PolyBezierSegment Class
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Represents one or more cubic Bezier curves.
System.Windows::DependencyObject
System.Windows.Media::PathSegment
System.Windows.Media::PolyBezierSegment
Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.
The PolyBezierSegment type exposes the following members.
| 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. |
| 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 Windows Phone 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.) |
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.
The following example shows how to use a PolyBezierSegment to create a series of curves.
<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>