PushLayer(Rect) Method
Summary
Adds the specified layer to the surface so that it receives all subsequent drawing operations until PopLayer is called.
Syntax
public bool PushLayer(
Rect rect
)
Public Overloads Function PushLayer( _
ByVal rect As Rect _
) As Boolean
public:
bool PushLayer(
Rect rect
)
Parameters
rect
The content rectangle mask for the layer.
Return Value
If this method succeeds, it returns true. Otherwise, it returns false.
Example
using Leadtools.Windows.D2DRendering;
public void D2DSurfacePushLayerExample()
{
//Create a new instance of the D2DSurface object
D2DSurface d2dSurface = new D2DSurface();
//Set the surface Size
d2dSurface.SurfaceSize = new Size(1000, 1000);
//Pass an empty rect to redraw the entire surface
d2dSurface.BeginDraw(Rect.Empty);
//Save the surface drawing state
D2DDrawingState drawingState = d2dSurface.Save();
//Create an ellipse geometry
EllipseGeometry ellipse = new EllipseGeometry();
ellipse.Center = new Point(500, 500);
ellipse.RadiusX = 100;
ellipse.RadiusY = 100;
GeometryGroup geometryGroup = new GeometryGroup();
geometryGroup.Children.Add(ellipse);
//Push geometry to receive all subsequent drawing operations
d2dSurface.PushLayer(geometryGroup);
//Create a rect having the specified dimensions
Rect rect = new Rect(40, 40, 500, 200);
//Create a new instance of a brush from a new solid color brush
SolidColorBrush fill = new SolidColorBrush(Colors.Green);
//Clear the pushed Layer with the fill brush
d2dSurface.Clear(fill);
//Stop redirecting drawing operations to the layer
d2dSurface.PopLayer();
//Restore the surface drawing state
d2dSurface.Restore(drawingState);
//End the Draw operation and invalidate the surface
d2dSurface.EndDraw();
d2dSurface.Invalidate(Rect.Empty);
}
Imports Leadtools.Windows.D2DRendering
Public Sub D2DSurfacePushLayerExample()
'Create a new instance of a D2DSurface
Dim d2dSurface As D2DSurface = New D2DSurface()
'Set the surface Size
d2dSurface.SurfaceSize = New Size(1000, 1000)
'Pass an empty rectangle to redraw the whole surface
d2dSurface.BeginDraw(System.Windows.Rect.Empty)
'Save the surface drawing state
Dim drawingState As D2DDrawingState = d2dSurface.Save()
'Create an ellipse geometry
Dim ellipse As EllipseGeometry = New EllipseGeometry()
ellipse.Center = New Point(500, 500)
ellipse.RadiusX = 100
ellipse.RadiusY = 100
Dim geomeTryGroup As GeometryGroup = New GeometryGroup()
geomeTryGroup.Children.Add(ellipse)
'Push the geometry object to receive all subsequent drawing operations
d2dSurface.PushLayer(geomeTryGroup)
'Create a rectangle having the specified dimensions
Dim rect As Rect = New Rect(40, 40, 500, 200)
'Create a new instance of a brush from a new solid color brush
Dim fill As SolidColorBrush = New SolidColorBrush(Colors.Green)
'Clear the pushed Layer with the fill brush
d2dSurface.Clear(fill)
'Stop redirecting drawing operations to the layer
d2dSurface.PopLayer()
'Restore the surface drawing state
d2dSurface.Restore(drawingState)
'End the Draw operation and invalidate the surface
d2dSurface.EndDraw()
d2dSurface.Invalidate(System.Windows.Rect.Empty)
End Sub
