doublecircle.h

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/*
 * $Id: doublecircle.h 17559 2014-09-19 00:49:43Z predoehl $
 */

#ifndef DOUBLECIRCLE_H_UOFARIZONAVISION
#define DOUBLECIRCLE_H_UOFARIZONAVISION 1

#include <l/l_sys_sys.h>
#include <m_cpp/m_vector_d.h>
#include <qd_cpp/pixpoint.h>

#include <vector>


namespace kjb
{
namespace qd
{

struct DoubleCircle
{
    double radius;  
    Vector2 center; 

    DoubleCircle( double rad, const Vector2& ctr )
    :   radius( fabs( rad ) ),
        center( ctr )
    {}

    DoubleCircle(
        const Vector2& p1,
        const Vector2& p2,
        const Vector2& p3
    );

    DoubleCircle( const Vector2& p1, const Vector2& p2 )
    :   radius( ( p1 - p2 ).magnitude() * 0.5 ),
        center( ( p1 + p2 ) * 0.5 )
    {}

    void swap( DoubleCircle& that )
    {
        std::swap( radius, that.radius );
        center.swap( that.center );
    }

    bool is_degenerate() const
    {
        return      ! finite( radius )
                ||  radius <= 0
                ||  isnand( center.x() )
                ||  isnand( center.y() );
    }

    bool is_not_degenerate() const
    {
        return ! is_degenerate();
    }

    DoubleCircle( const std::vector< Vector2 >& );

    bool outside_me_is( const Vector2& query ) const
    {
        return radius < ( query - center ).magnitude();
    }
};





}
}

namespace std
{

    template<>
    inline void swap(
        kjb::qd::DoubleCircle& p1,
        kjb::qd::DoubleCircle& p2
    )
    {
        p1.swap( p2 );
    }

}



#endif /* DOUBLECIRCLE_H_UOFARIZONAVISION */