main.cpp Example File

bigscene-cpp/main.cpp

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  #include "entity.h"

  #include <QGuiApplication>
  #include <window.h>

  #include <QPropertyAnimation>
  #include <QUrl>
  #include <QTimer>
  #include <Qt3DCore/QEntity>
  #include <Qt3DCore/QCamera>
  #include <Qt3DCore/QTransform>
  #include <Qt3DCore/qaspectengine.h>
  #include <Qt3DInput/QInputAspect>
  #include <Qt3DRender/QParameter>
  #include <Qt3DRender/QFrameGraph>
  #include <Qt3DRender/QCylinderMesh>
  #include <Qt3DRender/QRenderAspect>
  #include <Qt3DRender/QCameraSelector>
  #include <Qt3DRender/QPhongMaterial>
  #include <Qt3DRender/QForwardRenderer>
  #include <qmath.h>

  using namespace Qt3DCore;
  using namespace Qt3DRender;

  int main(int ac, char **av)
  {
      QGuiApplication app(ac, av);

      Window view;
      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);
      QEntity *root = new QEntity();

      // Camera
      QCamera *cameraEntity = new QCamera(root);
      cameraEntity->setObjectName(QStringLiteral("cameraEntity"));
      cameraEntity->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
      cameraEntity->setPosition(QVector3D(0, -250.0f, -50.0f));
      cameraEntity->setUpVector(QVector3D(0, 1, 0));
      cameraEntity->setViewCenter(QVector3D(0, 0, 0));
      input->setCamera(cameraEntity);

      // FrameGraph
      QFrameGraph *frameGraph = new QFrameGraph();
      QForwardRenderer *forwardRenderer = new QForwardRenderer();
      forwardRenderer->setCamera(cameraEntity);
      forwardRenderer->setClearColor(Qt::black);
      frameGraph->setActiveFrameGraph(forwardRenderer);
      root->addComponent(frameGraph);

      const float radius = 100.0f;
      const int max = 1000;
      const float det = 1.0f / max;

      // Scene
      for (int i = 0; i < max; i++) {
          Entity *e = new Entity();
          const float angle = M_PI * 2.0f * i * det * 10.;

          e->setDiffuseColor(QColor(qFabs(qCos(angle)) * 255, 204, 75));
          e->setPosition(QVector3D(radius * qCos(angle), 200.* i * det, radius * qSin(angle)));
          e->setTheta(30.0f * i);
          e->setPhi(45.0f * i);

          QPropertyAnimation *animX = new QPropertyAnimation(e, QByteArrayLiteral("theta"));
          animX->setDuration(2400 * (i + 1));
          animX->setStartValue(QVariant::fromValue(i * 30.0f));
          animX->setEndValue(QVariant::fromValue((i + 1) * 390.0f));
          animX->setLoopCount(-1);
          animX->start();

          QPropertyAnimation *animZ = new QPropertyAnimation(e, QByteArrayLiteral("phi"));
          animZ->setDuration(2400 * (i + 1));
          animZ->setStartValue(QVariant::fromValue(i * 20.0f));
          animZ->setEndValue(QVariant::fromValue((i + 1) * 380.0f));
          animZ->setLoopCount(-1);
          animZ->start();

          e->setParent(root);
      }

      engine.setRootEntity(root);
      view.show();

      if (app.arguments().contains(("--bench")))
          QTimer::singleShot(25 * 1000, &app, &QCoreApplication::quit);

      return app.exec();
  }