piano.cpp

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/*****************************************************************************
 * Copyright 2015 Haye Hinrichsen, Christoph Wick
 *
 * This file is part of Entropy Piano Tuner.
 *
 * Entropy Piano Tuner 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 3 of the License, or (at your
 * option) any later version.
 *
 * Entropy Piano Tuner 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
 * Entropy Piano Tuner. If not, see http://www.gnu.org/licenses/.
 *****************************************************************************/

//=============================================================================
//                                Piano class
//=============================================================================

#include "piano.h"

#include <cmath>
#include <ctime>

#include "../system/eptexception.h"

const int    Piano::DEFAULT_NUMBER_OF_KEYS = 88;
const int    Piano::DEFAULT_KEY_NUMBER_OF_A = 48;
const int    Piano::DEFAULT_KEYS_ON_BASS_BRIDGE = 28;
const double Piano::DEFAULT_CONCERT_PITCH = 440;


//-----------------------------------------------------------------------------
//                                  Constructor
//-----------------------------------------------------------------------------


Piano::Piano() :
    mName(""),
    mType(piano::PT_GRAND),
    mSerialNumber(""),
    mManufactureYear(""),
    mManufactureLocation(""),
    mTuningLocation(""),
    mTuningTime(""),
    mConcertPitch(DEFAULT_CONCERT_PITCH),
    mKeyboard(DEFAULT_NUMBER_OF_KEYS)
{
    setTuningTimeToActualTime(); // Set current time as tuning time
}



//-----------------------------------------------------------------------------
//                       set tuning time to actual time
//-----------------------------------------------------------------------------


void Piano::setTuningTimeToActualTime()
{
    time_t rawtime = time(0);
    struct tm nowtime;
#ifdef _MSC_VER
    gmtime_s(&nowtime, &rawtime);
#else
    nowtime = *gmtime(&rawtime);
#endif
    char buffer[50];
    strftime(buffer, 50, "%Y-%m-%d %H:%M:%S", &nowtime);
    mTuningTime = buffer;
}


//-----------------------------------------------------------------------------
//                       Set tuning time to actual time
//-----------------------------------------------------------------------------


double Piano::getExpectedInharmonicity (double f) const
{
    return (f > 100 ? exp(-15.45 + 1.354*log(f)) : exp(-2.622 - 1.431*log(f)));
}


//-----------------------------------------------------------------------------
//                             Equal temperament
//-----------------------------------------------------------------------------


double Piano::getEqualTempFrequency (int keynumber, double cents, double A4) const
{
    EptAssert(keynumber>=0 and keynumber < mKeyboard.getNumberOfKeys(),"range of keynumber");
    return (A4>0 ? A4 : mConcertPitch) *
            pow(2.0, (100.0*(keynumber-mKeyboard.getKeyNumberOfA4())+cents)/1200.0);
}


//-----------------------------------------------------------------------------
//                         define the temperament
//-----------------------------------------------------------------------------


double Piano::getDefiningTempFrequency (int keynumber, double cents, double A4) const
{
    EptAssert(keynumber>=0 and keynumber < mKeyboard.getNumberOfKeys(),"range of keynumber");
    return getEqualTempFrequency(keynumber,cents,A4);
}