VisualTreeHelper.GetDrawing Method
Returns the drawing content of the specified Visual.
Assembly: PresentationCore (in PresentationCore.dll)
Parameters
- reference
- Type: System.Windows.Media.Visual
The Visual whose drawing content is returned.
Return Value
Type: System.Windows.Media.DrawingGroupThe drawing content of the Visual returned as a DrawingGroup type.
The following example shows how to retrieve the DrawingGroup from a visual object by using the GetDrawing method. A hit test is then performed on the geometry of each drawing in the DrawingGroup to determine which geometry was hit.
// Determine if a geometry within the visual was hit. static public void HitTestGeometryInVisual(Visual visual, Point pt) { // Retrieve the group of drawings for the visual. DrawingGroup drawingGroup = VisualTreeHelper.GetDrawing(visual); EnumDrawingGroup(drawingGroup, pt); } // Enumerate the drawings in the DrawingGroup. static public void EnumDrawingGroup(DrawingGroup drawingGroup, Point pt) { DrawingCollection drawingCollection = drawingGroup.Children; // Enumerate the drawings in the DrawingCollection. foreach (Drawing drawing in drawingCollection) { // If the drawing is a DrawingGroup, call the function recursively. if (drawing.GetType() == typeof(DrawingGroup)) { EnumDrawingGroup((DrawingGroup)drawing, pt); } else if (drawing.GetType() == typeof(GeometryDrawing)) { // Determine whether the hit test point falls within the geometry. if (((GeometryDrawing)drawing).Geometry.FillContains(pt)) { // Perform action based on hit test on geometry. } } } }
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
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
