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Geometry Class

Classes that derive from this abstract base class define geometric shapes. Geometry objects can be used for clipping, hit-testing, and rendering 2-D graphic data.

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

[LocalizabilityAttribute(LocalizationCategory.None, Readability=Readability.Unreadable)] 
public abstract class Geometry : Animatable, IFormattable
/** @attribute LocalizabilityAttribute(LocalizationCategory.None, Readability=Readability.Unreadable) */ 
/** @attribute TypeConverterAttribute(System.Windows.Media.GeometryConverter) */ 
public abstract class Geometry extends Animatable implements IFormattable
LocalizabilityAttribute(LocalizationCategory.None, Readability=Readability.Unreadable) 
public abstract class Geometry extends Animatable implements IFormattable
This class is abstract; see Inheritance Hierarchy for derived non-abstract classes usable in XAML.

Geometry Compared to Shape

The System.Windows.Shapes.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 of a shape, and cannot render itself. Because of its simplicity, it has a wider range of uses.

Freezable Features: Because it inherits from the Freezable class, the Geometry class provides several special features: Geometry objects can be declared as resources, shared among multiple objects, made read-only to improve performance, cloned, and made thread-safe. For more information about the different features provided by Freezable objects, see the Freezable Objects Overview.

Notes to Inheritors: Although this class is abstract, it is not publicly extensible.

This example shows how to create composite shapes using Geometry objects and display them using a Path element. In the following example, a LineGeometry, EllipseGeometry, and a RectangleGeometry are used with a GeometryGroup to create a composite shape. The geometries are then drawn using a Path element.

<!-- Displays the 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" />

// Create a Path to be drawn to the screen.
Path myPath = new Path();
myPath.Stroke = Brushes.Black;
myPath.StrokeThickness = 1;
SolidColorBrush mySolidColorBrush = new SolidColorBrush();
mySolidColorBrush.Color = Color.FromArgb(255, 204, 204, 255);
myPath.Fill = mySolidColorBrush;

// Create the line geometry to add to the Path
LineGeometry myLineGeometry = new LineGeometry();
myLineGeometry.StartPoint = new Point(10, 10);
myLineGeometry.EndPoint = new Point(50, 30);

// Create the ellipse geometry to add to the Path
EllipseGeometry myEllipseGeometry = new EllipseGeometry();
myEllipseGeometry.Center = new Point(40, 70);
myEllipseGeometry.RadiusX = 30;
myEllipseGeometry.RadiusY = 30;

// Create a rectangle geometry to add to the Path
RectangleGeometry myRectGeometry = new RectangleGeometry();
myRectGeometry.Rect = new Rect(30, 55, 100, 30);

// Add all the geometries to a GeometryGroup.
GeometryGroup myGeometryGroup = new GeometryGroup();

myPath.Data = myGeometryGroup;

// Add path shape to the UI.
StackPanel mainPanel = new StackPanel();
this.Content = mainPanel;

The following illustration shows the shape created in the previous example.

Composite Geometry

A composite geometry created using a GeometryGroup

More complex shapes, such as polygons and shapes with curved segments, may be created using a PathGeometry. For an example showing how to create a shape using a PathGeometry, see Create a Shape Using a PathGeometry. Although this example renders a shape to the screen using a Path element, Geometry objects may also be used to describe the contents of a GeometryDrawing or a DrawingContext. They may also be used for clipping and hit-testing.

This example is part of larger sample; for the complete sample, see the Geometries Sample.

More Code

How to: Create a Shape by Using a PathGeometry

This example shows how to create a shape using the PathGeometry class. PathGeometry objects are composed of one or more PathFigure objects; each PathFigure represents a different "figure" or shape. Each PathFigure is itself composed of one or more PathSegment objects, each representing a connected portion of the figure or shape. Segment types include LineSegment, ArcSegment, and BezierSegment.

How to: Animate an EllipseGeometry

This example shows how to animate a Geometry within a Path element. In the following example, a PointAnimation is used to animate the Center of an EllipseGeometry.

             Derived Classes

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0
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