chart.cpp Example File

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  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
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  ** This file is part of the Qt Charts module of the Qt Toolkit.
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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();
  }