---

Plane.cpp

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/*
    TEDDY - General graphics application library
    Copyright (C) 1999-2002  Timo Suoranta
    tksuoran@cc.helsinki.fi

    This library 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 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    $Id: Plane.cpp,v 1.5 2002/01/22 19:30:05 tksuoran Exp $
*/


#include "Teddy/Maths/Plane.h"
#include "Teddy/SysSupport/StdIO.h"


namespace Teddy {
namespace Maths {


/*
Plane::Plane( const Vector &p1, const Vector &p2, const Vector &p3 ){
    *this = (p1-p2) * (p1-p3);
    this->Norm();
    d = -( r*p1.r + s*p1.s + t*p1.t );
} */


double Plane::distance( const Vector &p ) const {
    return( v[0]*p.v[0] + v[1]*p.v[1] + v[2]*p.v[2] + v[3] );
}


void Plane::neg(){
    v[0] = -v[0];
    v[1] = -v[1];
    v[2] = -v[2];
    v[3] = -v[3];
}



Vector Plane::getNormal() const {
    return Vector( v[0], v[1], v[2] );
}


double Plane::getConstant() const {
    return v[3];
}

Plane &Plane::operator=( const Vector &vec ){
    v[0] = vec.v[0];
    v[1] = vec.v[1];
    v[2] = vec.v[2]; 
    return( *this );
}

Plane &Plane::operator=( const Vector4 &vec ){
    v[0] = vec.v[0];
    v[1] = vec.v[1];
    v[2] = vec.v[2]; 
    v[3] = vec.v[3]; 
    return( *this );
}


};  //  namespace Maths
};  //  namespace Teddy