RotateTransform Class

Rotates an object clockwise about a specified point in a two-dimensional x-y coordinate system.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.GeneralTransform
      System.Windows.Media.Transform
        System.Windows.Media.RotateTransform

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

Syntax

'Declaration
Public NotInheritable Class RotateTransform _
    Inherits Transform
public sealed class RotateTransform : Transform
<RotateTransform .../>

The RotateTransform type exposes the following members.

Constructors

  Name Description
Public methodSupported by Silverlight for Windows Phone RotateTransform Initializes a new instance of the RotateTransform class.

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Properties

  Name Description
Public propertySupported by Silverlight for Windows Phone Angle Gets or sets the angle, in degrees, of clockwise rotation.
Public propertySupported by Silverlight for Windows Phone CenterX Gets or sets the x-coordinate of the rotation center point.
Public propertySupported by Silverlight for Windows Phone CenterY Gets or sets the y-coordinate of the rotation center point.
Public propertySupported by Silverlight for Windows Phone Dispatcher Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
Public propertySupported by Silverlight for Windows Phone Inverse Gets the inverse of this transform, if it exists. (Inherited from Transform.)

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Methods

  Name Description
Public methodSupported by Silverlight for Windows Phone CheckAccess Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone ClearValue Clears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows Phone 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.)
Public methodSupported by Silverlight for Windows Phone GetAnimationBaseValue Returns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetType Gets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetValue Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Protected methodSupported by Silverlight for Windows Phone MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone ReadLocalValue Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone SetValue Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone ToString Returns a string that represents the current object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone Transform Transforms the specified point and returns the result. (Inherited from GeneralTransform.)
Public methodSupported by Silverlight for Windows Phone TransformBounds Transforms the specified bounding box and returns an axis-aligned bounding box that is exactly large enough to contain it. (Inherited from Transform.)
Public methodSupported by Silverlight for Windows Phone TryTransform Attempts to transform the specified point and returns a value that indicates whether the transformation was successful. (Inherited from Transform.)

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Fields

  Name Description
Public fieldStatic memberSupported by Silverlight for Windows Phone AngleProperty Identifies the Angle dependency property.
Public fieldStatic memberSupported by Silverlight for Windows Phone CenterXProperty Identifies the CenterX dependency property.
Public fieldStatic memberSupported by Silverlight for Windows Phone CenterYProperty Identifies the CenterY dependency property.

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Remarks

A RotateTransform is defined by the following properties: Angle rotates an object by a specified angle about the point CenterX, CenterY.

When you use a RotateTransform, the transformation rotates the coordinate system for a particular object about the origin point for its frame of reference. Therefore, depending on the position of the object, it might not rotate in place (around its center). For example, if an object is positioned 200 units from 0 along the x-axis, a rotation of 30 degrees can swing the object 30 degrees along a circle that has a radius of 200, which is drawn around the origin. To rotate an object in place, set the CenterX and CenterY of the RotateTransform to the center of the object to rotate.

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.

Examples

Transforms can alter the display of text in your application to create a decorative effect. The following example shows text rotated 90 degrees using a RotateTransform.

TextBlock using a RotateTransform

Diagram showing rotated text.

The following example uses a RotateTransform to rotate text. An Angle value of 90 rotates the element 90 degrees clockwise.

<!-- Rotate the text 90 degrees using a RotateTransform. -->
<TextBlock Text="Rotated Text" FontSize="32" Foreground="Teal">
  <TextBlock.RenderTransform>
    <RotateTransform Angle="90" />
  </TextBlock.RenderTransform>
</TextBlock>

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 its name. The following example shows how to increase the ScaleX and ScaleY property values of a ScaleTransform applied to a Rectangle every time the Rectangle is clicked.

Run this sample

<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>
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;
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

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

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.

See Also

Reference

Other Resources