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()  override{
    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) override;
 
 
  virtual void mouseEvent(GLState& _state, QMouseEvent* _event) override;
  
  
private:
 
  bool mapToSphere(const 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
//=============================================================================