Qt Charts 在Qt4时代就有了,不过一直以来是商业许可的。QCharts可以在社区版使用后,Qt画图再也不用需要配置第三方的qcustomplot和qwt插件了,QCharts功能比两者都好,且易用安装和使用。从5.7.0开始,Qt Charts 也纳入了开放许可证。
安装时记得勾选QCharts模块。下方是3D可视化模块,下次有机会再分享。
Demo平台:Win10、 Qt 5.12.1、 MinGW 7.3.0 64-bit
1 pro中添加charts模块
QT += charts
2. 头文件与命名空间设置
#include <QtCharts>
using namespace QtCharts;
//QT_CHARTS_USE_NAMESPACE
也可以通过宏定义进行设置
3. 程序源码
程序就是Qt文档的源码,文档中是在MainWindow中显示的,我是在Widget中加了一个布局显示的。
girdLayoutChart = new QGridLayout(this);
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);
QChart *chart = new QChart();
chart->addSeries(series); //加入柱状图
chart->setTitle("Simple barchart example");
chart->setAnimationOptions(QChart::SeriesAnimations);
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);
chart->legend()->setVisible(true);
chart->legend()->setAlignment(Qt::AlignBottom);
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
//布局中加入窗体
girdLayoutChart->addWidget(chartView);
运行效果:
4. 更多示例
https://doc.qt.io/qt-5/qtcharts-examples.html
5. 小结
Qt 2D数据可视化方面多提供一种思路。