ManipulationDelta.Scale Properti

Definisi

Ruang nama:

System.Windows.Input

Rakitan:

PresentationCore.dll

Mendapatkan atau menetapkan jumlah yang telah diubah ukuran manipulasinya sebagai pengali.

public:
 property System::Windows::Vector Scale { System::Windows::Vector get(); };

public System.Windows.Vector Scale { get; }

member this.Scale : System.Windows.Vector

Public ReadOnly Property Scale As Vector

Nilai Properti

Vector

Jumlah yang telah diubah ukuran manipulasinya.

Contoh

Contoh berikut menunjukkan penanganan aktivitas untuk peristiwa tersebut ManipulationDelta . Contoh menerapkan Translationproperti , Scale, dan Rotation untuk memindahkan, mengubah ukuran, dan memutar Rectangle. Contoh ini adalah bagian dari contoh yang lebih besar di Walkthrough: Membuat Aplikasi Sentuhan Pertama Anda.

void Window_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
    
    // Get the Rectangle and its RenderTransform matrix.
    Rectangle rectToMove = e.OriginalSource as Rectangle;
    Matrix rectsMatrix = ((MatrixTransform)rectToMove.RenderTransform).Matrix;

    // Rotate the Rectangle.
    rectsMatrix.RotateAt(e.DeltaManipulation.Rotation, 
                         e.ManipulationOrigin.X, 
                         e.ManipulationOrigin.Y);

    // Resize the Rectangle.  Keep it square 
    // so use only the X value of Scale.
    rectsMatrix.ScaleAt(e.DeltaManipulation.Scale.X, 
                        e.DeltaManipulation.Scale.X, 
                        e.ManipulationOrigin.X,
                        e.ManipulationOrigin.Y);

    // Move the Rectangle.
    rectsMatrix.Translate(e.DeltaManipulation.Translation.X,
                          e.DeltaManipulation.Translation.Y);

    // Apply the changes to the Rectangle.
    rectToMove.RenderTransform = new MatrixTransform(rectsMatrix);

    Rect containingRect =
        new Rect(((FrameworkElement)e.ManipulationContainer).RenderSize);

    Rect shapeBounds =
        rectToMove.RenderTransform.TransformBounds(
            new Rect(rectToMove.RenderSize));

    // Check if the rectangle is completely in the window.
    // If it is not and intertia is occuring, stop the manipulation.
    if (e.IsInertial && !containingRect.Contains(shapeBounds))
    {
        e.Complete();
    }

    e.Handled = true;
}

Private Sub Window_ManipulationDelta(ByVal sender As Object, ByVal e As ManipulationDeltaEventArgs)

    ' Get the Rectangle and its RenderTransform matrix.
    Dim rectToMove As Rectangle = e.OriginalSource
    Dim rectTransform As MatrixTransform = rectToMove.RenderTransform
    Dim rectsMatrix As Matrix = rectTransform.Matrix


    ' Rotate the shape
    rectsMatrix.RotateAt(e.DeltaManipulation.Rotation,
                         e.ManipulationOrigin.X,
                         e.ManipulationOrigin.Y)

    ' Resize the Rectangle. Keep it square 
    ' so use only the X value of Scale.
    rectsMatrix.ScaleAt(e.DeltaManipulation.Scale.X,
                        e.DeltaManipulation.Scale.X,
                        e.ManipulationOrigin.X,
                        e.ManipulationOrigin.Y)

    'move the center
    rectsMatrix.Translate(e.DeltaManipulation.Translation.X,
                          e.DeltaManipulation.Translation.Y)

    ' Apply the changes to the Rectangle.
    rectTransform = New MatrixTransform(rectsMatrix)
    rectToMove.RenderTransform = rectTransform

    Dim container As FrameworkElement = e.ManipulationContainer
    Dim containingRect As New Rect(container.RenderSize)

    Dim shapeBounds As Rect = rectTransform.TransformBounds(
                                New Rect(rectToMove.RenderSize))

    ' Check if the rectangle is completely in the window.
    ' If it is not and intertia is occuring, stop the manipulation.
    If e.IsInertial AndAlso Not containingRect.Contains(shapeBounds) Then
        e.Complete()
    End If

    e.Handled = True
End Sub

Keterangan

Properti Scale dan Expansion keduanya melaporkan manipulasi perubahan ukuran. Perbedaan antara keduanya adalah cara di mana nilai dilaporkan. Properti Scale melaporkan nilai sebagai pengali. Jika Scale 0,5, manipulasi ditafsirkan sebagai mengurangi ukuran sebesar 50 persen. Jika Scale adalah 2, manipulasi ditafsirkan sebagai meningkatkan ukuran sebesar 100 persen. Properti Expansion melaporkan manipulasi mengubah ukuran di unit independen perangkat (1/96 inci per unit).