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6** This file is part of the Qt Charts module of the Qt Toolkit.
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29
30#include "chart.h"
31#include <QtCharts/QAbstractAxis>
32#include <QtCharts/QSplineSeries>
33#include <QtCharts/QValueAxis>
34#include <QtCore/QRandomGenerator>
35#include <QtCore/QDebug>
36
37Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags):
38 QChart(QChart::ChartTypeCartesian, parent, wFlags),
39 m_series(0),
40 m_axisX(new QValueAxis()),
41 m_axisY(new QValueAxis()),
42 m_step(0),
43 m_x(5),
44 m_y(1)
45{
46 QObject::connect(sender: &m_timer, signal: &QTimer::timeout, receiver: this, slot: &Chart::handleTimeout);
47 m_timer.setInterval(1000);
48
49 m_series = new QSplineSeries(this);
50 QPen green(Qt::red);
51 green.setWidth(3);
52 m_series->setPen(green);
53 m_series->append(x: m_x, y: m_y);
54
55 addSeries(series: m_series);
56
57 addAxis(axis: m_axisX,alignment: Qt::AlignBottom);
58 addAxis(axis: m_axisY,alignment: Qt::AlignLeft);
59 m_series->attachAxis(axis: m_axisX);
60 m_series->attachAxis(axis: m_axisY);
61 m_axisX->setTickCount(5);
62 m_axisX->setRange(min: 0, max: 10);
63 m_axisY->setRange(min: -5, max: 10);
64
65 m_timer.start();
66}
67
68Chart::~Chart()
69{
70
71}
72
73void Chart::handleTimeout()
74{
75 qreal x = plotArea().width() / m_axisX->tickCount();
76 qreal y = (m_axisX->max() - m_axisX->min()) / m_axisX->tickCount();
77 m_x += y;
78 m_y = QRandomGenerator::global()->bounded(highest: 5) - 2.5;
79 m_series->append(x: m_x, y: m_y);
80 scroll(dx: x, dy: 0);
81 if (m_x == 100)
82 m_timer.stop();
83}
84

source code of qtcharts/examples/charts/dynamicspline/chart.cpp