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sdrangel/sdrgui/gui/levelmeter.cpp

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C++
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///////////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016-2019 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// //
// This program 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 as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////////
/****************************************************************************
* Copyright (C) 2016 Edouard Griffiths, F4EXB
* Modifications made to:
* - use the widget horizontally
* - differentiate each area with a different color
* - allow overload by 25% with indication of 100% threshold and overload
* - make it generic to fit many cases: VU, signal strength ...
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "gui/levelmeter.h"
#include <math.h>
#include <QPainter>
#include <QTimer>
#include <QDebug>
// Constants
const int RedrawInterval = 100; // ms
const qreal PeakDecayRate = 0.001;
const int PeakHoldLevelDuration = 2000; // ms
LevelMeter::LevelMeter(QWidget *parent)
: QWidget(parent)
, m_avgLevel(0.0)
, m_peakLevel(0.0)
, m_decayedPeakLevel(0.0)
, m_peakDecayRate(PeakDecayRate)
, m_peakHoldLevel(0.0)
, m_avgSmoothing(256)
, m_redrawTimer(new QTimer(this))
, m_avgColor(0xff, 0x8b, 0x00, 128) // color mapper foreground
, m_peakColor(Qt::red) // just red 100% opaque
, m_decayedPeakColor(0x97, 0x54, 0x00, 128) // color mapper 59%
, m_backgroundPixmap(0)
{
setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred);
setMinimumWidth(30);
connect(m_redrawTimer, SIGNAL(timeout()), this, SLOT(redrawTimerExpired()));
m_redrawTimer->start(RedrawInterval);
}
LevelMeter::~LevelMeter()
{
if (m_backgroundPixmap) {
delete m_backgroundPixmap;
}
}
void LevelMeter::reset()
{
m_avgLevel = 0.0;
m_peakLevel = 0.0;
update();
}
void LevelMeter::levelChanged(qreal avgLevel, qreal peakLevel, int numSamples)
{
// Smooth the RMS signal
const qreal smooth = pow(qreal(0.9), static_cast<qreal>(numSamples) / m_avgSmoothing);
m_avgLevel = (m_avgLevel * smooth) + (avgLevel * (1.0 - smooth));
if (peakLevel > m_decayedPeakLevel) {
m_peakLevel = peakLevel;
m_decayedPeakLevel = peakLevel;
m_peakLevelChanged.start();
}
if (peakLevel > m_peakHoldLevel) {
m_peakHoldLevel = peakLevel;
m_peakHoldLevelChanged.start();
}
update();
}
void LevelMeter::redrawTimerExpired()
{
// Decay the peak signal
const int elapsedMs = m_peakLevelChanged.elapsed();
const qreal decayAmount = m_peakDecayRate * elapsedMs;
if (decayAmount < m_peakLevel)
m_decayedPeakLevel = m_peakLevel - decayAmount;
else
m_decayedPeakLevel = 0.0;
// Check whether to clear the peak hold level
if (m_peakHoldLevelChanged.elapsed() > PeakHoldLevelDuration)
m_peakHoldLevel = 0.0;
update();
}
void LevelMeter::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event)
QPainter painter(this);
render(&painter);
}
void LevelMeter::resizeEvent(QResizeEvent * event)
{
Q_UNUSED(event)
resized();
}
void LevelMeter::setAverageSmoothing(uint32_t smoothingFactor)
{
m_avgSmoothing = smoothingFactor < 1 ? 1 : smoothingFactor > 256 ? 256 : smoothingFactor;
}
// ====================================================================
LevelMeterVU::LevelMeterVU(QWidget *parent) :
LevelMeter(parent)
{
m_scaleEngine.setFont(font());
m_scaleEngine.setOrientation(Qt::Horizontal);
m_scaleEngine.setRange(Unit::Percent, 0, 100);
resized();
}
LevelMeterVU::~LevelMeterVU()
{
}
void LevelMeterVU::resized()
{
if (m_backgroundPixmap)
{
delete m_backgroundPixmap;
}
m_backgroundPixmap = new QPixmap(rect().width(), rect().height());
m_backgroundPixmap->fill(QColor(42, 42, 42, 255));
QPainter painter(m_backgroundPixmap);
QRect barTop = m_backgroundPixmap->rect();
barTop.setBottom(0.5 * rect().height() - 2);
barTop.setTop(2);
barTop.setLeft(0.75* rect().width());
painter.fillRect(barTop, Qt::red);
QRect bar = m_backgroundPixmap->rect();
// 100% full height white line
painter.setPen(Qt::white);
painter.setFont(font());
// painter.drawLine(0.75*bar.width(), 0, 0.75*bar.width(), bar.height());
m_scaleEngine.setSize(0.75*bar.width());
const ScaleEngine::TickList& scaleTickList = m_scaleEngine.getTickList();
for (int i = 0; i < scaleTickList.count(); i++)
{
// qDebug() << "LevelMeterVU::resized: tick #" << i
// << " major: " << scaleTickList[i].major
// << " pos: " << scaleTickList[i].pos
// << " text: " << scaleTickList[i].text
// << " textPos: " << scaleTickList[i].textPos
// << " textSize: " << scaleTickList[i].textSize;
const ScaleEngine::Tick tick = scaleTickList[i];
if(tick.major)
{
if ((tick.textSize > 0) && (tick.textPos > 0))
{
painter.drawText(QPointF(tick.textPos - (tick.textSize/2) - 4, bar.height()/2 - 3), tick.text);
}
painter.drawLine(shiftx(tick.pos, bar.width()), 0, shiftx(scaleTickList[i].pos, bar.width()), bar.height());
}
else
{
painter.drawLine(tick.pos, bar.height()/2 - 2, scaleTickList[i].pos, bar.height()/2);
}
}
}
void LevelMeterVU::render(QPainter *painter)
{
painter->drawPixmap(rect(), *m_backgroundPixmap);
QRect bar = rect();
// Bottom moving gauge
bar.setTop(0.5 * rect().height() + 2);
bar.setBottom(rect().height() - 1);
bar.setRight(rect().right() - (1.0 - 0.75*m_peakHoldLevel) * rect().width());
bar.setLeft(bar.right() - 2);
painter->fillRect(bar, m_peakColor);
bar.setBottom(0.75*rect().height());
bar.setRight(rect().right() - (1.0 - 0.75*m_avgLevel) * rect().width());
bar.setLeft(1);
painter->fillRect(bar, m_avgColor);
bar.setTop(0.75 * rect().height() + 1);
bar.setBottom(rect().height() - 1);
bar.setRight(rect().right() - (1.0 - 0.75*m_decayedPeakLevel) * rect().width());
painter->fillRect(bar, m_decayedPeakColor);
// borders
painter->setPen(QColor(0,0,0));
painter->drawLine(0, 0, rect().width() - 2, 0);
painter->drawLine(0, rect().height() - 1, 0, 0);
painter->setPen(QColor(80,80,80));
painter->drawLine(1, rect().height() - 1, rect().width() - 1, rect().height() - 1);
painter->drawLine(rect().width() - 1, rect().height() - 1, rect().width() - 1, 0);
}
// ====================================================================
const QColor LevelMeterSignalDB::m_avgColor[4] = {
QColor(0xff, 0x8b, 0x00, 128),
QColor(0x8c, 0xff, 0x00, 128),
QColor(0x8c, 0xff, 0x00, 128),
QColor(0x8c, 0xbf, 0xff, 128),
};
const QColor LevelMeterSignalDB::m_decayedPeakColor[4] = {
QColor(0x97, 0x54, 0x00, 128),
QColor(0x53, 0x96, 0x00, 128),
QColor(0x00, 0x96, 0x53, 128),
QColor(0x00, 0x94, 0x94, 128),
};
const QColor LevelMeterSignalDB::m_peakColor[4] = {
Qt::red,
Qt::green,
Qt::green,
Qt::cyan
};
LevelMeterSignalDB::LevelMeterSignalDB(QWidget *parent) :
LevelMeter(parent),
m_colorTheme(ColorGold)
{
m_scaleEngine.setFont(font());
m_scaleEngine.setOrientation(Qt::Horizontal);
m_scaleEngine.setRange(Unit::Decibel, -100, 0);
resized();
}
LevelMeterSignalDB::~LevelMeterSignalDB()
{
}
void LevelMeterSignalDB::setRange(int min, int max)
{
m_scaleEngine.setRange(Unit::Decibel, min, max);
}
void LevelMeterSignalDB::resized()
{
if (m_backgroundPixmap)
{
delete m_backgroundPixmap;
}
m_backgroundPixmap = new QPixmap(rect().width(), rect().height());
m_backgroundPixmap->fill(QColor(42, 42, 42, 255));
QPainter painter(m_backgroundPixmap);
QRect bar = m_backgroundPixmap->rect();
// 100% full height white line
painter.setPen(Qt::white);
painter.setFont(font());
m_scaleEngine.setSize(bar.width());
const ScaleEngine::TickList& scaleTickList = m_scaleEngine.getTickList();
for (int i = 0; i < scaleTickList.count(); i++)
{
// qDebug() << "LevelMeterVU::resized: tick #" << i
// << " major: " << scaleTickList[i].major
// << " pos: " << scaleTickList[i].pos
// << " text: " << scaleTickList[i].text
// << " textPos: " << scaleTickList[i].textPos
// << " textSize: " << scaleTickList[i].textSize;
const ScaleEngine::Tick tick = scaleTickList[i];
if(tick.major)
{
if ((tick.textSize > 0) && (tick.textPos > 0))
{
painter.drawText(QPointF(tick.textPos - (tick.textSize/2) - 4, bar.height()/2 - 3), tick.text);
}
painter.drawLine(shiftx(tick.pos, bar.width()), 0, shiftx(scaleTickList[i].pos,bar.width()), bar.height());
}
else
{
painter.drawLine(tick.pos, bar.height()/2 - 2, scaleTickList[i].pos, bar.height()/2);
}
}
}
void LevelMeterSignalDB::render(QPainter *painter)
{
painter->drawPixmap(rect(), *m_backgroundPixmap);
QRect bar = rect();
// Bottom moving gauge
bar.setTop(0.5 * rect().height() + 2);
bar.setBottom(0.75*rect().height());
bar.setRight(rect().right() - (1.0 - m_avgLevel) * rect().width());
bar.setLeft(1);
painter->fillRect(bar, m_avgColor[m_colorTheme]);
bar.setTop(0.75 * rect().height() + 1);
bar.setBottom(rect().height() - 1);
bar.setRight(rect().right() - (1.0 - m_decayedPeakLevel) * rect().width());
painter->fillRect(bar, m_decayedPeakColor[m_colorTheme]);
bar.setTop(0.5 * rect().height() + 2);
bar.setBottom(rect().height() - 1);
bar.setRight(rect().right() - (1.0 - m_peakHoldLevel) * rect().width());
bar.setLeft(bar.right() - 2);
painter->fillRect(bar, m_peakColor[m_colorTheme]);
// borders
painter->setPen(QColor(0,0,0));
painter->drawLine(0, 0, rect().width() - 2, 0);
painter->drawLine(0, rect().height() - 1, 0, 0);
painter->setPen(QColor(80,80,80));
painter->drawLine(1, rect().height() - 1, rect().width() - 1, rect().height() - 1);
painter->drawLine(rect().width() - 1, rect().height() - 1, rect().width() - 1, 0);
}
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