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