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  1. 16th November 2011, 12:03 #1
    sajis997
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    Default QGraphicsItem - issue

    Hello Forum,

    I am subclassing the QGraphicsItem as follows:


    Qt Code: 
    1. class RootGraphicsItem : public QObject , public QGraphicsItem
    2. {
    3. Q_OBJECT
    4. public:
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    And i am getting the error inside the paint function :


    Qt Code: 
    1. RootGraphicsItem.cpp: In member function ‘virtual void RootGraphicsItem::paint(QPainter*, const QStyleOptionGraphicsItem*, QWidget*)’:
    2. RootGraphicsItem.cpp:473: error: invalid use of incomplete type ‘struct QPainter’
    3. /usr/include/qt4/QtGui/qwindowdefs.h:64: error: forward declaration of ‘struct QPainter’
    4. RootGraphicsItem.cpp:488: error: invalid use of incomplete type ‘struct QPainter’
    5. /usr/include/qt4/QtGui/qwindowdefs.h:64: error: forward declaration of ‘struct QPainter’
    6. RootGraphicsItem.cpp:489: error: invalid use of incomplete type ‘struct QPainter’
    7. /usr/include/qt4/QtGui/qwindowdefs.h:64: error: forward declaration of ‘struct QPainter’
    8. RootGraphicsItem.cpp:491: error: invalid use of incomplete type ‘struct QPainter’
    9. /usr/include/qt4/QtGui/qwindowdefs.h:64: error: forward declaration of ‘struct QPainter’
    10. RootGraphicsItem.cpp:492: error: invalid use of incomplete type ‘struct QPainter’
    11. /usr/include/qt4/QtGui/qwindowdefs.h:64: error: forward declaration of ‘struct QPainter’
    12. RootGraphicsItem.cpp: At global scope:
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    Any hint on what i am missing ?


    Regards
    Sajjad
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  2. 16th November 2011, 13:51 #2
    Lykurg
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    Default Re: QGraphicsItem - issue

    The error message is telling you all you need! Include QPainter:
    Qt Code: 
    1. #include <QtGui/QPainter>
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