IncrementalHitTester Class

IncrementalHitTester Class


Dynamically performs hit testing on a Stroke.

Namespace:   System.Windows.Ink
Assembly:  PresentationCore (in PresentationCore.dll)

public abstract class IncrementalHitTester


Gets whether the IncrementalHitTester is hit testing.


Adds a Point to the IncrementalHitTester.


Adds points to the IncrementalHitTester.


Adds the specified StylusPoint objects to the IncrementalHitTester.


This API supports the product infrastructure and is not intended to be used directly from your code. Adds points to the IncrementalHitTester.


Releases resources used by the IncrementalHitTester.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

The IncrementalHitTester dynamically determines whether the user "hits" a Stroke. This class enables you to provide immediate feedback to the user in situations such as selecting and erasing ink.

There are two classes that inherit from IncrementalHitTester:

The following table lists where to learn how to manage digital ink on a custom control.

To do this…

See this article

Create a control that collects digital ink

Creating an Ink Input Control

Create a control that enables the user to select ink

How to: Select Ink from a Custom Control

Create a control that enables the user to point-erase ink

How to: Erase Ink on a Custom Control

This class is not typically used in XAML.

The following example demonstrates how to add points to the IncrementalHitTester when the user inputs data with the stylus. The example includes a StrokeHit event handler that erases the part of the Stroke that the user intersects. To create a control that enables a user to erase ink, see How to: Erase Ink on a Custom Control.

.NET Framework
Available since 3.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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