Yoshiro, your probably has nothing to do with concavity : when you select
all the segments to create the border (as a polyline first) you miss some
very small ones : your border is multi-segmented (check by double-clicking
on it).
Pancho
Yoshiro Nagao wrote:
> Dear Sir and Madams,
>
> I imported an autocad DXF file into Mapinfo TAB file.
>
> ( This DXF had been generated by an autotracing software
> from an image file. This original image file
> is the borders of, say, many countries)
>
> I tried to make each the area surrounded by the
> polylines into a polygon by
> Object->"Convert to Region" of Mapinfo.
> If there was a concave border, however, this concave part
> would be shortcut by a single straight line.
>
> How can I avoid this and make the individual
> surrounded area into a polygon, no matter concave or convex,
> (preferably completely automatically, if possible)?
>
> Thank you very much for your assintance.
>
> Yoshi
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