BezierSegment Class

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.

Freezable Features

This example shows how to create a cubic Bezier curve. To create a cubic Bezier curve, use the PathGeometry, PathFigure, and BezierSegment classes. To display the resulting geometry, use a Path element, or use it with a GeometryDrawing or a DrawingContext. In the following examples, a cubic Bezier curve is drawn from (10, 100) to (300, 100). The curve has control points of (100, 0) and (200, 200).

[xaml]

In Extensible Application Markup Language (XAML), you may use abbreviated markup syntax to describe a path.

<Path Stroke="Black" StrokeThickness="1"  
  Data="M 10,100 C 100,0 200,200 300,100" />

[xaml]

In XAML, you can also draw a cubic Bezier curve using object tags. The following is equivalent to the previous XAML example.

<Path Stroke="Black" StrokeThickness="1">
  <Path.Data>
    <PathGeometry>
      <PathGeometry.Figures>
        <PathFigureCollection>
          <PathFigure StartPoint="10,100">
            <PathFigure.Segments>
              <PathSegmentCollection>
                <BezierSegment Point1="100,0" Point2="200,200" Point3="300,100" />
              </PathSegmentCollection>
            </PathFigure.Segments>
          </PathFigure>
        </PathFigureCollection>
      </PathGeometry.Figures>
    </PathGeometry>
  </Path.Data>
</Path>

This example is part of larger sample; for the complete sample, see the Geometries Sample.

More Code

.NET Framework

.NET Framework Client Profile

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

Other Resources