Geometric shape recognition using c++

[musimbate]

Hi all,
lately I need to integrate geometric shape recognition into a drawing application that I am working on and I am looking for c++ libraries that could help with that.The idea is like this :For example when a user draws something that is close to a circle the program should draw a regular circle in the bounding rectangle.It would be great to do the same on rectangles,triangles etc.

Suggestions and pointers should really be appreciated.Thanks.

[raven-worx]

does your drawing application take advantages of QGraphicsView?

[musimbate]

Yes it does.Des Qt have a way to do that without requiring the use of third party libraries?I would really be glad to learn about that.