QGraphicsItem与QGraphicsRectItem是继承的关系吗？急

cll

1. #ifndef SHAPE_H
   
2. #define SHAPE_H
   
3. #include <QtGui>
   
4. #include <QGraphicsSceneMouseEvent>
   
5. #include <QGraphicsItem>
   
6. #include <QObject>
   
7. class Shape{//Q_OBJECT
   
8. public:
   
9.     enum Code { Line, Rect, Ellipse};
   
10.     Shape();
    
11.     virtual void startDraw(QGraphicsSceneMouseEvent *event) = 0;
    
12.     virtual void drawing(QGraphicsSceneMouseEvent *event) = 0;
    
13.     virtual QPointF reTurnStartPoint() = 0;
    
14.     virtual QPointF reTurnEndPoint() = 0;
    
15.     virtual int reTurenShape() = 0 ;
    
16.     virtual void storeStartPoint(int p1,int p2) = 0;
    
17.     virtual void storeEndPoint(int p1,int p2) = 0;
    
18.     virtual void reDrawing() = 0;
    
19.     virtual void setZvalue(int m_Zvalue) = 0;
    
20. };
    
21. #endif // SHAPE_H

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1. #define RECT_H
   
2. #include <QGraphicsRectItem>
   
3. #include "shape.h"
   
4. #include <QDebug>
   
5. #include <QCursor>
   
6. #include <QKeyEvent>
   
7. #include <QGraphicsSceneHoverEvent>
   
8. #include <QGraphicsSceneContextMenuEvent>
   
9. #include <QMenu>
   
10. #include <QMouseEvent>
    
11. #include <QWheelEvent>
    
12. #include <QGraphicsEffect>
    
13. class Rect : public Shape,public QGraphicsRectItem   {
    
14. public:    Rect();   // Rect();   
    
15.     void startDraw(QGraphicsSceneMouseEvent *event);   
    
16.     void drawing(QGraphicsSceneMouseEvent *event);   
    
17.     QPointF reTurnStartPoint();   
    
18.     QPointF reTurnEndPoint();   
    
19.     int reTurenShape();   
    
20.     void storeStartPoint(int p1,int p2);   
    
21.     void storeEndPoint(int p1,int p2);   
    
22.     void reDrawing();   
    
23.     void setZvalue(int m_Zvalue);   
    
24.     void setItemBrush();
    
25.    
    
26.    
    
27.     void mousePressEvent(QGraphicsSceneMouseEvent *event);   
    
28.     void keyPressEvent(QKeyEvent *event);   
    
29.     void hoverEnterEvent(QGraphicsSceneHoverEvent *event);   
    
30.     void wheelEvent(QGraphicsSceneWheelEvent *event);   
    
31.     void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
    
32.    
    
33.     void redrawing();   
    
34.     int m_Z ;   
    
35.     int m_Shape;
    
36.    
    
37. private:    QPointF m_storeStartPoint,m_storeEndPoint;
    
38. };
    
39. #endif // RECT_H

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这是建立矩形类，继承QGraphicsRectItem，我想知道声明一个shape 指针，能否用这个指针去指向Rect对像

yafeilinux

QGraphicsRectItem继承自QAbstractGraphicsShapeItem，而QAbstractGraphicsShapeItem继承自QGraphicsItem。

关于图形视图部分的编程，建议先看下：

http://www.qter.org/forum.php?mod=viewthread&tid=125

然后看下《Qt及Qt Quick开发实战讲解》上的第二个方块游戏例子。

cll

yafeilinux 发表于 2013-9-25 16:26
QGraphicsRectItem继承自QAbstractGraphicsShapeItem，而QAbstractGraphicsShapeItem继承自QGraphicsItem。 ...

thanks,我这有您写的两本书，有那个方块的例子，我先去看看