/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
History
$Log: not supported by cvs2svn $
Revision 1.8 2004/05/14 03:14:04 ponchio
Added Distance
Revision 1.7 2004/05/10 10:58:35 ganovelli
name of the constructor changed from LineType to Line3
Revision 1.6 2004/03/11 11:47:20 tarini
minor updates, corrections, added documentations, etc.
Revision 1.5 2004/03/10 15:27:48 tarini
added Normalized flag
Revision 1.1 2004/03/08 16:15:48 tarini
first version (tarini)
****************************************************************************/
#ifndef __VCGLIB_LINE3
#define __VCGLIB_LINE3
#include <vcg/space/point3.h>
namespace vcg {
/** \addtogroup space */
/*@{*/
/**
Templated class for 3D lines.
This is the class for infinite lines in 3D space. A Line is stored just as two Point3:
an origin and a direction (not necessarily normalized).
@param LineScalarType (template parameter) Specifies the type of scalar used to represent coords.
@param NORM: if on, the direction is always Normalized
*/
template <class LineScalarType, bool NORM=false>
class Line3
{
public:
/// The scalar type
typedef LineScalarType ScalarType;
/// The point type
typedef Point3<LineScalarType> PointType;
/// The line type
typedef Line3<LineScalarType,NORM> LineType;
private:
/// Origin
PointType _ori;
/// Direction (not necessarily normalized, unless so specified by NORM)
PointType _dir;
public:
//@{
/** @name Members to access the origin or direction
Direction() cannot be assigned directly.
Use SetDirection() or Set() instead.
**/
///
inline const PointType &Origin() const { return _ori; }
inline PointType &Origin() { return _ori; }
inline const PointType &Direction() const { return _dir; }
/// sets the origin
inline void SetOrigin( const PointType & ori )
{ _ori=ori; }
/// sets the direction
inline void SetDirection( const PointType & dir)
{ _dir=dir; if (NORM) _dir.Normalize(); }
/// sets origin and direction.
inline void Set( const PointType & ori, const PointType & dir )
{ SetOrigin(ori); SetDirection(dir); }
//@}
//@{
/** @name Constructors
**/
/// The empty constructor
Line3() {};
/// The (origin, direction) constructor
Line3(const PointType &ori, const PointType &dir) {SetOrigin(ori); SetDirection(dir);};
//@}
/// Operator to compare two lines
inline bool operator == ( LineType const & p ) const
{ return _ori==p._ori && _dir==p._dir; }
/// Operator to dispare two lines
inline bool operator != ( LineType const & p ) const
{ return _ori!=p._ori || _dir!=p._dir; }
/// Projects a point on the line
inline ScalarType Projection( const PointType &p ) const
{ if (NORM) return ScalarType((p-_ori)*_dir);
else return ScalarType((p-_ori)*_dir/_dir.SquaredNorm());
}
/// returns wheter this type is normalized or not
static bool IsNormalized() {return NORM;};
/// calculates the point of parameter t on the line.
inline PointType P( const ScalarType t ) const
{ return _ori + _dir * t; }
/// normalizes direction field (returns a Normalized Line)
inline Line3<ScalarType,true> &Normalize()
{ if (!NORM) _dir.Normalize(); return *((Line3<ScalarType,true>*)this);}
/// normalizes direction field (returns a Normalized Line) - static version
static Line3<ScalarType,true> &Normalize(LineType &p)
{ p.Normalize(); return *((Line3<ScalarType,true>*)(&p));}
/// importer for different line types (with any scalar type or normalization beaviour)
template <class Q, bool K>
inline void Import( const Line3<Q,K> & b )
{ _ori.Import( b.Origin() ); _dir.Import( b.Direction() );
if ((NORM) && (!K)) _dir.Normalize();
//printf("(=)%c->%c ",(!NORM)?'N':'n', NORM?'N':'n');
}
/// constructs a new line importing it from an existing one
template <class Q, bool K>
static LineType Construct( const Line3<Q,K> & b )
{ LineType res; res.Import(b); return res;
}
PointType ClosestPoint(const PointType & p) const{
return P(Projection(p));
}
/// flips the line
inline void Flip(){
_dir=-_dir;
};
//@{
/** @name Linearity for 3d lines
(operators +, -, *, /) so a line can be set as a linear combination
of several lines. Note that the result of any operation returns
a non-normalized line; however, the command r0 = r1*a + r2*b is licit
even if r0,r1,r2 are normalized lines, as the normalization will
take place within the final assignement operation.
**/
inline Line3<ScalarType,false> operator + ( LineType const & p) const
{return Line3<ScalarType,false> ( _ori+p.Origin(), _dir+p.Direction() );}
inline Line3<ScalarType,false> operator - ( LineType const & p) const
{return Line3<ScalarType,false> ( _ori-p.Origin(), _dir-p.Direction() );}
inline Line3<ScalarType,false> operator * ( const ScalarType s ) const
{return Line3<ScalarType,false> ( _ori*s, _dir*s );}
inline Line3<ScalarType,false> operator / ( const ScalarType s ) const
{ScalarType s0=((ScalarType)1.0)/s; return LineType( _ori*s0, _dir*s0 );}
//@}
//@{
/** @name Automatic normalized to non-normalized
"Line3dN r0 = r1" is equivalent to
"Line3dN r0 = r1.Normalize()" if r1 is a Line3d
**/
/// copy constructor that takes opposite beaviour
Line3 (const Line3<ScalarType,!NORM > &r)
{ Import(r); };
/// assignment
inline LineType & operator = ( Line3<ScalarType,!NORM> const &r)
{ Import(r); return *this; };
//@}
}; // end class definition
typedef Line3<short> Line3s;
typedef Line3<int> Line3i;
typedef Line3<float> Line3f;
typedef Line3<double> Line3d;
typedef Line3<short ,true> Line3sN;
typedef Line3<int ,true> Line3iN;
typedef Line3<float ,true> Line3fN;
typedef Line3<double,true> Line3dN;
/// returns closest point
template <class ScalarType, bool NORM>
Point3<ScalarType> ClosestPoint( Line3<ScalarType,NORM> l, const Point3<ScalarType> & p)
{
return l.P(l.Projection(p));
}
template <class ScalarType, bool NORM>
ScalarType Distance(const Line3<ScalarType, NORM> &l,
const Point3<ScalarType> &p) {
Point3<ScalarType> o = l.ClosestPoint(p);
return (o - p).Norm();
}
/*@}*/
} // end namespace
#endif