TrackballNode.hh

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//=============================================================================
//
//  CLASS TrackballNode
//
//=============================================================================


#ifndef ACG_TRACKBALL_NODE_HH
#define ACG_TRACKBALL_NODE_HH


//== INCLUDES =================================================================

// GMU
#include "BaseNode.hh"
#include "TransformNode.hh"

// Qt
#include <QEvent>
#include <QMouseEvent>

#ifdef max
#  undef max
#endif

#ifdef min
#  undef min
#endif



//== NAMESPACES ===============================================================


namespace ACG {
namespace SceneGraph {


//== CLASS DEFINITION =========================================================

              
class ACGDLLEXPORT TrackballNode : public TransformNode
{
public:
   
  
  TrackballNode( BaseNode* _parent=0,
                 const std::string& _name="<TrackballNode>" )
    : TransformNode(_parent, _name),
      drawTrackball_(false),
      drawAxes_(false),
      radius_(1.0),
      xAxis_(1.0, 0.0, 0.0),
      yAxis_(0.0, 1.0, 0.0),
      zAxis_(0.0, 0.0, 1.0)
  {}

  
  ~TrackballNode() {}

    
  ACG_CLASSNAME(TrackballNode);

  
  //
  // METHODS
  //


  void set_radius(double _r) { radius_ = _r; }
  double radius() const { return radius_; }

  
  virtual void setIdentity() {
    Vec3d vec (1.0, 1.0, 1.0);
    
    vec = scale ().transform_point(vec);
    radius_ *= vec.max ();
    TransformNode::setIdentity();
  }

  
  void set_draw_trackball(bool _b) { drawTrackball_ = _b; }
  bool draw_trackball() const { return drawTrackball_; }


  void set_draw_axes(bool _b) { drawAxes_ = _b; }
  bool draw_axes() const { return drawAxes_; }
  
  
  void draw(GLState& _state, const DrawModes::DrawMode& _drawMode);


  virtual void mouseEvent(GLState& _state, QMouseEvent* _event);
  
  
private:

  bool mapToSphere(GLState& _state, const Vec2i& _v2, Vec3d& _v3);

  
  // ELEMENTS
  bool                                 drawTrackball_,
                                       drawAxes_;
  double                               radius_;
  Vec3d                                xAxis_, yAxis_, zAxis_;
  Vec2i                                oldPoint2D_;
};


//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================
#endif // ACG_TRACKBALL_NODE_HH defined
//=============================================================================