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++ // Copyright (C) 2016 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #include "chartview.h"
++ #include <QtCharts/QLineSeries>
++ #include <QtCharts/QScatterSeries>
++ #include <QtCharts/QSplineSeries>
++ #include <QtCharts/QAreaSeries>
++ #include <QtCore/QRandomGenerator>
++
++ ChartView::ChartView(QChart *chart, QWidget *parent)
++ : QChartView(chart, parent),
++ m_index(-1),
++ m_chart(chart)
++ {
++ m_chart->setTitle("Charts presenter");
++ m_chart->setDropShadowEnabled(false);
++ QObject::connect(&m_timer, SIGNAL(timeout()), this, SLOT(handleTimeout()));
++ m_timer.setInterval(3000);
++
++ //![1]
++ QLineSeries *series0 = new QLineSeries();
++ series0->setName("line");
++
++ QScatterSeries *series1 = new QScatterSeries();
++ series1->setName("scatter");
++
++ QSplineSeries *series2 = new QSplineSeries();
++ series2->setName("spline");
++
++ QAreaSeries *series3 = new QAreaSeries(series0);
++ series3->setName("area");
++ //![1]
++
++ //![2]
++ int numPoints = 10;
++
++ for (int x = 0; x <= numPoints; ++x) {
++ qreal y = QRandomGenerator::global()->bounded(100);
++ series0->append(x, y);
++ series1->append(x, y);
++ series2->append(x, y);
++ }
++ //![2]
++
++ //![3]
++ m_series << series0;
++ m_titles << m_chart->title() + ": LineChart";
++ m_series << series1;
++ m_titles << m_chart->title() + ": ScatterChart";
++ m_series << series2;
++ m_titles << m_chart->title() + ": SplineChart";
++ m_series << series3;
++ m_titles << m_chart->title() + ": AreaChart";
++ //![3]
++
++ m_timer.start();
++ handleTimeout();
++ }
++
++ ChartView::~ChartView()
++ {
++ if (m_series.size() == 0)
++ return;
++ m_chart->removeSeries(m_series.at(m_index));
++ m_series.removeLast(); //remove QAreaSeries instance since they will be deleted when QLineSeries instance is gone
++ qDeleteAll(m_series);
++ }
++
++ //![4]
++ void ChartView::handleTimeout()
++ {
++ if (m_series.size() == 0)
++ return;
++ if (m_index >= 0)
++ m_chart->removeSeries(m_series.at(m_index));
++ m_index++;
++ m_index = m_index % m_series.size();
++ m_chart->addSeries(m_series.at(m_index));
++ m_chart->setTitle(m_titles.at(m_index));
++ m_chart->createDefaultAxes();
++ }
++ //![4]