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EllipseGeometry Class

Represents the geometry of a circle or ellipse.

Namespace:  System.Windows.Media
Assembly:  PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public sealed class EllipseGeometry : Geometry
<EllipseGeometry .../>

The EllipseGeometry type exposes the following members.

  NameDescription
Public methodEllipseGeometry()Initializes a new instance of the EllipseGeometry class.
Public methodEllipseGeometry(Rect)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.
Public methodEllipseGeometry(Point, Double, Double)Initializes a new instance of the EllipseGeometry class as an ellipse that has a specified center location, x radius, and y radius.
Public methodEllipseGeometry(Point, Double, Double, Transform)Initializes a new instance of the EllipseGeometry class that has the specified position, size, and transformation.
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  NameDescription
Public propertyBoundsGets a Rect that represents the bounding box of this EllipseGeometry. This method does not consider the extra area potentially added by a stroke. (Overrides Geometry.Bounds.)
Public propertyCanFreezeGets a value that indicates whether the object can be made unmodifiable. (Inherited from Freezable.)
Public propertyCenterGets or sets the center point of the EllipseGeometry.
Public propertyDependencyObjectTypeGets the DependencyObjectType that wraps the CLR type of this instance.  (Inherited from DependencyObject.)
Public propertyDispatcherGets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)
Public propertyHasAnimatedPropertiesGets a value that indicates whether one or more AnimationClock objects is associated with any of this object's dependency properties. (Inherited from Animatable.)
Public propertyIsFrozenGets a value that indicates whether the object is currently modifiable. (Inherited from Freezable.)
Public propertyIsSealedGets a value that indicates whether this instance is currently sealed (read-only). (Inherited from DependencyObject.)
Public propertyRadiusXGets or sets the x-radius value of the EllipseGeometry.
Public propertyRadiusYGets or sets the y-radius value of the EllipseGeometry.
Public propertyTransformGets or sets the Transform object applied to a Geometry. (Inherited from Geometry.)
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  NameDescription
Public methodApplyAnimationClock(DependencyProperty, AnimationClock)Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the SnapshotAndReplace handoff behavior is used. (Inherited from Animatable.)
Public methodApplyAnimationClock(DependencyProperty, AnimationClock, HandoffBehavior)Applies an AnimationClock to the specified DependencyProperty. If the property is already animated, the specified HandoffBehavior is used. (Inherited from Animatable.)
Public methodBeginAnimation(DependencyProperty, AnimationTimeline)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.)
Public methodBeginAnimation(DependencyProperty, AnimationTimeline, HandoffBehavior)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.)
Public methodCheckAccessDetermines whether the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
Public methodClearValue(DependencyProperty)Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier. (Inherited from DependencyObject.)
Public methodClearValue(DependencyPropertyKey)Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey. (Inherited from DependencyObject.)
Public methodCloneCreates 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.
Public methodCloneCurrentValueCreates 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.
Public methodCoerceValueCoerces 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.)
Public methodEqualsDetermines whether a provided DependencyObject is equivalent to the current DependencyObject. (Inherited from DependencyObject.)
Public methodFillContains(Geometry)Indicates whether the current geometry completely contains the specified Geometry. (Inherited from Geometry.)
Public methodFillContains(Point)Indicates whether the geometry contains the specified Point. (Inherited from Geometry.)
Public methodFillContains(Geometry, Double, ToleranceType)Indicates whether the current geometry contains the specified Geometry, given the specified margin of error. (Inherited from Geometry.)
Public methodFillContains(Point, Double, ToleranceType)Indicates whether the geometry contains the specified Point, given the specified margin of error. (Inherited from Geometry.)
Public methodFillContainsWithDetail(Geometry)Returns a value that describes the intersection between the current geometry and the specified geometry. (Inherited from Geometry.)
Public methodFillContainsWithDetail(Geometry, Double, ToleranceType)Returns a value that describes the intersection between the current geometry and the specified geometry, given the specified margin of error. (Inherited from Geometry.)
Public methodFreeze()Makes the current object unmodifiable and sets its IsFrozen property to true. (Inherited from Freezable.)
Public methodGetAnimationBaseValueReturns the non-animated value of the specified DependencyProperty. (Inherited from Animatable.)
Public methodGetArea()Gets the area of the filled region of the Geometry object. (Inherited from Geometry.)
Public methodGetArea(Double, ToleranceType)Gets the area of this EllipseGeometry. (Overrides Geometry.GetArea(Double, ToleranceType).)
Public methodGetAsFrozenCreates 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.)
Public methodGetCurrentValueAsFrozenCreates 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.)
Public methodGetFlattenedPathGeometry()Gets a PathGeometry that is a polygonal approximation of the Geometry object. (Inherited from Geometry.)
Public methodGetFlattenedPathGeometry(Double, ToleranceType)Gets a PathGeometry, within the specified tolerance, that is a polygonal approximation of the Geometry object. (Inherited from Geometry.)
Public methodGetHashCodeGets a hash code for this DependencyObject. (Inherited from DependencyObject.)
Public methodGetLocalValueEnumeratorCreates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject. (Inherited from DependencyObject.)
Public methodGetOutlinedPathGeometry()Gets a PathGeometry that is a simplified outline of the filled region of the Geometry. (Inherited from Geometry.)
Public methodGetOutlinedPathGeometry(Double, ToleranceType)Gets a PathGeometry, within the specified tolerance, that is a simplified outline of the filled region of the Geometry. (Inherited from Geometry.)
Public methodGetRenderBounds(Pen)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.)
Public methodGetRenderBounds(Pen, Double, ToleranceType)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.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property on this instance of a DependencyObject. (Inherited from DependencyObject.)
Public methodGetWidenedPathGeometry(Pen)Gets a PathGeometry that is the shape defined by the stroke on the Geometry produced by the specified Pen. (Inherited from Geometry.)
Public methodGetWidenedPathGeometry(Pen, Double, ToleranceType)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.)
Public methodInvalidatePropertyRe-evaluates the effective value for the specified dependency property (Inherited from DependencyObject.)
Public methodIsEmptyDetermines whether this EllipseGeometry object is empty. (Overrides Geometry.IsEmpty().)
Public methodMayHaveCurvesDetermines whether this EllipseGeometry object can have curved segments. (Overrides Geometry.MayHaveCurves().)
Public methodReadLocalValueReturns the local value of a dependency property, if it exists. (Inherited from DependencyObject.)
Public methodSetCurrentValueSets the value of a dependency property without changing its value source. (Inherited from DependencyObject.)
Public methodSetValue(DependencyProperty, Object)Sets the local value of a dependency property, specified by its dependency property identifier. (Inherited from DependencyObject.)
Public methodSetValue(DependencyPropertyKey, Object)Sets the local value of a read-only dependency property, specified by the DependencyPropertyKey identifier of the dependency property. (Inherited from DependencyObject.)
Protected methodShouldSerializePropertyReturns a value that indicates whether serialization processes should serialize the value for the provided dependency property. (Inherited from DependencyObject.)
Public methodShouldSerializeTransformGets a value that indicates whether the value of the Transform property should be serialized. (Inherited from Geometry.)
Public methodStrokeContains(Pen, Point)Determines whether the specified Point is contained in the stroke produced by applying the specified Pen to the geometry. (Inherited from Geometry.)
Public methodStrokeContains(Pen, Point, Double, ToleranceType)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.)
Public methodStrokeContainsWithDetail(Pen, Geometry)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.)
Public methodStrokeContainsWithDetail(Pen, Geometry, Double, ToleranceType)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.)
Public methodToString()Creates a string representation of the object based on the current culture. (Inherited from Geometry.)
Public methodToString(IFormatProvider)Creates a string representation of the object using the specified culture-specific formatting information. (Inherited from Geometry.)
Public methodVerifyAccessEnforces that the calling thread has access to this DispatcherObject. (Inherited from DispatcherObject.)
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  NameDescription
Public eventChangedOccurs when the Freezable or an object it contains is modified. (Inherited from Freezable.)
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  NameDescription
Public fieldStatic memberCenterPropertyIdentifies the Center dependency property.
Public fieldStatic memberRadiusXPropertyIdentifies the RadiusX dependency property.
Public fieldStatic memberRadiusYPropertyIdentifies the RadiusY dependency property.
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  NameDescription
Explicit interface implemetationPrivate methodIFormattable.ToStringFormats the value of the current instance using the specified format. (Inherited from Geometry.)
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Use the EllipseGeometry class with a Path element or a GeometryDrawing to draw an ellipse, or with the Clip 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 Fill, Stroke, 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.

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

Two EllipseGeometry objects

A GeometryDrawing of two ellipses
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>

More Code

How to: Create a Shape by Using a PathGeometryThis 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 EllipseGeometryThis 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.
How to: Animate a Point by Using Key FramesThis example shows how to use the PointAnimationUsingKeyFrames class to animate a Point.
How to: Create a Composite Shape 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.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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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