Hi!

I'm trying to do a subclass of QGraphicsScene to draw a OpenGL scene into a QT's widget and when I compile this it give me the follow error:

'm_backgroundColor' was not declared in this scope

I am looking for the problem and I don't find it.
Please, I hope someone can help me.

I'm using KDevelop 3.5.10 and QT4
This is my code:
Qt Code: 
  1. //************************ 
  2. // openglscene.h 
  3. //************************ 
  4. #ifndef OPENGLSCENE_H 
  5. #define OPENGLSCENE_H 
  6.  
  7. #include <QtCore/QString> 
  8. #include <QtCore/QTimer> 
  9. #include <QtGui/QKeyEvent> 
  10. #include <QtGui/QApplication> 
  11. #include <QtOpenGL/QGLWidget> 
  12. #include <QtGui/QMainWindow> 
  13. #include <QtGui/QMdiSubWindow> 
  14. #include <QtGui/QMdiArea> 
  15. #include <QGraphicsView> 
  16. #include <QGraphicsScene> 
  17. #include <QTextCursor> 
  18. #include <QDialog> 
  19. #include <QKeyEvent> 
  20. #include <QFile> 
  21. #include <QTextStream> 
  22. #include <QMessageBox> 
  23. #include <QMenu> 
  24. #include <QTextDocumentFragment> 
  25. #include <QScrollBar> 
  26. #include <QPainter> 
  27. #include <QDebug> 
  28. #include <QListWidget> 
  29. #include <QProcess> 
  30. #include <QClipboard> 
  31. #include <QFileInfo> 
  32. #include <QPrintDialog> 
  33. #include <QTime> 
  34. #include <QTextLayout> 
  35. #include <QTextCodec> 
  36. #include <QDir> 
  37. #include <QPaintEngine> 
  38. #include <QColormap> 
  39. #include <QtCore> 
  40. #include <QtGui> 
  41. #include <QtOpenGL> 
  42.  
  43. using namespace std; 
  44.  
  45. class OpenGLScene : public QGraphicsScene{	
  46.    public: 
  47.       OpenGLScene(); 
  48.  
  49.    protected: 
  50.       void drawBackground ( QPainter *painter, const QRectF & ); 
  51. }; 
  52. #endif 
  53.  
  54. //************************ 
  55. // openglscene.cpp 
  56. //************************ 
  57. #include "openglscene.h" 
  58.  
  59. OpenGLScene:penGLScene(){} 
  60.  
  61. void OpenGLScene::drawBackground ( QPainter *painter, const QRectF & ){ 
  62.    if ( painter->paintEngine()->type() != QPaintEngine:penGL ){ 
  63.       qWarning ( "OpenGLScene: drawBackground needs a QGLWidget to be set as viewport on the graphics view" ); 
  64.       return; 
  65.    } 
  66.  
  67.    glClearColor( m_backgroundColor.redF(), m_backgroundColor.greenF(), m_backgroundColor.blueF(), 1.0f ); 
  68.    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
  69. }
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