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IncrementalLassoHitTester Class

Dynamically hit tests a Stroke with a lasso.

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

public class IncrementalLassoHitTester : IncrementalHitTester
public class IncrementalLassoHitTester extends IncrementalHitTester
public class IncrementalLassoHitTester extends IncrementalHitTester
You cannot use this managed class in XAML.

The IncrementalLassoHitTester hit tests strokes by determining whether a lasso path surrounds it. Use the AddPoints method in the stylus events to add the points to the IncrementalLassoHitTester. When the points added to the IncrementalLassoHitTester selects or unselects a Stroke, the IncrementalLassoHitTester raises the SelectionChanged event

The following example demonstrates how to dynamically select strokes in a custom control. For the entire sample, see How to: Select Ink from a Custom Control

void selectionTester_SelectionChanged(object sender,
    LassoSelectionChangedEventArgs args)
    // Change the color of all selected strokes to red.
    foreach (Stroke selectedStroke in args.SelectedStrokes)
        selectedStroke.DrawingAttributes.Color = Colors.Red;


    // Change the color of all unselected strokes to 
    // their original color.
    foreach (Stroke unselectedStroke in args.DeselectedStrokes)
        unselectedStroke.DrawingAttributes.Color = inkDA.Color;


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 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0