What Is the Method for Conducting 2D Fourier Analysis of Complex Shapes?

[hadoque]

I'm studying for a re-examn in a physical measuring techniques course that includes some Fourier analysis. On old exams there are always a question about a graphical 2d Fourier transform. It can be an ellipse containing a grid of circels, or something like that. In the solutions he takes the transform of the surrounding shape, the grid and the shape of the grid.
I can't find any information about this approach the course litterature (The Fourier Transform & Its Applications) nor on the internet. Does this approach have a name, and does anyone know of information about this?

Thanks

 

[fresh_42]

For anybody with a similar question:
https://www.ncurproceedings.org/ojs/index.php/NCUR2012/article/download/241/207
looks promising.