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Drawing Class

Abstract class that describes a 2-D drawing. This class cannot be inherited by your code.

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

[<AbstractClass>]
[<LocalizabilityAttribute(LocalizationCategory.None, Readability = Readability.Unreadable)>]
type Drawing =  
    class
        inherit Animatable
    end

The Drawing type exposes the following members.

  NameDescription
Public propertyBounds Gets the axis-aligned bounds of the drawing's contents.
Public propertyCanFreezeGets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)
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 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.)
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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 clone of this Drawing, making deep copies of this object's values. When copying dependency properties, this method copies resource references and data bindings (but they might no longer resolve) but not animations or their current 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 clone of this Drawing object, making deep copies of this object's current values. Resource references, data bindings, and animations are not copied, but their current values are.
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 methodToStringReturns a string that represents the current object. (Inherited from Object.)
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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Drawing objects are light-weight objects that enable you to add geometric shapes, images, text, and media to an application. Drawing objects are considered light-weight because they do not provide support for Layout System, Input Overview, and focus. Because of their performance benefits, drawings are ideal for backgrounds and clip art. You also use drawings when programming at the Visual level.

Because they inherit from the Freezable class, Drawing objects provide additional features that make them useful for describing clip art and backgrounds: they can be declared as resources, shared among multiple objects, made read-only, and made thread-safe. For more information about the different features provided by Freezable objects, see the Freezable Objects Overview.

There are different types of Drawing objects for different types of content: GeometryDrawing, ImageDrawing, DrawingGroup, VideoDrawing, and GlyphRunDrawing.

Freezable Features

A Drawing is a type of Freezable object. For information about Freezable features, such as freezing and cloning, see the Freezable Objects Overview.

This example shows how to paint an area with a drawing. To paint an area with a drawing, you use a DrawingBrush and one or more Drawing objects. The following example uses a DrawingBrush to paint an object with a drawing of two ellipses.


<!-- Demonstrates the use of DrawingBrush. -->
<Page  
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Background="White">
  <StackPanel Margin="20">

    <Rectangle Width="150" Height="150" Stroke="Black" StrokeThickness="1">
      <Rectangle.Fill>
        <DrawingBrush>
          <DrawingBrush.Drawing>
            <GeometryDrawing Brush="MediumBlue">
              <GeometryDrawing.Geometry>
                <GeometryGroup>
                  <EllipseGeometry RadiusX="20" RadiusY="45" Center="50,50" />
                  <EllipseGeometry RadiusX="45" RadiusY="20" Center="50,50" />
                </GeometryGroup>
              </GeometryDrawing.Geometry>
              <GeometryDrawing.Pen>
                <Pen Thickness="10">
                  <Pen.Brush>
                    <LinearGradientBrush>
                      <GradientStop Offset="0.0" Color="Black" />
                      <GradientStop Offset="1.0" Color="Gray" />
                    </LinearGradientBrush>
                  </Pen.Brush>
                </Pen>
              </GeometryDrawing.Pen>
            </GeometryDrawing>
          </DrawingBrush.Drawing>
        </DrawingBrush>
      </Rectangle.Fill>
    </Rectangle>
  </StackPanel>
</Page>


No code example is currently available or this language may not be supported.

The following illustration shows the example's output.

Output from a DrawingBrush

(The center of the shape is white for reasons described in How to: Control the Fill of a Composite Shape.)

By setting a DrawingBrush object's Viewport and TileMode properties, you can create a repeating pattern. The following example paints an object with a pattern created from a drawing of two ellipses.


<!-- Demonstrates the use of DrawingBrush. -->
<Page  
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Background="White">
  <StackPanel Margin="20">

    <Rectangle Width="150" Height="150" Stroke="Black" StrokeThickness="1">
      <Rectangle.Fill>
        <DrawingBrush Viewport="0,0,0.25,0.25" TileMode="Tile">
          <DrawingBrush.Drawing>
            <GeometryDrawing Brush="MediumBlue">
              <GeometryDrawing.Geometry>
                <GeometryGroup>
                  <EllipseGeometry RadiusX="20" RadiusY="45" Center="50,50" />
                  <EllipseGeometry RadiusX="45" RadiusY="20" Center="50,50" />
                </GeometryGroup>
              </GeometryDrawing.Geometry>
              <GeometryDrawing.Pen>
                <Pen Thickness="10">
                  <Pen.Brush>
                    <LinearGradientBrush>
                      <GradientStop Offset="0.0" Color="Black" />
                      <GradientStop Offset="1.0" Color="Gray" />
                    </LinearGradientBrush>
                  </Pen.Brush>
                </Pen>
              </GeometryDrawing.Pen>
            </GeometryDrawing>
          </DrawingBrush.Drawing>
        </DrawingBrush>
      </Rectangle.Fill>
    </Rectangle>
  </StackPanel>
</Page>


No code example is currently available or this language may not be supported.

The following illustration shows the tiled DrawingBrush output.

Tiled output from a DrawingBrush

For more information about drawing brushes, see Painting with Images, Drawings, and Visuals. For more information about Drawing objects, see the Drawing Objects Overview.

More Code

How to: Use a Drawing as an Image SourceThis example shows how to use a Drawing as the Source for an Image control. To display a Drawing with an Image control, use a DrawingImage as the Image control's Source and set the DrawingImage object's DrawingImage.Drawing property to the drawing you want to display.

.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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