Qt创建并显示柱状图的方法

QBarSet *set0 = new QBarSet("Jane");
QBarSet *set1 = new QBarSet("John");
QBarSet *set2 = new QBarSet("Axel");
QBarSet *set3 = new QBarSet("Mary");
QBarSet *set4 = new QBarSet("Samantha");

*set0 << 1 << 2 << 3 << 4 << 13 << 6;
*set1 << 5 << 0 << 0 << 4 << 15 << 7;
*set2 << 3 << 5 << 8 << 13 << 8 << 5;
*set3 << 5 << 6 << 7 << 3 << 4 << 5;
*set4 << 9 << 7 << 5 << 3 << 1 << 2;

QBarSeries *series = new QBarSeries();
series->append(set0);
series->append(set1);
series->append(set2);
series->append(set3);
series->append(set4);

QChart *chart = new QChart();
chart->addSeries(series);
chart->setTitle("Simple barchart example");
chart->setAnimationOptions(QChart::SeriesAnimations);

QChartView *chartView = new QChartView(chart);

QMainWindow window;
window.setCentralWidget(chartView);
window.resize(420, 300);
window.show();

QStringList cateGories;
categories << "Jan" << "Feb" << "Mar" << "Apr" << "May" << "Jun";  //保存横坐标字符串的列表
QBarCategoryAxis *axis = new QBarCategoryAxis();
axis->append(categories);
chart->createDefaultAxes();  //创建一个默认的坐标轴
chart->setAxisX(axis, series);　　//设置X坐标轴

series->setLabelsPosition(QAbstractBarSeries::LabelsInsideEnd);  //设置标签显示的位置
series->setLabelsVisible(true);  //设置数据标签可见

chart->setTheme(QChart::ChartThemeBlueCerulean);

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

//...
QWidget *widget = new QWidget();
QHBoxLayout m_pHLayout = new QHBoxLayout();
m_pHLayout->addWidget(chartView);
widget->setLayout(m_pHLayout);
//...