WPF: How to crop/clip a Drawing or a DrawingImage?

Question

Hello, 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).

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)?

Answer 1

I am a little confused on what you are asking but maybe my answer to this similar question will help?

http://stackoverflow.com/questions/2610114/how-can-i-use-a-pathgeometry-as-a-mask-for-a-bitmapsource-or-any-image-data/2615049#2615049

Answer 2

The solution was to encapsulate the original Drawing in a DrawingGroup and then apply a clipping geometry...

public void MyClippingFunc(Drawing OriginalDrawing, Rect ClippingArea)
{
    var Group = new DrawingGroup();
    Group.Children.Add(OriginalDrawing);
    Group.ClipGeometry = new RectangleGeometry(ClippingArea);

    return Group;
 }