---

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


#include "Teddy/Models/Sphere.h"
#include "Teddy/Models/QuadStrip.h"
#include "Teddy/Models/Vertex.h"
#include "Teddy/SysSupport/StdMaths.h"


namespace Teddy  {
namespace Models {


Sphere::Sphere(
    const std::string &name,
    const double       rad,
    const int          stacks,
    const int          slices
)
:
Model ( name   ),
radius( rad    ),
stacks( stacks ),
slices( slices )
{
    double r;
    double x;
    double y;
    double z;
    int    i;
    int    j;
    int    k;

    for( j=0; j<stacks; j++ ){
        QuadStrip *qs = new QuadStrip();
        for( i=0; i<slices+1; i++ ){
            for( k=1; k>=0; k-- ){
                z = radius*cos( (j+k)*M_PI/stacks );
                r = radius*sin( (j+k)*M_PI/stacks );
                x = r*cos( i*M_2_PI/slices );
                y = r*sin( i*M_2_PI/slices );
                Vector normal = Vector( x, y, z );
                normal.normalize();
                double  s        = 1 - (double)(   i   ) / (double)( stacks );
                double  t        =     (double)( (j+k) ) / (double)( slices );
                Vertex *v        = new Vertex( x, y, z );
                v->setNormal ( normal );
                v->setTexture( s, t, 0.0f );
                qs->add( v );
            }
        }
        add( qs );
    }

    setupClipRadius();
}


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