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Re: [cgal-discuss] Looking for example of 2D beziers from non-rational control points...


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  • From: Efi Fogel <>
  • To:
  • Subject: Re: [cgal-discuss] Looking for example of 2D beziers from non-rational control points...
  • Date: Tue, 13 Feb 2018 17:07:39 +0200
  • Authentication-results: mail3-smtp-sop.national.inria.fr; spf=None ; spf=Pass ; spf=None
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If you use the CGAL::Gmpq number type or the number type defined by one of the predefined kernels, you can simply initialize it from double.

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On 10 February 2018 at 23:00, Stuart Hungerford <> wrote:
Hi,

I have some data files with exported control points for 2D bezier
curves of degree 2 and 3 only.  The control points are exported as
floating point double precision values.

I believe to create CGAL Beziers I'll need to first convert these
floating point coordinates to rational approximations?

I don't need to perform intersections with the resulting curves, just
find their bounding boxes (AABB) and re-export them later with
floating point control points.

Does anyone have a small example of doing something like this in CGAL?
 I'm working my way through the examples in the
Arrangement_on_surface_2 directory which all seem to operate only in
rationals.

Thanks in advance,

Stu

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