---

Torus.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: Torus.cpp,v 1.5 2002/02/16 12:41:39 tksuoran Exp $
*/


#include "Teddy/Maths/Vector.h"
#include "Teddy/Models/QuadStrip.h"
#include "Teddy/Models/Torus.h"
#include "Teddy/Models/Vertex.h"
#include "Teddy/SysSupport/StdMaths.h"


namespace Teddy  {
namespace Models {


Torus::Torus(
    const std::string &name,
    const double       major_radius,
    const double       minor_radius,
    const int          stacks,
    const int          slices
):Model( name ){
    int    i;
    int    j;
    int    k;
    double s;
    double t;
    double x;
    double y;
    double z;

    double cp = M_2_PI/(double)stacks;
    double tp = M_2_PI/(double)slices;

    for( i=0; i<stacks; i++ ){
        QuadStrip *qs = new QuadStrip();
        for( j=0; j<=slices; j++ ){
            for( k=0; k<2; k++ ){
                s = (i + k) % stacks + 0.5;
                t = j % slices;

                x = (major_radius + minor_radius * cos(s*cp)) * cos(t*tp);
                y = (major_radius + minor_radius * cos(s*cp)) * sin(t*tp);
                z = minor_radius * sin(s*cp);
                Vertex *v = new Vertex( x, y, z );

                x = cos(t*tp) * cos(s*cp);
                y = sin(t*tp) * cos(s*cp);
                z = sin(s*cp);
                v->setNormal( Vector( x, y, z ) );
                qs->add( v );
            }
        }
        add( qs );
    }

    setupClipRadius();
}


};  //  namespace Models
};  //  namespace Teddy