datetimeaxiswidget.cpp

Enable keyboard shortcuts

// Copyright (C) 2023 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include "datetimeaxiswidget.h"

#include <QChart>

#include <QDateTime>

#include <QDateTimeAxis>

#include <QFile>

#include <QLineSeries>

#include <QTextStream>

#include <QValueAxis>

DateTimeAxisWidget::DateTimeAxisWidget(QWidget *parent)

    : ContentWidget(parent)

bool DateTimeAxisWidget::doLoad()

    //![1]

    auto series = new QLineSeries;

    //![1]

    //![2]

    // data from http://www.swpc.noaa.gov/ftpdir/weekly/RecentIndices.txt

    // http://www.swpc.noaa.gov/ftpdir/weekly/README

    // http://www.weather.gov/disclaimer

    QFile sunSpots(":sun_spots");

    if (!sunSpots.open(QIODevice::ReadOnly | QIODevice::Text)) {

        m_loadError = QStringLiteral("Failed to load '%1' file.").arg(sunSpots.fileName());

        return false;

    QTextStream stream(&sunSpots);

    while (!stream.atEnd()) {

        QString line = stream.readLine();

        if (line.startsWith("#") || line.startsWith(":"))

            continue;

        QStringList values = line.split(QLatin1Char(' '), Qt::SkipEmptyParts);

        QDateTime momentInTime;

        momentInTime.setDate(QDate(values[0].toInt(), values[1].toInt() , 15));

        series->append(momentInTime.toMSecsSinceEpoch(), values[2].toDouble());

    sunSpots.close();

    //![2]

    //![3]

    auto chart = new QChart;

    chart->addSeries(series);

    chart->legend()->hide();

    chart->setTitle("Sunspots count (by Space Weather Prediction Center)");

    //![3]

    //![4]

    auto axisX = new QDateTimeAxis;

    axisX->setTickCount(10);

    axisX->setFormat("MMM yyyy");

    axisX->setTitleText("Date");

    chart->addAxis(axisX, Qt::AlignBottom);

    series->attachAxis(axisX);

    auto axisY = new QValueAxis;

    axisY->setLabelFormat("%i");

    axisY->setTitleText("Sunspots count");

    chart->addAxis(axisY, Qt::AlignLeft);

    series->attachAxis(axisY);

    //![4]

    //![5]

    createDefaultChartView(chart);

    //![5]

    return true;