IncrementalStrokeHitTester Classe

Definição

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

public class IncrementalStrokeHitTester : System.Windows.Ink.IncrementalHitTester

type IncrementalStrokeHitTester = class
    inherit IncrementalHitTester

Public Class IncrementalStrokeHitTester
Inherits IncrementalHitTester

Herança

Object

IncrementalHitTester

IncrementalStrokeHitTester

Exemplos

O exemplo seguinte demonstra como apagar dinamicamente uma parte de um Stroke. Para criar um controlo que permita ao utilizador apagar tinta, veja Como: Apagar Tinta num Controlo Personalizado.

// 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 =
        args.GetPointEraseResults();
    StrokeCollection strokesToReplace = new StrokeCollection();
    strokesToReplace.Add(args.HitStroke);
   
    // Replace the old stroke with the new one.
    if (eraseResult.Count > 0)
    {
        presenter.Strokes.Replace(strokesToReplace, eraseResult);
    }
    else
    {
        presenter.Strokes.Remove(strokesToReplace);
    }
}

' 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

Observações

O IncrementalStrokeHitTester acerto testa os traços determinando quando o caminho do borracha cruza esse traço. Use o AddPoints método nos eventos da stylus para adicionar os pontos ao IncrementalStrokeHitTester. Quando os pontos somados ao IncrementalStrokeHitTester intersectam a Stroke, o IncrementalStrokeHitTester eleva o StrokeHit evento.