Qt官方示例-條形圖

該示例顯示如何建立條形圖。

0x01 建立圖表容器

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 配置座標軸

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 加載條形圖數據項

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 配置圖例註解位置

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

關於更多

• 在QtCreator軟件能夠找到：

• 或在如下Qt安裝目錄找到：

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

• 相關連接

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

• Qt君公衆號回覆『Qt示例』獲取更多內容。