qt5 QCharts使用 绘制曲线步骤

step:

1. 在*.pro中添加，并qmake

QT       += core gui sql  charts

2. 在*.ui中添加widget 并升级为QChartView

3. 程序中添加代码，绘制曲线

    QSqlTableModel *model = new QSqlTableModel;
    model->setTable("DATATABLE");

    model->select();
    if(0 == model->rowCount())
    {
        return;
    }
    QLineSeries *seriesx = new QLineSeries();
    QLineSeries *seriesy = new QLineSeries();
    QLineSeries *seriesz = new QLineSeries();
    for(int i=0;i<model->rowCount();++i)
    {
        QDateTime t = model->record(i).value(2).toDateTime();
        qreal dx = model->record(i).value(3).toDouble();
        qreal dy = model->record(i).value(4).toDouble();
        qreal dz = model->record(i).value(5).toDouble();
        seriesx->append(t.toMSecsSinceEpoch(), dx);
        seriesy->append(t.toMSecsSinceEpoch(), dy);
        seriesz->append(t.toMSecsSinceEpoch(), dz);
    }

    QDateTimeAxis *axisX = new QDateTimeAxis;
    axisX->setFormat("dd-MM-yyyy");

    seriesx->setName("x(mm)");
    seriesy->setName("y(mm)");
    seriesz->setName("z(mm)");

ui->widget->chart()->addSeries(seriesx); ui->widget->chart()->addSeries(seriesy); ui->widget->chart()->addSeries(seriesz); ui->widget->chart()->removeAxis(ui->widget->chart()->axisX());ui->widget->chart()->removeAxis(ui->widget->chart()->axisY());ui->widget->chart()->setAxisX(axisX, seriesx); ui->widget->chart()->setAxisX(axisX, seriesy); ui->widget->chart()->setAxisX(axisX, seriesz); QValueAxis *axisy = new QValueAxis; qreal max = ui->comboBox->currentText().toDouble(); axisy->setRange(-max, max); ui->widget->chart()->setAxisY(axisy,seriesx); ui->widget->chart()->setAxisY(axisy,seriesy);ui->widget->chart()->setAxisY(axisy,seriesz); ui->widget->chart()->legend()->setVisible(true); ui->widget->chart()->legend()->setAlignment(Qt::AlignBottom);