![](dotnetdiagramimages/MESCIUS_ActiveReports_Core_Rendering_GrapeCity_DataVisualization_Chart__NeedleAnnotationOverlayDefinition.png)
'宣言
Public Class _NeedleAnnotationOverlayDefinition Inherits _LineAnnotationDefinition Implements IAnnotationOverlayDefinition, ILegendOverlayDefinition, ILineAnnotationDefinition, IOverlayDefinition, IQueryInterface
public class _NeedleAnnotationOverlayDefinition : _LineAnnotationDefinition, IAnnotationOverlayDefinition, ILegendOverlayDefinition, ILineAnnotationDefinition, IOverlayDefinition, IQueryInterface
System.Object
GrapeCity.DataVisualization.Chart._BaseOverlayDefinition<TOption>
GrapeCity.DataVisualization.Chart._BaseAnnotationOverlayDefinition<TOption>
GrapeCity.DataVisualization.Chart._LineAnnotationDefinition
GrapeCity.DataVisualization.Chart._NeedleAnnotationOverlayDefinition