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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* volumefader.cc
*
* Tue Apr 15 15:46:00 CEST 2014
* Copyright 2014 Jonas Suhr Christensen
* jsc@umbraculum.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "volumefader.h"
#include <QSlider>
#include <QVBoxLayout>
#include <math.h>
#define SCALAR 10
#define P 0.5
VolumeFader::VolumeFader()
{
peak = 0;
volslider = new QSlider();
volslider->setRange(-60 * SCALAR , 10 * SCALAR);
volslider->setOrientation(Qt::Horizontal);
volumepeak = new QLabel();
volume = new QLabel();
connect(volslider, SIGNAL(valueChanged(int)), this, SLOT(handleValueChanged()));
QVBoxLayout* lo = new QVBoxLayout();
lo->addWidget(volslider);
lo->addWidget(volumepeak);
lo->addWidget(volume);
setLayout(lo);
}
VolumeFader::~VolumeFader()
{
}
void VolumeFader::updatePeakDb(double db)
{
// updatePeakPower(pow(10, db/20));
}
void VolumeFader::updatePeakPower(double newpeak)
{
peak = (newpeak * (1.0-P) + peak * P);
volumepeak->setText("Peak " + QString::number(peak, 'f', 5));
handleValueChanged();
}
void VolumeFader::setVolumeDb(double db)
{
volslider->setValue(db*SCALAR);
handleValueChanged();
}
void VolumeFader::setVolumePower(double power)
{
double db = 20 * log10(power);
setVolumeDb(db);
handleValueChanged();
}
void VolumeFader::handleValueChanged()
{
double db = ((double)volslider->value())/((double)SCALAR);
double power = pow(10, db/20);
emit volumeChangedDb(db);
emit volumeChangedPower(power);
volume->setText("Gain " + QString::number(volslider->value()/SCALAR) + " dB");
}
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