用QT的 QChar 展示 "COVID-19" 新增和死亡数量变化曲线

1.关键代码：

QChart *QcharWidget::createLineChart() const
{
    QChart *chart = new QChart();
    chart->setTitle("Line chart");

    DataTable::const_iterator it = m_dataTable.constBegin();
    while (it != m_dataTable.constEnd()) {
        QLineSeries *series = new QLineSeries();
        series->setName(it.key());
        foreach(auto it_data,it.value()){
           series->append(it_data.first, it_data.second);
        }
        chart->addSeries(series);
        ++it;
    }
    createCommonAxis(chart);
    return chart;
}

void QcharWidget::createCommonAxis(QChart *chart, QStringList *categories) const
{
    //X
    QAbstractAxis* axisX = nullptr;
    if(categories!=nullptr)
    {
        axisX = new QBarCategoryAxis();
        qobject_cast<QBarCategoryAxis*>(axisX)->append(*categories);
    }else{
        axisX = new QDateTimeAxis();
        qobject_cast<QDateTimeAxis*>(axisX)->setFormat("MM-dd");
    }
    chart->addAxis(axisX, Qt::AlignBottom);

    //Y
    QValueAxis *axisY = new QValueAxis;
    axisY->setRange(0,100000);
    axisY->setLabelFormat("%d");
    chart->addAxis(axisY,Qt::AlignLeft);

    //
    foreach(auto serier,chart->series()){
        serier->attachAxis(axisX);
        serier->attachAxis(axisY);
    }
}

2.效果

 GIF：

 3.数据来源

 

 

 4.完整源代码：

https://github.com/SanSuiWanTong/QT_ToolBox