lily/axis-group-interface.cc

   1 /*
   2   axis-group-interface.cc --  implement Axis_group_interface
   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 #include "hara-kiri-group-spanner.hh"
  10 #include "axis-group-interface.hh"
  11 #include "grob.hh"
  12
  13 void
  14 Axis_group_interface::add_element (Grob*me,Grob *e)
  15 {
  16   for (SCM ax = me->get_grob_property ("axes"); ax != SCM_EOL ; ax = gh_cdr (ax))
  17     {
  18       Axis a = (Axis) gh_scm2int (gh_car (ax));
  19
  20       if (!e->parent_l (a))
  21         e->set_parent (me, a);
  22     }
  23
  24   Pointer_group_interface::add_element (me, "elements", e);
  25   me->add_dependency (e);
  26 }
  27
  28 bool
  29 Axis_group_interface::axis_b (Grob*me,Axis a)
  30 {
  31   /*
  32     urg. FIXME, check for Hara_kiri_group_spanner shouldn't be necessary?
  33
  34
  35    */
  36   return me->has_extent_callback_b (group_extent_callback_proc, a) ||
  37  (me->has_extent_callback_b (Hara_kiri_group_spanner::y_extent_proc, a));
  38 }
  39
  40 Interval
  41 Axis_group_interface::relative_group_extent (Axis a, Grob *common, SCM elts)
  42 {
  43   Interval r;
  44   for (SCM s = elts; gh_pair_p (s); s = gh_cdr (s))
  45     {
  46       Grob * se = unsmob_grob (gh_car (s));
  47       Interval dims = se->extent (common, a);
  48       if (!dims.empty_b ())
  49         r.unite (dims);
  50     }
  51   return r;
  52 }
  53
  54 MAKE_SCHEME_CALLBACK (Axis_group_interface,group_extent_callback,2);
  55 SCM
  56 Axis_group_interface::group_extent_callback (SCM element_smob, SCM scm_axis)
  57 {
  58   Grob *me = unsmob_grob (element_smob);
  59   Axis a = (Axis) gh_scm2int (scm_axis);
  60
  61   Grob * common = (Grob*) me;
  62
  63   for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s); s = gh_cdr (s))
  64     {
  65       Grob * se = unsmob_grob (gh_car (s));
  66       common = se->common_refpoint (common, a);
  67     }
  68
  69   Real my_coord = me->relative_coordinate (common, a);
  70   Interval r (relative_group_extent (a, common, me->get_grob_property ("elements")));
  71
  72   return ly_interval2scm (r - my_coord);
  73 }
  74
  75 void
  76 Axis_group_interface::set_axes (Grob*me,Axis a1, Axis a2)
  77 {
  78   // set_interface () ?
  79   SCM sa1= gh_int2scm (a1);
  80   SCM sa2 = gh_int2scm (a2);
  81
  82   SCM axes = me->get_grob_property ("axes");
  83
  84   if (!gh_pair_p (axes)
  85       || scm_memq (sa1, axes) == SCM_BOOL_F
  86       || scm_memq (sa2, axes) == SCM_BOOL_F)
  87     {
  88       SCM ax = gh_cons (sa1, SCM_EOL);
  89       if (a1 != a2)
  90         ax= gh_cons (sa2, ax);
  91       me->set_grob_property ("axes", ax);
  92     }
  93
  94   if (a1 != X_AXIS && a2 != X_AXIS)
  95     me->set_extent_callback (SCM_EOL, X_AXIS);
  96   if (a1 != Y_AXIS && a2 != Y_AXIS)
  97     me->set_extent_callback (SCM_EOL, Y_AXIS);
  98
  99   /*
 100     why so convoluted ? (fixme/documentme?)
 101    */
 102   if (me->has_extent_callback_b (Grob::molecule_extent_proc, a1))
 103     me->set_extent_callback (Axis_group_interface::group_extent_callback_proc,a1);
 104   if (me->has_extent_callback_b (Grob::molecule_extent_proc, a2))
 105     me->set_extent_callback (Axis_group_interface::group_extent_callback_proc,a2);
 106 }
 107
 108 Link_array<Grob>
 109 Axis_group_interface::get_children (Grob*me)
 110 {
 111   Link_array<Grob> childs;
 112   childs.push (me) ;
 113
 114   if (!has_interface (me))
 115     return childs;
 116
 117   for (SCM ep = me->get_grob_property ("elements"); gh_pair_p (ep); ep = gh_cdr (ep))
 118     {
 119       Grob* e = unsmob_grob (gh_car (ep));
 120       if (e)
 121         childs.concat (Axis_group_interface::get_children (e));
 122     }
 123
 124   return childs;
 125 }
 126
 127 bool
 128 Axis_group_interface::has_interface (Grob*me)
 129 {
 130   return me && me->has_interface (ly_symbol2scm ("axis-group-interface"));
 131 }
 132
 133 void
 134 Axis_group_interface::set_interface (Grob*me)
 135 {
 136   if (!has_interface (me))
 137     {
 138       me->set_interface (ly_symbol2scm ("axis-group-interface"));
 139     }
 140 }