ScaleTransform Class

Definition

Namespace:

Windows.UI.Xaml.Media

Scales an object in the two-dimensional x-y coordinate system.

public ref class ScaleTransform sealed : Transform

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
/// [Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
class ScaleTransform final : Transform

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
[Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
public sealed class ScaleTransform : Transform

Public NotInheritable Class ScaleTransform
Inherits Transform

<ScaleTransform .../>

Inheritance

Object Platform::Object IInspectable DependencyObject GeneralTransform Transform ScaleTransform

Attributes

ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

This XAML example uses a ScaleTransform to scale text from its original size.

<StackPanel>
    <TextBlock FontFamily="Verdana"
               FontSize="32"
               FontWeight="Bold" 
               Foreground="SteelBlue"
               Text="Scaled Text" />

    <!-- Scale the text width using a ScaleTransform. -->
    <TextBlock FontFamily="Verdana"
               FontSize="32"
               FontWeight="Bold"
               Foreground="SteelBlue"
               Text="Scaled Text">
        <TextBlock.RenderTransform>
            <ScaleTransform ScaleX="1.5" ScaleY="1.0" />
        </TextBlock.RenderTransform>
    </TextBlock>

    <!-- Scale the text height using a ScaleTransform. -->
    <TextBlock FontFamily="Verdana"
               FontSize="32"
               FontWeight="Bold" 
               Foreground="SteelBlue"
               Text="Scaled Text">
        <TextBlock.RenderTransform>
            <ScaleTransform ScaleX="1.0" ScaleY="2.0" />
        </TextBlock.RenderTransform>
    </TextBlock>
</StackPanel>

The text looks like this after the transform is applied:

This example shows how you can access and modify a transform in code at runtime. Each time the rectangle is pressed, the scale is increased.

<StackPanel>
  <Rectangle PointerPressed="HandlePointerPressed"
    Width="50" Height="50" Fill="RoyalBlue">
    <Rectangle.RenderTransform>

      <!-- If you give the transform a name you can 
        access it easily from code. -->
      <ScaleTransform x:Name="myScaleTransform" />
    </Rectangle.RenderTransform>
  </Rectangle>
</StackPanel>

private void HandlePointerPressed(object sender, PointerRoutedEventArgs e)
{
    // Increase ScaleX and ScaleY by 25%.
    myScaleTransform.ScaleX = myScaleTransform.ScaleX * 1.25;
    myScaleTransform.ScaleY = myScaleTransform.ScaleY * 1.25;
}

Private Sub HandlePointerPressed(ByVal sender As Object, ByVal e As PointerRoutedEventArgs)
    ' Increase ScaleX and ScaleY by 25%.
    myScaleTransform.ScaleX = (myScaleTransform.ScaleX * 1.25)
    myScaleTransform.ScaleY = (myScaleTransform.ScaleY * 1.25)
End Sub

Constructors

ScaleTransform()

Initializes a new instance of the ScaleTransform class.

Properties

CenterX	Gets or sets the x-coordinate of the center point of this ScaleTransform.
CenterXProperty	Identifies the CenterX dependency property.
CenterY	Gets or sets the y-coordinate of the center point of this ScaleTransform.
CenterYProperty	Identifies the CenterY dependency property.
Dispatcher	Gets the CoreDispatcher that this object is associated with. The CoreDispatcher represents a facility that can access the DependencyObject on the UI thread even if the code is initiated by a non-UI thread. (Inherited from DependencyObject)
Inverse	Gets the inverse transformation of this GeneralTransform, if possible. (Inherited from GeneralTransform)
InverseCore	Implements the behavior for return value of Inverse in a derived or custom GeneralTransform. (Inherited from GeneralTransform)
ScaleX	Gets or sets the x-axis scale factor.
ScaleXProperty	Identifies the ScaleX dependency property.
ScaleY	Gets or sets the y-axis scale factor.
ScaleYProperty	Identifies the ScaleY dependency property.

Methods

ClearValue(DependencyProperty)	Clears the local value of a dependency property. (Inherited from DependencyObject)
GetAnimationBaseValue(DependencyProperty)	Returns any base value established for a dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject)
GetValue(DependencyProperty)	Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject)
ReadLocalValue(DependencyProperty)	Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject)
RegisterPropertyChangedCallback(DependencyProperty, DependencyPropertyChangedCallback)	Registers a notification function for listening to changes to a specific DependencyProperty on this DependencyObject instance. (Inherited from DependencyObject)
SetValue(DependencyProperty, Object)	Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject)
TransformBounds(Rect)	Transforms the specified bounding box and returns an axis-aligned bounding box that is exactly large enough to contain it. (Inherited from GeneralTransform)
TransformBoundsCore(Rect)	Provides the means to override the TransformBounds behavior in a derived transform class. (Inherited from GeneralTransform)
TransformPoint(Point)	Uses this transformation object's logic to transform the specified point, and returns the result. (Inherited from GeneralTransform)
TryTransform(Point, Point)	Attempts to transform the specified point and returns a value that indicates whether the transformation was successful. (Inherited from GeneralTransform)
TryTransformCore(Point, Point)	Provides the means to override the TryTransform behavior in a derived transform class. (Inherited from GeneralTransform)
UnregisterPropertyChangedCallback(DependencyProperty, Int64)	Cancels a change notification that was previously registered by calling RegisterPropertyChangedCallback. (Inherited from DependencyObject)

See also

• Transform
• XAML two-dimensional transforms sample