ManipulationDelta.Scale Property
Definition
Important
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Gets or sets the amount the manipulation has resized as a multiplier.
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
Property Value
The amount the manipulation has resized.
Examples
The following example shows an event handler for the ManipulationDelta event. The example applies the Translation, Scale, and Rotation properties to move, resize, and rotate a Rectangle. This example is part of a larger example in Walkthrough: Creating Your First Touch Application.
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
Remarks
The Scale and Expansion properties both report a resizing manipulation. The difference between the two is the way in which the value is reported. The Scale property reports the value as a multiplier. If Scale is 0.5, the manipulation is interpreted as decreasing the size by 50 percent. If Scale is 2, the manipulation is interpreted as increasing the size by 100 percent. The Expansion property reports the resizing manipulation in device-independent units (1/96th inch per unit).
Applies to
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