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IncrementalStrokeHitTester Class

Dynamically hit tests a stroke with an eraser path.

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

'Declaration
Public Class IncrementalStrokeHitTester _
	Inherits IncrementalHitTester
'Usage
Dim instance As IncrementalStrokeHitTester
You cannot directly create an instance of this class in XAML.

The IncrementalStrokeHitTester hit tests strokes by determining when a eraser path intersects that stroke. Use the AddPoints(Point) method in the stylus events to add the points to the IncrementalStrokeHitTester. When the points added to the IncrementalStrokeHitTester intersect a Stroke, the IncrementalStrokeHitTester raises the StrokeHit event.

The following example demonstrates how to dynamically erase a portion of a Stroke. To create a control that enables a user to erase ink, see How to: Erase Ink on a Custom Control.

' When the stylus intersects a stroke, erase that part of 
' the stroke.  When the stylus dissects a stoke, the  
' Stroke.Erase method returns a StrokeCollection that contains 
' the two new strokes. 
Private Sub eraseTester_StrokeHit(ByVal sender As Object, _
        ByVal args As StrokeHitEventArgs)

    Dim eraseResult As StrokeCollection = _
        args.GetPointEraseResults()
    Dim strokesToReplace As New StrokeCollection()
    strokesToReplace.Add(args.HitStroke)

    ' Replace the old stroke with the new one. 
    If eraseResult.Count > 0 Then
        presenter.Strokes.Replace(strokesToReplace, eraseResult)
    Else
        presenter.Strokes.Remove(strokesToReplace)
    End If 

End Sub 'eraseTester_StrokeHit 

System.Object
  System.Windows.Ink.IncrementalHitTester
    System.Windows.Ink.IncrementalStrokeHitTester

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

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0
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