To extract start and end points of polylines you should use the
ObjectNodeX(obj, segment, node) and ObjectNodeY(obj, segment, node) functions
This will only work for single segment polylines as there is no (easy) way you
can tell which is the start/end point on multi segment polylines:
Update MYTABLE
Set STARTX = ObjectNodeX(obj, 1, 1),
STARTY = ObjectNodeY(obj, 1, 1),
ENDX = ObjectNodeX(obj, 1, ObjectInfo(obj, 20)),
ENDY = ObjectNodeY(obj, 1, ObjectInfo(obj, 20))
HTH,
Peter Horsb�ll M�ller
GIS Developer
Geographical Information & IT
COWI A/S
Odensevej 95
DK-5260 Odense S.
Denmark
Tel +45 6311 4900
Direct +45 6311 4908
Mob +45 5156 1045
Fax +45 6311 4949
E-mail [EMAIL PROTECTED]
http://www.cowi.dk/gis
-----Original Message-----
From: Matt Carlson [mailto:[EMAIL PROTECTED]
Sent: Tuesday, February 15, 2005 3:26 PM
To: MapInfo-L ([email protected])
Subject: MI-L Extracting Start and End Co-ordinates from polylines
Hello,
I'm trying to extract Start and End Co-ordinates from polylines.
I know Jaromir Svasta's p2p.mbx will extract all vertices from polylines, but I
only want start and end points of the polyline (there is no way of establishing
which are start/end and which are intermediate points...)
I have tried extracting ObjectGeography, but I keep getting the MBR
co-ordinates of the polyline, not the start and end...
Anyone got any ideas?
Cheers,
Matt __________________________________________________________________________
Matt Carlson
Senior Transport Planner
Arup
13 Fitzroy Street, London, W1T 4BQ, UK
Tel: +44 (0)20 7755 4114
Fax: +44 (0)20 7755 2451
mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
http://www.arup.com <http://www.arup.com>
http://www.arup.com/transportplanning/
<http://www.arup.com/transportplanning/>
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