DrawingVisual Constructor

Definition

Namespace:

System.Windows.Media

Assembly:

PresentationCore.dll

Initializes a new instance of the DrawingVisual class.

public:
 DrawingVisual();

public DrawingVisual ();

Public Sub New ()

Examples

In the following example, a DrawingVisual object is created, and a rectangle is drawn into its drawing context. Notice that you must call the Close method of the DrawingContext to persist drawing content.

// Create a DrawingVisual that contains a rectangle.
private DrawingVisual CreateDrawingVisualRectangle()
{
    DrawingVisual drawingVisual = new DrawingVisual();

    // Retrieve the DrawingContext in order to create new drawing content.
    DrawingContext drawingContext = drawingVisual.RenderOpen();

    // Create a rectangle and draw it in the DrawingContext.
    Rect rect = new Rect(new System.Windows.Point(160, 100), new System.Windows.Size(320, 80));
    drawingContext.DrawRectangle(System.Windows.Media.Brushes.LightBlue, (System.Windows.Media.Pen)null, rect);

    // Persist the drawing content.
    drawingContext.Close();

    return drawingVisual;
}

' Create a DrawingVisual that contains a rectangle.
Private Function CreateDrawingVisualRectangle() As DrawingVisual
    Dim drawingVisual As New DrawingVisual()

    ' Retrieve the DrawingContext in order to create new drawing content.
    Dim drawingContext As DrawingContext = drawingVisual.RenderOpen()

    ' Create a rectangle and draw it in the DrawingContext.
    Dim rect As New Rect(New Point(160, 100), New Size(320, 80))
    drawingContext.DrawRectangle(Brushes.LightBlue, CType(Nothing, Pen), rect)

    ' Persist the drawing content.
    drawingContext.Close()

    Return drawingVisual
End Function

Remarks

When you create a DrawingVisual object, it has no drawing content. You can add text, graphic, or image content by retrieving the drawing context of the object and drawing into it. A drawing context is returned by calling the RenderOpen method of a DrawingVisual object.