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29
30#include "wavechart.h"
31#include <qmath.h>
32#include <qrandom.h>
33
34QT_CHARTS_USE_NAMESPACE
35
36static const int numPoints =100;
37
38WaveChart::WaveChart(QChart* chart, QWidget* parent) :
39 QChartView(chart, parent),
40 m_series(new QLineSeries()),
41 m_wave(0),
42 m_step(2 * M_PI / numPoints)
43{
44 QPen blue(Qt::blue);
45 blue.setWidth(3);
46 m_series->setPen(blue);
47
48 chart->legend()->setVisible(false);
49
50 int fluctuate = 100;
51
52 for (qreal x = 0; x <= 2 * M_PI; x += m_step) {
53 m_series->append(x, y: fabs(x: sin(x: x) * fluctuate));
54 }
55
56 chart->addSeries(series: m_series);
57 chart->createDefaultAxes();
58
59 QObject::connect(sender: &m_timer, SIGNAL(timeout()), receiver: this, SLOT(update()));
60 m_timer.setInterval(5000);
61 m_timer.start();
62}
63
64void WaveChart::update()
65{
66
67 int fluctuate;
68 const QList<QPointF>& points = m_series->points();
69 for (qreal i = 0, x = 0; x <= 2 * M_PI; x += m_step, i++) {
70 fluctuate = QRandomGenerator::global()->bounded(highest: 100);
71 m_series->replace(oldX: x,oldY: points[i].y(),newX: x,newY: fabs(x: sin(x: x) * fluctuate));
72
73 }
74
75}
76

source code of qtcharts/tests/manual/wavechart/wavechart.cpp