使用多坐标轴

创建QChart 实例，隐藏图表图例并设置标题。

auto chart = new QChart;
chart->legend()->hide();
chart->setTitle("Multiple Vertical Axes in Chart");

创建QValueAxis 实例，该实例将被两个系列用作水平坐标轴，并将其添加到图表底部。该坐标轴可在多个系列之间共享，但每个系列只能有一个垂直和水平坐标轴。

auto axisX = new QValueAxis;
axisX->setTickCount(10);
chart->addAxis(axisX, Qt::AlignBottom);

创建第一个系列并添加数据。最后，将系列添加到图表中。实例化自己的 Y 轴，并将其添加到图表中。然后附加通用 X 轴和系列专用 Y 轴。在本例中，坐标轴线的颜色与系列的颜色相同，以便区分哪个坐标轴连接到哪个系列。

auto series = new QSplineSeries;
*series << QPointF(1, 5) << QPointF(3.5, 18) << QPointF(4.8, 7.5) << QPointF(10, 2.5);
chart->addSeries(series);

auto axisY = new QValueAxis;
axisY->setLinePenColor(series->pen().color());

chart->addAxis(axisY, Qt::AlignLeft);
series->attachAxis(axisX);
series->attachAxis(axisY);

同样准备另一个系列。这次使用了不同的轴类型。此外，网格线的颜色也设置为与系列的颜色相同。

series = new QSplineSeries;
*series << QPointF(1, 0.5) << QPointF(1.5, 4.5) << QPointF(2.4, 2.5) << QPointF(4.3, 12.5)
        << QPointF(5.2, 3.5) << QPointF(7.4, 16.5) << QPointF(8.3, 7.5) << QPointF(10, 17);
chart->addSeries(series);

auto axisY3 = new QCategoryAxis;
axisY3->append("Low", 5);
axisY3->append("Medium", 12);
axisY3->append("High", 17);
axisY3->setLinePenColor(series->pen().color());
axisY3->setGridLinePen((series->pen()));

chart->addAxis(axisY3, Qt::AlignRight);
series->attachAxis(axisX);
series->attachAxis(axisY3);

创建QChartView 对象，参数为QChart 。

createDefaultChartView(chart);

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