qt-everywhere-src-5.15.1/qtcharts/examples/charts/zoomlinechart/main.cpp

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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 "chartview.h"
#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtCore/QtMath>
#include <QtCore/QRandomGenerator>
#include <QtCharts/QLineSeries>
#include <QtCharts/QValueAxis>

QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

//![1]
    QLineSeries *series = new QLineSeries();
    for (int i = 0; i < 500; i++) {
        QPointF p((qreal) i, qSin(M_PI / 50 * i) * 100);
        p.ry() += QRandomGenerator::global()->bounded(20);
        *series << p;
    }
//![1]

    Chart *chart = new Chart();
    chart->addSeries(series);
    chart->setTitle("Zoom in/out example");
    chart->setAnimationOptions(QChart::SeriesAnimations);
    chart->legend()->hide();
    chart->createDefaultAxes();

    ChartView *chartView = new ChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    QMainWindow window;
    window.setCentralWidget(chartView);
    window.resize(400, 300);
    window.grabGesture(Qt::PanGesture);
    window.grabGesture(Qt::PinchGesture);
    window.show();

    return a.exec();
}