[mapguide-users] Creating a new line layer at run time

[Mark Pendergraft]

If you can get the geometry of the line, then why not create a new
temporary feature source, a new temporary layer, write the geometry to
the feature source, and save all of it to the users session?

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of
passionlessDrone
Sent: Wednesday, July 11, 2007 1:44 PM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] Creating a new line layer at run time


Hello friends - 

MapGuide 1.2 / PHP / Postgres\PostGIS / Windows environment.

I have a table with many lines in it.  I'd like to be able to retrieve
one
record of line information, create a new layer on the fly, populate it
with
that line information, save to repository and go.  I have been able to
perform this operation with Point data using the development guide as a
basis.  There is something in the dev guide / samples for creating a
line,
but it seems like it won't work for my situation for a few reasons.

1) My underlying table has bunches of lines in it.  I need to detect the
user input and show only the line they are interested in. 

2) Filtering against PostGIS doesn't seem to work; otherwise I'd just
grab
the existing layer, filter out everything except the one line I need to
see,
push to the repository, and go.  

I've already got the lines defined; but I can't figure out how to take
the
geometry from the right row and populate it into a new feature for
serving
up at runtime.

If need be, I can also retrieve all of the points that comprise the
line; I
saw something in the dev guide that seemed to indicate I could define
aline
segment by going from point to point, creating lines.  I suppose it
would be
possible to get every point ordered, and create a line from 1 - 2, 2-3,
3-4
....  Is this my only choice? 

Can anyone help? 

Thanks! 

-brian
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