除了单击鼠标外，还检测3D对象上的触摸

问题描述：

如何在触摸事件中使用 Qt3DRender :: QObjectPicker ?

How to use Qt3DRender::QObjectPicker with touch events?

我通过这种方法将Qt3DRender::QObjectPicker组件添加到我的Qt3D实体中:

I'm adding Qt3DRender::QObjectPicker component to my Qt3D entities by this method:

Qt3DRender::QObjectPicker *MyClass::createObjectPickerForEntity(Qt3DCore::QEntity *entity)
{
    Qt3DRender::QObjectPicker *picker = new Qt3DRender::QObjectPicker(entity);
    picker->setHoverEnabled(false);
    entity->addComponent(picker);
    connect(picker, &Qt3DRender::QObjectPicker::pressed, this, &MyClass::handlePickerPress);

    return picker;
}

我的对象选择器可用于鼠标单击，但不适用于触摸事件.有人知道我如何在智能手机上的触摸事件中使用Qt3D对象选择器吗?

My object picker works with mouse clicks, but it doesn't work with touch events. Does anybody know how I can use Qt3D object picker with touch events on smartphones?

答

@FlorianBlume帮助我解决了这个问题.使用QScreenRayCaster可以检测到Qt3D实体上的触摸.我必须在我的根实体中添加一个QScreenRayCaster组件:

@FlorianBlume helped me to solve the problem. Touch on Qt3D entities can be detected with QScreenRayCaster. I had to add a QScreenRayCaster component to my root entity:

 /*
  * You have to add the ray caster to the root entity as a component
  * Perform ray casting tests by specifying "touch" coordinates in screen space
  */
    m_screenRayCaster = new Qt3DRender::QScreenRayCaster(m_rootEntity);
    m_screenRayCaster->setRunMode(Qt3DRender::QAbstractRayCaster::SingleShot);
    m_rootEntity->addComponent(m_screenRayCaster);

 /*
  * Handle ray casting results by signal-slot connection
  * "QScreenRayCaster::hitsChanged" signal contains ray casting result for any hit
  * "MyClass::handleScreenRayCasterHits" slot needs to be implemented to handle hit results
  */
    QObject::connect(m_screenRayCaster, &Qt3DRender::QScreenRayCaster::hitsChanged, this, &MyClass::handleScreenRayCasterHits);

我使用m_screenRayCaster->trigger()方法通过类似的触摸事件触发QScreenRayCaster测试:

I trigger QScreenRayCaster tests by touch events like this using m_screenRayCaster->trigger() method:

void MyClass::HandleTouchEvent(QTouchEvent *event)
{
    switch (event->type()) {
    case QEvent::TouchBegin:
        break;
    case QEvent::TouchEnd:
        if (event->touchPoints().count() == 1) {
            QPointF point = event->touchPoints().at(0).pos();
            m_screenRayCaster->trigger(QPoint(static_cast<int>(point.x()), static_cast<int>(point.y())));
        }
        break;
    default:
        break;
    }

}

在MyClass::handleScreenRayCasterHits插槽中处理射线投射结果:

Handling ray casting results in MyClass::handleScreenRayCasterHits slot:

void MyClass::handleScreenRayCasterHits(const Qt3DRender::QAbstractRayCaster::Hits hits)
{
    for (int i = 0; i < hits.length(); ++i) {
        qDebug() << __func__ << "Hit Type: " << hits.at(i).type();
        qDebug() << __func__ << "Hit entity name: " << hits.at(i).entity()->objectName();
    }
}

除了单击鼠标外，还检测3D对象上的触摸

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