The issues that have been raised recently (refer MI-L Cosmetic Precision -
Big problem) are ones that I am currently struggling with.
I use a mapbasic code routine to snap lines to point features. The routine
searches for a point feature, grabs it coordinates and updates the node of
the line. This all works fine but when I then update the original polyline
record with the revised object MapInfo appears to randomly change the end
point of the line. I have even written a debug routine to check this - the
routine alters the coordinate of a polyline, updates the record then queries
the node on the updated polyline and 9 times out of 10 it is not the same.
I know that this is not due to projection accuracy issues as I have tested
this exhaustively. I know this is not due to my logic as again I have
tested this (over and over and over!!!)
One of the weird things about this error is that each time I run exactly the
same code on exactly the same data I get different results and if I run it
long enough sometimes the polylines will correctly update.
The only thing I can think of is that
a) it is a MapInfo bug
b) it is related to the projection engine that deals with my region
of the world (New Zealand)
Other developers must have had this problem before! But I cannot find any
references to this is the archives.
I have been developing in MapInfo/MapBasic for 7 years so I am confident I
have covered all bases in terms of the problem being the logic of my code.
Anyone got any ideas?
Martin Roundill
GIS and WEB MANAGER, IM (Ext 8344)
Providing effective coordinated and independent expertise, supporting all
Council's operational and strategic information management requirements.
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Thank You.
http://www.waitakere.govt.nz
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