Qt官方示例-条形图

该示例显示如何创建条形图。

main_page.png

0x01 创建图表容器

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

QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);

0x02 配置坐标轴

QStringList categories;
categories << "Jan" << "Feb" << "Mar" << "Apr" << "May" << "Jun";
QBarCategoryAxis *axisX = new QBarCategoryAxis();
axisX->append(categories);
chart->addAxis(axisX, Qt::AlignBottom);
series->attachAxis(axisX);

QValueAxis *axisY = new QValueAxis();
axisY->setRange(0,15);
chart->addAxis(axisY, Qt::AlignLeft);
series->attachAxis(axisY);

0x03 加载条形图数据项

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 << 5 << 6;
*set1 << 5 << 0 << 0 << 4 << 0 << 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);

0x04 配置图例注解位置

chart->legend()->setVisible(true);
chart->legend()->setAlignment(Qt::AlignBottom); /* 显示在底部 */

关于更多

• 在QtCreator软件可以找到：

what_find.png

• 或在以下Qt安装目录找到：

C:\Qt\{你的Qt版本}\Examples\{你的Qt版本}\charts\barchart

• 相关链接

https://doc.qt.io/qt-5/qtcharts-barchart-example.html

• Qt君公众号回复『Qt示例』获取更多内容。