Alex, and all of you
My direct answer to Alex would be that drawing direction has nothing to do
with his problem. But as there has already been some discussion about that
subject in the context particularly of "donut" regions, I would like to put
that subject to rest.
I conducted some tests, not as extensive as I would like perhaps, but they
seem to indicate that MI is indifferent to "line direction" in its treatment
of multiple polygon regions, donut included.
The test : drawing two closed polylines one inside the other, duplicating
them on the spot and converting them to regions, setting target to the
larger region and erasing with the smaller. I did that twice, drawing the
plines in the same direction and in opposite directions. I read from the
exported MIF file and saw that the internal polygon is a faithful copy of
the original pline, i.e. respecting the original drawing directions.
If the idea that MI "recognizes" holes by the drawing direction of the
polygons, that idea must be surrendered for good. But as I have a limited
knowledge in this area, I would like very much to have my conclusion
supported or challenged.
Jacques Paris
e-mail alternate
[EMAIL PROTECTED] [EMAIL PROTECTED]
paris PC Consult (mainly MapInfo app.)
www.total.net/~rparis/gisproducts.htm
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Alex Teleshev
Sent: April 21, 2000 4:35 AM
To: [EMAIL PROTECTED]
Subject: MI Combined wrong polygon - need a help
Hello Listers,
Hard question : My operators create a lot of polygons, then combine
them to one polygon object. But when I try to make it transparent I
can't do it. My idea - some objects was drawn clockwise, the others
counterclockwise. But my problem is-now I have 1 object with wrong
features. How can I correct it ?
Best regards,
Alex Teleshev
Director & geologist
RIFT Ltd.
18 suite 6 Rudnaya str.
Semipalatinsk VKO
490044 Kazakstan
mailto:[EMAIL PROTECTED]
[EMAIL PROTECTED]
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