/* -*- c++ -*- */

/*

 * Copyright 2003,2008 Free Software Foundation, Inc.

 * 

 * This file is part of GNU Radio

 * 

 * GNU Radio 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 3, or (at your option)

 * any later version.

 * 

 * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street,

 * Boston, MA 02110-1301, USA.

 */

#ifndef _GR_ROTATOR_H_

#define _GR_ROTATOR_H_

#include <gr_core_api.h>

#include <gr_complex.h>

class GR_CORE_API gr_rotator {

  gr_complex        d_phase;

  gr_complex        d_phase_incr;

  unsigned int        d_counter;

 public:

  gr_rotator () : d_phase (1), d_phase_incr (1), d_counter(0) { }

  void set_phase (gr_complex phase)     { d_phase = phase / abs(phase); }

  void set_phase_incr (gr_complex incr) { d_phase_incr = incr / abs(incr); }

  gr_complex rotate (gr_complex in){

    d_counter++;

    gr_complex z = in * d_phase;    // rotate in by phase

    d_phase *= d_phase_incr;            // incr our phase (complex mult == add phases)

    if ((d_counter % 512) == 0)

      d_phase /= abs(d_phase);            // Normalize to ensure multiplication is rotation

    return z;

  }

};

#endif /* _GR_ROTATOR_H_ */