main.cpp 范例文件

datetimeaxis/main.cpp
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#include <QtWidgets/QApplication> #include <QtWidgets/QMainWindow> #include <QtCharts/QChartView> #include <QtCharts/QLineSeries> #include <QtCore/QDateTime> #include <QtCharts/QDateTimeAxis> #include <QtCore/QFile> #include <QtCore/QTextStream> #include <QtCore/QDebug> #include <QtCharts/QValueAxis> QT_CHARTS_USE_NAMESPACE int main(int argc, char *argv[]) { QApplication a(argc, argv); qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime())); QLineSeries *series = new QLineSeries(); // 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"); if (!sunSpots.open(QIODevice::ReadOnly | QIODevice::Text)) { return 1; } QTextStream stream(&sunSpots); while (!stream.atEnd()) { QString line = stream.readLine(); if (line.startsWith("#") || line.startsWith(":")) continue; QStringList values = line.split(" ", QString::SkipEmptyParts); QDateTime momentInTime; momentInTime.setDate(QDate(values[0].toInt(), values[1].toInt() , 15)); series->append(momentInTime.toMSecsSinceEpoch(), values[2].toDouble()); } sunSpots.close(); QChart *chart = new QChart(); chart->addSeries(series); chart->legend()->hide(); chart->setTitle("Sunspots count (by Space Weather Prediction Center)"); QDateTimeAxis *axisX = new QDateTimeAxis; axisX->setTickCount(10); axisX->setFormat("MMM yyyy"); axisX->setTitleText("Date"); chart->addAxis(axisX, Qt::AlignBottom); series->attachAxis(axisX); QValueAxis *axisY = new QValueAxis; axisY->setLabelFormat("%i"); axisY->setTitleText("Sunspots count"); chart->addAxis(axisY, Qt::AlignLeft); series->attachAxis(axisY); QChartView *chartView = new QChartView(chart); chartView->setRenderHint(QPainter::Antialiasing); QMainWindow window; window.setCentralWidget(chartView); window.resize(820, 600); window.show(); return a.exec(); }