Re: [boost] [geometry] area, length, centroid, behaviour

Subject: Re: [boost] [geometry] area, length, centroid, behaviour
From: Mika Heiskanen (mika.heiskanen_at_[hidden])
Date: 2009-02-27 14:32:05

I wrote:

 > However, I'd hate to have to produce a certain winding rule for the
 > exterior and the holes in order to use the same data for more
 > complicated GIS calculations such as logical operations and buffering.
 > IMHO it should be just as easy as choosing to use the even-odd filling
 > rule instead of the winding rule.

To which Barend Gehrels replied:

 > It cannot be called from the algorithms themselves: to
 > verify the winding rule the area has to be calculated beforehand. This
 > will drastically decrease performance.

Certainly area calculation is significantly faster than logical operations
and buffering.

 > The solution might be a traits class telling the winding rule the
 > polygon type has.

Agreed.

[Sorry about the unorthodox quoting, I rebuilt the reply by googling]

--> Mika Heiskanen