@i cgal_util.fwi
@B@<Intersection of two circles@>

@O@<../include/CGAL/Circle_2_Circle_2_intersection.h@>==@{
@<cgal_heading@>@(@-
include/CGAL/Circle_2_Circle_2_intersection.h@,@-
intersection_2_3.fw@,@-
Geert-Jan Giezeman@,@-
MPI, Saarbruecken@)

#ifndef CGAL_CIRCLE_2_CIRCLE_2_INTERSECTION_H
#define CGAL_CIRCLE_2_CIRCLE_2_INTERSECTION_H

#include <CGAL/Object.h>

CGAL_BEGIN_NAMESPACE

template <class R>
bool
do_intersect(const Circle_2<R> &tr1, const Circle_2<R>&tr2);

CGAL_END_NAMESPACE

#ifdef CGAL_CFG_NO_AUTOMATIC_TEMPLATE_INCLUSION
#include <CGAL/Circle_2_Circle_2_intersection.C>
#endif
#endif
@}

@O@<../include/CGAL/Circle_2_Circle_2_intersection.C@>==@{
@<cgal_heading@>@(@-
include/CGAL/Circle_2_Circle_2_intersection.C@,@-
intersection_2_2.fw@,@-
Geert-Jan Giezeman@,@-
Saarbruecken@)


#include <CGAL/Circle_2.h>
#include <CGAL/squared_distance_2_1.h>
CGAL_BEGIN_NAMESPACE

template <class R>
bool
do_intersect(const Circle_2<R> & circ1, const Circle_2<R>& circ2)
{
    typedef typename R::FT FT;
    FT sr1 = circ1.squared_radius();
    FT sr2 = circ2.squared_radius();
    FT squared_dist = squared_distance(circ1.center(), circ2.center());
    FT temp = sr1+sr2-squared_dist;
    return !(FT(4)*sr1*sr2 < temp*temp);
}

CGAL_END_NAMESPACE

@}


@B@<Packing intersections together@>

@O@<../include/CGAL/intersection_2_3.h@>==@{@-
@<cgal_heading@>@(@-
include/CGAL/intersection_2_3.h@,@-
intersection_2_3.fw@,@-
Geert-Jan Giezeman@,@-
Saarbruecken@)


#ifndef CGAL_INTERSECTION_2_3_H
#define CGAL_INTERSECTION_2_3_H

#include <CGAL/Circle_2_Circle_2_intersection.h>

#endif
@}