lily/spaceable-grob.cc

   1 /*
   2   spaceable-grob.cc --  implement Spaceable_grob
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "spaceable-grob.hh"
  11 #include "grob.hh"
  12 #include "warn.hh"
  13
  14 SCM
  15 Spaceable_grob::get_minimum_distances (Grob*me)
  16 {
  17   return me->get_grob_property ("minimum-distances");
  18 }
  19
  20 /*todo: merge code of spring & rod?
  21  */
  22 void
  23 Spaceable_grob::add_rod (Grob *me , Grob * p, Real d)
  24 {
  25   SCM mins = get_minimum_distances (me);
  26   SCM newdist = gh_double2scm (d);
  27   for (SCM s = mins; gh_pair_p (s); s = gh_cdr (s))
  28     {
  29       SCM dist = gh_car (s);
  30       if (gh_car (dist) == p->self_scm ())
  31         {
  32           gh_set_cdr_x (dist, scm_max (gh_cdr (dist),
  33                                        newdist));
  34           return ;
  35         }
  36     }
  37
  38   mins = gh_cons (gh_cons (p->self_scm (), newdist), mins);
  39   me->set_grob_property ("minimum-distances", mins);
  40 }
  41
  42 void
  43 Spaceable_grob::add_spring (Grob*me, Grob * p, Real d, Real strength)
  44 {
  45   SCM mins = me->get_grob_property ("ideal-distances");
  46
  47
  48   SCM newdist= gh_double2scm (d);
  49   for (SCM s = mins; gh_pair_p (s); s = gh_cdr (s))
  50     {
  51       SCM dist = gh_car (s);
  52       if (gh_car (dist) == p->self_scm ())
  53         {
  54           programming_error ("already have that spring");
  55           return ;
  56         }
  57     }
  58   SCM newstrength= gh_double2scm (strength);
  59
  60   mins = gh_cons (gh_cons (p->self_scm (), gh_cons (newdist, newstrength)), mins);
  61   me->set_grob_property ("ideal-distances", mins);
  62 }
  63
  64
  65 void
  66 Spaceable_grob::remove_interface (Grob*me)
  67 {
  68   me->remove_grob_property ("minimum-distances");
  69   me->remove_grob_property ("ideal-distances");
  70   me->remove_grob_property ("dir-list");
  71 }
  72
  73
  74 void
  75 Spaceable_grob::set_interface (Grob*me)
  76 {
  77   me->set_interface (ly_symbol2scm ("spaceable-grob-interface"));
  78 }