arcEngine添加标注(上)

arcEngine添加标注有3个技术点：1，获得图层的属性字段；2，初始化符号显示控件；3，添加标注。

获得图层的属性字段：

  //每个图层都是一个表的图形化显示，ILayer跟ITale可以互相转换

    ITable pTable = pLayer as ITable;

            IField pField = null;

            for (int i = 0; i < pTable.Fields.FieldCount; i++)

            {

                pField = pTable.Fields.get_Field(i);   

//下面3种类型的字段不能显示                      

              if(pField.Type!=esriFieldType.esriFieldTypeXML&&

                      pField.Type!=esriFieldType.esriFieldTypeRaster&&pField.Type!=esriFieldType.esriFieldTypeGeometry)

                cmbField.Items.Add(pField.AliasName);

            }

初始化符号显示控件：

string sInstall = ESRI.ArcGIS.RuntimeManager.ActiveRuntime.Path;   //获得arcgis的安装路径        

         axSymbologyControl1.LoadStyleFile(sInstall + "\\Styles\\ESRI.ServerStyle");  //打开样式文件

//显示文字符号（esriStyleClassTextSymbols）

        axSymbologyControl1.GetStyleClass(esriSymbologyStyleClass.esriStyleClassTextSymbols).SelectItem(0);

 

添加标注：

IGeoFeatureLayer geoFeatureLayer = pLayer as IGeoFeatureLayer;

         //AnnotationProperties属性控制标注的内容、格式

            geoFeatureLayer.AnnotationProperties.Clear();

  //标注放置的位置

            IBasicOverposterLayerProperties blProperty = new BasicOverposterLayerPropertiesClass();

            ILabelEngineLayerProperties llProperty = new LabelEngineLayerPropertiesClass();

 

            ITextSymbol textSymbol = new TextSymbolClass();   

            textSymbol = (ITextSymbol)styleGalleryItem.Item;     

            IColor ic = new RgbColorClass();

            ic.RGB = colorPickerButton1.SelectedColor.B * 65536 + colorPickerButton1.SelectedColor.G * 256 + colorPickerButton1.SelectedColor.R;

            textSymbol.Color = ic;

 

            stdole.IFontDisp tempFont = new stdole.StdFont() as stdole.IFontDisp;

            tempFont.Name = cmbFont.SelectedNode.Text;

            DevComponents.Editors.ComboItem cmbItem = (DevComponents.Editors.ComboItem)cmbSize.SelectedItem;

            tempFont.Size = Convert.ToDecimal(cmbItem.Text);

            textSymbol.Font = tempFont;

            textSymbol.HorizontalAlignment = esriTextHorizontalAlignment.esriTHACenter;

 

   //标注内容表达式

            string pLabel = "[" + (string)cmbField.SelectedItem + "]";

            llProperty.Expression = pLabel;

           //复杂表达式，下次博客内容

            if (cmbField.SelectedIndex == cmbField.Items.Count - 1)

            {

                llProperty.IsExpressionSimple = false;

                IAnnotationExpressionEngine annoEE = new AnnotationJScriptEngine();

                llProperty.ExpressionParser = annoEE;

                llProperty.Expression = fieldExpression;

            }

            //llProperty.ExpressionParser

 

            blProperty.NumLabelsOption = esriBasicNumLabelsOption.esriOneLabelPerShape;

            llProperty.BasicOverposterLayerProperties = blProperty;

            llProperty.Symbol = textSymbol;

            geoFeatureLayer.AnnotationProperties.Add(llProperty as IAnnotateLayerProperties);

            geoFeatureLayer.DisplayAnnotation = true;

            pMap.Refresh();