chart.cpp Example File

dynamicspline/chart.cpp
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 #include "chart.h"
 #include <QtCharts/QAbstractAxis>
 #include <QtCharts/QSplineSeries>
 #include <QtCharts/QValueAxis>
 #include <QtCore/QRandomGenerator>
 #include <QtCore/QDebug>

 Chart::Chart(QGraphicsItem *parent, Qt::WindowFlags wFlags):
     QChart(QChart::ChartTypeCartesian, parent, wFlags),
     m_series(0),
     m_axisX(new QValueAxis()),
     m_axisY(new QValueAxis()),
     m_step(0),
     m_x(5),
     m_y(1)
 {
     QObject::connect(&m_timer, &QTimer::timeout, this, &Chart::handleTimeout);
     m_timer.setInterval(1000);

     m_series = new QSplineSeries(this);
     QPen green(Qt::red);
     green.setWidth(3);
     m_series->setPen(green);
     m_series->append(m_x, m_y);

     addSeries(m_series);

     addAxis(m_axisX,Qt::AlignBottom);
     addAxis(m_axisY,Qt::AlignLeft);
     m_series->attachAxis(m_axisX);
     m_series->attachAxis(m_axisY);
     m_axisX->setTickCount(5);
     m_axisX->setRange(0, 10);
     m_axisY->setRange(-5, 10);

     m_timer.start();
 }

 Chart::~Chart()
 {

 }

 void Chart::handleTimeout()
 {
     qreal x = plotArea().width() / m_axisX->tickCount();
     qreal y = (m_axisX->max() - m_axisX->min()) / m_axisX->tickCount();
     m_x += y;
     m_y = QRandomGenerator::global()->bounded(5) - 2.5;
     m_series->append(m_x, m_y);
     scroll(x, 0);
     if (m_x == 100)
         m_timer.stop();
 }