在子线程中对声明的QChartView使用Grab()截图出错，这是不能这么用吗？

[buyer]

#include "mywork.h"

mywork::mywork(QObject *parent)
    : QObject{parent}, QRunnable()
{
    setAutoDelete(true);
}
mywork::~mywork()
{

}
void mywork::run()
{
    chartView = new QChartView();

//     pixvis = chartView->grab();
    chartsatvis = chartView->chart();
    aXsatvis = new QValueAxis();
    aYsatvis = new QValueAxis();
    ss = new QScatterSeries[5];

    int eph = 2880;
    chartsatvis->setContentsMargins(0, 0, 0, 0);
    chartsatvis->setMargins(QMargins(0, 0, 0, 0));
    aXsatvis->setTitleText("历元");
    aXsatvis->setRange(0, eph);
    aXsatvis->setLabelFormat("%d");


    aYsatvis->setTitleText("卫星");
    aYsatvis->setRange(0, 4);
    aYsatvis->setLabelFormat("%d");
//    QPixmap pixvis = chartView->grab();

    chartsatvis->addAxis(aXsatvis, Qt::AlignBottom);
    chartsatvis->addAxis(aYsatvis, Qt::AlignLeft);

//    QChart* af = chartView->chart();

    QPixmap pixvis = chartView->grab();
    chartView->setChart(chartsatvis);

    pixvis = chartView->grab();
    for (int i=0; i<5; i++)
    {
        for (int j=0; j<2880; j++){
            ss[i].append(j, i);
        }
        int r=fmod(rand(), 255);
        int g=fmod(rand(), 255);
        int b=fmod(rand(), 255);
        QVector<QPointF> sd = ss[i].pointsVector();
//        ss[i].setColor(QColor(r, g, b));
//        ss[i].setUseOpenGL(true);
        ss[i].setMarkerShape(QScatterSeries::MarkerShapeCircle);
        ss[i].setBorderColor(QColor(r, g, b));
        ss[i].setBrush(QBrush(QColor(r, g, b)));
        ss[i].setMarkerSize(2);
        chartsatvis->addSeries(&ss[i]);
        ss[i].attachAxis(aXsatvis);
        ss[i].attachAxis(aYsatvis);

    }

    pixvis = chartView->grab();
    pixvis.save("fileName.png");
}

[yongong.yu]

当然不行，QWidget及其子类只能在主线程中创建运行。