Stroke.DrawCore(DrawingContext, DrawingAttributes) Método

Definição

Namespace:

System.Windows.Ink

Assembly:

PresentationCore.dll

Renderiza o Stroke no DrawingContext especificado usando o DrawingAttributes especificado.

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)

Parâmetros

drawingContext

DrawingContext

O objeto DrawingContext no qual o traço será renderizado.

drawingAttributes

DrawingAttributes

O objeto DrawingAttributes que define os atributos do traço que é desenhado.

Exemplos

O exemplo a seguir demonstra como desenhar um círculo em cada StylusPoint um de um Stroke. Se a FitToCurve propriedade estiver definida como true, ela GetBezierStylusPoints será usada para obter os pontos de caneta. Caso contrário, a StylusPoints propriedade será usada.

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

Comentários

Substitua o DrawCore método para executar o desenho personalizado quando você herdar da Stroke classe.