Hi all,
Last week I had a question how I could change a set of points which are
situated in a regular grid into a polygon. I came to the conclusion that
probably the easiest way is to change the points into squares, so that they
fit exactly to each other, and then combine them into one polygon.
For this I can use the alter object command to change the object for every
point into a rectangle, but with the alter object every record will be
changed one by one, which is much too slow, as I might have more then one
million records.
In the mapbasic help they recommand to use the Update command, where a
complete selection is changed. To change the object, they give the example:
Update "selection"
set object = CreatePoint(CentroidX(obj),CentroidY(obj))
This brings me to the next question: If I want to use the update command to
change the object, and I want to change the object into a rectangle, how can
I do that? It seems to me that one can only use CreatePoint(),
CreateCircle(), CreateLine() and CreateText(). Why isn't there a
CreateRect() function?
(There is a Create rect command, but it seems that I can not use that
together with the update command?)
Is there somebody who can help me with this, as the alter object command is
really not wotkable. (It would take some hours when you have a fast pc, with
a slow pc I really don't want to try this...)
Thanks, Carla
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