CGAL users discussion list

[Guillaume Damiand <>]

Hi Guillaume,


Le 22/06/2015 10:09, Guillaume Gay a écrit :
> Hi all,
>
> I'm new to CGAL, so apologies in advance if I ask obvious questions.

They are not obvious ;)

> I'm starting to use LinearCellComplex to model biological epitheliums 
> (those are one cell thick sheets of tissues).
> I need to attach ids to faces, vertices and edges, as done in 
> Polyhedron_Items_with_id :
> http://doc.cgal.org/latest/BGL/classCGAL_1_1Polyhedron__items__with__id__3.html 
>
>
> If I understand correctly, this can be done in the definition of 
> CellAttributes. 

Yes.

> What I'm unsure of is how one can access the DartHandle of a cell with 
> a given id latter on, 

Two possibilities:
* use three std::vector to store the cell attribute handle associated 
with each id. Then given a cell attribute handle you can obtain one dart 
of the cell using the dart() method.
* use the operator[] on cell attribute, for example 
amap.attributes<1>[5] gives the cell attribute handle<1> numbered 5. 
Then use the dart() method.


> and the correct strategy to make sure ids are unique and no collision 
> occur.

Instead of associating directly an id to 0, 1 and 2-cells, create your 
own class containing an id, associate this class to 0-cell and 
initialize the id of 0-cell in its constructor incrementing a static 
variable (the same for 1 and 2 cells).

> So my question is: has anybody already coded ids attributes for LCC? 
> If not, what do you advise?
> Subsidiary question: I understand ids help interface Polyhedron_3 
> with  the boost graph library, is this achievable for LCC?

Not yet...

Best
Guillaume


> The code base is here: 
> https://github.com/CellModels/tyssue/tree/linearcellcomplew.
>
> Thank you for your input,
>
> Best,
>
> Guillaume


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