Generate BitmapSource from UIElement
- by Joel
I am attempting to generate a BitmapFrame that is based on a UIElement. Here is my function:
private BitmapFrame RenderToBitmap2()
{
RenderTargetBitmap renderBitmap = new RenderTargetBitmap(200, 200, 96, 96, PixelFormats.Pbgra32);
DrawingVisual drawingVisual = new DrawingVisual();
DrawingContext drawingContext = drawingVisual.RenderOpen();
VisualBrush aVisualBrush = new VisualBrush(GenerateTestStackPanel());
drawingContext.DrawRectangle(aVisualBrush, new Pen(Brushes.Green, 2), new Rect(new Size(150, 150)));
drawingContext.Close();
renderBitmap.Render(drawingVisual);
return BitmapFrame.Create(renderBitmap);
}
For testing and debugging purposes, I am using an additional function that creates a simple StackFrame that should create a valid visual element that can be represented:
private StackPanel GenerateTestStackPanel()
{
// Create a red Ellipse.
Ellipse myEllipse = new Ellipse();
myEllipse.Fill = Brushes.Green;
myEllipse.StrokeThickness = 2;
myEllipse.Stroke = Brushes.Black;
// Set the width and height of the Ellipse.
myEllipse.Width = 200;
myEllipse.Height = 200;
// Add the Ellipse to the StackPanel.
StackPanel myStackPanel = new StackPanel();
myStackPanel.Children.Add(myEllipse);
return myStackPanel;
}
For some reason, the VisualBrush is not being rendered in the DrawRetangle(...) function. I can see the green border but nothing else. In addition, if I swap out the VisualBrush with a standard brush, it works great:
drawingContext.DrawRectangle(Brushes.Plum, new Pen(Brushes.Green, 2), new Rect(new Size(150, 150)));
Thanks in advance!
-Joel
