1 /* 2 * Copyright 2003-2012 Thomas Baumgart <tbaumgart@kde.org> 3 * Copyright 2017-2018 Łukasz Wojniłowicz <lukasz.wojnilowicz@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of 8 * the License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #ifndef MYMONEYFINANCIALCALCULATOR_P_H 20 #define MYMONEYFINANCIALCALCULATOR_P_H 21 22 #include "mymoneyfinancialcalculator.h" 23 24 #include <qglobal.h> 25 26 // ---------------------------------------------------------------------------- 27 // QT Includes 28 29 #include <QString> 30 31 // ---------------------------------------------------------------------------- 32 // KDE Includes 33 34 // ---------------------------------------------------------------------------- 35 // Project Includes 36 37 #include "mymoneyexception.h" 38 39 class MyMoneyFinancialCalculatorPrivate 40 { Q_DISABLE_COPY(MyMoneyFinancialCalculatorPrivate)41 Q_DISABLE_COPY(MyMoneyFinancialCalculatorPrivate) 42 43 public: 44 45 MyMoneyFinancialCalculatorPrivate() : 46 m_ir(0.0), 47 m_pv(0.0), 48 m_pmt(0.0), 49 m_fv(0.0), 50 m_npp(0.0), 51 m_CF(0), 52 m_PF(0), 53 m_prec(2), 54 m_bep(false), 55 m_disc(false), 56 m_mask(0) 57 { 58 } 59 _fi(const double eint)60 double _fi(const double eint) const 61 { 62 return _Ax(eint) *(m_pv + _Cx(eint)) + m_pv + m_fv; 63 } 64 _fip(const double eint)65 double _fip(const double eint) const 66 { 67 double AA = _Ax(eint); 68 double CC = _Cx(eint); 69 double D = (AA + 1.0) / (eint + 1.0); 70 71 return m_npp *(m_pv + CC) * D - (AA * CC) / eint; 72 } 73 _Ax(const double eint)74 double _Ax(const double eint) const 75 { 76 return pow((eint + 1.0), m_npp) - 1.0; 77 } 78 _Bx(const double eint)79 double _Bx(const double eint) const 80 { 81 if (eint == 0.0) 82 throw MYMONEYEXCEPTION_CSTRING("Zero interest"); 83 84 if (m_bep == false) 85 return static_cast<double>(1.0) / eint; 86 87 return (eint + 1.0) / eint; 88 } 89 _Cx(const double eint)90 double _Cx(const double eint) const 91 { 92 return m_pmt * _Bx(eint); 93 } 94 eff_int()95 double eff_int() const 96 { 97 double nint = m_ir / 100.0; 98 double eint; 99 100 if (m_disc) { // periodically compound? 101 if (m_CF == m_PF) { // same frequency? 102 eint = nint / static_cast<double>(m_CF); 103 104 } else { 105 eint = pow((static_cast<double>(1.0) + (nint / static_cast<double>(m_CF))), 106 (static_cast<double>(m_CF) / static_cast<double>(m_PF))) - 1.0; 107 108 } 109 110 } else { 111 eint = exp(nint / static_cast<double>(m_PF)) - 1.0; 112 } 113 114 return eint; 115 } 116 nom_int(const double eint)117 double nom_int(const double eint) const 118 { 119 double nint; 120 121 if (m_disc) { 122 if (m_CF == m_PF) { 123 nint = m_CF * eint; 124 125 } else { 126 nint = m_CF * (pow((eint + 1.0), (static_cast<double>(m_PF) / static_cast<double>(m_CF))) - 1.0); 127 } 128 } else 129 nint = log(pow(eint + 1.0, m_PF)); 130 131 return nint; 132 } 133 rnd(const double x)134 double rnd(const double x) const 135 { 136 double r, f; 137 138 if (m_prec > 0) { 139 f = pow(10.0, m_prec); 140 r = static_cast<double>(qRound64(x * f) / f); 141 } else { 142 r = static_cast<double>(qRound64(x)); 143 } 144 return r; 145 } 146 147 double m_ir; // nominal interest rate 148 double m_pv; // present value 149 double m_pmt; // periodic payment 150 double m_fv; // future value 151 double m_npp; // number of payment periods 152 153 unsigned short m_CF; // compounding frequency 154 unsigned short m_PF; // payment frequency 155 156 unsigned short m_prec; // precision for roundoff for pv, pmt and fv 157 // i is not rounded, n is integer 158 159 bool m_bep; // beginning/end of period payment flag 160 bool m_disc; // discrete/continuous compounding flag 161 162 unsigned short m_mask; // available value mask 163 164 }; 165 166 #endif 167 168