examplescene.cpp Example File

dynamicscene-cpp/examplescene.cpp

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

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

  ExampleScene::ExampleScene(Qt3DCore::QNode *parent)
      : Qt3DCore::QEntity(parent)
      , m_timer(new QTimer(this))
      , m_even(true)
  {
      QObject::connect(m_timer, SIGNAL(timeout()), SLOT(updateScene()));
      m_timer->setInterval(1200);
      m_timer->start();
  }

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

  void ExampleScene::updateScene()
  {
      if (m_entities.isEmpty()) {
          buildScene();
      } else {
          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(qFabs(qCos(angle)) * 255, 204, 75));
          m_entities.append(entity);
      }
  }