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Add comment, and use is_zero

This commit is contained in:
Giles Bathgate 2022-03-04 17:35:00 +00:00
parent c6ae1fb238
commit 57e9fa449d
1 changed files with 4 additions and 3 deletions
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7
Nef_S2/include/CGAL/Nef_S2/Sphere_circle.h
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@ -85,16 +85,17 @@ Sphere_circle(const Plane_3& h) : Base(h)
|h|. If |h| does not contain the origin, then |\Mvar| becomes the |h|. If |h| does not contain the origin, then |\Mvar| becomes the
circle parallel to |h| containing the origin.}*/ circle parallel to |h| containing the origin.}*/
{ {
if(h.d() != 0) if(!is_zero(h.d()))
*this = Plane_3(h.a(),h.b(),h.c(),RT(0)); *this = Plane_3(h.a(),h.b(),h.c(),RT(0));
} }
Sphere_circle(const Origin& o, const Vector_3& v) : Base(o,v) {} Sphere_circle(const Origin& o, const Vector_3& v) : Base(o,v) {}
Sphere_circle(const Origin&, const Plane_3& h) : Base(h.a(),h.b(),h.c(),RT(0)) {} Sphere_circle(const Origin&, const Plane_3& h) : Base(h.a(),h.b(),h.c(),RT(0))
{/* Even if |h| does not contain the origin, the circle will contain the origin
and be parallel to |h| */}
Sphere_circle(const RT& x, const RT& y, const RT& z) : Base(x,y,z,0) {} Sphere_circle(const RT& x, const RT& y, const RT& z) : Base(x,y,z,0) {}
/*{\Mcreate creates the circle orthogonal to the vector $(x,y,z)$.}*/ /*{\Mcreate creates the circle orthogonal to the vector $(x,y,z)$.}*/
Sphere_circle(Sphere_circle<R> c, const Sphere_point<R>& p) Sphere_circle(Sphere_circle<R> c, const Sphere_point<R>& p)