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 void
  21 Spaceable_element::add_rod (Score_element *me , Score_element * p, Real d)
  22 {
  23   SCM mins = get_minimum_distances (me);
  24   SCM newdist=                 gh_double2scm (d);
  25   for (; gh_pair_p (mins); mins = gh_cdr (mins))
  26     {
  27       SCM dist = gh_car (mins);
  28       if (gh_car (dist) == p->self_scm_)
  29         {
  30           gh_set_cdr_x (dist, scm_max (gh_cdr (dist),
  31                                        newdist));
  32           return ;
  33         }
  34     }
  35
  36   mins = gh_cons (gh_cons (p->self_scm_, newdist), mins);
  37   me->set_elt_property ("minimum-distances", mins);
  38 }
  39
  40 SCM
  41 Spaceable_element::get_ideal_distances (Score_element*me)
  42 {
  43   return me->get_elt_property ("ideal-distances");
  44 }
  45
  46 void
  47 Spaceable_element::add_spring (Score_element*me, Score_element * p, Real d, Real s)
  48 {
  49   SCM mins = get_ideal_distances (me);
  50   SCM newdist= gh_double2scm (d);
  51   for (; gh_pair_p (mins); mins = gh_cdr (mins))
  52     {
  53       SCM dist = gh_car (mins);
  54       if (gh_car (dist) == p->self_scm_)
  55         {
  56           programming_error("already have that spring");
  57           /*      gh_set_car_x (gh_cdr (dist), scm_max (gh_cadr (dist),
  58                   newdist));*/
  59           return ;
  60         }
  61     }
  62   SCM newstrength= gh_double2scm (s);
  63
  64   mins = gh_cons (gh_cons (p->self_scm_, gh_cons (newdist, newstrength)), mins);
  65   me->set_elt_property ("ideal-distances", mins);
  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 }