参考比例，注记元素会以此为基准，放大或缩小，一般建议设置为出图比例尺，这样所设置的字号即出图字号。
configKeyword="" 1 public static IFeatureClass CreateStandardAnnotationClass(IFeatureWorkspace featureWorkspace, IFeatureDataset featureDataset, String className,
2 ISpatialReference spatialReference, int referenceScale, esriUnits referenceScaleUnits, String configKeyword)
3 {
4 // Create an annotation class and provide it with a name.
5 ILabelEngineLayerProperties labelEngineLayerProperties = new
6 LabelEngineLayerPropertiesClass();
7 IAnnotateLayerProperties annotateLayerProperties = (IAnnotateLayerProperties)
8 labelEngineLayerProperties;
9 annotateLayerProperties.Class = "Annotation";
10
11 // Get the symbol from the annotation class. Make any changes to its properties
12 // here.
13 ITextSymbol annotationTextSymbol = labelEngineLayerProperties.Symbol;
14 ISymbol annotationSymbol = (ISymbol)annotationTextSymbol;
15
16 // Create a symbol collection and add the default symbol from the
17 // annotation class to the collection. Assign the resulting symbol ID
18 // to the annotation class.
19 ISymbolCollection symbolCollection = new SymbolCollectionClass();
20 ISymbolCollection2 symbolCollection2 = (ISymbolCollection2)symbolCollection;
21 ISymbolIdentifier2 symbolIdentifier2 = null;
22 symbolCollection2.AddSymbol(annotationSymbol, "Annotation", out
23 symbolIdentifier2);
24 labelEngineLayerProperties.SymbolID = symbolIdentifier2.ID;
25
26 // Add the annotation class to a collection.
27 IAnnotateLayerPropertiesCollection annotateLayerPropsCollection = new
28 AnnotateLayerPropertiesCollectionClass();
29 annotateLayerPropsCollection.Add(annotateLayerProperties);
30
31 // Create a graphics layer scale object.
32 IGraphicsLayerScale graphicsLayerScale = new GraphicsLayerScaleClass();
33 graphicsLayerScale.ReferenceScale = referenceScale;
34 graphicsLayerScale.Units = referenceScaleUnits;
35
36 // Create the overposter properties for the standard label engine.
37 IOverposterProperties overposterProperties = new BasicOverposterPropertiesClass();
38
39 // Instantiate a class description object.
40 IObjectClassDescription ocDescription = new
41 AnnotationFeatureClassDescriptionClass();
42 IFeatureClassDescription fcDescription = (IFeatureClassDescription)ocDescription;
43
44 // Get the shape field from the class description‘s required fields.
45 IFields requiredFields = ocDescription.RequiredFields;
46 int shapeFieldIndex = requiredFields.FindField(fcDescription.ShapeFieldName);
47 IField shapeField = requiredFields.get_Field(shapeFieldIndex);
48 IGeometryDef geometryDef = shapeField.GeometryDef;
49 IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;
50 geometryDefEdit.SpatialReference_2 = spatialReference;
51
52 // Create the annotation layer factory.
53 IAnnotationLayerFactory annotationLayerFactory = new FDOGraphicsLayerFactoryClass();
54
55 // Create the annotation feature class and an annotation layer for it.
56 IAnnotationLayer annotationLayer = annotationLayerFactory.CreateAnnotationLayer
57 (featureWorkspace, featureDataset, className, geometryDef, null,
58 annotateLayerPropsCollection, graphicsLayerScale, symbolCollection, false,
59 false, false, true, overposterProperties, configKeyword);
60
61 // Get the feature class from the feature layer.
62 IFeatureLayer featureLayer = (IFeatureLayer)annotationLayer;
63 IFeatureClass featureClass = featureLayer.FeatureClass;
64
65 return featureClass;
66 }
2、创建Annotation要素（Annotation feature）
IFormattedTextSymbol接口的方案，博主并未测试，有需要可以戳下面链接：值得注意的是：
IGeometry pointGeometry 这个几何对象应该是一个IPoint;
esriTextHorizontalAlignment 与 esriTextVerticalAlignment指示这个point在Annotation元素（一个面Polygon）的哪个位置，借此确定放置位置。
ISymbolCollectionElement或者IFormattedTextSymbol还有更多的属性可以设置（本文不做补充），这些属性便是该要素记录各字段的值。 1 public void CreateAnnotationFeature(IGeometry pointGeometry,string text,string fontName,double fontSize,esriTextHorizontalAlignment horizontalAlignment,
2 esriTextVerticalAlignment verticalAlignment)
3 {
4 IFeature feature = featureClass.CreateFeature();
5
6 ISymbolCollectionElement symbolCollectionElement = new TextElementClass();
7 symbolCollectionElement.FontName = fontName;
8 symbolCollectionElement.Size = fontSize;
9 symbolCollectionElement.Text = text;
10 symbolCollectionElement.HorizontalAlignment = horizontalAlignment;
11 symbolCollectionElement.VerticalAlignment = verticalAlignment;
12 symbolCollectionElement.Geometry = pointGeometry;
13
14 IElement element = symbolCollectionElement as IElement;
15 IAnnotationFeature2 annotationFeature2 = feature as IAnnotationFeature2;
16 annotationFeature2.Annotation =element;
17 annotationFeature2.Status = esriAnnotationStatus.esriAnnoStatusPlaced;
18 feature.Store();
19 }
3、要素类添加为图层
1 IWorkspaceFactory workspaceFactory = new AccessWorkspaceFactoryClass();
2 IFeatureWorkspace featureWorkspace = workspaceFactory.OpenFromFile(mdbPath, 0) as IFeatureWorkspace;
3 IAnnotationLayerFactory annotationLayerFactory = new FDOGraphicsLayerFactoryClass();
4 IAnnotationLayer annotationLayer = annotationLayerFactory.OpenAnnotationLayer(featureWorkspace, null, "Annotation");
5 ILayer layer_Annotation = annotationLayer as ILayer;
6 layer_Annotation.Name = tfh + "_Annotation";
文章标题：ArcGis 创建Annotation注记要素类、添加注记要素 并加载到Activeview AO C#
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