[Cartoweb-users] Questions about about pgdijkstra

[Sylvain Pasche]

Hello,

Yes, that's really embarrassing that the mailing list does not change
the "reply-to" header in the mail sent to the list.

Ok, now I understand your problem better. I guess that for your needs,
the create_graph_tables would need to be enhanced to handle graph
direction better. Unfortunately, I won't have time to work in this, but
you can still fill a bug report there
http://bugzilla.maptools.org/query.cgi (use product CartoWeb, and put
[pgdijkstra] in the bug title) if you want to keep an eye on it. If you
can provide examples and a detailed description how you think it should
behave, that's better.

Cheers,

Sylvain

Le mardi 17 janvier 2006 à 15:21 -0500, Fay Du a écrit :
> Sylvain: 
> 
> Oops, Sorry again, click reply without looking again. Now I send email
> to the list. 
> 
>  
> 
> Fay
> 
>  
> 
> Sylvain:
> 
> Sorry, I don't mean sent my email to you. I just clicked reply button
> and somehow it went to you directly. I thought it went to list. I will
> double check to address before click send button.
> 
>  
> 
> For the question, I got the answerer by match shortest pass with
> original data. Actually, although shortest_pass does not use geometry
> directly, but when we call create_graph_tables, the function reads
> source from start point, and reads target from end point. So,
> Pgdijsktra still follow edge graph direction to create shortest path.
> If an edge start point is A and end point is B, if we set
> directed=ture, the shortest cannot go from B to A.
> 
>  
> 
> Thanks
> 
> Fay
> 
>  
> 
>  
> 
>  
> 
> -----Original Message-----
> 
> From: Sylvain Pasche [mailto:sylvain.pasche at camptocamp.com] 
> 
> Sent:Tuesday, January 17, 2006 10:21 AM
> 
> To: Fay Du
> 
> Subject: RE: [Cartoweb-users] Questions about about pgdijkstra
> 
>  
> 
> I'm sorry, I sill don't get the point.
> 
>  
> 
> But please, send mail to the mailing list only, not directly to me.
> 
>  
> 
> Cheers,
> 
>  
> 
> Sylvain
> 
>  
> 
> Le mardi 17 janvier 2006 à 09:29-0500, Fay Du a écrit :
> 
> > No. The issue is related with shortest_path.
> 
> > 
> 
> > -----Original Message-----
> 
> > From: cartoweb-users-bounces at lists.maptools.org
> 
> > [mailto:cartoweb-users-bounces at lists.maptools.org] On Behalf Of 
> 
> > Sylvain Pasche
> 
> > Sent: Tuesday, January 17, 2006 4:55 AM
> 
> > To: Cartoweb users
> 
> > Subject: RE: [Cartoweb-users] Questions about about pgdijkstra
> 
> > 
> 
> > Le lundi 16 janvier 2006 à 14:05-0500, Fay Du a écrit :
> 
> > 
> 
> > > > 
> 
> > > -- What I trying to say is, if I set directed=ture, if there is a 
> 
> > > segment S, which start point is A, end point is true, can a
> shortest 
> 
> > > pass goes from point B to A when it passes Segment S? Do I have
> to 
> 
> > > physical set Segment S start point to point B, and end point to
> A? 
> 
> > > ie.
> 
> > 
> 
> > > 
> 
> > >    When I use following select command:
> 
> > > Select astext(the_geom) from graphy where id=Sid;
> 
> > > In return "MULTILINESTRING", the first point has to be Point B's 
> 
> > > coordinate, and last point has to be A's coordinate?
> 
> > > 
> 
> > > If it is not necessary, how program know from Point B to A is 
> 
> > > allowed and Point A to B is not allowed?
> 
> > > 
> 
> > > Hope I explain myself clearly this time.
> 
> > > Fay
> 
> > > 
> 
> > 
> 
> > Pgdijsktra does not use geometry. Geometries are only used for 
> 
> > instance with the assign_vertex_id() and
> shortest_path_as_geometry() 
> 
> > functions.
> 
> > 
> 
> > Is your issue related to the use of one of these functions ?
> 
> > 
> 
> > _______________________________________________
> 
> > Cartoweb-users mailing list
> 
> > Cartoweb-users at lists.maptools.org 
> 
> > http://lists.maptools.org/mailman/listinfo/cartoweb-users
> 
> > 
> 
>  
> 
>  
> 
> 
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