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  • Artykuł

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
Public methodSupported by Silverlight for Windows Phone BezierSegment Initializes a new instance of the BezierSegment class.

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Properties

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

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Methods

  Name Description
Public methodSupported by Silverlight for Windows Phone CheckAccess Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone ClearValue Clears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows Phone 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.)
Public methodSupported by Silverlight for Windows Phone 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.)
Public methodSupported by Silverlight for Windows Phone GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetType Gets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetValue Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Protected methodSupported by Silverlight for Windows Phone MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone ReadLocalValue Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone SetValue Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone ToString Returns a string that represents the current object. (Inherited from Object.)

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Fields

  Name Description
Public fieldStatic memberSupported by Silverlight for Windows Phone Point1Property Identifies the Point1 dependency property.
Public fieldStatic memberSupported by Silverlight for Windows Phone Point2Property Identifies the Point2 dependency property.
Public fieldStatic memberSupported by Silverlight for Windows Phone 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.