QT QCharts添加和删除系列

QT QCharts add and remove series

本文关键字：删除 系列 添加 QCharts QT      更新时间：2023-10-16

我应该如何添加和删除系列从qchart?

主要的混乱是QChart如何存储QAxis和QSeries, QSeries本身引用QAxis。除此之外，所有的物体都是紧密相连的。

而不是像这样的伪代码 
 void someclass::set_series(QLineSeries*someQLineSeries){
 somechart->removeAllSeries();
 somechart->removeAllAxis();
 somechart->addSeries(someQLineSeries);
 }

我应该这样用:(zlineseries额外存储2个指针到它的轴)

void zhplotview::attach_dt_series(ZLineSeries *series)
if(chart)
{
    qDebug()<<"NOT DELETED CHART";
    if(viewer)
    {
        qDebug()<<"NOT DELETED VIEWER";
        qDebug()<<"Okay. Try to clear old links and create chart again";
        //let chart have 1 series
        auto slist=chart->series();
        ZLineSeries *old_series=dynamic_cast<ZLineSeries*>(slist.at(0));
        old_series->detachAxis(old_series->axis_x);
        old_series->detachAxis(old_series->axis_y);
        chart->removeAxis(old_series->axis_x);
        chart->removeAxis(old_series->axis_y);
        vbl->removeWidget(viewer);
        chart->removeSeries(old_series);
        disconnect(viewer);
        disconnect(chart);
        delete chart;
        delete viewer;
    }
    else
    {
        qDebug()<<"chart is 0, but viewer not";
        return;
    }
}
chart=new QChart();
chart->addSeries(series);
chart->addAxis(series->axis_x,Qt::AlignBottom);
chart->addAxis(series->axis_y,Qt::AlignLeft);
series->attachAxis(series->axis_x);
series->attachAxis(series->axis_y);
viewer=new QZChartView(chart,this);
vbl->addWidget(viewer);

我知道这是三年之后，但我使用了一个小的变通方法，也许有人会感兴趣。

对于每个delta，我生成一个新的图表，然后替换旧的。为了足够快，我在堆栈中保留了一些预先计算过的数据。

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