mymoneyfinancialcalculator.h

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/***************************************************************************
                          mymoneyfinancialcalculator.h  -  description
                             -------------------
    begin                : Tue Oct 21 2003
    copyright            : (C) 2000-2003 by Michael Edwardes
    email                : mte@users.sourceforge.net
                           Javier Campos Morales <javi_c@users.sourceforge.net>
                           Felix Rodriguez <frodriguez@users.sourceforge.net>
                           John C <thetacoturtle@users.sourceforge.net>
                           Thomas Baumgart <ipwizard@users.sourceforge.net>
                           Kevin Tambascio <ktambascio@users.sourceforge.net>
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef MYMONEYFINANCIALCALCULATOR_H
#define MYMONEYFINANCIALCALCULATOR_H

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <cmath>
// ----------------------------------------------------------------------------
// QT Includes

// ----------------------------------------------------------------------------
// KDE Includes

// ----------------------------------------------------------------------------
// Project Includes

#include <kmymoney/export.h>

#ifdef _GLIBCPP_HAVE_MODFL
#define HAVE_LONG_DOUBLE  1
#endif

#ifndef HAVE_LONG_DOUBLE
#define HAVE_LONG_DOUBLE  0
#endif

#if HAVE_LONG_DOUBLE
#define FCALC_DOUBLE  long double
#else
#define FCALC_DOUBLE  double
#define modfl(a,b)    modf(a,b)
#define roundl(a)     round(a)
#define powl(a,b)     pow(a,b)
#define expl(a)       exp(a)
#define logl(a)       log(a)
#define floorl(a)     floor(a)
#define fabsl(a)      fabs(a)
#endif

class KMYMONEY_EXPORT MyMoneyFinancialCalculator
{
public:
  MyMoneyFinancialCalculator();
  ~MyMoneyFinancialCalculator();

  FCALC_DOUBLE numPayments();

  FCALC_DOUBLE payment();

  FCALC_DOUBLE presentValue();

  FCALC_DOUBLE futureValue();

  FCALC_DOUBLE interestRate();

  FCALC_DOUBLE interestDue(void) const;

  void setPrec(const unsigned short prec = 2);

  void setNpp(const FCALC_DOUBLE npp);

  FCALC_DOUBLE npp(void) const { return m_npp; };

  void setPF(const unsigned short PF = 12);

  void setCF(const unsigned short CF = 12);

  void setBep(const bool bep = false);

  void setDisc(const bool disc = true);

  void setIr(const FCALC_DOUBLE ir);

  FCALC_DOUBLE ir(void) const { return m_ir; };

  void setPv(const FCALC_DOUBLE pv);

  FCALC_DOUBLE pv(void) const { return m_pv; };

  void setPmt(const FCALC_DOUBLE pmt);

  FCALC_DOUBLE pmt(void) const { return m_pmt; };

  void setFv(const FCALC_DOUBLE fv);

  FCALC_DOUBLE fv(void) const { return m_fv; };

private:
  FCALC_DOUBLE eff_int(void) const;
  FCALC_DOUBLE nom_int(const FCALC_DOUBLE eint) const;
  FCALC_DOUBLE rnd(const FCALC_DOUBLE x) const;

  FCALC_DOUBLE _Ax(const FCALC_DOUBLE eint) const;
  FCALC_DOUBLE _Bx(const FCALC_DOUBLE eint) const;
  FCALC_DOUBLE _Cx(const FCALC_DOUBLE eint) const;
  FCALC_DOUBLE _fi(const FCALC_DOUBLE eint) const;
  FCALC_DOUBLE _fip(const FCALC_DOUBLE eint) const;

private:
  FCALC_DOUBLE          m_ir;   // nominal interest rate
  FCALC_DOUBLE          m_pv;   // present value
  FCALC_DOUBLE          m_pmt;  // periodic payment
  FCALC_DOUBLE          m_fv;   // future value
  FCALC_DOUBLE          m_npp;  // number of payment periods

  unsigned short        m_CF;   // compounding frequency
  unsigned short        m_PF;   // payment frequency

  unsigned short        m_prec; // precision for roundoff for pv, pmt and fv
                                // i is not rounded, n is integer

  bool                  m_bep;  // beginning/end of period payment flag
  bool                  m_disc; // discrete/continous compounding flag

  unsigned short        m_mask; // available value mask
  #define PV_SET        0x0001
  #define IR_SET        0x0002
  #define PMT_SET       0x0004
  #define NPP_SET       0x0008
  #define FV_SET        0x0010
};

#endif