[wpf] Object Capture 컨트롤 캡쳐

Usercontrol등 Element등을 캡쳐 할수 있도록 만들었다.

용도는 캠 이미지위에 배경및 각종 clip art들을 얹혀서 캡쳐 하기위한 용도~


 public static string SaveCamCapture(string filePath, FrameworkElement targetControl)
        {
            targetControl.UpdateLayout();
            // Get the size of the Visual and its descendants.
            Rect rect = VisualTreeHelper.GetDescendantBounds(targetControl);
            // Make a DrawingVisual to make a screen
            // representation of the control.
            DrawingVisual dv = new DrawingVisual();
            // Fill a rectangle the same size as the control
            // with a brush containing images of the control.
            using (DrawingContext ctx = dv.RenderOpen())
            {
                VisualBrush brush = new VisualBrush(targetControl);
                ctx.DrawRectangle(brush, null, new Rect(rect.Size));
            }
            RenderTargetBitmap targetBitmap = new RenderTargetBitmap((int)(targetControl.ActualWidth), (int)(targetControl.ActualHeight), 96, 96, PixelFormats.Pbgra32);
            targetBitmap.Render(dv);
            var bitmapEncoder = new PngBitmapEncoder();
            bitmapEncoder.Frames.Add(BitmapFrame.Create(targetBitmap));
            if (filePath != null)
            {
                using (var filestream = new FileStream(filePath, FileMode.Create))
                {
                    bitmapEncoder.Save(filestream);
                }
            }
            return filePath;
        }