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AnnD2DThumbStyle Class

Base class for all thumb styles.
public abstract class AnnD2DThumbStyle : IAnnThumbStyle   
Public MustInherit Class AnnD2DThumbStyle  
   Implements IAnnThumbStyle  

AnnD2DThumbStyle is the default thumb style and renderer for the annotation objects in this platform. This is an abstract class that will implement most common operations, while actual rendering of the object is implemented in the derived class for the objects.

LEADTOOLS ships with the following thumb style implementations:

AnnD2DObjectRenderer is the class responsible for rendering annotation objects, as well as rendering the objects themselves, the object renderer is responsible for rendering the thumbs used when the object is in a selected state.

The framework will call AnnD2DObjectRenderer.RenderThumbs and AnnD2DObjectRenderer.RenderRotatePointThumbs to render the selection and rotation thumbs at a specified location. These method will then call the AnnD2DThumbStyle.Render of its LocationsThumbStyle, RotateCenterThumbStyle and RotateGripperThumbStyle objects to render the actual thumbs.

The annotations thumb style contains the following members:

Member Description

The size of the thumb in container units.


The style to use for filling the thumb.


The style to use for drawing the thumb.


Called by the framework to render a thumb at a specified location.


Called by the framework to check if a test point is on top of the thumb if rendered at a specified location.

When implementing a user-defined thumb style, one of the tasks required is to render the thumbs of an annotation object. You can derive your thumb style from this class and use its helper methods.


Target Platforms

Help Version 21.0.2021.3.2
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Leadtools.Annotations.Rendering.WinForms Assembly