c++ - Q3DScatter 没有出现在 QWidget 中

Question

我正在使用 QtDataVisualization 来设置单点的 3d 图。到目前为止，按照 Qt 示例中记录的方式使用相应的 Q3DScatter:

QGuiApplication app(argc, argv);

Q3DScatter scatter;
scatter.setFlags(scatter.flags() ^ Qt::FramelessWindowHint);

QScatter3DSeries *series = new QScatter3DSeries;
QScatterDataArray data;
data << QVector3D(0.5f, 0.5f, 0.5f) << QVector3D(-0.3f, -0.5f, -0.4f) << QVector3D(0.0f, -0.3f, 0.2f);
series->dataProxy()->addItems(data);
scatter.addSeries(series);

scatter.show();
return app.exec();

当我通过围绕该图包装 QWidget 对其进行修改时，该图未显示。该小部件显示为空(灰色)。

QGuiApplication app(argc, argv);

Q3DScatter scatter;
scatter.setFlags(scatter.flags() ^ Qt::FramelessWindowHint);

QWidget *container = QWidget::createWindowContainer(scatter);
QSize screenSize = scatter->screen()->size();
container->setMinimumSize(QSize(screenSize.width() / 2, screenSize.height() / 1.5));
container->setMaximumSize(screenSize);
container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
container->setFocusPolicy(Qt::StrongFocus);

QScatter3DSeries *series = new QScatter3DSeries;
QScatterDataArray data;
data << QVector3D(0.5f, 0.5f, 0.5f) << QVector3D(-0.3f, -0.5f, -0.4f) << QVector3D(0.0f, -0.3f, 0.2f);
series->dataProxy()->addItems(data);
scatter.addSeries(series);

container->show();
return app.exec();

我的代码有问题吗？

Answer 1

来自 QGuiApplication ，“对于基于 QWidget 的 Qt 应用程序，请改用 QApplication，因为它提供了创建 QWidget 实例所需的一些功能”。然后可以进行以下操作:

    //    QGuiApplication app(argc, argv);
    QApplication app(argc, argv);
    QMainWindow w;

    Q3DScatter scatter;
    scatter.setFlags(scatter.flags() ^ Qt::FramelessWindowHint);

    QWidget *container = QWidget::createWindowContainer(&scatter);    
    w.setCentralWidget(container);

    QSize screenSize = scatter.screen()->size();
    container->setMinimumSize(QSize(screenSize.width() / 2, screenSize.height() / 1.5));
    container->setMaximumSize(screenSize);
    container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
    container->setFocusPolicy(Qt::StrongFocus);

    QScatter3DSeries *series = new QScatter3DSeries;
    QScatterDataArray data;
    data << QVector3D(0.5f, 0.5f, 0.5f) << QVector3D(-0.3f, -0.5f, -0.4f) << QVector3D(0.0f, -0.3f, 0.2f);
    series->dataProxy()->addItems(data);
    scatter.addSeries(series);

//    container->show();
    w.show();

    return app.exec();