1 files changed, 97 insertions, 0 deletions
diff --git a/src/volumefader.cc b/src/volumefader.cc
new file mode 100644
index 0000000..08bab80
--- /dev/null
+++ b/src/volumefader.cc
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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");
+}