IncrementalStrokeHitTester Class
Dynamically hit tests a stroke with an eraser path.
Assembly: PresentationCore (in PresentationCore.dll)
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
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.