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--2003 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 = ly_cdr (ax))
  17     {
  18       Axis a = (Axis) gh_scm2int (ly_car (ax));
  19
  20       if (!e->get_parent (a))
  21         e->set_parent (me, a);
  22     }
  23
  24   Pointer_group_interface::add_grob (me, ly_symbol2scm ("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 = ly_cdr (s))
  45     {
  46       Grob * se = unsmob_grob (ly_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   SCM elts = me->get_grob_property ("elements");
  62   Grob * common = common_refpoint_of_list (elts, me, a);
  63
  64   Real my_coord = me->relative_coordinate (common, a);
  65   Interval r (relative_group_extent (a, common,elts));
  66
  67   return ly_interval2scm (r - my_coord);
  68 }
  69
  70 void
  71 Axis_group_interface::set_axes (Grob*me,Axis a1, Axis a2)
  72 {
  73   SCM sa1= scm_int2num (a1);
  74   SCM sa2 = scm_int2num (a2);
  75
  76   SCM axes = me->get_grob_property ("axes");
  77
  78   if (!gh_pair_p (axes)
  79       || scm_memq (sa1, axes) == SCM_BOOL_F
  80       || scm_memq (sa2, axes) == SCM_BOOL_F)
  81     {
  82       SCM ax = gh_cons (sa1, SCM_EOL);
  83       if (a1 != a2)
  84         ax= gh_cons (sa2, ax);
  85       me->set_grob_property ("axes", ax);
  86     }
  87
  88   if (a1 != X_AXIS && a2 != X_AXIS)
  89     me->set_extent (SCM_EOL, X_AXIS);
  90   if (a1 != Y_AXIS && a2 != Y_AXIS)
  91     me->set_extent (SCM_EOL, Y_AXIS);
  92
  93   /*
  94     why so convoluted ? (fixme/documentme?)
  95    */
  96   if (me->has_extent_callback_b (Grob::molecule_extent_proc, a1))
  97     me->set_extent (Axis_group_interface::group_extent_callback_proc,a1);
  98   if (me->has_extent_callback_b (Grob::molecule_extent_proc, a2))
  99     me->set_extent (Axis_group_interface::group_extent_callback_proc,a2);
 100 }
 101
 102 Link_array<Grob>
 103 Axis_group_interface::get_children (Grob*me)
 104 {
 105   Link_array<Grob> childs;
 106   childs.push (me) ;
 107
 108   if (!has_interface (me))
 109     return childs;
 110
 111   for (SCM ep = me->get_grob_property ("elements"); gh_pair_p (ep); ep = ly_cdr (ep))
 112     {
 113       Grob* e = unsmob_grob (ly_car (ep));
 114       if (e)
 115         childs.concat (Axis_group_interface::get_children (e));
 116     }
 117
 118   return childs;
 119 }
 120
 121
 122
 123 ADD_INTERFACE (Axis_group_interface, "axis-group-interface",
 124   "a group of coupled grobs",
 125   "axes");