Does someone know what isles are *exactly* in the grass vector model?
Isles in contrast to areas. I'm only interested in the definition of
first-generation isles, not "an island in a lake on an island in a lake...".
I guess, an isle consists of one or more areas located within a larger
area, and the isle does not touch the boundaries of the larger area. Is
that right?
And maybe someone can explain to me the magic of
dig_build_area_with_line()? I guess this function somehow determines if
boundaries form an area (clockwise) or an isle (CCW). A wild guess.
Thanks,
Markus M
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