If you look at the syntax for create Polyline, I think you need to specify how
many segments it should contain:
Create Pline
[ Into { Window window_id | Variable var_name } ]
[ Multiple num_sections ]
num_points
( x1, y1) ( x2, y2) [ ... ]
If is the Multiple num_sections I'm refering to.
But, I think this was added in a later version of MapInfo, and it is not
available in MB 4.5
So I guess you have to create only single segment polylines, and then combine
them everytime you shift to next segment
Something like this:
Do While (...)
'**Here you read the segment#, point# and the coordinates
If nCurSegm <> nNextSegm Then
If nNumSegment = 0 Then
ElseIf nNumSegment = 1 then
oMultiSegment = oSingleSegment
else
oMultiSegment = Combine(oMultiSegment, oSingleSegment)
End if
Create PLine Into Variable TempPolyLine 0
nNumSegment = nNumSegment + 1
End if
'**Here you add the nodes
Loop
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
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http://www.cowi.dk/gis
-----Original Message-----
From: David Baker [mailto:[EMAIL PROTECTED]
Sent: Monday, January 17, 2005 9:45 AM
To: [email protected]
Subject: MI-L Mapbasic: Creating polylines with multiple sections
I have a MapBasic 4.5 command:
Alter Object TempPolyLine Node Add Position PolylineSections,
ObjectInfo(TempPolyLine, OBJ_INFO_NPNTS) + 1 (PointLong, PointLat)
TempPolyLine is my polyline which was originally created with:
Create Pline Into Variable TempPolyLine 0
PolylineSections is a "SmallInt value (one or larger), identifying one section
from a
polyline object".
ObjectInfo(TempPolyLine, OBJ_INFO_NPNTS) + 1 is of course the number of
existing nodes + 1, to refer to my new node number that I am about to create.
PointLat & PointLong are my Latitude & Longitude of the node I want to create.
I am reading in polylines from another file format (Garmin .mp "polish"
format). These
polylines have multiple sections, so I want to create the MapInfo polylines
with the same
multiple sections.
All works well while PolylineSections is 1, but as soon as I try to add the
first node after
changing PolylineSections to 2, I get a MapBasic error:
"Alter Object Node Add failure"
Am I trying to do this the wrong way? Can I just keep adding points & the new
section
will be created automatically, or am I missing some command to inform MapBasic
that I
am adding in a new section?
Thanks,
Dave
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