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/*
**************************************************************************
description
--------------------
copyright : (C) 2000-2001 by Andreas Zehender
email : zehender@kde.org
**************************************************************************
**************************************************************************
* *
* 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. *
* *
**************************************************************************/
#include "pmpoint.h"
#include "pmvector.h"
#include "pmmatrix.h"
#include "pmmath.h"
PMPoint::PMPoint( )
{
m_coord[0] = 0;
m_coord[1] = 0;
m_coord[2] = 0;
}
PMPoint::PMPoint( GLdouble x, GLdouble y, GLdouble z )
{
m_coord[0] = x;
m_coord[1] = y;
m_coord[2] = z;
}
PMPoint::PMPoint( const PMVector& v )
{
if( v.size( ) == 3 )
{
m_coord[0] = v[0];
m_coord[1] = v[1];
m_coord[2] = v[2];
}
else
{
m_coord[0] = 0;
m_coord[1] = 0;
m_coord[2] = 0;
}
}
PMPoint::PMPoint( const PMPoint& p )
{
m_coord[0] = p.m_coord[0];
m_coord[1] = p.m_coord[1];
m_coord[2] = p.m_coord[2];
}
PMPoint& PMPoint::operator= ( const PMPoint& p )
{
m_coord[0] = p.m_coord[0];
m_coord[1] = p.m_coord[1];
m_coord[2] = p.m_coord[2];
return *this;
}
void PMPoint::transform( const PMMatrix& m )
{
(*this) = m * (*this);
}
PMPoint operator* ( const PMMatrix& m, const PMPoint& p )
{
PMPoint result;
int c, i;
// for homogenous coordinates
double u;
for( c = 0; c < 3; c++ )
{
result.m_coord[c] = 0.0;
for( i = 0; i < 4; i++ )
result.m_coord[c] += m[i][c] * ( i<3 ? p[i] : 1.0 );
}
u = 0.0;
for( i = 0; i < 4; i++ )
u += m[i][3] * ( i<3 ? p[i] : 1.0 );
if( !approxZero( u ) )
for( i = 0; i < 3; i++ )
result.m_coord[i] /= u;
return result;
}
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