segment2.h

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* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
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* Copyright(C) 2004                                                \/)\/    *
* Visual Computing Lab                                            /\/|      *
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#ifndef __VCGLIB_SEGMENT2
#define __VCGLIB_SEGMENT2

#include <vcg/space/point2.h>
#include <vcg/space/line2.h>
#include <vcg/space/box2.h>

namespace vcg {

template <class SegmentScalarType >
class Segment2
{
public: 

        typedef SegmentScalarType ScalarType;

        typedef Point2<SegmentScalarType> PointType;

        typedef Segment2<SegmentScalarType> SegmentType;

private:

        PointType _p0,_p1;

public:

  inline const PointType &P0() const { return _p0; } 
  inline const PointType &P1() const { return _p1; } 
  inline PointType &P0() { return _p0; } 
  inline PointType &P1() { return _p1; } 
        Segment2() {};
        Segment2(const PointType &a, const PointType &b) { _p0=a; _p1=b; };
        inline bool operator == ( SegmentType const & p ) const
        {       return _p0==p._p0 && _p1==p._p1; }
        inline bool operator != ( SegmentType const & p ) const
        {       return _p0!=p._p0 || _p1!=p._p1; }
        void Set( const PointType &a, const PointType &b)
        {       _p0=a; _p1=b;}
        inline PointType P( const ScalarType t ) const
        { return _p0 + (_p1 - _p0) * t; }
        inline PointType MidPoint( ) const
        { return ( _p0 +  _p1) / ScalarType(2.0) ; }
        inline Box2<ScalarType> BBox( ) const
        { 
          Box2<ScalarType> t; 
          t.Add(_p0);
          t.Add(_p1);
          return t; 
        }
        ScalarType Length()
        { return (_p0 - _p1).Norm(); }

        ScalarType Length() const
        { return (_p0 - _p1).Norm(); }

        ScalarType SquaredLength()
        { return (_p0 - _p1).SquaredNorm(); }
        void Flip()
        { PointType t=_p0; _p0=_p1; _p1=t; }
        template <class Q>
        inline void Import( const Segment2<Q> & b )
        { _p0.Import( b.P0() ); _p1.Import( b.P1() );
        }
        template <class Q>
        static SegmentType Construct( const Segment2<Q> & b )
        { return SegmentType(PointType::Construct(b.P0()), PointType::Construct(b.P1()));}


        inline SegmentType operator + ( SegmentType const & p) const
        {return SegmentType( _p0+p.P0(), _p1+p.P1() );}
        inline SegmentType operator - ( SegmentType const & p) const
        {return SegmentType( _p0-p.P0(), _p1-p.P1() );}
        inline SegmentType operator * ( const ScalarType s ) const
        {return SegmentType( _p0*s, _p1*s );}
        inline SegmentType operator / ( const ScalarType s ) const
        {ScalarType s0=((ScalarType)1.0)/s; return SegmentType( _p0*s0, _p1*s0 );}

}; // end class definition



typedef Segment2<short>  Segment2s;
typedef Segment2<int>    Segment2i;
typedef Segment2<float>  Segment2f;
typedef Segment2<double> Segment2d;

template <class ScalarType> 
Point2<ScalarType> ClosestPoint( Segment2<ScalarType> s, const Point2<ScalarType> & p) 
{
        vcg::Line2<ScalarType> l;
        l.Set(s.P0(),s.P1()-s.P0());
        l.Normalize();
        Point2<ScalarType> clos=vcg::ClosestPoint<ScalarType,true>(l,p) ;//attention to call
        vcg::Box2<ScalarType> b;
        b.Add(s.P0());
        b.Add(s.P1());
        if (b.IsIn(clos))
                return clos;
        else
        {
                ScalarType d0=(s.P0()-p).Norm();
                ScalarType d1=(s.P1()-p).Norm();
                if (d0<d1)
                        return (s.P0());
                else
                        return (s.P1());
        }
        /*ScalarType t = s.Projection(p); 
        if (s<0) return s.P0();
        if (s>1) return s.P0();
        return s.P(t);*/ 
}

} // end namespace
#endif

---

vcglib
Author(s): Christian Bersch
autogenerated on Fri Jan 11 09:17:54 2013