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Subject: Re: [geometry] Adaption of legcay hierarchy to Boost.Geometry model
From: Bruno Lalande (bruno.lalande_at_[hidden])
Date: 2013-02-01 17:31:21

Hi Mihis,

The problem is, you are trying to adapt a structure which is fundamentally
read-only. I mean the calculated curve itself is read only, and that's what
you're trying to adapt to the linestring concept, as opposed to adapting
the inner segment used for the curve calculation.

So as you have guessed, only the non-mutating algorithms will be available
to you (things like distance, length, etc). It wouldn't make any sense, by
definition, to try to mutate your curve since it's a calculated thing so
modifying any of its points would potentially break the validity of the
curve in regards to the algorithm that generated it.

However, I still understand the value of using algorithms like buffer and
simplify on your calculated curve. You'll simply have to use a different,
mutable, non-calculated structure as the output. Could be the
Boost.Geometry linestring class or anything else. Anything that fulfills
the linestring concept and is not a read-only calculated thing. And you can
then use it for whatever further processing you need to do with the
simplified/bufferized/mutated curve. Of course this will never be fed back
to the original curve class since, as we said, it's a calculated and
immutable thing.

Does that make sense at all?


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