Stroke.DrawCore(DrawingContext, DrawingAttributes) Method

Reference

Definition

Namespace:: System.Windows.Ink

Assembly:: PresentationCore.dll

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Renders the Stroke on the specified DrawingContext using the specified DrawingAttributes.

protected:
 virtual void DrawCore(System::Windows::Media::DrawingContext ^ drawingContext, System::Windows::Ink::DrawingAttributes ^ drawingAttributes);

protected virtual void DrawCore (System.Windows.Media.DrawingContext drawingContext, System.Windows.Ink.DrawingAttributes drawingAttributes);

abstract member DrawCore : System.Windows.Media.DrawingContext * System.Windows.Ink.DrawingAttributes -> unit
override this.DrawCore : System.Windows.Media.DrawingContext * System.Windows.Ink.DrawingAttributes -> unit

Protected Overridable Sub DrawCore (drawingContext As DrawingContext, drawingAttributes As DrawingAttributes)

Parameters

drawingContext: DrawingContext

The DrawingContext object onto which the stroke will be rendered.

drawingAttributes: DrawingAttributes

The DrawingAttributes object defining the attributes of the stroke that is drawn.

Examples

The following example demonstrates how to draw a circle at each StylusPoint of a Stroke. If the FitToCurve property is set to true, the GetBezierStylusPoints is used to get the stylus points. Otherwise, the StylusPoints property is used.

protected override void DrawCore(DrawingContext context, DrawingAttributes overrides)
{
    // Draw the stroke. Calling base.DrawCore accomplishes the same thing.
    Geometry geometry = GetGeometry(overrides);
    context.DrawGeometry(new SolidColorBrush(overrides.Color), null, geometry);

    StylusPointCollection points;

    // Get the stylus points used to draw the stroke.  The points used depends on
    // the value of FitToCurve.
    if (this.DrawingAttributes.FitToCurve)
    {
        points = this.GetBezierStylusPoints();
    }
    else
    {
        points = this.StylusPoints;
    }

    // Draw a circle at each stylus point.
    foreach (StylusPoint p in points)
    {
        context.DrawEllipse(null, new Pen(Brushes.Black, 1), (Point)p, 5, 5);
    }
}

Protected Overrides Sub DrawCore(ByVal context As DrawingContext, _
        ByVal overridedAttributes As DrawingAttributes)

    ' Draw the stroke. Calling base.DrawCore accomplishes the same thing.
    Dim geometry As Geometry = GetGeometry(overridedAttributes)
    context.DrawGeometry(New SolidColorBrush(overridedAttributes.Color), Nothing, geometry)

    Dim points As StylusPointCollection

    ' Get the stylus points used to draw the stroke.  The points used depends on
    ' the value of FitToCurve.
    If Me.DrawingAttributes.FitToCurve Then
        points = Me.GetBezierStylusPoints()
    Else
        points = Me.StylusPoints
    End If

    ' Draw a circle at each stylus point.
    Dim p As StylusPoint
    For Each p In points
        context.DrawEllipse(Nothing, New Pen(Brushes.Black, 1), CType(p, Point), 5, 5)
    Next p

End Sub

Remarks

Override the DrawCore method to perform custom drawing when you inherit from the Stroke class.

Applies to