Re: MI-L Mapbasic: Creating polylines with multiple sections
Maybe the easiest way would be to create these segments as an array of separate polyline objects, and then combine them into one when you have finished. r On Mon, 17 Jan 2005 16:44:45 +0800, David Baker [EMAIL PROTECTED] wrote: 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 - List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 14872 -- Robert Crossley Agtrix P/L 9 Short St PO Box 63 New Brighton 2483 Far Southern Queensland AUSTRALIA 153.549004 E 28.517344 S P: 02 6680 1309 F: 02 6680 5214 M: 0419 718 642 E: [EMAIL PROTECTED] W: www.agtrix.com W: www.wotzhere.com - List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 14873
RE: MI-L Mapbasic: Creating polylines with multiple sections
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 Horsbøll Møller
GIS Developer
Geographical Information IT
COWI A/S
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DK-5260 Odense S.
Denmark
Tel +45 6311 4900
Direct +45 6311 4908
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E-mail [EMAIL PROTECTED]
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-Original Message-
From: David Baker [mailto:[EMAIL PROTECTED]
Sent: Monday, January 17, 2005 9:45 AM
To: MapInfo-L@lists.directionsmag.com
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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Message number: 14874
RE: MI-L Mapbasic: Creating polylines with multiple sections
On 17 Jan 2005 at 10:37, Peter Horsbøll Møller [EMAIL PROTECTED] wrote: If you look at the syntax for create Polyline, I think you need to specify how many segments it should contain: 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 Thanks Peter (and Robert). You are correct that this parameter isn't in 4.5, so your lateral thinking got me out of trouble. ElseIf nNumSegment = 1 then oMultiSegment = oSingleSegment else oMultiSegment = Combine(oMultiSegment, oSingleSegment) End if This idea works nicely. Excellent - I can hang onto my MapBasic 4.5 a little bit longer. :-) Dave - List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 14877
