Hi Jack -
Have you tried this:
Set Coordsys Table "KnownPositions"
instead of setting the coordsys from the window? If the projection of the
window doesn't match the projection of the table into which you are
inserting the point, the point may well be off the map.
Cheers,
Lindsay Giles
Senior GIS Analyst
AXYS Environmental Consulting Ltd
Suite 600-555 4th Ave. SW
Calgary, AB
T2P 3E7
e-mail: [EMAIL PROTECTED]
Main Office: 403-269-5150
Direct Line: 403-750-7671
Fax: 403-269-5245
Visit our web site at http://www.axys.net
-----Original Message-----
From: Jack MacDonald [SMTP:[EMAIL PROTECTED]]
Sent: Monday, June 19, 2000 1:17 PM
To: [EMAIL PROTECTED]
Subject: MI Help with Coordinate system
My application in MapBasic 4.5 is driving me crazy, and
I would really appreciate some help. I am reasonably
certain the problem is with getting the correct
CoordSys, but after many hours, I still can't figure it
out.
The concept is that the user selects a point from the
SurveyedTrails table. I want to grab the XY coordinates
of the selected point, and create a new point in the
KnownLocations table using the same XY coordinates. The
new point is created when the user clicks a button in a
dialog box that Calls FixedPoint().
I have tried saving a Global oPoint object, saving the
XY coordinates in Global variables, and every other
combination that I can think of.
At first, the points were created at the wrong location,
now I can't find them at all.
Please help!
***********************
global fEasting as float
global fNorthing as float
global iHour as Integer
global iMinute as Integer
global iSecond as Integer
global iNodeID as Integer
global hWnd as Integer
global oPoint as Object
sub FixedPoint
dim oNewPoint as object
set coordsys window hWnd
oNewPoint =
createPoint(centroidx(oPoint),centroidy(oPoint))
Insert into KnownPositions (Obj, SampleSetID,
NodeID, Hour, Minute, Second)
values (oNewPoint, iSampleSetID, iNodeID,
iHour, iMinute, iSecond)
end sub
sub SelChangedHandler
dim sTableName as string
dim iRow as Integer
iRow = SelectionInfo(SEL_INFO_NROWS)
If iRow <> 1 then
' note "Wrong number of objects selected"
exit sub
end if
sTableName = SelectionInfo(SEL_INFO_TABLENAME)
do case sTableName
case "GPSSample"
iHour = selection.hour
iMinute = selection.minute
iSecond = selection.second
close table tableinfo(0,TAB_INFO_NAME)
case "SurveyedTrails"
hWnd = frontwindow()
set coordsys window hWnd
oPoint = selection.obj
fNorthing = selection.northing
fEasting = selection.easting
iNodeID = selection.nodeID
close table tableinfo(0,TAB_INFO_NAME)
call CreateGPSTrailsDialog
case else
' print "neither of the two target tables"
end case
end sub
Jack MacDonald, Senior Researcher, Harvesting Operations
Forest Engineering Research Institute of Canada
Vancouver, BC Canada (604) 228-1555 FAX (604) 228-0999
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