lily/include/spring.hh

   1 /*
   2   spring.hh -- declare Spring
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #ifndef SPRING_HH
  10 #define SPRING_HH
  11
  12 #include "lily-proto.hh"
  13 #include "smobs.hh"
  14
  15 class Spring
  16 {
  17   Real distance_;
  18   Real min_distance_;
  19
  20   Real inverse_stretch_strength_;
  21   Real inverse_compress_strength_;
  22
  23   Real blocking_force_;
  24
  25   void update_blocking_force ();
  26
  27   DECLARE_SIMPLE_SMOBS (Spring);
  28 public:
  29   Spring ();
  30   Spring (Real distance, Real min_distance);
  31
  32   Real distance () const {return distance_;}
  33   Real min_distance () const {return min_distance_;}
  34   Real inverse_stretch_strength () const {return inverse_stretch_strength_;}
  35   Real inverse_compress_strength () const {return inverse_compress_strength_;}
  36   Real blocking_force () const {return blocking_force_;}
  37
  38   Real length (Real f) const;
  39
  40   void set_distance (Real);
  41   void set_min_distance (Real);
  42   void set_inverse_stretch_strength (Real);
  43   void set_inverse_compress_strength (Real);
  44   void set_blocking_force (Real);
  45   void set_default_strength ();
  46
  47   void operator*= (Real);
  48   bool operator> (Spring const&) const;
  49 };
  50 DECLARE_UNSMOB (Spring, spring);
  51
  52 Spring merge_springs (vector<Spring> const &springs);
  53
  54 #endif /* SPRING_HH */
  55