Panda3D

trackball.h

00001 // Filename: trackball.h
00002 // Created by:  drose (12Mar02)
00003 //
00004 ////////////////////////////////////////////////////////////////////
00005 //
00006 // PANDA 3D SOFTWARE
00007 // Copyright (c) Carnegie Mellon University.  All rights reserved.
00008 //
00009 // All use of this software is subject to the terms of the revised BSD
00010 // license.  You should have received a copy of this license along
00011 // with this source code in a file named "LICENSE."
00012 //
00013 ////////////////////////////////////////////////////////////////////
00014 
00015 #ifndef TRACKBALL_H
00016 #define TRACKBALL_H
00017 
00018 #include "pandabase.h"
00019 
00020 #include "mouseInterfaceNode.h"
00021 #include "nodePath.h"
00022 #include "modifierButtons.h"
00023 #include "luse.h"
00024 #include "transformState.h"
00025 
00026 
00027 ////////////////////////////////////////////////////////////////////
00028 //       Class : Trackball
00029 // Description : Trackball acts like Performer in trackball mode.  It
00030 //               can either spin around a piece of geometry directly,
00031 //               or it can spin around a camera with the inverse
00032 //               transform to make it appear that the whole world is
00033 //               spinning.
00034 //
00035 //               The Trackball object actually just places a transform
00036 //               in the data graph; parent a Transform2SG node under
00037 //               it to actually transform objects (or cameras) in the
00038 //               world.
00039 ////////////////////////////////////////////////////////////////////
00040 class EXPCL_PANDA_TFORM Trackball : public MouseInterfaceNode {
00041 PUBLISHED:
00042   Trackball(const string &name);
00043   ~Trackball();
00044 
00045   void reset();
00046 
00047   float get_forward_scale() const;
00048   void set_forward_scale(float fwdscale);
00049 
00050   /// **** Translation ****
00051 
00052   const LPoint3f &get_pos() const;
00053   float get_x() const;
00054   float get_y() const;
00055   float get_z() const;
00056   void set_pos(const LVecBase3f &vec);
00057   void set_pos(float x, float y, float z);
00058   void set_x(float x);
00059   void set_y(float y);
00060   void set_z(float z);
00061 
00062   /// **** Rotation ****
00063 
00064   LVecBase3f get_hpr() const;
00065   float get_h() const;
00066   float get_p() const;
00067   float get_r() const;
00068   void set_hpr(const LVecBase3f &hpr);
00069   void set_hpr(float h, float p, float r);
00070   void set_h(float h);
00071   void set_p(float p);
00072   void set_r(float r);
00073 
00074   /// **** Origin of Rotation ****
00075 
00076   void reset_origin_here();
00077   void move_origin(float x, float y, float z);
00078 
00079   LPoint3f get_origin() const;
00080   void set_origin(const LVecBase3f &origin);
00081 
00082   /// **** Misc ****
00083 
00084   void set_invert(bool flag);
00085   bool get_invert() const;
00086 
00087   void set_rel_to(const NodePath &rel_to);
00088   const NodePath &get_rel_to() const;
00089 
00090   void set_coordinate_system(CoordinateSystem cs);
00091   CoordinateSystem get_coordinate_system() const;
00092 
00093   void set_mat(const LMatrix4f &mat);
00094   const LMatrix4f &get_mat() const;
00095   const LMatrix4f &get_trans_mat() const;
00096 
00097 
00098 private:
00099   void apply(double x, double y, int button);
00100 
00101   void reextract();
00102   void recompute();
00103 
00104   int _last_button;
00105   float _lastx, _lasty;
00106 
00107   float _rotscale;
00108   float _fwdscale;
00109 
00110   LMatrix4f _rotation;
00111   LPoint3f _translation;
00112   LMatrix4f _mat, _orig;
00113   bool _invert;
00114   NodePath _rel_to;
00115   CoordinateSystem _cs;
00116 
00117 protected:
00118   // Inherited from DataNode
00119   virtual void do_transmit_data(DataGraphTraverser *trav,
00120                                 const DataNodeTransmit &input,
00121                                 DataNodeTransmit &output);
00122 
00123 private:
00124   // inputs
00125   int _pixel_xy_input;
00126 
00127   // outputs
00128   int _transform_output;
00129 
00130   CPT(TransformState) _transform;
00131 
00132 public:
00133   static TypeHandle get_class_type() {
00134     return _type_handle;
00135   }
00136   static void init_type() {
00137     MouseInterfaceNode::init_type();
00138     register_type(_type_handle, "Trackball",
00139                   MouseInterfaceNode::get_class_type());
00140   }
00141   virtual TypeHandle get_type() const {
00142     return get_class_type();
00143   }
00144   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00145 
00146 private:
00147   static TypeHandle _type_handle;
00148 };
00149 
00150 #endif
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