All you have to do is define a region with 2 regions and list them one
after the other with the number of nodes, if you export a doughnut you
will see in the MIF file the following structure:
Region 2
10
-0.203947 0.730263
-0.019737 0.736842
0.217105 0.631579
0.388158 0.526316
0.763159 0.230263
0.953947 -0.598684
-0.322368 -0.644737
-0.980263 0.144737
-0.736842 0.447368
-0.203947 0.730263
8
-0.039474 0.328947
-0.256579 0.171053
-0.013158 -0.098684
0.388158 -0.098684
0.210526 0.138158
0.098684 0.230263
0.026316 0.342105
-0.039474 0.328947
Pen (1,2,0)
Brush (1,0,16777215)
Center 0.54258 0.046052
Hope this helps,
Nicolas Muszynski
-----Original Message-----
From: Tamar Bakker [mailto:[EMAIL PROTECTED]
Sent: 12 ao�t 2004 07:35
To: [EMAIL PROTECTED]
Subject: MI-L donut polygons
Hello listers,
I'm importing donut(island) polygons into MapInfo. Because I want to
generate a MIF file with donut polygons, I would like to know how the
converter in MapInfo decides if a polygon is just a normal multipart
polygon or if it's a polygon with holes in it.
I can't recognise anything that says it's a donut polygon. Or does
anyone know a fast equation that calculates if all the nodes of a
certain polygon are situated within another polygon?
Does anyone know?
Thanks a lot
greetings Tamar
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