Articolo
11/18/2011

TransformGroup Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents a composite Transform composed of other Transform objects.

Inheritance Hierarchy

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

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

Syntax

'Declaration
<ContentPropertyAttribute("Children", True)> _
Public NotInheritable Class TransformGroup _
    Inherits Transform

[ContentPropertyAttribute("Children", true)]
public sealed class TransformGroup : Transform

<TransformGroup>
  oneOrMoreTransforms
</TransformGroup>

XAML Values

oneOrMoreTransforms
One or more object elements for classes that derive from Transform. Typically these are the Silverlight defined classes RotateTransform, ScaleTransform, SkewTransform, TranslateTransform, MatrixTransform, or TransformGroup. Object elements defined here become members of the TransformCollection collection when code accesses the Children property at run time.

The TransformGroup type exposes the following members.

Constructors

	Name	Description
	TransformGroup	Initializes a new instance of the TransformGroup class.

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Properties

	Name	Description
	Children	Gets or sets the collection of child Transform objects.
	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.)
	Value	Gets the Matrix structure that describes the transformation represented by this TransformGroup.

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Methods

	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 Silverlight 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.)

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Fields

	Name	Description
	ChildrenProperty	Identifies the Children dependency property.

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Remarks

Use a TransformGroup when you want to apply multiple Transform operations to a single object.

In a composite transformation, the order of individual transformations is important. For example, if you first rotate, then scale, then translate, you get a different result than if you first translate, then rotate, then scale. One reason order is significant is that transformations like rotation and scaling are done with respect to the origin of the coordinate system. Scaling an object that is centered at the origin produces a different result than scaling an object that has been moved away from the origin. Similarly, rotating an object that is centered at the origin produces a different result than rotating an object that has been moved away from the origin.

In XAML usages, TransformGroup uses Children as its content property and supports implicit collection usage. Therefore, to declare transforms that will be in a TransformGroup in XAML, you declare one or more transforms as object elements, placing them in order as the child elements of the TransformGroup. Nesting more than one TransformGroup is permitted.

Examples

The following example shows the markup for using a TransformGroup to fill the RenderTransform property.

Run this sample

<StackPanel>
  <TextBlock FontSize="28" Text="Hello">
    <TextBlock.RenderTransform>
      <TransformGroup>
        <RotateTransform Angle="45" />
        <SkewTransform CenterX="0" CenterY="0" AngleX="60"/>
      </TransformGroup>
    </TextBlock.RenderTransform>
  </TextBlock>
</StackPanel>

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.

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