We’re two CS students at UQAR (University of Quebec At Rimouski, Canada), and we are working on a project that involves developing a DSL using MPS. This DSL has to be built around graphical notations that should look like the one depicted by the picture attached to this post.
Or you can wiew it here: http://hpics.li/4b394e3
We haven't yet figured out how to do it. And we are even wondering if it is possible at all using the current version of MPS (3.2).
Any help/reference will be much appreciated!
Mathieu & Adrien