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--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "axis-group-interface.hh"
  10
  11 #include "pointer-group-interface.hh"
  12 #include "grob.hh"
  13 #include "hara-kiri-group-spanner.hh"
  14 #include "warn.hh"
  15
  16 void
  17 Axis_group_interface::add_element (Grob *me, Grob *e)
  18 {
  19   SCM axes = me->get_property ("axes");
  20   if (!scm_is_pair (axes))
  21     programming_error ("axes should be nonempty");
  22
  23   for (SCM ax = axes; ax != SCM_EOL; ax = scm_cdr (ax))
  24     {
  25       Axis a = (Axis) scm_to_int (scm_car (ax));
  26
  27       if (!e->get_parent (a))
  28         e->set_parent (me, a);
  29
  30       e->internal_set_object ((a == X_AXIS)
  31                               ? ly_symbol2scm ("axis-group-parent-X")
  32                               : ly_symbol2scm ("axis-group-parent-Y"),
  33                               me->self_scm ());
  34     }
  35
  36   Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), e);
  37 }
  38
  39 bool
  40 Axis_group_interface::has_axis (Grob *me, Axis a)
  41 {
  42   /*
  43     urg. FIXME, check for Hara_kiri_group_spanner shouldn't be necessary?
  44   */
  45   return me->has_extent_callback (group_extent_callback_proc, a)
  46     || (me->has_extent_callback (Hara_kiri_group_spanner::y_extent_proc, a));
  47 }
  48
  49 Interval
  50 Axis_group_interface::relative_group_extent (Link_array<Grob> const &elts,
  51                                              Grob *common, Axis a)
  52 {
  53   Interval r;
  54   for (int i = 0; i < elts.size (); i++)
  55     {
  56       Grob *se = elts[i];
  57       Interval dims = se->extent (common, a);
  58       if (!dims.is_empty ())
  59         r.unite (dims);
  60     }
  61   return r;
  62 }
  63
  64
  65 MAKE_SCHEME_CALLBACK (Axis_group_interface, group_extent_callback, 2);
  66 SCM
  67 Axis_group_interface::group_extent_callback (SCM element_smob, SCM scm_axis)
  68 {
  69   Grob *me = unsmob_grob (element_smob);
  70   Axis a = (Axis) scm_to_int (scm_axis);
  71
  72   extract_grob_set (me, "elements", elts);
  73   Grob *common = common_refpoint_of_array (elts, me, a);
  74
  75   Real my_coord = me->relative_coordinate (common, a);
  76   Interval r (relative_group_extent (elts, common, a));
  77
  78   return ly_interval2scm (r - my_coord);
  79 }
  80
  81 void
  82 Axis_group_interface::set_axes (Grob *me, Axis a1, Axis a2)
  83 {
  84   SCM sa1 = scm_from_int (a1);
  85   SCM sa2 = scm_from_int (a2);
  86
  87   SCM axes = me->get_property ("axes");
  88
  89   if (!scm_is_pair (axes)
  90       || scm_c_memq (sa1, axes) == SCM_BOOL_F
  91       || scm_c_memq (sa2, axes) == SCM_BOOL_F)
  92     {
  93       SCM ax = scm_cons (sa1, SCM_EOL);
  94       if (a1 != a2)
  95         ax = scm_cons (sa2, ax);
  96       me->set_property ("axes", ax);
  97     }
  98
  99   if (a1 != X_AXIS && a2 != X_AXIS)
 100     me->set_extent (SCM_EOL, X_AXIS);
 101   if (a1 != Y_AXIS && a2 != Y_AXIS)
 102     me->set_extent (SCM_EOL, Y_AXIS);
 103
 104   /*
 105     why so convoluted ? (fixme/documentme?)
 106   */
 107   if (me->has_extent_callback (Grob::stencil_extent_proc, a1))
 108     me->set_extent_callback (Axis_group_interface::group_extent_callback_proc, a1);
 109   if (me->has_extent_callback (Grob::stencil_extent_proc, a2))
 110     me->set_extent_callback (Axis_group_interface::group_extent_callback_proc, a2);
 111 }
 112
 113 void
 114 Axis_group_interface::get_children (Grob *me, Link_array<Grob> *found)
 115 {
 116   found->push (me);
 117
 118   if (!has_interface (me))
 119     return;
 120
 121   extract_grob_set (me, "elements", elements);
 122   for (int i = 0; i < elements.size (); i++)
 123     {
 124       Grob *e = elements[i];
 125       Axis_group_interface::get_children (e, found);
 126     }
 127 }
 128
 129 ADD_INTERFACE (Axis_group_interface, "axis-group-interface",
 130                "An object that groups other layout objects.",
 131                "axes elements");