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IncrementalStrokeHitTester Class

Dynamically hit tests a stroke with an eraser path.


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

public class IncrementalStrokeHitTester : IncrementalHitTester

The IncrementalStrokeHitTester type exposes the following members.

Public propertyIsValidGets whether the IncrementalHitTester is hit testing. (Inherited from IncrementalHitTester.)

Public methodAddPointAdds a Point to the IncrementalHitTester. (Inherited from IncrementalHitTester.)
Public methodAddPoints(IEnumerable<Point>)Adds points to the IncrementalHitTester. (Inherited from IncrementalHitTester.)
Public methodAddPoints(StylusPointCollection)Adds the specified StylusPoint objects to the IncrementalHitTester. (Inherited from IncrementalHitTester.)
Protected methodAddPointsCoreAdds points to the IncrementalHitTester. (Overrides IncrementalHitTester.AddPointsCore(IEnumerable<Point>).)
Public methodEndHitTestingReleases resources used by the IncrementalHitTester. (Inherited from IncrementalHitTester.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodOnStrokeHitInfrastructure. Raises the StrokeHit event.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Public eventStrokeHitOccurs when the IncrementalStrokeHitTester intersects an ink Stroke.

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.
void eraseTester_StrokeHit(object sender,
    StrokeHitEventArgs args)
    StrokeCollection eraseResult =
    StrokeCollection strokesToReplace = new StrokeCollection();

    // Replace the old stroke with the new one.
    if (eraseResult.Count > 0)
        presenter.Strokes.Replace(strokesToReplace, eraseResult);


.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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