超简单的piechart

#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtCharts/QChartView>
#include <QtCharts/QPieSeries>
#include <QtCharts/QPieSlice>

QT_CHARTS_USE_NAMESPACE

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

//![1]
QPieSeries *series = new QPieSeries();
series->append("Jane", 1);
series->append("Joe", 2);
series->append("Andy", 3);
series->append("Barbara", 4);
series->append("Axel", 5);
//![1]

//![2]
QPieSlice *slice = series->slices().at(1);
slice->setExploded();
slice->setLabelVisible();
slice->setPen(QPen(Qt::darkGreen, 2));
slice->setBrush(Qt::green);
//![2]

//![3]
QChart *chart = new QChart();
chart->addSeries(series);
chart->setTitle("Simple piechart example");
chart->legend()->hide();
//![3]

//![4]
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
//![4]

//![5]
QMainWindow window;
window.setCentralWidget(chartView);
window.resize(400, 300);
window.show();
//![5]

return a.exec();
}