В чем ошибка?

class AbstractGraphicsFigure : public QGraphicsItem
{
public:
    AbstractGraphicsFigure();
    inline void setType(FigureType TYPE) { type = TYPE; }
    inline FigureType getType() { return type; }
    inline QRectF boundingRect() const { return bounding_rect; }
    inline QRectF getBoundingRect() { return bounding_rect; }
    inline void setBoundingRect (QRectF rect) { bounding_rect = rect; }
 
    virtual FigureType figureType() = 0;
    virtual void updateModel() = 0; //name = updateModel();
    virtual bool Move(QPoint point) = 0;
    virtual bool Crossing() = 0;
    virtual void Scale(float f);
 
    inline void setModel(Figure *Model) { model = Model; updateModel(); update(bounding_rect); }
    inline Figure *getModel() { return model; }
 
private:
    FigureType type;
    Figure *model;
    QRectF bounding_rect;
};

class Figure
{
public:
    Figure ();
    ~Figure ();
 
    inline QPoint Center() { return center; }
    inline void setCenter(QPoint c) { center = c; }
    inline void Add (Figure *figure) { childrens->push_front(figure); }
    inline QList<Figure*> *Contain() { return childrens; }
    inline void setParent(Figure *Parent) { parent = Parent; }
    inline Figure *getParent() { return parent; }
 
    virtual void Scale(float f) = 0;
 
 
private:
    QPoint center;
    Figure *parent;
    QList<Figure*> *childrens;
};

class Triangle : public Figure
{
public:
    Triangle();
    Triangle(float rad, QPoint c);
    inline QPoint Top() { return top; }
    inline QPoint BottomLeft() { return bottom_left; }
    inline QPoint BottomRight() { return bottom_right; }
    inline float Radius() { return radius; }
    void Set (float rad, QPoint c);
 
    void Scale(float f);
 
private:
    float radius;
    QPoint top;
    QPoint bottom_left;
    QPoint bottom_right;
};

class TriangleItem : public AbstractGraphicsFigure
{
public:
    TriangleItem(Triangle *Model);
 
    void updateModel();
    bool Move(QPoint point) {return true;}
    bool Crossing() {return true;}
 
    FigureType figureType() { return TRIANGLE; }
    QPainterPath shape() const;
    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);
    
 
private:
 
};

QPainterPath TriangleItem::shape() const
{
    Triangle *model = static_cast<Triangle*>(getModel());
    QPainterPath path;
    QPolygon polygon;
    polygon << model->Top() << model->BottomLeft() << model->BottomRight();
    path.addPolygon(polygon);
    return path;
}

Triangle *model = static_cast<Triangle*>(getModel());