examplescene.cpp Example File | Qt 3D 5.6

Qt 5.6 | Qt 3D | Qt 3D: Dynamic Scene C++ Example | examplescene.cpp Example File

Qt 5.6.1 Reference Documentation

# examplescene.cpp Example File

dynamicscene-cpp/examplescene.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
      ** Contact: http://www.qt-project.org/legal
      **
      ** This file is part of the Qt3D module of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:LGPL3$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see http://www.qt.io/terms-conditions. For further
      ** information use the contact form at http://www.qt.io/contact-us.
      **
      ** GNU Lesser General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU Lesser
      ** General Public License version 3 as published by the Free Software
      ** Foundation and appearing in the file LICENSE.LGPLv3 included in the
      ** packaging of this file. Please review the following information to
      ** ensure the GNU Lesser General Public License version 3 requirements
      ** will be met: https://www.gnu.org/licenses/lgpl.html.
      **
      ** GNU General Public License Usage
      ** Alternatively, this file may be used under the terms of the GNU
      ** General Public License version 2.0 or later as published by the Free
      ** Software Foundation and appearing in the file LICENSE.GPL included in
      ** the packaging of this file. Please review the following information to
      ** ensure the GNU General Public License version 2.0 requirements will be
      ** met: http://www.gnu.org/licenses/gpl-2.0.html.
      **
      ** $QT_END_LICENSE$
      **
      ****************************************************************************/

      #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);
          }
      }