qt3d/examples/dynamicscene-cpp/examplescene.cpp

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#include "examplescene.h"
#include "boxentity.h"

#include <QTimer>
#include <qmath.h>

ExampleScene::ExampleScene(Qt3D::QNode *parent)
    : Qt3D::QEntity(parent)
    , m_timer(new QTimer(this))
    , m_even(true)
{
    buildScene();

    QObject::connect(m_timer, SIGNAL(timeout()), SLOT(updateScene()));
    m_timer->setInterval(500);
    m_timer->start();
}

ExampleScene::~ExampleScene()
{
    qDeleteAll(m_entities);
}

void ExampleScene::updateScene()
{
    int i = 0;
    Q_FOREACH (BoxEntity *entity, m_entities) {
        if (i % 2 == 0)
            entity->setParent(m_even ? Q_NULLPTR : this);
        else
            entity->setParent(m_even ? this : Q_NULLPTR);
        ++i;
    }
    m_even = !m_even;
}

void ExampleScene::buildScene()
{
    int count = 20;
    const float radius = 5.0f;

    for (int i = 0; i < count; ++i) {
        BoxEntity *entity = new BoxEntity;
        const float angle = M_PI * 2.0f * float(i) / count;
        entity->setAngle(angle);
        entity->setRadius(radius);
        entity->setDiffuseColor(QColor(fabs(cosf(angle)) * 255, 204, 75));
        m_entities.append(entity);
    }
}