lily/spaceable-element.cc

   1 /*
   2   spaceable-element.cc --  implement Spaceable_element
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "spaceable-element.hh"
  11 #include "score-element.hh"
  12 #include "warn.hh"
  13
  14 SCM
  15 Spaceable_element::get_minimum_distances ( Score_element*me)
  16 {
  17   return me->get_elt_property ("minimum-distances");
  18 }
  19
  20 /*todo: merge code of spring & rod?
  21  */
  22 void
  23 Spaceable_element::add_rod (Score_element *me , Score_element * 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_elt_property ("minimum-distances", mins);
  40 }
  41
  42 void
  43 Spaceable_element::add_spring (Score_element*me, Score_element * p, Real d, Real strength)
  44 {
  45   SCM mins = get_ideal_distances (me);
  46   SCM newdist= gh_double2scm (d);
  47   for (SCM s = mins; gh_pair_p (s); s = gh_cdr (s))
  48     {
  49       SCM dist = gh_car (s);
  50       if (gh_car (dist) == p->self_scm ())
  51         {
  52           programming_error("already have that spring");
  53           return ;
  54         }
  55     }
  56   SCM newstrength= gh_double2scm (strength);
  57
  58   mins = gh_cons (gh_cons (p->self_scm (), gh_cons (newdist, newstrength)), mins);
  59   me->set_elt_property ("ideal-distances", mins);
  60 }
  61
  62 SCM
  63 Spaceable_element::get_ideal_distances (Score_element*me)
  64 {
  65   return me->get_elt_property ("ideal-distances");
  66 }
  67
  68
  69 void
  70 Spaceable_element::remove_interface (Score_element*me)
  71 {
  72   me->remove_elt_property ("minimum-distances");
  73   me->remove_elt_property ("ideal-distances");
  74   me->remove_elt_property ("dir-list");
  75 }
  76
  77
  78 void
  79 Spaceable_element::set_interface (Score_element*me)
  80 {
  81   me->set_elt_property ("minimum-distances", SCM_EOL);
  82   me->set_elt_property ("ideal-distances", SCM_EOL);
  83   me->set_elt_property ("dir-list",SCM_EOL) ;
  84 }