1、在pro文件中添加QT += charts。
2、在头文件中添加#include <QtCharts/QtCharts>
3、在界面使用Qt Creator添加一个QGraphicsView组件，然后提升为QChartView。
提升的时候，这样写提升为的类：QtCharts::QChartView，头文件写：qchartview.h。

截图.png

如果没有对QGraphicsView提升，可能会导致在QGraphicsView中添加的Chart不显示；若用QChartView显示Chart则不受此限制(会单独生成一个独立窗口显示)。

//QChart负责管理数据
//QChartView负责显示
折线图代码：

        QLineSeries *series = new QLineSeries();
        series->append(0, 6);
        series->append(2, 4);
        series->append(3, 8);
        series->append(7, 4);
        series->append(10, 5);
        *series << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);

        QChart *chart = new QChart();
        chart->legend()->hide();
        chart->addSeries(series);
        chart->createDefaultAxes();
        chart->setTitle("Simple line chart example");

        ui->graphicsView->setChart(chart);
        ui->graphicsView->setRenderHint(QPainter::Antialiasing);

饼图代码：

    QPieSeries *series = new QPieSeries();
    series->append("10%", 1);
    series->append("20%", 2);
    series->append("70%", 7);
    series->setLabelsVisible();

    QPieSlice *slice_red = series->slices().at(0);
    QPieSlice *slice_green = series->slices().at(1);
    QPieSlice *slice_blue = series->slices().at(2);
    slice_red->setColor(QColor(255,0,0,255));
    slice_green->setColor(QColor(0,255,0,255));
    slice_blue->setColor(QColor(0,0,255,255));

    QChart *chart = new QChart();
    chart->addSeries(series);
    chart->setTitle("PieChart Example");
    chart->legend()->hide();

    //QChartView *chartview = new QChartView(chart);
    //chartview->setRenderHint(QPainter::Antialiasing);
    //chartview->show();
    ui->graphicsView->setChart(chart);
    ui->graphicsView->setRenderHint(QPainter::Antialiasing);

效果图：

效果图.png