gui/smlpcztrans.hh

/*
 * Copyright (C) 2010 Stefan Westerfeld
 *
 * 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 3 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 program.  If not, see <http://www.gnu.org/licenses/>.
 */


#ifndef SPECTMORPH_LPC_ZTRANS_HH
#define SPECTMORPH_LPC_ZTRANS_HH

#include <complex>
#include <vector>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "smlpc.hh"

namespace SpectMorph
{

struct LPCZFunction
{
  virtual double eval (std::complex<double> z) const = 0;
};

struct LPCZFunctionLPC : public LPCZFunction
{
  std::vector<double> a;

  LPCZFunctionLPC (const std::vector<double>& a)
    : a (a)
  {
  }
  double
  eval (std::complex<double> z) const
  {
    return LPC::eval_z (a, z);
  }
};


GdkPixbuf *lpc_z_transform (const LPCZFunction& zfunc, const std::vector< std::complex<double> >& roots);
GdkPixbuf *lpc_z_transform (const std::vector<double>& a, const std::vector< std::complex<double> >& roots);

}

#endif