qtbox.h Example File

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  #ifndef QTBOX_H
  #define QTBOX_H

  #include <QtWidgets>

  #include <QtGui/qvector3d.h>
  #include "glbuffers.h"

  class ItemBase : public QGraphicsItem
  {
  public:
      enum { Type = UserType + 1 };

      ItemBase(int size, int x, int y);
      virtual ~ItemBase();
      QRectF boundingRect() const override;
      void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
  protected:
      virtual ItemBase *createNew(int size, int x, int y) = 0;
      void contextMenuEvent(QGraphicsSceneContextMenuEvent *event) override;
      void mouseMoveEvent(QGraphicsSceneMouseEvent *event) override;
      void hoverMoveEvent(QGraphicsSceneHoverEvent *event) override;
      void mousePressEvent(QGraphicsSceneMouseEvent *event) override;
      void mouseReleaseEvent(QGraphicsSceneMouseEvent *event) override;
      void keyPressEvent(QKeyEvent *event) override;
      void wheelEvent(QGraphicsSceneWheelEvent *event) override;
      int type() const override;
      bool isInResizeArea(const QPointF &pos);

      static void duplicateSelectedItems(QGraphicsScene *scene);
      static void deleteSelectedItems(QGraphicsScene *scene);
      static void growSelectedItems(QGraphicsScene *scene);
      static void shrinkSelectedItems(QGraphicsScene *scene);

      int m_size;
      QTime m_startTime;
      bool m_isResizing;
  };

  class QtBox : public ItemBase
  {
  public:
      QtBox(int size, int x, int y);
      virtual ~QtBox();
      void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
  protected:
      ItemBase *createNew(int size, int x, int y) override;
  private:
      QVector3D m_vertices[8];
      QVector3D m_texCoords[4];
      QVector3D m_normals[6];
      GLTexture *m_texture;
  };

  class CircleItem : public ItemBase
  {
  public:
      CircleItem(int size, int x, int y);
      void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
  protected:
      ItemBase *createNew(int size, int x, int y) override;

      QColor m_color;
  };

  class SquareItem : public ItemBase
  {
  public:
      SquareItem(int size, int x, int y);
      void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override;
  protected:
      ItemBase *createNew(int size, int x, int y) override;

      QPixmap m_image;
  };

  #endif