SoQtConstrainedViewer.h

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**=======================================================================*/
/*=======================================================================
** Author      : Alain Dumesny (MMM yyyy)
**=======================================================================*/
 
 
#ifndef  _SO_QT_CONSTRAINED_VIEWER_
#define  _SO_QT_CONSTRAINED_VIEWER_
#include <Inventor/Qt/OivQtCompat.h>
#include <Inventor/Qt/viewers/SoQtFullViewer.h>
#include <Inventor/SbBox.h>
 
#include <Inventor/Gui/viewers/SoGuiConstrainedViewer.h>
 
//
//  Class: SoQtConstrainedViewer
//
 
class  SoQtConstrainedViewer : public SoQtFullViewer 
{
 
  Q_OBJECT
 
    public:
    
  void setUpDirection( const SbVec3f& newUpDirection );
  SbVec3f getUpDirection() { return m_guiConstViewer->getUpDirection(); }
    
  //
  // redefine these to add constrained viewer functionality
  //
  virtual void setCamera( SoCamera* newCam );
  virtual void    saveHomePosition();
  virtual void    resetToHomePosition();
  virtual void    recomputeSceneSize();
 
  private:
  SoGuiConstrainedViewer* getGuiConstrainedViewer() const;
 
  // Retro compatibility only
  SbVec3f upDirection;
  float sceneHeight, sceneSize;
 
  private:
 
  SoQtConstrainedViewer( QWidget* parent,
                         const char* name, 
                         SbBool buildInsideParent, 
                         SoQtFullViewer::BuildFlag flag, 
                         SoQtViewer::Type type, 
                         SbBool buildNow,
                         SbBool sync = true );
    
  SoQtConstrainedViewer( QWidget* parent,
                         const char* name, 
                         SbBool buildInsideParent, 
                         SoQtFullViewer::BuildFlag flag, 
                         SoQtViewer::Type type, 
                         SbBool buildNow,
                         SbBool sync,
                         SoGuiConstrainedViewer* guiConstViewer );
 
 private:
  ~SoQtConstrainedViewer();
 
  // Tilts the camera, restraining it to 180 degree rotation from the
  // up direction. A positive angle tilts the camera up.
  virtual void tiltCamera( float deltaAngle );
    
  // Moves the camera forward by the given amount
  virtual void dollyCamera( float dist );
    
  // Redefine these to do constrained viewing tasks.
  // The bottom wheel rotates the camera around the up direction, the
  // left wheel tilts the camera up/down constraning to 180 degree from
  // the up direction. The right wheel moves the camera forward/backward
  // withough constrain (taking the scene size into account).
  virtual void bottomWheelMotion( float newVal );
  virtual void leftWheelMotion( float newVal );
  virtual void rightWheelMotion( float newVal );
  virtual void mouseWheelMotion( float newVal );
 
  // This is called during a paste.
  // We redefine this to keep the right vector of the camera
  // in a parallel plane.
  virtual void changeCameraValues( SoCamera* newCamera );
    
  // this routine is called by subclasses to find and set the new
  // up direction given the current mouse position. If something is
  // picked, the normal to the object picked will be used to specify
  // the new up direction.
  void findUpDirection( const SbVec2s& mouseLocation );
    
  // this routine checks the camera orientation and makes sure that the
  // current right vector and the ideal right vector (cross between the
  // view vector and world up direction) are the same (i.e. no unwanted
  // roll), else it fixes it. This keeps the up direction valid.
  void checkForCameraUpConstrain();
    
  // Redefine this to keep the up vector when seeking
  virtual void computeSeekFinalOrientation();
    
 private:
 
  void constructorCommon( SbBool buildNow );
  SoGuiConstrainedViewer* m_guiConstViewer; // Implementation class of SoXxConstrainedViewer
};
 
#endif  /* _SO_QT_CONSTRAINED_VIEWER_ */