How to fix VisualBrush lost line?

Question

In WPF ,we can use VisualBrush do some thing like ppt\'s left side.

But I see the VisualBrush may lost the line in Rectangle when I zoom the VisualBrush to a small s

Answer 1

There is a class named TransformedBitmap which can scale your RenderTargetBitmap with default scaling algorithm.

Use the code below:

public static BitmapSource ToBitmapSource(this Visual visual, Size size)
{
    var bounds = VisualTreeHelper.GetDescendantBounds(visual);
    var width = (int) Math.Round(bounds.Width);
    var height = (int) Math.Round(bounds.Height);
    var bitmap = new RenderTargetBitmap(width, height, 96.0, 96.0, PixelFormats.Pbgra32);
    bitmap.Render(visual);
    return new TransformedBitmap(bitmap, new ScaleTransform(size.Width / width, size.Height / height));
}

I've tried this method in my demo and got the result below. You may noticed that the small rectangle in the left-top corner lost nothing.