请写一段qt用QChart绘制梯形折线图的代码

好的，以下是用Qt的QChart绘制梯形折线图的代码示例：

// 创建QChart对象
QChart *chart = new QChart();

// 创建QLineSeries对象
QLineSeries *series = new QLineSeries();

// 添加数据点
series->append(0, 0);
series->append(1, 2);
series->append(2, 1);
series->append(3, 3);
series->append(4, 2);
series->append(5, 4);

// 设置梯形折线图
series->setUseOpenGL(true);
series->setPen(QPen(Qt::red, 2));
series->setPointLabelsVisible(true);
series->setPointLabelsFormat("@yPoint");

// 添加QLineSeries对象到QChart对象中
chart->addSeries(series);

// 创建QValueAxis对象
QValueAxis *axisX = new QValueAxis();
QValueAxis *axisY = new QValueAxis();

// 设置坐标轴范围
axisX->setRange(0, 5);
axisY->setRange(0, 5);

// 设置坐标轴标签
axisX->setTitleText("X轴");
axisY->setTitleText("Y轴");

// 添加坐标轴到QChart对象中
chart->addAxis(axisX, Qt::AlignBottom);
chart->addAxis(axisY, Qt::AlignLeft);

// 将QLineSeries对象与坐标轴关联
series->attachAxis(axisX);
series->attachAxis(axisY);

// 创建QChartView对象
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);

// 显示QChartView对象
chartView->show();

希望这段代码能够帮到你！