Artigo
11/18/2011

BezierSegment Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents a cubic Bezier curve drawn between two points.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.PathSegment
      System.Windows.Media.BezierSegment

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

Syntax

'Declaration
Public NotInheritable Class BezierSegment _
    Inherits PathSegment

public sealed class BezierSegment : PathSegment

<BezierSegment .../>

The BezierSegment type exposes the following members.

Constructors

	Name	Description
	BezierSegment	Initializes a new instance of the BezierSegment class.

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Properties

	Name	Description
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	Point1	Gets or sets the first control point of the curve.
	Point2	Gets or sets the second control point of the curve.
	Point3	Gets or sets the end point of the curve.

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Methods

	Name	Description
	CheckAccess	Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
	ClearValue	Clears the local value of a dependency property. (Inherited from DependencyObject.)
	Equals(Object)	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
	GetAnimationBaseValue	Returns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	GetValue	Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	ReadLocalValue	Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
	SetValue	Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Fields

	Name	Description
	Point1Property	Identifies the Point1 dependency property.
	Point2Property	Identifies the Point2 dependency property.
	Point3Property	Identifies the Point3 dependency property.

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Remarks

Use a PathFigure object to store BezierSegment objects and other segments.

A cubic Bezier curve is defined by four points: a start point, an end point (Point3), and two control points (Point1 and Point2). The BezierSegment class does not contain a property for the starting point of the curve; it only defines the end point. The beginning point of the curve is the current point of the PathFigure to which the BezierSegment is added.

The two control points of a cubic Bezier curve behave like magnets, attracting portions of what would otherwise be a straight line toward themselves and producing a curve. The first control point, Point1, affects the beginning portion of the curve; the second control point, Point2, affects the ending portion of the curve. Note that the curve doesn't necessarily pass through either of the control points; each control point moves its portion of the line toward itself, but not through itself.

To specify a Bezier type segment with more control points, see PolyBezierSegment.

Examples

The following example uses a BezierSegment as one of the PathSegment items in a PathGeometry.

<Canvas>
  <Path Stroke="Black" StrokeThickness="1" >
    <Path.Data>
      <PathGeometry>
        <PathGeometry.Figures>
          <PathFigure StartPoint="10,50">
            <PathFigure.Segments>
              <BezierSegment Point1="100,0"
                Point2="200,200"
                Point3="300,100"/>
              <LineSegment Point="400,100" />
              <ArcSegment Size="50,50" RotationAngle="45"
                IsLargeArc="True" SweepDirection="Clockwise"
                Point="200,100"/>
            </PathFigure.Segments>
          </PathFigure>
        </PathGeometry.Figures>
      </PathGeometry>
    </Path.Data>
  </Path>
</Canvas>

Rendered path from the example

Pathfigure

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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.

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