Non-random arrangement in circle grid about datamol

[hadim]

I can see a call to random() in the layout logic:

datamol/datamol/viz/_circle_grid.py

Line 284 in 3ff8561

rand_unit = random.random() * 2 * math.pi

@maclandrol would that be as easy as using a seed here?

[maclandrol]

If you use random.seed before calling the function, you should get the same layout everytime. It might make sense to have an argument ring_mol_start_angle that set a starting angle defined by the user (would likely just be replacing the random unit variable)

[hadim]

Indeed it works well.

For ring_mol_start_angle I think it's nice to have it to give even more control over the layout (at the risk of increasing the number of args of that function!).

Will ping when done at #206 206

[hadim]

You can now either set a random seed to make the layout deterministic with layout_random_seed or even specify yourself starting angles with ring_mol_start_angles_degrees.

Thanks as I think those two features will be useful to many!

FYI: I'm going to wait for #201 before cutting a new version.