ScaleTransform Class
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Scales an object in the two-dimensional x-y coordinate system.
System.Windows::DependencyObject
System.Windows.Media::GeneralTransform
System.Windows.Media::Transform
System.Windows.Media::ScaleTransform
Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.
The ScaleTransform type exposes the following members.
| Name | Description | |
|---|---|---|
 | CenterX | Gets or sets the x-coordinate of the center point of this ScaleTransform. |
| CenterY | Gets or sets the y-coordinate of the center point of this ScaleTransform. |
| Dispatcher | Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.) |
| Inverse | Gets the inverse of this transform, if it exists. (Inherited from Transform.) |
| ScaleX | Gets or sets the x-axis scale factor. |
| ScaleY | Gets or sets the y-axis scale factor. |
| Name | Description | |
|---|---|---|
 | CheckAccess | Determines whether the calling thread has access to this object. (Inherited from DependencyObject.) |
| ClearValue | Clears the local value of a dependency property. (Inherited from DependencyObject.) |
| Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
 | Finalize | Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.) |
| GetAnimationBaseValue | Returns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.) |
| GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| GetValue | Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| ReadLocalValue | Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.) |
| SetValue | Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
| Transform | Transforms the specified point and returns the result. (Inherited from GeneralTransform.) |
| TransformBounds | Transforms the specified bounding box and returns an axis-aligned bounding box that is exactly large enough to contain it. (Inherited from Transform.) |
| TryTransform | Attempts to transform the specified point and returns a value that indicates whether the transformation was successful. (Inherited from Transform.) |
| Name | Description | |
|---|---|---|
  | CenterXProperty | Identifies the CenterX dependency property. |
| CenterYProperty | Identifies the CenterY dependency property. |
| ScaleXProperty | Identifies the ScaleX dependency property. |
| ScaleYProperty | Identifies the ScaleY dependency property. |
Use a ScaleTransform to stretch or shrink an object horizontally or vertically. The ScaleX property specifies the amount to stretch or shrink an object along the x-axis, and the ScaleY property specifies the amount to stretch or shrink an object along the y-axis. Scale operations are centered on the point specified by the CenterX and CenterY properties.
The local 0,0 for an object can be offset on a Canvas using Canvas::Left and Canvas::Top, but this does not count as a transform; the object retains its own local 0,0 in this case for transform purposes.
Multiple transforms can be applied with a TransformGroup. Custom transforms can be created with a MatrixTransform.
Transforms can alter the display of text in your application to create a decorative effect. The following illustration shows the second line of text scaled by 150% along the x-axis, and the third line of text scaled by 150% along the y-axis.
 Note: |
|---|
Scaling text is not the same as increasing the font size of text. Font sizes are calculated independently of each other in order to provide the best resolution at different sizes. Scaled text, on the other hand, preserves the proportions of the original-sized text. |
The following 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="1.5" /> </TextBlock.RenderTransform> </TextBlock> </StackPanel>
Transform objects can be accessed and manipulated by using code. One way to do this is to name the Transform and then access it by using code. The following example shows how to increase the ScaleX and ScaleY property values of a ScaleTransform applied to a Rectangle every time that Rectangle is clicked.
<StackPanel> <Rectangle MouseLeftButtonDown="HandleMouseButtonDown" 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>