Статья
11/18/2011

EllipseGeometry Class

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Represents the geometry of a circle or ellipse.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.Geometry
      System.Windows.Media.EllipseGeometry

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

Syntax

'Declaration
Public NotInheritable Class EllipseGeometry _
    Inherits Geometry

public sealed class EllipseGeometry : Geometry

<EllipseGeometry .../>

The EllipseGeometry type exposes the following members.

Constructors

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

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Properties

	Name	Description
	Bounds	Gets a Rect that specifies the axis-aligned bounding box of the Geometry. (Inherited from Geometry.)
	Center	Gets or sets the center point of the EllipseGeometry.
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	RadiusX	Gets or sets the x-radius value of the EllipseGeometry.
	RadiusY	Gets or sets the y-radius value of the EllipseGeometry.
	Transform	Gets or sets the Transform object applied to a Geometry. (Inherited from Geometry.)

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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.)

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Fields

	Name	Description
	CenterProperty	Identifies the Center dependency property.
	RadiusXProperty	Identifies the RadiusX dependency property.
	RadiusYProperty	Identifies the RadiusY dependency property.

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Remarks

Geometries can be used individually or in combination to declare the data for a Path. For details on the relationship between Path and geometries, see Geometries.

FillRule is technically a property inherited from the base Geometryclass, but setting it has no effect on an EllipseGeometry.

EllipseGeometry Compared to Ellipse

The Ellipse class has a Fill, Stroke, and other rendering properties that EllipseGeometry lacks.

The EllipseGeometry class simply defines the geometry of an ellipse, and cannot render itself. Because of its simplicity, it has a wider range of uses.

Examples

The following example shows how to create an ellipse using EllipseGeometry.

<Canvas>
  <Path Fill="Gold" Stroke="Black" StrokeThickness="1">
    <Path.Data>
      <EllipseGeometry Center="50,50" RadiusX="50" RadiusY="50" />
    </Path.Data>
  </Path>
</Canvas>

The following illustration shows the output from the example.

An EllipseGeometry drawn at (50,50)

Yellow Circle.

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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