Just to add that for a normal user to think in primitives is going to be
kind of difficult. To try to delete an edge or change a topogeometry can
be very tricky.
My opinion is that a user should work with topogeometries as if they
were normal geometries. PostGIS in a transparent way should deal with
the primitives. I know Im asking too much. Not for now. I already happy
a lot with persistent topology as it is right now.
On 12/04/2012 23:15, Jose Carlos Martinez Llario wrote:
On 12/04/2012 23:08, Andrea Peri wrote:
>I think your questions are related with a previous post today about
>synchronizing topogeometries.
>
>In fact, for editing topogeometries without using primitive commands I
>was thinking in:
>
>1.- Delete the topogeometry
>2.- Remove the primitives which depend just on the geometry deleted.
>3.- With totopogeom insert again the whole geometry
>
>I know this procedure is not optimized at all but maybe this way (with a
>new function which does this work) one can avoid the complicated task
>about using primitive editing commands and to edit the relation table
>manually.
>I have the feeling I not taking into account many things though.
>
>What do you think about this procedure Sandro?
Hi, I guess is not sufficient delete the single topogeometry. An edge
could be linked to one or two faces,
and also the same edge could be linked to many topogeometry.
Infact the topogeometry not necessary need to be mutually exclusive
to each-other ans instead are the topology edge and faces.
So I could have more than one topogeometry on a single edge.
And I should remove also every topogeometry that is linked to the
edge I would remove.
Thats why I said to remove just the primitives which depend on the
geometry deleted (and not from any other one). This way one can clean
the primitives which are not shared by any other geometry. Its like
the garbage collector Sandro said before.
After that one can insert again the whole modified geometry.
Dont know if I could explain myself.
So I could have, for example:
on this sample:
----------------
/ | \ (universe Face)
| | |
| F1 | F2 |
| | |
| e1 e2
| | |
\----------------/
/ \
| |
| F3 |
| |
| |
| |
\---------------/
A topogeometry T1 = F1 + F3
another topogeometry T2 = F2 + F3
and another again T3 = F2
and again a topogeometry T4 = F1
so if I plan to remove the edge "e1" I should save all four topogeometry and
re-apply them after.
--
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
-----------------
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