GeometryGroup Class
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GeometryGroup Class

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Represents a composite geometry, composed of other Geometry objects.

Namespace:  System.Windows.Media
Assembly:  System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.

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

XAML Values


One or more object elements that derive from Geometry. Typically, these are any combination of the Windows Phone 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.

Public methodGeometryGroupInitializes a new instance of the GeometryGroup class.

Public propertyBoundsGets a Rect that specifies the axis-aligned bounding box of the Geometry. (Inherited from Geometry.)
Public propertyChildrenGets or sets the GeometryCollection that contains the objects that define this GeometryGroup.
Public propertyDispatcherGets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
Public propertyFillRuleGets or sets how the intersecting areas of the objects contained in this GeometryGroup are combined.
Public propertyTransformGets or sets the Transform object applied to a Geometry. (Inherited from Geometry.)

Public methodCheckAccessDetermines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Public methodClearValueClears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetAnimationBaseValueReturns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodReadLocalValueReturns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodSetValueSets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Public fieldStatic memberChildrenPropertyIdentifies the Children dependency property.
Public fieldStatic memberFillRulePropertyIdentifies the FillRule dependency property.

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.

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.

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

      <!-- 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" />

The following illustration shows the output of the example.

A composite Geometry


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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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