ManipulationDelta.Scale 屬性

定義

命名空間:

System.Windows.Input

組件:

PresentationCore.dll

取得或設定操作已依照乘數調整大小的量。

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

屬性值

Vector

操作已調整大小的量。

範例

下列範例顯示 事件的事件處理程式 ManipulationDelta 。 這個範例會 Translation套用、 Scale與 Rotation 屬性來移動、重設大小及旋轉 Rectangle。 此範例是逐步解 說：建立您的第一個觸控應用程式中較大範例的一部分。

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

備註

Scale和 Expansion 屬性都會報告重設大小操作。 這兩者之間的差異是報告值的方式。 屬性 Scale 會將值報告為乘數。 如果 Scale 為 0.5，則會將操作解譯為將大小減少 50%。 如果 Scale 為 2，則會將操作解譯為將大小增加 100%。 屬性 Expansion 會報告裝置獨立單位 (每單位 1/96 英吋) 重設大小操作。