title: WPF: How to crop/clip a Drawing or a DrawingImage?
body: <p>I have a function receiving a Drawing that I need to partially expose as a DrawingImage (i.e.: its position and size will be reduced/changed to fit in a target area).</p>
  
  <p>How can I crop/clip a region of the original Drawing?
  Or maybe it is easier to do that after the transformation to DrawingImage (how clip that DrawingImage)?</p>