Panda3D

collisionHandlerGravity.h

00001 // Filename: CollisionHandlerGravity.h
00002 // Created by:  drose (16Mar02)
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 CollisionHandlerGravity_H
00016 #define CollisionHandlerGravity_H
00017 
00018 #include "pandabase.h"
00019 
00020 #include "collisionHandlerPhysical.h"
00021 
00022 ////////////////////////////////////////////////////////////////////
00023 //       Class : CollisionHandlerGravity
00024 // Description : A specialized kind of CollisionHandler that sets the
00025 //               Z height of the collider to a fixed linear offset
00026 //               from the highest detected collision point each frame.
00027 //               It's intended to implement walking around on a floor
00028 //               of varying height by casting a ray down from the
00029 //               avatar's head.
00030 ////////////////////////////////////////////////////////////////////
00031 class EXPCL_PANDA_COLLIDE CollisionHandlerGravity : public CollisionHandlerPhysical {
00032 PUBLISHED:
00033   CollisionHandlerGravity();
00034   virtual ~CollisionHandlerGravity();
00035 
00036   INLINE void set_offset(PN_stdfloat offset);
00037   INLINE PN_stdfloat get_offset() const;
00038 
00039   INLINE void set_reach(PN_stdfloat reach);
00040   INLINE PN_stdfloat get_reach() const;
00041 
00042   INLINE PN_stdfloat get_airborne_height() const;
00043   INLINE bool is_on_ground() const;
00044   INLINE PN_stdfloat get_impact_velocity() const;
00045   INLINE const LVector3 &get_contact_normal() const;
00046 
00047   INLINE void add_velocity(PN_stdfloat velocity);
00048   INLINE void set_velocity(PN_stdfloat velocity);
00049   INLINE PN_stdfloat get_velocity() const;
00050 
00051   INLINE void set_gravity(PN_stdfloat gravity);
00052   INLINE PN_stdfloat get_gravity() const;
00053 
00054   INLINE void set_max_velocity(PN_stdfloat max_vel);
00055   INLINE PN_stdfloat get_max_velocity() const;
00056 
00057   INLINE void set_legacy_mode(bool legacy_mode);
00058   INLINE bool get_legacy_mode() const;
00059 
00060 protected:
00061   PN_stdfloat set_highest_collision(const NodePath &target_node_path, const NodePath &from_node_path, const Entries &entries);
00062   virtual bool handle_entries();
00063   virtual void apply_linear_force(ColliderDef &def, const LVector3 &force);
00064 
00065 private:
00066   PN_stdfloat _offset;
00067   PN_stdfloat _reach;
00068   PN_stdfloat _airborne_height;
00069   PN_stdfloat _impact_velocity;
00070   PN_stdfloat _gravity;
00071   PN_stdfloat _current_velocity;
00072   PN_stdfloat _max_velocity;
00073   LVector3 _contact_normal;
00074   bool _legacy_mode;
00075 
00076 
00077 public:
00078   static TypeHandle get_class_type() {
00079     return _type_handle;
00080   }
00081   static void init_type() {
00082     CollisionHandlerPhysical::init_type();
00083     register_type(_type_handle, "CollisionHandlerGravity",
00084                   CollisionHandlerPhysical::get_class_type());
00085   }
00086   virtual TypeHandle get_type() const {
00087     return get_class_type();
00088   }
00089   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00090 
00091 private:
00092   static TypeHandle _type_handle;
00093 };
00094 
00095 #include "collisionHandlerGravity.I"
00096 
00097 #endif
00098 
00099 
00100 
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