在一张图中包含多个系列的Qt条形图

#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtCharts/QChartView>
#include <QtCharts/QBarSeries>
#include <QtCharts/QBarSet>
#include <QtCharts/QBarCategoryAxis>
#include <QtCharts/QValueAxis>

QT_CHARTS_USE_NAMESPACE

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

    QMainWindow window;
    QChartView *chartView = new QChartView(&window);
    window.setCentralWidget(chartView);

    QChart *chart = new QChart();
    chart->setTitle("Multiple Series Bar Chart");

    QBarSeries *series1 = new QBarSeries();
    QBarSet *set1 = new QBarSet("Series 1");
    *set1 << 1 << 2 << 3 << 4 << 5;
    series1->append(set1);

    QBarSeries *series2 = new QBarSeries();
    QBarSet *set2 = new QBarSet("Series 2");
    *set2 << 6 << 7 << 8 << 9 << 10;
    series2->append(set2);

    chart->addSeries(series1);
    chart->addSeries(series2);

    QBarCategoryAxis *axisX = new QBarCategoryAxis();
    axisX->append("Category 1");
    axisX->append("Category 2");
    axisX->append("Category 3");
    axisX->append("Category 4");
    axisX->append("Category 5");
    chart->addAxis(axisX, Qt::AlignBottom);
    series1->attachAxis(axisX);
    series2->attachAxis(axisX);

    QValueAxis *axisY = new QValueAxis();
    axisY->setTitleText("Value");
    chart->addAxis(axisY, Qt::AlignLeft);
    series1->attachAxis(axisY);
    series2->attachAxis(axisY);

    chart->legend()->setVisible(true);
    chart->legend()->setAlignment(Qt::AlignBottom);

    chartView->setChart(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

    window.resize(800, 600);
    window.show();

    return a.exec();
}