/*
 *   Imp for the cepWindowAlg.cpp
 *
 *   Copyright (C) Blake Swadling                   2002
 *
 *   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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

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

/** calculate a single global value of PI */
const double
  cepWindowAlg::PI =
  4.0 *
atan (1.0);

cepWindowAlg::cepWindowAlg (int s)
{
  size = s;
  coeffs = NULL;
}

cepWindowAlg::~cepWindowAlg ()
{
}

int
cepWindowAlg::getSize ()
{
  return size;
}


void
cepWindowAlg::initCoeffs ()
{
  if (coeffs != NULL)
    delete coeffs;
  coeffs = generateCoeffs (getSize ());
}


const cepMatrix < double >
cepWindowAlg::getCoeffs ()
{

  if (coeffs == NULL)
    {
      coeffs = generateCoeffs (1);
    }
  return *coeffs;
}


cepMatrix < double >*
cepWindowAlg::generateCoeffs (int size)
{
  cepMatrix < double >*foo = new cepMatrix < double >(size, 1);
  for (int i = 0; i < size; i++)
    {

      double val = getValue (i);
      if (isnan (val))
	{
	  delete foo;
	  return new cepMatrix < double >(0, 0);
	}

      foo->setValue (i, 0, val);
    }
  return foo;
}