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Roessler.h

/*
      dsp/Roessler.h
      
      Copyright 2003-4 Tim Goetze <tim@quitte.de>
      
      http://quitte.de/dsp/

      Roessler fractal.

*/
/*
      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.

      This program 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 General Public License for more details.

      You should have received a copy of the GNU General Public License
      along with this program; if not, write to the Free Software
      Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
      02111-1307, USA or point your web browser to http://www.gnu.org.
*/

#ifndef _DSP_ROESSLER_H_
#define _DSP_ROESSLER_H_

namespace DSP {

class Roessler
{
      public:
            double x[2], y[2], z[2];      
            double h, a, b, c;
            int I;

      public:
            Roessler()
                  {
                        h = 0.001;
                        a = .2;
                        b = .2;
                        c = 5.7;
                  }

            /* rate is normalized (0 .. 1) */
            void set_rate (double r)
                  {
                        h = max (.000001, r * .096);
                  }

            void init (double _h = .001, double seed = .0)
                  {
                        h = _h;

                        I = 0;

                        x[0] = .0001 + .0001 * seed;
                        y[0] = .0001;
                        z[0] = .0001;

                        for (int i = 0; i < 1000; ++i)
                              get();
                  }

            d_sample get()
                  {
                        int J = I ^ 1;

                        x[J] = x[I] + h * (- y[I] - z[I]);
                        y[J] = y[I] + h * (x[I] + a * y[I]);
                        z[J] = z[I] + h * (b + z[I] * (x[I] - c));

                        I = J;

                        return x[I] * .01725 + z[I] * .015;
                  }

            double get_x()
                  {
                        return x[I];
                  }

            double get_y()
                  {
                        return y[I];
                  }

            double get_z()
                  {
                        return z[I];
                  }
};

} /* namespace DSP */

#endif /* _DSP_ROESSLER_H_ */

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