##// END OF EJS Templates
HG_REPOSITORIES » LPP » INSTRUMENTATION » USERS » JEANDET » qtcharts
RSS

Clone from http://code.qt.io/qt/qtcharts.git

Added axes titles to audio example and decreased the number of samples on chart to 2000
Marek Rosa -
r2214:0a3cbf6ad29b
parent child
Show More
Side by Side Unified
Context file:
r2214:0a3cbf6ad29b Loading diff...:
Show file before | Show file after | Hide comments
@@ -1,59 +1,62
1 1 #include "widget.h"
2 2 #include <QAudioDeviceInfo>
3 3 #include <QAudioInput>
4 4 #include <QChartView>
5 5 #include <QLineSeries>
6 6 #include <QChart>
7 7 #include <QVBoxLayout>
8 8 #include <QValueAxis>
9 9 #include "xyseriesiodevice.h"
10 10
11 11 QTCOMMERCIALCHART_USE_NAMESPACE
12 12
13 13 Widget::Widget(QWidget *parent)
14 14 : QWidget(parent),
15 15 m_device(0),
16 16 m_chart(0),
17 17 m_series(0),
18 18 m_audioInput(0)
19 19 {
20 20 m_chart = new QChart;
21 21 QChartView *chartView = new QChartView(m_chart);
22 22 chartView->setMinimumSize(800, 600);
23 23 m_series = new QLineSeries;
24 24 m_chart->addSeries(m_series);
25 25 QValueAxis *axisX = new QValueAxis;
26 axisX->setRange(0, 4000);
26 axisX->setRange(0, 2000);
27 axisX->setLabelFormat("%g");
28 axisX->setTitle("Samples");
27 29 QValueAxis *axisY = new QValueAxis;
28 axisY->setRange(0, 256);
29 m_chart->setAxisX(axisX, m_series);
30 axisY->setRange(-1, 1);
31 axisY->setTitle("Audio level");
32 m_chart->setAxisX(axisX, m_series);
30 33 m_chart->setAxisY(axisY, m_series);
31 34 m_chart->legend()->hide();
32 m_chart->setTitle("Data from microphone");
35 m_chart->setTitle("Data from the microphone");
33 36
34 37 QVBoxLayout *mainLayout = new QVBoxLayout;
35 38 mainLayout->addWidget(chartView);
36 39 setLayout(mainLayout);
37 40
38 41 QAudioFormat formatAudio;
39 42 formatAudio.setFrequency(8000);
40 43 formatAudio.setChannels(1);
41 44 formatAudio.setSampleSize(8);
42 45 formatAudio.setCodec("audio/pcm");
43 46 formatAudio.setByteOrder(QAudioFormat::LittleEndian);
44 47 formatAudio.setSampleType(QAudioFormat::UnSignedInt);
45 48
46 49 QAudioDeviceInfo inputDevices = QAudioDeviceInfo::defaultInputDevice();
47 50 m_audioInput = new QAudioInput(inputDevices,formatAudio, this);
48 51
49 52 m_device = new XYSeriesIODevice(m_series, this);
50 53 m_device->open(QIODevice::WriteOnly);
51 54
52 55 m_audioInput->start(m_device);
53 56 }
54 57
55 58 Widget::~Widget()
56 59 {
57 60 m_audioInput->stop();
58 61 m_device->close();
59 62 }
Show file before | Show file after | Hide comments
@@ -1,36 +1,37
1 1 #include "xyseriesiodevice.h"
2 2 #include <QXYSeries>
3 3
4 4 XYSeriesIODevice::XYSeriesIODevice(QXYSeries * series, QObject *parent) :
5 5 QIODevice(parent),
6 6 m_series(series)
7 7 {
8 8 }
9 9
10 10 qint64 XYSeriesIODevice::readData(char * data, qint64 maxSize)
11 11 {
12 12 Q_UNUSED(data)
13 13 Q_UNUSED(maxSize)
14 14 return -1;
15 15 }
16 16
17 17 qint64 XYSeriesIODevice::writeData(const char * data, qint64 maxSize)
18 18 {
19 qint64 range = 4000;
19 qint64 range = 2000;
20 20 QList<QPointF> oldPoints = m_series->points();
21 21 QList<QPointF> points;
22 int resolution = 4;
22 23
23 24 if (oldPoints.count() < range) {
24 25 points = m_series->points();
25 26 } else {
26 for (int i = maxSize/2; i < oldPoints.count(); i++)
27 points.append(QPointF(i - maxSize/2, oldPoints.at(i).y()));
27 for (int i = maxSize/resolution; i < oldPoints.count(); i++)
28 points.append(QPointF(i - maxSize/resolution, oldPoints.at(i).y()));
28 29 }
29 30
30 31 qint64 size = points.count();
31 for (int k = 0; k < maxSize/2; k++)
32 points.append(QPointF(k + size, (quint8)data[2 * k]));
32 for (int k = 0; k < maxSize/resolution; k++)
33 points.append(QPointF(k + size, ((quint8)data[resolution * k] - 128)/128.0));
33 34
34 35 m_series->replace(points);
35 36 return maxSize;
36 37 }
General Comments 0
You need to be logged in to leave comments. Login now