a.cs

        void onCanvasDraw(ICanvasAnimatedControl sender, CanvasAnimatedDrawEventArgs args)
        {
            args.DrawingSession.Clear(Colors.Aquamarine);

            using (var offscreenSession = _offscreenCanvas.CreateDrawingSession())
            {
                offscreenSession.Transform = _scale;

                offscreenSession.Clear(Colors.Aquamarine);

                offscreenSession.DrawText(Text, 0, 0, Colors.Red, _ctf);
                offscreenSession.DrawLine(new Vector2(0,0), new Vector2(100,10), Colors.Black);
            }

            args.DrawingSession.DrawImage(_offscreenCanvas, 0,0);

            args.DrawingSession.Transform = _scale;

            args.DrawingSession.DrawText(Text, 0, 20, Colors.Red, _ctf);
            args.DrawingSession.DrawLine(new Vector2(0, 20), new Vector2(100, 30), Colors.Black);
        }