How to fix a lost VisualBrush string?

Question

In WPF, we can use VisualBrush to do something like ppt on the left side.

But I see that VisualBrush can lose a line in a Rectangle when I scale VisualBrush to a small size. As picture:

You can see that VisualBrush has lost the bottom line.

But I want, as shown below:

When I try to use BitmapImage, which use RenderTargetBitmap, to get the image and use the linear interpolation algorithm to zoom in, you get a sharpness image.

Can I change the VisualBrush algorithm, I think it can use the algorithm with neighboring pixels.

Is there any printing algorithm that has good performance like VisualBrush.

When I change my search key to ViewBox , I can find the same question as this one: how to avoid a single pixel string in wpf?

Answer 1

There is a class called TransformedBitmap that can scale your RenderTargetBitmap using the default scaling algorithm.

Use the following code:

 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 tried this method in my demo and got the result below. You may notice that the small rectangle in the upper left corner has not lost anything.