screensaver.h

#ifndef SCREENSAVER_H
#define SCREENSAVER_H

#include <QQuickWindow>

#include <random>
#include <QRandomGenerator>
#include <QElapsedTimer>

#include <QQuickFramebufferObject>
#include <QOpenGLFramebufferObject>

#include "stick.h"

class Screensaver : public QQuickFramebufferObject
{
  Q_OBJECT

public:
  Renderer *createRenderer() const override;

};

class StickRenderer : public QQuickFramebufferObject::Renderer, protected QOpenGLFunctions
{
public:
  StickRenderer();

  qint64 elapsed() const { return _timer.elapsed(); }

  void initializeGLCanvas();
  void resizeGLCanvas(int width, int height);
  void paintGLCanvas();

protected:
  void render() override;
  QOpenGLFramebufferObject *createFramebufferObject(const QSize &size) override;
  void synchronize(QQuickFramebufferObject *item) override;




private:
  QVector<Stick*> _barSticks;

  std::uniform_real_distribution<qreal> randomX, randomY, randomRadius;
  std::uniform_real_distribution<qreal> randomFrequency, randomRatioRotation;

  QElapsedTimer _timer;
};

#endif // SCREENSAVER_H