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elementsignal.cpp

/***************************************************************************
 *   Copyright (C) 2003-2004 by David Saxton                               *
 *   david@bluehaze.org                                                    *
 *                                                                         *
 *   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.                                   *
 ***************************************************************************/

#include "elementsignal.h"
#include <cmath>

ElementSignal::ElementSignal()
{
      m_type = ElementSignal::st_sinusoidal;
      m_time = 0.;
      m_frequency = 0.;
}

ElementSignal::~ElementSignal()
{
}

void ElementSignal::setStep( double delta, Type type, double frequency )
{
      m_type = type;
      m_delta = delta;
      m_frequency = frequency;
      m_omega = 6.283185307179586*m_frequency;
      m_time = 1./(4.*m_frequency);
}

00034 double ElementSignal::advance()
{
      m_time += m_delta;
      if ( m_time >= 1./m_frequency ) m_time -= 1./m_frequency;
      
      switch (m_type)
      {
            case ElementSignal::st_sawtooth:
            {
                  // TODO Sawtooth signal
                  return 0.;
            }
            case ElementSignal::st_square:
            {
                  return (sin(m_time*m_omega)>=0)?1:-1;
            }
            case ElementSignal::st_triangular:
            {
                  // TODO Triangular signal
                  return 0.;
            }
            case ElementSignal::st_sinusoidal:
            default:
            {
                  return sin(m_time*m_omega);
            }
      }
}




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