Artigo
11/17/2011

PolyBezierSegment Class

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

Represents one or more cubic Bezier curves.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.PathSegment
      System.Windows.Media.PolyBezierSegment

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

Syntax

'Declaration
<ContentPropertyAttribute("Points", True)> _
Public NotInheritable Class PolyBezierSegment _
    Inherits PathSegment

[ContentPropertyAttribute("Points", true)]
public sealed class PolyBezierSegment : PathSegment

<PolyBezierSegment .../>

The PolyBezierSegment type exposes the following members.

Constructors

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

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Properties

	Name	Description
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	Points	Gets or sets the PointCollection that defines this PolyBezierSegment object.

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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
	PointsProperty	Identifies the Points dependency property.

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Remarks

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

A cubic Bezier curve is defined by four points: a start point, an end point, and two control points. A PolyBezierSegment specifies one or more cubic Bezier curves by setting the Points property to a collection of points. For every three points in the collection, the first and second points specify the two control points of the curve, and the third point specifies the end point. Note that no start point for the curve is specified because the start point is the same as the end point of the last segment. If in fact you are specifying exactly three points (one Bezier curve) you could instead use BezierSegment, specifying the three point values as Point1, Point2, and Point3.

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 affects the beginning portion of the curve; the second control point affects the ending portion of the curve. Note that the curve does not necessarily pass through either of the control points; each control point moves its portion of the line toward itself, but not through itself.

PolyBezierSegment can have an essentially unlimited number of control points, with the values of these points and the end point given as the Points property value.

Examples

The following example shows how to use a PolyBezierSegment to create a series of curves.

Run this sample

<Canvas Width="500" Height="100">
  <Path Stroke="Black" StrokeThickness="1">
    <Path.Data>
      <PathGeometry>
        <PathGeometry.Figures>
          <PathFigureCollection>

            <!-- The StartPoint specifies the starting point of the first curve. -->
            <PathFigure StartPoint="10,100">
              <PathFigure.Segments>
                <PathSegmentCollection>

                  <!-- The PolyBezierSegment specifies two cubic Bezier curves.
                   The first curve is from 10,100 (start point specified above)
                   to 300,100 with a control point of 0,0 and another control
                   point of 200,0. The second curve is from 300,100 
                   (end of the last curve) to 600,100 with a control point of 300,0
                   and another control point of 400,0. -->
                  <PolyBezierSegment Points="0,0 200,0 300,100 300,0 400,0 600,100" />
                </PathSegmentCollection>
              </PathFigure.Segments>
            </PathFigure>
          </PathFigureCollection>
        </PathGeometry.Figures>
      </PathGeometry>
    </Path.Data>
  </Path>
</Canvas>

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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