必须在MainWindow.h头文件开头放

#include    <QtCharts>  //必须这么设置

创建chart：

void MainWindow::iniPiewChart()
{ //饼图初始化QChart *chart = new QChart();chart->setTitle(" Piechart演示");chart->setAnimationOptions(QChart::SeriesAnimations);ui->chartViewPie->setChart(chart);ui->chartViewPie->setRenderHint(QPainter::Antialiasing);
}

绘制chart：

void MainWindow::buildPieChart()
{ //绘制饼图QChart *chart =ui->chartViewPie->chart(); //获取chart对象chart->removeAllSeries(); //删除所有序列int colNo=1+ui->cBoxCourse->currentIndex(); //获取分析对象，数学、英语、语文或平均分QPieSeries *series = new QPieSeries(); //创建饼图序列series->setHoleSize(ui->spinHoleSize->value()); //饼图中间空心的大小for (int i=0;i<=4;i++) //添加分块数据{QTreeWidgetItem*  item=ui->treeWidget->topLevelItem(i); //获得QTreeWidgetItem的itemseries->append(item->text(0),item->text(colNo).toFloat()); //添加一个饼图分块数据,标签，数值}QPieSlice *slice; //饼图分块for(int i=0;i<=4;i++) //设置每个分块的标签文字{slice =series->slices().at(i);  //获取分块slice->setLabel(slice->label()+QString::asprintf(": %.0f人, %.1f%%",    //设置分块的标签slice->value(),slice->percentage()*100));
//信号与槽函数关联，鼠标落在某个分块上时，此分块弹出connect(slice, SIGNAL(hovered(bool)),this, SLOT(on_PieSliceHighlight(bool)));}slice->setExploded(true); //最后一个设置为explodedseries->setLabelsVisible(true); //只影响当前的slices，必须添加完slice之后再设置chart->addSeries(series); //添加饼图序列chart->setTitle("Piechart----"+ui->cBoxCourse->currentText());chart->legend()->setVisible(true); //图例chart->legend()->setAlignment(Qt::AlignRight);//Qt::AlignRight
}

设置chart样式：

ui->chartViewPie->chart()->setTheme(QChart::ChartTheme(index));