122 lines
4.2 KiB
C
122 lines
4.2 KiB
C
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/****************************************************************************
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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 \/)\/ *
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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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$Log: not supported by cvs2svn $
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****************************************************************************/
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#ifndef __VCGLIB_RAY3
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#define __VCGLIB_RAY3
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#include <vcg/space/point3.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 3D ray.
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This is the class for a semi-line in 3D space. A ray is stored just as origin and direction (Point3).
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@param RayScalarType (template parameter) Specifies the type of scalar used to represent coords.
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*/
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template <class RayScalarType >
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class Ray3
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{
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public:
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/// The scalar type
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typedef RayScalarType ScalarType;
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/// The point type
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typedef Point3<RayScalarType> PointType;
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/// The point type
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typedef Ray3<RayScalarType> RayType;
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private:
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/// Origin
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PointType _ori;
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/// Direction (not necessarily normalized)
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PointType _dir;
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public:
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/// Members to access the origin, direction
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inline const PointType &Ori() const { return _ori; }
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inline const PointType &Dir() const { return _dir; }
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inline PointType &Ori() { return _ori; }
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inline PointType &Dir() { return _dir; }
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/// The empty constructor
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Ray3() {};
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/// The (a,b) constructor
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RayType(const PointType &a, const PointType &b) { _p0=a; _p1=b; };
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/// Operator to compare two rays
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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 rays
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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 ray (returns distance)
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/// projection exists iff result > 0
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inline ScalarType Projection( const PointType &p ) const
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{ ScalarType l = dire.SquaredNorm();
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return ScalarType((p-_ori)*_dir/l); }
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///set up of the line.
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void Set( const PointType & ori, const PointType & dir )
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{ _ori = ori; _dir=dir }
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/// calculates the point of parameter t on the ray.
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/// if t>0, point is on the ray
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inline PointType P( const ScalarType t ) const
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{ return orig + dire * t; }
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/// normalizes direction field
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LineType &Normalize()
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{ _dir.Normalize(); return *this;}
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static LineType &Normalize(LineType &p)
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{ p.Normalize(); return p;}
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/// importer for different Ray types
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template <class Q>
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inline void Import( const Ray3<Q> & b )
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{ _ori.Import( b._ori); _dir.Import( b._dir);
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}
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}; // end class definition
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typedef Ray3<short> Ray3s;
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typedef Ray3<int> Ray3i;
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typedef Ray3<float> Ray3f;
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typedef Ray3<double> Ray3d;
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/*@}*/
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} // end namespace
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#endif
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