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linearDistanceForce.h
00001 // Filename: linearDistanceForce.h
00002 // Created by:  charles (21Jun00)
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 LINEARDISTANCEFORCE_H
00016 #define LINEARDISTANCEFORCE_H
00017 
00018 #include "linearForce.h"
00019 
00020 class BamReader;
00021 
00022 ////////////////////////////////////////////////////////////////////
00023 //       Class : LinearDistanceForce
00024 // Description : Pure virtual class for sinks and sources
00025 ////////////////////////////////////////////////////////////////////
00026 class EXPCL_PANDAPHYSICS LinearDistanceForce : public LinearForce {
00027 PUBLISHED:
00028   enum FalloffType {
00029     FT_ONE_OVER_R,
00030     FT_ONE_OVER_R_SQUARED,
00031     FT_ONE_OVER_R_CUBED
00032   };
00033 
00034   INLINE void set_radius(PN_stdfloat r);
00035   INLINE void set_falloff_type(FalloffType ft);
00036   INLINE void set_force_center(const LPoint3& p);
00037 
00038   INLINE PN_stdfloat get_radius() const;
00039   INLINE FalloffType get_falloff_type() const;
00040   INLINE LPoint3 get_force_center() const;
00041 
00042   INLINE PN_stdfloat get_scalar_term() const;
00043   
00044   virtual void output(ostream &out) const;
00045   virtual void write(ostream &out, unsigned int indent=0) const;
00046 
00047 private:
00048   LPoint3 _force_center;
00049 
00050   FalloffType _falloff;
00051   PN_stdfloat _radius;
00052 
00053   virtual LinearForce *make_copy() = 0;
00054   virtual LVector3 get_child_vector(const PhysicsObject *po) = 0;
00055 
00056 protected:
00057   LinearDistanceForce(const LPoint3& p, FalloffType ft, PN_stdfloat r, PN_stdfloat a,
00058                 bool m);
00059   LinearDistanceForce(const LinearDistanceForce &copy);
00060   virtual ~LinearDistanceForce();
00061 
00062 public:
00063   static TypeHandle get_class_type() {
00064     return _type_handle;
00065   }
00066   static void init_type() {
00067     LinearForce::init_type();
00068     register_type(_type_handle, "LinearDistanceForce",
00069                   LinearForce::get_class_type());
00070   }
00071   virtual TypeHandle get_type() const {
00072     return get_class_type();
00073   }
00074   virtual TypeHandle force_init_type() {init_type(); return get_class_type();}
00075 
00076 private:
00077   static TypeHandle _type_handle;
00078 };
00079 
00080 #include "linearDistanceForce.I"
00081 
00082 #endif // LINEARDISTANCEFORCE_H
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