Flow patterns in 2D?

[Gabriel Landini]

Hi,
Has anybody implemented something like this?:

http://www.csc.ncsu.edu/faculty/healey/HTML_papers/supernova/supernova.html

I am aware of FlowJ, but I am more interested in sets of points in the plane
(i.e. I do not have a stack of frames of flowing particles).

Cheers,

Gabriel