IncrementalLassoHitTester Class

Definition

Namespace:

System.Windows.Ink

Assembly:

PresentationCore.dll

Dynamically hit tests a Stroke with a lasso.

public ref class IncrementalLassoHitTester : System::Windows::Ink::IncrementalHitTester

public class IncrementalLassoHitTester : System.Windows.Ink.IncrementalHitTester

type IncrementalLassoHitTester = class
    inherit IncrementalHitTester

Public Class IncrementalLassoHitTester
Inherits IncrementalHitTester

Inheritance

Object

IncrementalHitTester

IncrementalLassoHitTester

Examples

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;
        selectedStrokes.Add(selectedStroke);
    }

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

Private Sub selectionTester_SelectionChanged(ByVal sender As Object, _
    ByVal args As LassoSelectionChangedEventArgs)

    ' Change the color of all selected strokes to red.
    For Each selectedStroke As Stroke In args.SelectedStrokes
        selectedStroke.DrawingAttributes.Color = Colors.Red
        selectedStrokes.Add(selectedStroke)
    Next selectedStroke

    ' Change the color of all unselected strokes to 
    ' their original color.
    For Each unselectedStroke As Stroke In args.DeselectedStrokes
        unselectedStroke.DrawingAttributes.Color = inkDA.Color
        selectedStrokes.Remove(unselectedStroke)
    Next unselectedStroke

End Sub

Remarks

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

Properties

IsValid

Gets whether the IncrementalHitTester is hit testing. (Inherited from IncrementalHitTester)

Methods

AddPoint(Point)	Adds a Point to the IncrementalHitTester. (Inherited from IncrementalHitTester)
AddPoints(IEnumerable<Point>)	Adds points to the IncrementalHitTester. (Inherited from IncrementalHitTester)
AddPoints(StylusPointCollection)	Adds the specified StylusPoint objects to the IncrementalHitTester. (Inherited from IncrementalHitTester)
AddPointsCore(IEnumerable<Point>)	Adds points to the IncrementalHitTester.
EndHitTesting()	Releases resources used by the IncrementalHitTester. (Inherited from IncrementalHitTester)
Equals(Object)	Determines whether the specified object is equal to the current object. (Inherited from Object)
GetHashCode()	Serves as the default hash function. (Inherited from Object)
GetType()	Gets the Type of the current instance. (Inherited from Object)
MemberwiseClone()	Creates a shallow copy of the current Object. (Inherited from Object)
OnSelectionChanged(LassoSelectionChangedEventArgs)	Raises the SelectionChanged event.
ToString()	Returns a string that represents the current object. (Inherited from Object)

Events

SelectionChanged

Occurs when the lasso path selects or unselects an ink Stroke.