多个Y坐标轴示例代码
QChart *chart = new QChart();
chart->legend()->hide();
chart->setTitle("Multiaxis chart example");
QValueAxis *axisX = new QValueAxis;
axisX->setTickCount(10);
chart->addAxis(axisX, Qt::AlignBottom);
QSplineSeries *series = new QSplineSeries;
*series << QPointF(1, 5) << QPointF(3.5, 18) << QPointF(4.8, 7.5) << QPointF(10, 2.5);
chart->addSeries(series);
QValueAxis *axisY = new QValueAxis;
axisY->setLinePenColor(series->pen().color());
chart->addAxis(axisY, Qt::AlignLeft);
series->attachAxis(axisX);
series->attachAxis(axisY);
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);
QCategoryAxis *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);
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
时间轴QDateTimeAxis 使用示例
QChart *chart = new QChart();
chart->addSeries(series);
chart->legend()->hide();
chart->setTitle("Sunspots count (by Space Weather Prediction Center)");
QDateTimeAxis *axisX = new QDateTimeAxis;
axisX->setTickCount(10);
axisX->setFormat("MMM yyyy");
axisX->setTitleText("Date");
chart->addAxis(axisX, Qt::AlignBottom);
series->attachAxis(axisX);
QValueAxis *axisY = new QValueAxis;
axisY->setLabelFormat("%i");
axisY->setTitleText("Sunspots count");
chart->addAxis(axisY, Qt::AlignLeft);
series->attachAxis(axisY);
QChartView *chartView = new QChartView(chart);
chartView->setRenderHint(QPainter::Antialiasing);
QT中SMAPLE代码,作为备忘。