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();