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CreateCirclebyFeedbackpublicsealedclassCreateCircleTool:BaseTool{IHookHelperm_hookHelper=newHookHelperClass();IMapm_Map;IActiveViewm_ActiveView;INewCircleFeedbackpCircleFeedback;IFeatureLayerm_pCurrentLayer;publicCreateCircleTool(IFeatureLayerfeatureLayer){……m_pCurrentLayer=featureLayer;}publicoverridevoidOnCreate(objecthook){m_hookHelper.Hook=hook;m_ActiveView=m_hookHelper.ActiveView;m_Map=m_hookHelper.FocusMap;}publicoverridevoidOnMouseDown(intButton,intShift,intX,intY){//获得鼠标在控件上点击的位置,产生一个点对象IPointpPt=m_ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X,Y);if(pCircleFeedback==null){pCircleFeedback=newNewCircleFeedbackClass();pCircleFeedback.Display=m_ActiveView.ScreenDisplay;pCircleFeedback.Start(pPt);}}publicoverridevoidOnMouseMove(intButton,intShift,intX,intY){IPointpPt=m_ActiveView.ScreenDisplay.DisplayTransformation.ToMapPoint(X,Y);//MoveTo方法继承自IDisplayFeedback接口的定义if(pCircleFeedback!=null)pCircleFeedback.MoveTo(pPt);}publicoverridevoidOnMouseUp(intButton,intShift,intX,intY){IGeometrypGeo=null;pGeo=pCircleFeedback.Stop();pCircleFeedback=null;CreateFeature(pGeo);}privatevoidCreateFeature(IGeometrypGeom){IWorkspaceEditpWorkspaceEdit=GetWorkspaceEdit();IFeatureLayerpFeatureLayer=(IFeatureLayer)m_pCurrentLayer;IFeatureClasspFeatureClass=pFeatureLayer.FeatureClass;IConstructCircularArcpConstructArc=pGeomasIConstructCircularArc;IPolygonpPolygon=newPolygonClass();ISe
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