Skip to main content
EllipseGeometry Class
 

Represents the geometry of a circle or ellipse.

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

Inheritance Hierarchy
SystemObject
   System.Windows.ThreadingDispatcherObject
     System.WindowsDependencyObject
       System.WindowsFreezable
         System.Windows.Media.AnimationAnimatable
           System.Windows.MediaGeometry
            System.Windows.MediaEllipseGeometry

Syntax
public sealed class EllipseGeometry : Geometry
public ref class EllipseGeometry sealed : Geometry
[<Sealed>]
type EllipseGeometry = 
    class
        inherit Geometry
    end
Public NotInheritable Class EllipseGeometry
	Inherits Geometry
Constructors
NameDescription
System_CAPS_pubmethod EllipseGeometry

Initializes a new instance of the EllipseGeometry class.

System_CAPS_pubmethod EllipseGeometry

Initializes a new instance of the EllipseGeometry class as an ellipse that has a specified center location, x radius, and y radius.

System_CAPS_pubmethod EllipseGeometry

Initializes a new instance of the EllipseGeometry class that has the specified position, size, and transformation.

System_CAPS_pubmethod EllipseGeometry

Initializes a new instance of the EllipseGeometry class that has a horizontal diameter equal to the width of the passed Rect, a vertical diameter equal to the length of the passed Rect, and a center point location equal to the center of the passed Rect.

Properties
NameDescription
System_CAPS_pubproperty

Gets a Rect that represents the bounding box of this EllipseGeometry. This method does not consider the extra area potentially added by a stroke. (Overrides .)

System_CAPS_pubproperty

Gets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)

System_CAPS_pubproperty

Gets or sets the center point of the EllipseGeometry.

System_CAPS_pubproperty

Gets the DependencyObjectType that wraps the CLR type of this instance. (Inherited from DependencyObject.)

System_CAPS_pubproperty

Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)

System_CAPS_pubproperty

Gets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties.(Inherited from Animatable.)

System_CAPS_pubproperty

Gets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.)

System_CAPS_pubproperty

Gets a value that indicates whether this instance is currently sealed (read-only).(Inherited from DependencyObject.)

System_CAPS_pubproperty

Gets or sets the x-radius value of the EllipseGeometry.

System_CAPS_pubproperty

Gets or sets the y-radius value of the EllipseGeometry.

System_CAPS_pubproperty

Gets or sets the Transform object applied to a Geometry. (Inherited from Geometry.)

Methods
NameDescription
System_CAPS_pubmethod ApplyAnimationClock

Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the SnapshotAndReplace handoff behavior is used.(Inherited from Animatable.)

System_CAPS_pubmethod ApplyAnimationClock

Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the specified HandoffBehavior is used.(Inherited from Animatable.)

System_CAPS_pubmethod BeginAnimation

Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the SnapshotAndReplace handoff behavior is used.(Inherited from Animatable.)

System_CAPS_pubmethod BeginAnimation

Applies an animation to the specified DependencyProperty. The animation is started when the next frame is rendered. If the specified property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable.)

System_CAPS_pubmethod CheckAccess

Determines whether the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.)

System_CAPS_pubmethod ClearValue

Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.)

System_CAPS_pubmethod ClearValue

Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.)

System_CAPS_pubmethod Clone

Creates a modifiable clone of this EllipseGeometry, making deep copies of this object's values. When copying dependency properties, this method copies resource references and data bindings (but they might no longer resolve) but not animations or their current values.

System_CAPS_pubmethod CloneCurrentValue

Creates a modifiable clone of this EllipseGeometry object, making deep copies of this object's current values. Resource references, data bindings, and animations are not copied, but their current values are.

System_CAPS_pubmethod CoerceValue

Coerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.(Inherited from DependencyObject.)

System_CAPS_pubmethod Equals

Determines whether a provided DependencyObject is equivalent to the current DependencyObject.(Inherited from DependencyObject.)

System_CAPS_pubmethod FillContains

Indicates whether the current geometry completely contains the specified Geometry.(Inherited from Geometry.)

System_CAPS_pubmethod FillContains

Indicates whether the current geometry contains the specified Geometry, given the specified margin of error.(Inherited from Geometry.)

System_CAPS_pubmethod FillContains

Indicates whether the geometry contains the specified Point.(Inherited from Geometry.)

System_CAPS_pubmethod FillContains

Indicates whether the geometry contains the specified Point, given the specified margin of error.(Inherited from Geometry.)

System_CAPS_pubmethod FillContainsWithDetail

Returns a value that describes the intersection between the current geometry and the specified geometry.(Inherited from Geometry.)

System_CAPS_pubmethod FillContainsWithDetail

Returns a value that describes the intersection between the current geometry and the specified geometry, given the specified margin of error.(Inherited from Geometry.)

System_CAPS_pubmethod Freeze

Makes the current object unmodifiable and sets its property to true. (Inherited from Freezable.)

System_CAPS_pubmethod GetAnimationBaseValue

Returns the non-animated value of the specified DependencyProperty.(Inherited from Animatable.)

System_CAPS_pubmethod GetArea

Gets the area of the filled region of the Geometry object. (Inherited from Geometry.)

System_CAPS_pubmethod GetArea

Gets the area of this EllipseGeometry. (Overrides GeometryGetArea.)

System_CAPS_pubmethod GetAsFrozen

Creates a frozen copy of the Freezable, using base (non-animated) property values. Because the copy is frozen, any frozen sub-objects are copied by reference. (Inherited from Freezable.)

System_CAPS_pubmethod GetCurrentValueAsFrozen

Creates a frozen copy of the Freezable using current property values. Because the copy is frozen, any frozen sub-objects are copied by reference.(Inherited from Freezable.)

System_CAPS_pubmethod GetFlattenedPathGeometry

Gets a PathGeometry that is a polygonal approximation of the Geometry object. (Inherited from Geometry.)

System_CAPS_pubmethod GetFlattenedPathGeometry

Gets a PathGeometry, within the specified tolerance, that is a polygonal approximation of the Geometry object. (Inherited from Geometry.)

System_CAPS_pubmethod GetHashCode

Gets a hash code for this DependencyObject.(Inherited from DependencyObject.)

System_CAPS_pubmethod GetLocalValueEnumerator

Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.)

System_CAPS_pubmethod GetOutlinedPathGeometry

Gets a PathGeometry that is a simplified outline of the filled region of the Geometry. (Inherited from Geometry.)

System_CAPS_pubmethod GetOutlinedPathGeometry

Gets a PathGeometry, within the specified tolerance, that is a simplified outline of the filled region of the Geometry. (Inherited from Geometry.)

System_CAPS_pubmethod GetRenderBounds

Returns an axis-aligned rectangle that is exactly large enough to contain the geometry after it has been outlined with the specified Pen. (Inherited from Geometry.)

System_CAPS_pubmethod GetRenderBounds

Returns an axis-aligned rectangle that is exactly large enough to contain the geometry after it has been outlined with the specified Pen, given the specified tolerance factor.(Inherited from Geometry.)

System_CAPS_pubmethod GetType

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_pubmethod GetValue

Returns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)

System_CAPS_pubmethod GetWidenedPathGeometry

Gets a PathGeometry that is the shape defined by the stroke on the Geometry produced by the specified Pen. (Inherited from Geometry.)

System_CAPS_pubmethod GetWidenedPathGeometry

Gets a PathGeometry that is the shape defined by the stroke on the Geometry produced by the specified Pen, given the specified tolerance factor.(Inherited from Geometry.)

System_CAPS_pubmethod InvalidateProperty

Re-evaluates the effective value for the specified dependency property(Inherited from DependencyObject.)

System_CAPS_pubmethod IsEmpty

Determines whether this EllipseGeometry object is empty. (Overrides GeometryIsEmpty.)

System_CAPS_pubmethod MayHaveCurves

Determines whether this EllipseGeometry object can have curved segments. (Overrides GeometryMayHaveCurves.)

System_CAPS_pubmethod ReadLocalValue

Returns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)

System_CAPS_pubmethod SetCurrentValue

Sets the value of a dependency property without changing its value source. (Inherited from DependencyObject.)

System_CAPS_pubmethod SetValue

Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.)

System_CAPS_pubmethod SetValue

Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.)

System_CAPS_protmethod ShouldSerializeProperty

Returns a value that indicates whether serialization processes should serialize the value for the provided dependency property.(Inherited from DependencyObject.)

System_CAPS_pubmethod ShouldSerializeTransform

Gets a value that indicates whether the value of the property should be serialized.(Inherited from Geometry.)

System_CAPS_pubmethod StrokeContains

Determines whether the specified Point is contained in the stroke produced by applying the specified Pen to the geometry. (Inherited from Geometry.)

System_CAPS_pubmethod StrokeContains

Determines whether the specified Point is contained in the stroke produced by applying the specified Pen to the geometry, given the specified margin of error.(Inherited from Geometry.)

System_CAPS_pubmethod StrokeContainsWithDetail

Returns a value that describes the intersection between the specified Geometry and the stroke created by applying the specified Pen to the current geometry.(Inherited from Geometry.)

System_CAPS_pubmethod StrokeContainsWithDetail

Gets a value that describes the intersection between the specified Geometry and the stroke created by applying the specified Pen to the current geometry, given the specified margin of error.(Inherited from Geometry.)

System_CAPS_pubmethod ToString

Creates a string representation of the object based on the current culture. (Inherited from Geometry.)

System_CAPS_pubmethod ToString

Creates a string representation of the object using the specified culture-specific formatting information. (Inherited from Geometry.)

System_CAPS_pubmethod VerifyAccess

Enforces that the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.)

Fields
NameDescription
System_CAPS_pubfield System_CAPS_static CenterProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static RadiusXProperty

Identifies the  dependency property.

System_CAPS_pubfield System_CAPS_static RadiusYProperty

Identifies the  dependency property.

Events
NameDescription
System_CAPS_pubevent Changed

Occurs when the Freezable or an object it contains is modified. (Inherited from Freezable.)

Explicit Interface Implementations
NameDescription
System_CAPS_pubinterface System_CAPS_privmethod IFormattableToString

Formats the value of the current instance using the specified format.(Inherited from Geometry.)

Remarks

Use the EllipseGeometry class with a Path element or a GeometryDrawing to draw an ellipse, or with the property of a UIElement to define an elliptical clip region. The EllipseGeometry class also has many other uses. For more information about EllipseGeometry, see Geometry Overview.

EllipseGeometry Compared to Ellipse

The Ellipse class has a , , and other rendering properties that EllipseGeometry lacks. The Ellipse class is a FrameworkElement and therefore participates in the layout system; it can be used as the content of any element that supports UIElement children.

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

Freezable Features

An EllipseGeometry is a type of Freezable object and therefore can be frozen to improve performance. For information about Freezable features, such as freezing and cloning, see Freezable Objects Overview.

Examples

The following example uses two EllipseGeometry objects to define the contents of a GeometryDrawing. This example produces the following output:

A GeometryDrawing of two ellipses

Two EllipseGeometry objects

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SDKSample
{
    public class GeometryDrawingExample : Page
    {
        public GeometryDrawingExample()
        {

            //
            // Create the Geometry to draw.
            //
            GeometryGroup ellipses = new GeometryGroup();
            ellipses.Children.Add(
                new EllipseGeometry(new Point(50,50), 45, 20)
                );
            ellipses.Children.Add(
                new EllipseGeometry(new Point(50, 50), 20, 45)
                );


            //
            // Create a GeometryDrawing.
            //
            GeometryDrawing aGeometryDrawing = new GeometryDrawing();
            aGeometryDrawing.Geometry = ellipses;

            // Paint the drawing with a gradient.
            aGeometryDrawing.Brush = 
                new LinearGradientBrush(
                    Colors.Blue, 
                    Color.FromRgb(204,204,255), 
                    new Point(0,0), 
                    new Point(1,1));

            // Outline the drawing with a solid color.
            aGeometryDrawing.Pen = new Pen(Brushes.Black, 10);

            //
            // Use a DrawingImage and an Image control
            // to display the drawing.
            //
            DrawingImage geometryImage = new DrawingImage(aGeometryDrawing);

            // Freeze the DrawingImage for performance benefits.
            geometryImage.Freeze();

            Image anImage = new Image();
            anImage.Source = geometryImage;
            anImage.Stretch = Stretch.None;
            anImage.HorizontalAlignment = HorizontalAlignment.Left;

            //
            // Place the image inside a border and
            // add it to the page.
            //
            Border exampleBorder = new Border();
            exampleBorder.Child = anImage;
            exampleBorder.BorderBrush = Brushes.Gray;
            exampleBorder.BorderThickness = new Thickness(1);
            exampleBorder.HorizontalAlignment = HorizontalAlignment.Left;
            exampleBorder.VerticalAlignment = VerticalAlignment.Top;
            exampleBorder.Margin = new Thickness(10);

            this.Margin = new Thickness(20);
            this.Background = Brushes.White;
            this.Content = exampleBorder;
        }

    }
}
<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:PresentationOptions="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options" 
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  mc:Ignorable="PresentationOptions"
  Margin="20" Background="White">

  <Border BorderBrush="Gray" BorderThickness="1" 
    HorizontalAlignment="Left" VerticalAlignment="Top"
    Margin="10">
    <Image Stretch="None" HorizontalAlignment="Left">
      <Image.Source>
        <DrawingImage PresentationOptions:Freeze="True">
          <DrawingImage.Drawing>

            <GeometryDrawing>
              <GeometryDrawing.Geometry>

                <!-- Create a composite shape. -->
                <GeometryGroup>
                  <EllipseGeometry Center="50,50" RadiusX="45" RadiusY="20" />
                  <EllipseGeometry Center="50,50" RadiusX="20" RadiusY="45" />
                </GeometryGroup>
              </GeometryDrawing.Geometry>
              <GeometryDrawing.Brush>

                <!-- Paint the drawing with a gradient. -->
                <LinearGradientBrush>
                  <GradientStop Offset="0.0" Color="Blue" />
                  <GradientStop Offset="1.0" Color="#CCCCFF" />
                </LinearGradientBrush>
              </GeometryDrawing.Brush>
              <GeometryDrawing.Pen>

                <!-- Outline the drawing with a solid color. -->
                <Pen Thickness="10" Brush="Black" />
              </GeometryDrawing.Pen>
            </GeometryDrawing>
          </DrawingImage.Drawing>
        </DrawingImage>
      </Image.Source>
    </Image>
  </Border>


</Page>
Version Information
.NET Framework
Available since 3.0
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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.

Return to top