214 lines
7.6 KiB
C++
214 lines
7.6 KiB
C++
/****************************************************************************
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* VCGLib o o *
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* Visual and Computer Graphics Library o o *
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* _ O _ *
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* Copyright(C) 2004-2016 \/)\/ *
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* Visual Computing Lab /\/| *
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* ISTI - Italian National Research Council | *
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* \ *
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* All rights reserved. *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
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* for more details. *
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* *
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****************************************************************************/
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/****************************************************************************
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History
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****************************************************************************/
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#ifndef __VCGLIB_LINE2
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#define __VCGLIB_LINE2
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#include <vcg/space/point2.h>
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namespace vcg {
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/** \addtogroup space */
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/*@{*/
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/**
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Templated class for 2D lines.
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This is the class for infinite lines in 3D space. A Line is stored just as two Point2:
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an origin and a direction (not necessarily normalized).
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@param LineScalarType (template parameter) Specifies the type of scalar used to represent coords.
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@param NORM: if on, the direction is always Normalized
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*/
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template <class LineScalarType, bool NORM=false>
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class Line2
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{
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public:
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/// The scalar type
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typedef LineScalarType ScalarType;
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/// The point type
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typedef Point2<LineScalarType> PointType;
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/// The line type
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typedef Line2<LineScalarType,NORM> LineType;
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private:
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/// Origin
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PointType _ori;
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/// Direction (not necessarily normalized, unless so specified by NORM)
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PointType _dir;
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public:
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//@{
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/** @name Members to access the origin or direction
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Direction() cannot be assigned directly.
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Use SetDirection() or Set() instead.
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**/
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///
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inline const PointType &Origin() const { return _ori; }
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inline PointType &Origin() { return _ori; }
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inline const PointType &Direction() const { return _dir; }
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/// sets the origin
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inline void SetOrigin( const PointType & ori )
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{ _ori=ori; }
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/// sets the direction
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inline void SetDirection( const PointType & dir)
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{ _dir=dir; if (NORM) _dir.Normalize(); }
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/// sets origin and direction.
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inline void Set( const PointType & ori, const PointType & dir )
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{ SetOrigin(ori); SetDirection(dir); }
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//@}
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//@{
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/** @name Constructors
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**/
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/// The empty constructor
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Line2() {};
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/// The (origin, direction) constructor
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Line2(const PointType &ori, const PointType &dir) {SetOrigin(ori); SetDirection(dir);};
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//@}
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/// Operator to compare two lines
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inline bool operator == ( LineType const & p ) const
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{ return _ori==p._ori && _dir==p._dir; }
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/// Operator to dispare two lines
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inline bool operator != ( LineType const & p ) const
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{ return _ori!=p._ori || _dir!=p._dir; }
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/// Projects a point on the line
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inline ScalarType Projection( const PointType &p ) const
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{ if (NORM) return ScalarType((p-_ori).dot(_dir));
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else return ScalarType((p-_ori).dot(_dir)/_dir.SquaredNorm());
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}
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/// returns whether this type is normalized or not
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static bool IsNormalized() {return NORM;};
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/// calculates the point of parameter t on the line.
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inline PointType P( const ScalarType t ) const
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{ return _ori + _dir * t; }
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/// normalizes direction field (returns a Normalized Line)
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inline Line2<ScalarType,true> &Normalize()
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{ if (!NORM) _dir.Normalize(); return *((Line2<ScalarType,true>*)this);}
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/// normalizes direction field (returns a Normalized Line) - static version
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static Line2<ScalarType,true> &Normalize(LineType &p)
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{ p.Normalize(); return *((Line2<ScalarType,true>*)(&p));}
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/// importer for different line types (with any scalar type or normalization beaviour)
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template <class Q, bool K>
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inline void Import( const Line2<Q,K> & b )
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{ _ori.Import( b.Origin() ); _dir.Import( b.Direction() );
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if ((NORM) && (!K)) _dir.Normalize();
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//printf("(=)%c->%c ",(!NORM)?'N':'n', NORM?'N':'n');
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}
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/// constructs a new line importing it from an existing one
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template <class Q, bool K>
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static LineType Construct( const Line2<Q,K> & b )
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{ LineType res; res.Import(b); return res;
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}
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PointType ClosestPoint(const PointType & p) const{
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return P(Projection(p));
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}
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/// flips the line
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inline void Flip(){
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_dir=-_dir;
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};
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//@{
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/** @name Linearity for 3d lines
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(operators +, -, *, /) so a line can be set as a linear combination
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of several lines. Note that the result of any operation returns
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a non-normalized line; however, the command r0 = r1*a + r2*b is licit
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even if r0,r1,r2 are normalized lines, as the normalization will
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take place within the final assignement operation.
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**/
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inline Line2<ScalarType,false> operator + ( LineType const & p) const
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{return Line2<ScalarType,false> ( _ori+p.Origin(), _dir+p.Direction() );}
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inline Line2<ScalarType,false> operator - ( LineType const & p) const
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{return Line2<ScalarType,false> ( _ori-p.Origin(), _dir-p.Direction() );}
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inline Line2<ScalarType,false> operator * ( const ScalarType s ) const
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{return Line2<ScalarType,false> ( _ori*s, _dir*s );}
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inline Line2<ScalarType,false> operator / ( const ScalarType s ) const
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{ScalarType s0=((ScalarType)1.0)/s; return LineType( _ori*s0, _dir*s0 );}
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//@}
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//@{
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/** @name Automatic normalized to non-normalized
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"Line3dN r0 = r1" is equivalent to
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"Line3dN r0 = r1.Normalize()" if r1 is a Line3d
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**/
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/// copy constructor that takes opposite beaviour
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Line2 (const Line2<ScalarType,!NORM > &r)
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{ Import(r); };
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/// assignment
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inline LineType & operator = ( const Line2<ScalarType,!NORM> &r)
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{ Import(r); return *this; };
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//@}
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}; // end class definition
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typedef Line2<short> Line2s;
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typedef Line2<int> Line2i;
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typedef Line2<float> Line2f;
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typedef Line2<double> Line2d;
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typedef Line2<short ,true> Line2sN;
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typedef Line2<int ,true> Line2iN;
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typedef Line2<float ,true> Line2fN;
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typedef Line2<double,true> Line2dN;
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/// returns closest point
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template <class ScalarType, bool NORM>
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Point2<ScalarType> ClosestPoint( Line2<ScalarType,NORM> l, const Point2<ScalarType> & p)
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{
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return l.P(l.Projection(p));
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}
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template <class ScalarType, bool NORM>
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ScalarType Distance(const Line2<ScalarType, NORM> &l,
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const Point2<ScalarType> &p) {
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Point2<ScalarType> o = l.ClosestPoint(p);
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return (o - p).Norm();
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}
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template <class ScalarType, bool NORM>
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vcg::Point2<ScalarType> Mirror(const vcg::Line2<ScalarType, NORM> &l,
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const vcg::Point2<ScalarType> &p)
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{
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vcg::Point2<ScalarType> nearest=vcg::ClosestPoint<ScalarType,NORM>(l,p);
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vcg::Point2<ScalarType> dir=(nearest - p);
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nearest+=dir;
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return nearest;
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}
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/*@}*/
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} // end namespace
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#endif
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