text: #ifndef MAINWINDOW_H
  #define MAINWINDOW_H
  
  #include <QMainWindow>
  #include "list.h"
  
  QT_BEGIN_NAMESPACE
  namespace Ui { class MainWindow; }
  QT_END_NAMESPACE
  
  /*!
   * \brief The MainWindow class
   */
  class MainWindow : public QMainWindow
  {
      Q_OBJECT
  
  public:
      /*!
       * \brief MainWindow
       * \param parent
       */
      MainWindow(QWidget *parent = nullptr);
      ~MainWindow();
  
  private slots:
      /*!
       * \brief on_pushButton_clicked
       */
      void on_pushButton_clicked();
  
      /*!
       * \brief on_pushButton_2_clicked
       */
      void on_pushButton_2_clicked();
  
      /*!
       * \brief on_pushButton_3_clicked
       */
      void on_pushButton_3_clicked();
  
      /*!
       * \brief on_pushButton_4_clicked
       */
      void on_pushButton_4_clicked();
  
  private:
      Ui::MainWindow *ui;
      List list;
  
      /*!
       * \brief updateDotFile
       */
      void updateDotFile();
  
      /*!
       * \brief updateImage
       */
      void updateImage();
  
      /*!
       * \brief renderImage
       */
      void renderImage();
  };
  #endif // MAINWINDOW_H
  