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SkewTransform Class

Represents a 2-D skew.

Namespace:  System.Windows.Media
Assembly:  PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public sealed class SkewTransform : Transform
<SkewTransform .../>

The SkewTransform type exposes the following members.

  NameDescription
Public methodSkewTransform()Initializes a new instance of the SkewTransform class.
Public methodSkewTransform(Double, Double)Initializes a new instance of the SkewTransform class that has the specified x- and y-axes angles and is centered on the origin.
Public methodSkewTransform(Double, Double, Double, Double)Initializes a new instance of the SkewTransform class that has the specified x- and y-axes angles and center.
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  NameDescription
Public propertyAngleXGets or sets the x-axis skew angle, which is measured in degrees counterclockwise from the y-axis.
Public propertyAngleYGets or sets the y-axis skew angle, which is measured in degrees counterclockwise from the x-axis.
Public propertyCanFreezeGets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)
Public propertyCenterXGets or sets the x-coordinate of the transform center.
Public propertyCenterYGets or sets the y-coordinate of the transform center.
Public propertyDependencyObjectTypeGets the DependencyObjectType that wraps the CLR type of this instance.  (Inherited from DependencyObject.)
Public propertyDispatcherGets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)
Public propertyHasAnimatedPropertiesGets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties. (Inherited from Animatable.)
Public propertyInverseGets the inverse of this transform, if it exists. (Inherited from Transform.)
Public propertyIsFrozenGets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.)
Public propertyIsSealedGets a value that indicates whether this instance is currently sealed (read-only). (Inherited from DependencyObject.)
Public propertyValueGets the current transformation value as a Matrix. (Overrides Transform.Value.)
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  NameDescription
Public methodApplyAnimationClock(DependencyProperty, AnimationClock)Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable.)
Public methodApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable.)
Public methodBeginAnimation(DependencyProperty, AnimationTimeline)Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable.)
Public methodBeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable.)
Public methodCheckAccessDetermines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Public methodClearValue(DependencyProperty)Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.)
Public methodClearValue(DependencyPropertyKey)Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.)
Public methodCloneCreates a modifiable copy of this SkewTransform by making deep copies of its values.
Protected methodCloneCoreMakes the instance a clone (deep copy) of the specified Freezable using base (non-animated) property values. (Inherited from Freezable.)
Public methodCloneCurrentValueCreates a modifiable copy of this SkewTransform object by making deep copies of its values. This method does not copy resource references, data bindings, or animations, although it does copy their current values.
Protected methodCloneCurrentValueCoreMakes the instance a modifiable clone (deep copy) of the specified Freezable using current property values. (Inherited from Freezable.)
Public methodCoerceValueCoerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject. (Inherited from DependencyObject.)
Protected methodCreateInstanceInitializes a new instance of the Freezable class. (Inherited from Freezable.)
Protected methodCreateInstanceCoreWhen implemented in a derived class, creates a new instance of the Freezable derived class. (Inherited from Freezable.)
Public methodEqualsDetermines whether a provided DependencyObject is equivalent to the current DependencyObject. (Inherited from DependencyObject.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodFreeze()Makes the current object unmodifiable and sets its IsFrozen property to true. (Inherited from Freezable.)
Protected methodFreezeCoreMakes this Animatable object unmodifiable or determines whether it can be made unmodifiable. (Inherited from Animatable.)
Public methodGetAnimationBaseValueReturns the non-animated value of the specified DependencyProperty. (Inherited from Animatable.)
Public methodGetAsFrozenCreates a frozen copy of the Freezable, using base (non-animated) property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)
Protected methodGetAsFrozenCoreMakes the instance a frozen clone of the specified Freezable using base (non-animated) property values. (Inherited from Freezable.)
Public methodGetCurrentValueAsFrozenCreates a frozen copy of the Freezable using current property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)
Protected methodGetCurrentValueAsFrozenCoreMakes the current instance a frozen clone of the specified Freezable. If the object has animated dependency properties, their current animated values are copied. (Inherited from Freezable.)
Public methodGetHashCodeGets a hash code for this DependencyObject. (Inherited from DependencyObject.)
Public methodGetLocalValueEnumeratorCreates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)
Public methodInvalidatePropertyRe-evaluates the effective value for the specified dependency property (Inherited from DependencyObject.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodOnChangedCalled when the current Freezable object is modified. (Inherited from Freezable.)
Protected methodOnFreezablePropertyChanged(DependencyObject, DependencyObject)Ensures that appropriate context pointers are established for a DependencyObjectType data member that has just been set. (Inherited from Freezable.)
Protected methodOnFreezablePropertyChanged(DependencyObject, DependencyObject, DependencyProperty)This member supports the Windows Presentation Foundation (WPF) infrastructure and is not intended to be used directly from your code. (Inherited from Freezable.)
Protected methodOnPropertyChangedOverrides the DependencyObject implementation of OnPropertyChanged to also invoke any Changed handlers in response to a changing dependency property of type Freezable. (Inherited from Freezable.)
Public methodReadLocalValueReturns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)
Protected methodReadPreambleEnsures that the Freezable is being accessed from a valid thread. Inheritors of Freezable must call this method at the beginning of any API that reads data members that are not dependency properties. (Inherited from Freezable.)
Public methodSetCurrentValueSets the value of a dependency property without changing its value source. (Inherited from DependencyObject.)
Public methodSetValue(DependencyProperty, Object)Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.)
Public methodSetValue(DependencyPropertyKey, Object)Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.)
Protected methodShouldSerializePropertyReturns a value that indicates whether serialization processes should serialize the value for the provided dependency property. (Inherited from DependencyObject.)
Public methodToString()Creates a string representation of this GeneralTransform. (Inherited from GeneralTransform.)
Public methodToString(IFormatProvider)Creates a string representation of this instance, based on the passed IFormatProvider parameter. (Inherited from GeneralTransform.)
Public methodTransformTransforms the specified point and returns the result. (Inherited from GeneralTransform.)
Public methodTransformBoundsTransforms the specified bounding box and returns an axis-aligned bounding box that is exactly large enough to contain it. (Inherited from Transform.)
Public methodTryTransformAttempts to transform the specified point and returns a value that indicates whether the transformation was successful. (Inherited from Transform.)
Public methodVerifyAccessEnforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Protected methodWritePostscriptRaises the Changed event for the Freezable and invokes its OnChanged method. Classes that derive from Freezable should call this method at the end of any API that modifies class members that are not stored as dependency properties. (Inherited from Freezable.)
Protected methodWritePreambleVerifies that the Freezable is not frozen and that it is being accessed from a valid threading context. Freezable inheritors should call this method at the beginning of any API that writes to data members that are not dependency properties. (Inherited from Freezable.)
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  NameDescription
Public eventChangedOccurs when the Freezable or an object it contains is modified. (Inherited from Freezable.)
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  NameDescription
Public fieldStatic memberAngleXPropertyIdentifies the AngleX dependency property.
Public fieldStatic memberAngleYPropertyIdentifies the AngleY dependency property.
Public fieldStatic memberCenterXPropertyIdentifies the CenterX dependency property.
Public fieldStatic memberCenterYPropertyIdentifies the CenterY dependency property.
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  NameDescription
Explicit interface implemetationPrivate methodIFormattable.ToStringFormats the value of the current instance using the specified format. (Inherited from GeneralTransform.)
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A SkewTransform is useful for creating the illusion of 3-dimensional depth in a 2-D object.

Freezable Features: Because it inherits from the Freezable class, the SkewTransform class provides several special features: SkewTransform objects can be declared as resources, shared among multiple objects, made read-only to improve performance, cloned, and made thread-safe. For more information about the different features provided by Freezable objects, see Freezable Objects Overview.

This example shows how to use a SkewTransform to skew an element. A skew, which is also known as a shear, is a transformation that stretches the coordinate space in a non-uniform manner. One typical use of a SkewTransform is for simulating 3-D depth in 2-D objects.

Use the CenterX and CenterY properties to specify the center point of the SkewTransform.

Use the AngleX and AngleY properties to specify the skew angle of the x-axis and y-axis, and to skew the current coordinate system along these axes.

To predict the effect of a skew transformation, consider that AngleX skews x-axis values relative to the original coordinate system. Therefore, for an AngleX of 30, the y-axis rotates 30 degrees through the origin and skews the values in x- by 30 degrees from that origin. Likewise, an AngleY of 30 skews the y- values of the shape by 30 degrees from the origin. Note that this is not the same effect as translating (moving) the coordinate system by 30 degrees in x- or y-.

The following example applies a horizontal skew of 45 degrees to a Rectangle from a center point of (0,0).


<Rectangle 
  Height="50" Width="50" Fill="#CCCCCCFF" 
  Stroke="Blue" StrokeThickness="2"
  Canvas.Left="100" Canvas.Top="100">
  <Rectangle.RenderTransform>

     <!-- Applies a horizontal skew of 45 degrees 
          from a center point of (0,0). -->             
    <SkewTransform CenterX="0" CenterY="0" AngleX="45" AngleY="0" />
  </Rectangle.RenderTransform>
</Rectangle>


The following example applies a horizontal skew of 45 degrees to a Rectangle from a center point of (25,25).


<Rectangle Height="50" Width="50" Fill="#CCCCCCFF"
  Canvas.Left="100" Canvas.Top="100" 
  Stroke="Blue" StrokeThickness="2">
  <Rectangle.RenderTransform>

     <!-- Applies a horizontal skew of 45 degrees 
          from a center point of (25,25). -->  
    <SkewTransform CenterX="25" CenterY="25" AngleX="45" AngleY="0" />
  </Rectangle.RenderTransform>
</Rectangle>


The following example applies a vertical skew of 45 degrees to a Rectangle from a center point of (25,25).


<Rectangle Height="50" Width="50" Fill="#CCCCCCFF" 
  Stroke="Blue" StrokeThickness="2"
  Canvas.Left="100" Canvas.Top="100">
  <Rectangle.RenderTransform>

     <!-- Applies a vertical skew of 45 degrees 
          from a center point of (25,25). -->             
    <SkewTransform CenterX="25" CenterY="25" AngleX="0" AngleY="45" />
  </Rectangle.RenderTransform>
</Rectangle> 


The following illustration shows the different skews that are used in this example.

The three SkewTransform examples illustrated

SkewTransform examples

For the complete sample, see 2-D Transforms Sample.

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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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