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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtDataVisualization module.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
**
****************************************************************************/
#include "engine.h"
#include "utils.h"
#include <QtDataVisualization/q3dbars.h>
#include <QtDataVisualization/qbardataproxy.h>
#include <QtDataVisualization/qvalue3daxis.h>
#include <QtDataVisualization/qcategory3daxis.h>
#include <QtDataVisualization/q3dscene.h>
#include <QtDataVisualization/q3dcamera.h>
#include <QtDataVisualization/qbar3dseries.h>
#include <QtDataVisualization/q3dtheme.h>
#include <QGuiApplication>
#include <QAudio>
#include <QTimer>
//#define USE_CONES
using namespace QtDataVisualization;
class MainApp : public QObject
{
public:
MainApp(Q3DBars *window);
~MainApp();
void start(QString fileName);
public slots:
void spectrumChanged(qint64 position, qint64 length, const FrequencySpectrum &spectrum);
void stateChanged(QAudio::Mode mode, QAudio::State state);
private slots:
void restart();
private:
int barIndex(qreal frequency) const;
private:
Q3DBars *m_chart;
Engine *m_engine;
QTimer *m_restartTimer;
// Lower bound of first band in the spectrum in Hz
qreal m_lowFreq;
// Upper band of last band in the spectrum in Hz
qreal m_highFreq;
};
MainApp::MainApp(Q3DBars *window)
: m_chart(window),
m_engine(new Engine(this)),
m_restartTimer(new QTimer(this)),
m_lowFreq(SpectrumLowFreq),
m_highFreq(SpectrumHighFreq)
{
m_chart->rowAxis()->setMax(SpectrumNumBands * 2);
m_chart->columnAxis()->setMax(SpectrumNumBands - 1);
// Disable grid
m_chart->activeTheme()->setGridEnabled(false);
// Disable auto-scaling of height by defining explicit range
m_chart->valueAxis()->setRange(0.0f, 1.0f);
// Disable shadows
m_chart->setShadowQuality(QAbstract3DGraph::ShadowQualityNone);
#if USE_CONES
// Set bar specifications; make them a bit wider than deep and make them be drawn 75%
// inside each other
m_chart->setBarThickness(1.25);
m_chart->setBarSpacing(QSizeF(0.2, -0.75));
// Set bar type, smooth cones
m_chart->setBarType(QAbstract3DGraph::MeshCones, true);
// Adjust zoom manually; automatic zoom level calculation does not work well with negative
// spacings (in setBarSpacing)
m_chart->setCameraPosition(10.0f, 5.0f, 70.0f);
#else
// Set bar specifications; make them twice as wide as they're deep
m_chart->setBarThickness(2.0f);
m_chart->setBarSpacing(QSizeF(0.0, 0.0));
// Set bar type, flat bars
// Adjust camera position
m_chart->scene()->activeCamera()->setCameraPosition(10.0f, 7.5f, 75.0f);
#endif
// Disable selection
m_chart->setSelectionMode(QAbstract3DGraph::SelectionNone);
QObject::connect(m_engine, &Engine::changedSpectrum, this, &MainApp::spectrumChanged);
QObject::connect(m_engine, &Engine::stateChanged, this, &MainApp::stateChanged);
m_restartTimer->setSingleShot(true);
QObject::connect(m_restartTimer, &QTimer::timeout, this, &MainApp::restart);
QBar3DSeries *series = new QBar3DSeries();
series->setBaseColor(QColor(Qt::red));
series->setMesh(QAbstract3DSeries::MeshBar);
m_chart->addSeries(series);
}
MainApp::~MainApp()
{
delete m_engine;
delete m_restartTimer;
}
void MainApp::start(QString fileName)
{
m_engine->loadFile(fileName);
m_engine->startPlayback();
}
//-----------------------------------------------------------------------------
// Public slots
//-----------------------------------------------------------------------------
void MainApp::spectrumChanged(qint64 position, qint64 length, const FrequencySpectrum &spectrum)
{
Q_UNUSED(position);
Q_UNUSED(length);
//qDebug() << "updating bar values" << position << length;
QBarDataRow *data = new QBarDataRow(SpectrumNumBands);
for (int bar = 0; bar < SpectrumNumBands; bar++) {
// init data set
(*data)[bar].setValue(qreal(0.0));
}
FrequencySpectrum::const_iterator i = spectrum.begin();
const FrequencySpectrum::const_iterator end = spectrum.end();
for ( ; i != end; ++i) {
const FrequencySpectrum::Element e = *i;
if (e.frequency >= m_lowFreq && e.frequency < m_highFreq) {
(*data)[barIndex(e.frequency)].setValue(qMax(data->at(barIndex(e.frequency)).value(), float(e.amplitude)));
}
}
m_chart->seriesList().at(0)->dataProxy()->insertRow(0, data);
}
void MainApp::stateChanged(QAudio::Mode mode, QAudio::State state)
{
//qDebug() << "mode:" << mode << " state: " << state;
// Restart once playback is finished
if (QAudio::AudioOutput == mode && QAudio::StoppedState == state)
m_restartTimer->start(500);
}
//-----------------------------------------------------------------------------
// Private slots
//-----------------------------------------------------------------------------
void MainApp::restart()
{
// Change file each time
QString fileToLoad = QStringLiteral(":/file");
static int fileNo = 3;
QString nrStr;
nrStr.setNum(fileNo);
fileToLoad.append(nrStr);
//qDebug() << fileToLoad;
start(fileToLoad);
fileNo++;
if (fileNo > 3)
fileNo = 1;
}
//-----------------------------------------------------------------------------
// Private functions
//-----------------------------------------------------------------------------
int MainApp::barIndex(qreal frequency) const
{
Q_ASSERT(frequency >= m_lowFreq && frequency < m_highFreq);
const qreal bandWidth = (m_highFreq - m_lowFreq) / SpectrumNumBands;
const int index = (frequency - m_lowFreq) / bandWidth;
if (index < 0 || index >= SpectrumNumBands)
Q_ASSERT(false);
//qDebug() << "insert to" << index;
return index;
}
//-----------------------------------------------------------------------------
// main
//-----------------------------------------------------------------------------
int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);
app.setApplicationName("QtDataVisualization spectrum analyzer");
Q3DBars window;
window.setFlags(window.flags() ^ Qt::FramelessWindowHint);
window.resize(1024, 768);
window.show();
MainApp *mainApp = new MainApp(&window);
mainApp->start(QStringLiteral(":/file2"));
return app.exec();
}
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