How to add label or button in QOpenGL widget?

[Bat_man]

Hello, I use QT5.6 to display 3D frame.
I study this example, it run well.
But now I want add text or button in this widget (shown as followed pic) and don't know how.

I tried to add it in Window or main widget, but it fail.

Window::Window(QWindow *screen)
    : QWindow(screen)

{
    setSurfaceType(QSurface::OpenGLSurface);

    resize(1024, 768);

    QSurfaceFormat format;
    if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL) {
        format.setVersion(4, 3);
        format.setProfile(QSurfaceFormat::CoreProfile);
    }
    format.setDepthBufferSize( 24 );
    format.setSamples( 4 );
    format.setStencilBufferSize(8);
    setFormat(format);
    createDisplayInfo();
    create();
}

void Window::createDisplayInfo()
{
    QRect geo = this->geometry();
    const QString styleSheet = "background-color: rgb(0, 0, 0); color: rgb(255, 255, 255);";

    QLabel *lable = new QLabel();
    lable->setText("hello world:");
    lable->setGeometry(10, geo.bottom() - 10 - 130, 50, 15);
    lable->setStyleSheet(styleSheet);
}

it fail, try another one...

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    Window *view = new Window();

    // initWidget
    QWidget *container = QWidget::createWindowContainer(view);
    QSize screenSize = view->screen()->size();
    container->setMinimumSize(QSize(200, 100));
    container->setMaximumSize(screenSize);

    QWidget *widget = new QWidget;
    QHBoxLayout *hLayout = new QHBoxLayout(widget);
    QVBoxLayout *vLayout = new QVBoxLayout();
    vLayout->setAlignment(Qt::AlignTop);
    hLayout->addWidget(container, 1);
    hLayout->addLayout(vLayout);

    widget->setWindowTitle(QStringLiteral("Basic shapes"));
    QRect geo = widget->geometry();
    const QString styleSheet = "background-color: rgb(0, 0, 0); color: rgb(255, 255, 255);";

    QLabel *lable = new QLabel();
    lable->setText("hello world:");
    lable->setGeometry(10, geo.bottom() - 10 - 130, 50, 15);
    lable->setStyleSheet(styleSheet);

fail again...

Any one can help me, please!

[SGaist]

Hi,

You don't call show on the widget you create in your Window class.

[Bat_man]

@SGaist said in How to add label or button in QOpenGL widget?:

call show on the widget

Thanks for your reply.
Yes, off course call show, it's done at last code.

int main(int argc, char **argv)
{
    QApplication app(argc, argv);
    Window *view = new Window();

    // initWidget
    QWidget *container = QWidget::createWindowContainer(view);
    QSize screenSize = view->screen()->size();
    container->setMinimumSize(QSize(200, 100));
    //container->setMaximumSize(screenSize);
    container->setMaximumSize(view->geometry().size());
    QWidget *widget = new QWidget;
    QHBoxLayout *hLayout = new QHBoxLayout(widget);
    QVBoxLayout *vLayout = new QVBoxLayout();
    vLayout->setAlignment(Qt::AlignTop);
    hLayout->addWidget(container, 1);
    hLayout->addLayout(vLayout);

    widget->setWindowTitle(QStringLiteral("Basic shapes"));
    QRect geo = widget->geometry();
    const QString styleSheet = "background-color: rgb(0, 0, 0); color: rgb(255, 255, 255);";

    QLabel *lable = new QLabel();
    lable->setText("hello world:");
    lable->setGeometry(10, geo.bottom() - 10, 50, 15);
    lable->setStyleSheet(styleSheet);


    // initEngine
    Qt3DCore::QAspectEngine engine;
    engine.registerAspect(new Qt3DRender::QRenderAspect());
    Qt3DInput::QInputAspect *input = new Qt3DInput::QInputAspect;
    engine.registerAspect(input);
    QVariantMap data;
    data.insert(QStringLiteral("surface"), QVariant::fromValue(static_cast<QSurface *>(view)));
    data.insert(QStringLiteral("eventSource"), QVariant::fromValue(view));
    engine.setData(data);

    // Root entity
    Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();//创建顶层实体rootEntity

    // Camera
    Qt3DCore::QCamera *cameraEntity = new Qt3DCore::QCamera(rootEntity);//在新创建的rootEntity里面添加摄像机
    cameraEntity->setObjectName(QStringLiteral("cameraEntity"));

    cameraEntity->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
    cameraEntity->setPosition(QVector3D(0, 0, -20.0f));//设定摄像机初始位置
    cameraEntity->setUpVector(QVector3D(0, 1, 0));
    cameraEntity->setViewCenter(QVector3D(0, 0, 0));//设定一进入的中心点
    input->setCamera(cameraEntity);//使摄像机能左右转动
//    input->setUserData();
//    input->setProperty()

    // FrameGraph
    Qt3DRender::QFrameGraph *frameGraph = new Qt3DRender::QFrameGraph();
    Qt3DRender::QForwardRenderer *forwardRenderer = new Qt3DRender::QForwardRenderer();

    forwardRenderer->setCamera(cameraEntity);//架设摄像机
    forwardRenderer->setClearColor(QColor(QRgb(0x4d4d4f)));//设置前端背景颜色
    frameGraph->setActiveFrameGraph(forwardRenderer);//激活frameGraph

    // Setting the FrameGraph
    rootEntity->addComponent(frameGraph);
#if 1
    // Scenemodifier
    SceneModifier *modifier = new SceneModifier(rootEntity);
modifier->addLabel(1, 10, 10, 10);
    // Set root object of the scene
    engine.setRootEntity(rootEntity);

    // Create control widgets
//    QCommandLinkButton *info = new QCommandLinkButton();
//    info->setText(QStringLiteral("Qt3D ready-made meshes"));
//    info->setDescription(QStringLiteral("Qt3D provides several ready-made meshes, like torus, cylinder, cube and sphere."));
//    info->setIconSize(QSize(0,0));

    QCheckBox *torusCB = new QCheckBox(widget);
    torusCB->setChecked(true);
    torusCB->setText(QStringLiteral("Torus"));

    QCheckBox *cylinderCB = new QCheckBox(widget);
    cylinderCB->setChecked(true);
    cylinderCB->setText(QStringLiteral("Cylinder"));

    QCheckBox *cuboidCB = new QCheckBox(widget);
    cuboidCB->setChecked(true);
    cuboidCB->setText(QStringLiteral("Cuboid"));

    QCheckBox *sphereCB = new QCheckBox(widget);
    sphereCB->setChecked(true);
    sphereCB->setText(QStringLiteral("Sphere"));

//    vLayout->addWidget(info);
    vLayout->addWidget(torusCB);
    vLayout->addWidget(cylinderCB);
    vLayout->addWidget(cuboidCB);
    vLayout->addWidget(sphereCB);

    QObject::connect(torusCB, &QCheckBox::stateChanged,
                     modifier, &SceneModifier::enableTorus);
    QObject::connect(cylinderCB, &QCheckBox::stateChanged,
                     modifier, &SceneModifier::enableCylinder);
    QObject::connect(cuboidCB, &QCheckBox::stateChanged,
                     modifier, &SceneModifier::enableCuboid);
    QObject::connect(sphereCB, &QCheckBox::stateChanged,
                     modifier, &SceneModifier::enableSphere);

    torusCB->setChecked(true);
    cylinderCB->setChecked(true);
    cuboidCB->setChecked(true);
    sphereCB->setChecked(true);
#endif

    // Show window
    widget->show();
    widget->resize(1200, 800);

    // Update the aspect ratio
    QSize widgetSize =  container->size();
    float aspectRatio = float(widgetSize.width()) / float(widgetSize.height());
    cameraEntity->lens()->setPerspectiveProjection(45.0f, aspectRatio, 0.1f, 1000.0f);
    return app.exec();
}

[SGaist]

I am talking about:
@Bat_man said in How to add label or button in QOpenGL widget?:

createDisplayInfo

[Bat_man]

@SGaist said in How to add label or button in QOpenGL widget?:

createDisplayInfo

Sorry I don't understand what's your mean, what show...

[SGaist]

@Bat_man said in How to add label or button in QOpenGL widget?:

createDisplayInfo

In that method you are creating a new label, however, you don't call show on it.