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f4c2939253
* Include only what is used * Use forward declaration when possible * Sorted includes refs #598
114 lines
3.3 KiB
C++
114 lines
3.3 KiB
C++
/* Copyright (C) 2015
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* swift project Community / Contributors
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*
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* This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
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* directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
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* including this file, may be copied, modified, propagated, or distributed except according to the terms
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* contained in the LICENSE file.
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*
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* Class based on qt example: Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
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*/
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#include "blackgui/levelmeter.h"
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#include <math.h>
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#include <QPainter>
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#include <QRect>
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#include <QSizePolicy>
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#include <QTimer>
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#include <Qt>
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#include <QtGlobal>
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namespace BlackGui
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{
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CLevelMeter::CLevelMeter(QWidget *parent)
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: QWidget(parent)
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, m_peakDecayRate(PeakDecayRate)
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, m_redrawTimer(new QTimer(this))
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, m_rmsColor(Qt::red)
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, m_peakColor(255, 200, 200, 255)
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{
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setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
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setMinimumWidth(30);
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connect(m_redrawTimer, &QTimer::timeout, this, &CLevelMeter::ps_redrawTimerExpired);
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m_redrawTimer->start(RedrawInterval);
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m_redrawTimer->setObjectName("CLevelMeter");
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}
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CLevelMeter::~CLevelMeter()
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{ }
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void CLevelMeter::reset()
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{
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m_rmsLevel = 0.0;
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m_peakLevel = 0.0;
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update();
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}
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void CLevelMeter::levelChanged(double rmsLevel, double peakLevel, int numSamples)
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{
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// Smooth the RMS signal
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const double smooth = pow(double(0.9), static_cast<double>(numSamples) / 256); // TODO: remove this magic number
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m_rmsLevel = (m_rmsLevel * smooth) + (rmsLevel * (1.0 - smooth));
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if (peakLevel > m_decayedPeakLevel)
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{
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m_peakLevel = peakLevel;
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m_decayedPeakLevel = peakLevel;
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m_peakLevelChanged.start();
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}
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if (peakLevel > m_peakHoldLevel)
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{
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m_peakHoldLevel = peakLevel;
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m_peakHoldLevelChanged.start();
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}
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update();
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}
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void CLevelMeter::ps_redrawTimerExpired()
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{
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// Decay the peak signal
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const int elapsedMs = m_peakLevelChanged.elapsed();
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const double decayAmount = m_peakDecayRate * elapsedMs;
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if (decayAmount < m_peakLevel)
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{
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m_decayedPeakLevel = m_peakLevel - decayAmount;
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}
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else
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{
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m_decayedPeakLevel = 0.0;
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}
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// Check whether to clear the peak hold level
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if (m_peakHoldLevelChanged.elapsed() > PeakHoldLevelDuration)
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m_peakHoldLevel = 0.0;
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update();
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}
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void CLevelMeter::paintEvent(QPaintEvent *event)
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{
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Q_UNUSED(event)
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QPainter painter(this);
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painter.fillRect(rect(), Qt::black);
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QRect bar = rect();
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bar.setTop(rect().top() + (1.0 - m_peakHoldLevel) * rect().height());
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bar.setBottom(bar.top() + 5);
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painter.fillRect(bar, m_rmsColor);
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bar.setBottom(rect().bottom());
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bar.setTop(rect().top() + (1.0 - m_decayedPeakLevel) * rect().height());
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painter.fillRect(bar, m_peakColor);
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bar.setTop(rect().top() + (1.0 - m_rmsLevel) * rect().height());
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painter.fillRect(bar, m_rmsColor);
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}
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} // namespace
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