Статья
11/18/2011

GeometryGroup Class

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

Represents a composite geometry, composed of other Geometry objects.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.Geometry
      System.Windows.Media.GeometryGroup

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

Syntax

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

[ContentPropertyAttribute("Children", true)]
public sealed class GeometryGroup : Geometry

<GeometryGroup>
  oneOrMoreGeometries
</GeometryGroup>

XAML Values

oneOrMoreGeometries
One or more object elements that derive from Geometry. Typically, these are any combination of the Silverlight defined classes EllipseGeometry, GeometryGroup, LineGeometry, PathGeometry, and RectangleGeometry. Object elements defined here become members of the Children collection when code accesses the Children property at run time.

The GeometryGroup type exposes the following members.

Constructors

	Name	Description
	GeometryGroup	Initializes a new instance of the GeometryGroup 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.)
	Children	Gets or sets the GeometryCollection that contains the objects that define this GeometryGroup.
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	FillRule	Gets or sets how the intersecting areas of the objects contained in this GeometryGroup are combined.
	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
	ChildrenProperty	Identifies the Children dependency property.
	FillRuleProperty	Identifies the FillRule dependency property.

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Remarks

FillRule is relevant for a GeometryGroup because the combined geometry can potentially have segment combinations where the application of a fill rule will have an effect.

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

Examples

Composite geometry objects can be created using a GeometryGroup. The GeometryGroup object creates an amalgamation of the Geometry objects it contains without combining their area. Any number of Geometry objects can be added to a GeometryGroup. The following example uses a GeometryGroup to create a composite geometry.

<Canvas>
  <Path Stroke="Black" StrokeThickness="1" Fill="#CCCCFF">
    <Path.Data>

      <!-- Creates a composite shape from three geometries. -->
      <GeometryGroup FillRule="EvenOdd">
        <LineGeometry StartPoint="10,10" EndPoint="50,30" />
        <EllipseGeometry Center="40,70" RadiusX="30" RadiusY="30" />
        <RectangleGeometry Rect="30,55 100 30" />
      </GeometryGroup>
    </Path.Data>
  </Path>
</Canvas>

The following illustration shows the output of the example.

A composite Geometry

Shapes.

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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