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

     QColor m_color;
 };

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

     QPixmap m_image;
 };

 #endif