Geometry Geometry Geometry Class

Provides a base class for objects that define geometric shapes. Geometry objects can be used for clipping regions and as geometry definitions for rendering two-dimensional graphical data as a Path.

Syntax

Declaration

public class Geometrypublic class GeometryPublic Class Geometry

Inheritance Hierarchy

Remarks

For properties that take a Geometry, you need to specify a nonabstract derived type of Geometry, as an object element for XAML, or as a defined instance for code. For details, see reference pages for EllipseGeometry, GeometryGroup, LineGeometry, PathGeometry, or RectangleGeometry.

Geometries can be conceptualized as being "simple" or "complex". EllipseGeometry, LineGeometry, and RectangleGeometry are the simple geometries, which specify the geometrical shape as one element with basic coordinate or dimension properties. GeometryGroup and PathGeometry are the complex geometries. GeometryGroup combines other geometries that it holds as child objects. PathGeometry uses either a set of nested figure/segment path definition elements, or a compact string syntax that's usually output by designers, to describe a complex path for the geometry.

A Geometry does not entirely define its own rendering, in that it's not a UIElement itself and needs to be provided as some property value for a UIElement in order to cause a rendering effect. Typically, a Geometry is provided as data for a Path (which is a kind of Shape ).

The Data property takes a Geometry. In practice, you'd typically specify a PathGeometry for this, with its Figures property value expressed in the compact string syntax for a path.

GeometryCollection is a strongly typed collection for Geometry items. The Children property uses a GeometryCollection.

Geometry versus Shape

The Shape class has a Fill, Stroke, and other rendering properties that Geometry and its derived classes lack. The Shape class is a FrameworkElement and therefore participates in the layout system; its derived classes can be used as the content of any element that supports UIElement children. The Geometry class, on the other hand, simply defines the geometry as a graphics primitive, and cannot render itself. You could conceivably use Geometry as a property type for custom UI element properties where the basic graphics primitive expressions enabled by Geometry are useful as a definition.

Geometry for UIElement.Clip

To provide a value for the Clip property in the Windows Runtime, you must specifically use a RectangleGeometry, not any Geometry derived type. If you're porting XAML or code from other XAML frameworks, see if you can change your Clip to use RectangleGeometry. Otherwise, you might need to change the Z-order relationship and use techniques such as an overlay of an ImageBrush with a modified RenderTargetBitmap source that has alpha transparency for the "clipping" parts.

Geometry derived classes

Geometry is the parent class for several derived classes that define different categories of practical geometries:

Properties summary

Gets a Rect that specifies the axis-aligned bounding box of the Geometry.

Gets an empty geometry object.

Gets the standard tolerance used for polygonal approximation.

Gets or sets the Transform object applied to a Geometry.

Identifies the Transform dependency property.

Properties

  • Bounds
    Bounds
    Bounds
    Bounds

    Gets a Rect that specifies the axis-aligned bounding box of the Geometry.

    public Rect Bounds { get; }public Rect Bounds { get; }Public ReadOnly Property Bounds As Rectpublic Rect Bounds { get; }

    Property Value

  • Empty
    Empty
    Empty
    Empty

    Gets an empty geometry object.

    public static Geometry Empty { get; }public static Geometry Empty { get; }Public Static ReadOnly Property Empty As Geometrypublic static Geometry Empty { get; }

    Property Value

  • StandardFlatteningTolerance
    StandardFlatteningTolerance
    StandardFlatteningTolerance
    StandardFlatteningTolerance

    Gets the standard tolerance used for polygonal approximation.

    public static double StandardFlatteningTolerance { get; }public static double StandardFlatteningTolerance { get; }Public Static ReadOnly Property StandardFlatteningTolerance As doublepublic static double StandardFlatteningTolerance { get; }

    Property Value

    • double
      double
      double

      The standard tolerance. The default value is 0.25.

  • Transform
    Transform
    Transform
    Transform

    Gets or sets the Transform object applied to a Geometry.

    public Transform Transform { get; set; }public Transform Transform { get; set; }Public ReadWrite Property Transform As Transformpublic Transform Transform { get; set; }
    <geometry>
      <geometry.Transform>
        singleTransform
      </geometry.Transform
    </geometry>
    

    Property Value

  • TransformProperty
    TransformProperty
    TransformProperty
    TransformProperty

    Identifies the Transform dependency property.

    public static DependencyProperty TransformProperty { get; }public static DependencyProperty TransformProperty { get; }Public Static ReadOnly Property TransformProperty As DependencyPropertypublic static DependencyProperty TransformProperty { get; }

    Property Value

Device family

Windows 10 (introduced v10.0.10240.0)

API contract

Windows.Foundation.UniversalApiContract (introduced v1)

Attributes

Windows.Foundation.Metadata.ComposableAttribute
Windows.Foundation.Metadata.ContractVersionAttribute
Windows.Foundation.Metadata.MarshalingBehaviorAttribute
Windows.Foundation.Metadata.StaticAttribute
Windows.Foundation.Metadata.ThreadingAttribute
Windows.Foundation.Metadata.WebHostHiddenAttribute

Details

Assembly

Windows.UI.Xaml.Media.dll