ScaleTransform Class (System.Windows.Media)

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Microsoft Silverlight 3

Other versions are also available for the following:

.NET Framework Class Library for Silverlight

ScaleTransform Class

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

Namespace: System.Windows.Media
Assembly: System.Windows (in System.Windows.dll)

Syntax

Visual Basic (Declaration)

Public NotInheritable Class ScaleTransform _
    Inherits Transform

Visual Basic (Usage)

Dim instance As ScaleTransform

public sealed class ScaleTransform : Transform

XAML Object Element Usage

<ScaleTransform .../>

Remarks

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.

TextBlock using a ScaleTransform

ms635521.JOLT_transformedtext02(en-us,VS.95).png

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.

Examples

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

Run this sample

XAML

<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.

Run this sample

XAML

<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>

Visual Basic

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

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

Inheritance Hierarchy

System..::.Object
  System.Windows..::.DependencyObject
    System.Windows.Media..::.GeneralTransform
      System.Windows.Media..::.Transform
        System.Windows.Media..::.ScaleTransform

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Reference

ScaleTransform Members

System.Windows.Media Namespace

Other Resources

Transforms