chart.cpp Example File | Qt Charts 5.12.8

- Qt 5.12
- Qt Charts
- Dynamic Spline Example
- chart.cpp Example File
- Qt Charts | Commercial or GPLv3

# chart.cpp Example File

dynamicspline/chart.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2016 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the Qt Charts module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:GPL$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
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     ** information use the contact form at https://www.qt.io/contact-us.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3 or (at your option) any later version
     ** approved by the KDE Free Qt Foundation. The licenses are as published by
     ** the Free Software Foundation and appearing in the file LICENSE.GPL3
     ** included in the packaging of this file. Please review the following
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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();
     }