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Re: [cgal-discuss] CGAL::compare_y wrong result


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  • From: Sylvain Pion <>
  • To:
  • Subject: Re: [cgal-discuss] CGAL::compare_y wrong result
  • Date: Tue, 13 Oct 2009 11:21:40 +0200
  • Organization: INRIA

Exact_predicates_exact_constructions_kernel::FT

Marco Aurelio Sterpa wrote:
And what type should I use instead of double?

2009/10/13 Sylvain Pion < <mailto:>>

I am not sure exactly where you want to go, but if you want
exact intersections between lines, you need to have a kernel
with exact constructions.

Try Exact_predicates_exact_constructions_kernel ?


Marco Aurelio Sterpa wrote:

They're different using this approach, so what is the better
type I have to use to get exact computing of intersection
between lines? I've made "typedef double NT", do I just need to
change "double" with another type to get the project compile
yet? Thanks in advance.

2009/10/13 Sylvain Pion
<

<mailto:>

<mailto:

<mailto:>>>

Sterpa a écrit :

I have this two points
1.1 -2.08 - 1.1 -2.08

and this is the output of CGAL::compare_y(point1, point2);

-1 (SMALLER)

how can this happen?
I've tried other approach such as a simple point1.y() !=
point2.y() or just
point1 != point2, but I never got the wrong output (which is
"EQUAL"). Do I
need to use another function?


Does it still print the same .y() values if you do the
following ?

std::cout.precision(20);

-- Sylvain Pion
INRIA Sophia-Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/

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-- Sylvain Pion
INRIA Sophia-Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/
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--
Sylvain Pion
INRIA Sophia-Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/



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