Question

如何用ArcGIS Engine+C#net实现注记功能

Answer 1

以前用VC写的代码。。自己翻译吧。
具体参数是 pLayer 标注图层，pFontDisp 标注字体，pColor标注字体的颜色，
bstrExpression 表示你用哪个字段进行标注 m_bViewLabel 表示是否显示标注。

BOOL CDGGisFrameView::LabelLayer(ILayerPtr pLayer, IFontDispPtr pFontDisp, IColorPtr pColor, CComBSTR bstrExpression,BOOL m_bViewLabel)
{

if (pLayer==NULL)
{
return FALSE;
}
if (bstrExpression=="")
{
return FALSE;
}
IFeatureLayerPtr pFeatureLayer;
IGeoFeatureLayerPtr pGeoFeatureLayer;
pFeatureLayer=(IFeatureLayerPtr)pLayer;
pGeoFeatureLayer=(IGeoFeatureLayerPtr)pFeatureLayer;

ITrackCancelPtr pTrackCancel(CLSID_CancelTracker);
IActiveViewPtr pView=m_wndViewPage2D.m_ctrlMap.GetMap();
IScreenDisplayPtr pScreenDisplay;
pView->get_ScreenDisplay(&pScreenDisplay);
IDisplayPtr pDisplay=(IDisplayPtr)pScreenDisplay;

if (m_bViewLabel==FALSE)
{
pGeoFeatureLayer->put_DisplayAnnotation(VARIANT_FALSE);
pView->Refresh();
return TRUE;
}

else
{
pGeoFeatureLayer->put_DisplayAnnotation(VARIANT_TRUE);
}

IAnnotateLayerPropertiesPtr pALP(CLSID_LabelEngineLayerProperties);
pALP->putref_FeatureLayer(pGeoFeatureLayer);
IEnvelopePtr pEnv;
pEnv=m_wndViewPage2D.m_ctrlMap.GetExtent();
pALP->put_Extent(pEnv);
ILabelEngineLayerPropertiesPtr pLELP;
pLELP=pALP;

ITextSymbolPtr pTextSymbol;
pLELP->get_Symbol(&pTextSymbol);
if (pColor!=NULL)
{
IRgbColorPtr pRgbColor(CLSID_RgbColor);
pRgbColor=pColor;
pTextSymbol->put_Color(pColor);
}

if (pFontDisp!=NULL)
{
pTextSymbol->put_Font(pFontDisp);
}

pLELP->put_Expression((BSTR)bstrExpression);
IAnnotateLayerPropertiesCollectionPtr pCol;
pGeoFeatureLayer->get_AnnotationProperties(&pCol);
pCol->Clear();
pCol->Add(pALP);

HRESULT hr=pGeoFeatureLayer->Draw((esriDrawPhase)esriDPAnnotation,pDisplay,pTrackCancel);
if (FAILED(hr))
{
return FALSE;
}
pView->Refresh();
return TRUE;

}