glplane.h

/***************************************************************************
                          glplane.h  -  description
                             -------------------
    begin                : Wed Aug 20 2003
    copyright            : (C) 2003 by Jacques Gasselin de Richebourg
    email                : jacquesgasselin@hotmail.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU Lesser General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef GLPLANE_H
#define GLPLANE_H

#include "glvector.h"
class GLPlane
{
   GLVector normal;
   GLfloat D;
public: 

   GLPlane() { normal.set(0,0,0); D = 0; };
   GLPlane(GLVector n, GLVector op);
   GLPlane(GLVector op1, GLVector op2, GLVector op3);

   inline void set( GLVector n, GLVector op)
   { normal = n; D = -(normal.dot(op)); }

   inline void set( const GLVector& op1, const GLVector& op2, const GLVector& op3 )
   { normal = (op3 - op2).getCross( (op1 - op2) );  normal.normalize(); D = -(normal.dot(op1)); }

   const GLVector& getNormal(void) const
   { return normal; }
   
   inline void setNormal(const GLVector& n)
   { normal = n; }

   GLfloat distanceToPoint(const GLVector& p) const;
   GLfloat intersectionWithLine(GLVector dir, GLVector origin) const;
   GLVector reflectedVector(GLVector& in) const;
   
    ~GLPlane();
};

#endif

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