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Fixing a bug (homegenous version of Construct_radical_line_2)

This commit is contained in:
Pedro Machado Manhaes de Castro 2008-10-21 13:31:56 +00:00
parent 20efbd1472
commit e76dfad626
1 changed files with 32 additions and 2 deletions
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32
Homogeneous_kernel/include/CGAL/Homogeneous/function_objects.h
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@ -50,7 +50,6 @@ namespace HomogeneousKernelFunctors {
using CartesianKernelFunctors::Compute_approximate_squared_length_3;
using CartesianKernelFunctors::Compute_area_divided_by_pi_3;
using CartesianKernelFunctors::Compute_squared_length_divided_by_pi_square_3;
using CartesianKernelFunctors::Construct_radical_line_2;
using CartesianKernelFunctors::Construct_radical_plane_3;
template <typename K>
@ -3153,6 +3152,37 @@ namespace HomogeneousKernelFunctors {
{ return h.rep().projection(p); }
};
template <class K>
class Construct_radical_line_2
{
typedef typename K::Line_2 Line_2;
typedef typename K::Circle_2 Circle_2;
typedef typename K::RT RT;
typedef typename K::FT FT;
public:
typedef Line_2 result_type;
result_type
operator() (const Circle_2 & c1, const Circle_2 & c2) const
{
// Concentric Circles don't have radical line
CGAL_kernel_precondition (c1.center() != c2.center());
const FT a = 2*(c2.center().x() - c1.center().x());
const FT b = 2*(c2.center().y() - c1.center().y());
const FT c = CGAL::square(c1.center().x()) +
CGAL::square(c1.center().y()) - c1.squared_radius() -
CGAL::square(c2.center().x()) -
CGAL::square(c2.center().y()) + c2.squared_radius();
const RT aa = a.numerator() * b.denominator() * c.denominator();
const RT bb = a.denominator() * b.numerator() * c.denominator();
const RT cc = a.denominator() * b.denominator() * c.numerator();
return Line_2(aa, bb, cc);
}
};
template <typename K>
class Construct_scaled_vector_2
{