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ArcSegment.ArcSegment() Constructor

Initializes a new instance of the ArcSegment class.

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

public ArcSegment ()
public ArcSegment ()
public function ArcSegment ()
You cannot use constructors in XAML.

The ArcSegment class defines only the destination point of the arc it represents; the beginning point of the arc is the current point of the PathFigure, to which the ArcSegment is added.

For most elliptical arcs of a particular position, size, and rotation, there are four different arcs that can be drawn; the largeArc and sweepDirection parameters indicate which arc to use.

Of the four candidate arc sweeps, two represent large arcs with sweeps of 180 degrees or greater, and two represent smaller arcs with sweeps 180 degrees or less. If largeArc is true, then one of the two larger arc sweeps is chosen; otherwise, if largeArc is false, one of the smaller arc sweeps is chosen.

If sweepDirection is Clockwise, the arc is drawn in a positive-angle direction. If sweepDirection is CounterClockwise, the arc is drawn in a negative-angle direction.

This example shows how to draw an elliptical arc. To create an elliptical arc, use the PathGeometry, PathFigure, and ArcSegment classes.

In the following examples, an elliptical arc is drawn from (10,100) to (200,100). The arc has a Size of 100 by 50 device-independent pixels, a RotationAngle of 45 degrees, an IsLargeArc setting of true, and a SweepDirection of Counterclockwise.

In Extensible Application Markup Language (XAML), you can use attribute syntax to describe a path.

<Path Stroke="Black" StrokeThickness="1"  
  Data="M 10,100 A 100,50 45 1 0 200,100" />

(Note that this attribute syntax actually creates a StreamGeometry, a lighter-weight version of a PathGeometry. For more information, see the Path Markup Syntax page.)

In XAML, you can also draw an elliptical arc by explicitly using object tags. The following is equivalent to the preceding XAML markup.

<Path Stroke="Black" StrokeThickness="1">
  <Path.Data>
    <PathGeometry>
      <PathGeometry.Figures>
        <PathFigureCollection>
          <PathFigure StartPoint="10,100">
            <PathFigure.Segments>
              <PathSegmentCollection>
                <ArcSegment Size="100,50" RotationAngle="45" IsLargeArc="True" SweepDirection="CounterClockwise" Point="200,100" />
              </PathSegmentCollection>
            </PathFigure.Segments>
          </PathFigure>
        </PathFigureCollection>
      </PathGeometry.Figures>
    </PathGeometry>
  </Path.Data>
</Path>

This example is part of a larger sample. For the complete sample, see the Geometries Sample.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0
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