2 separating-group-spanner.cc -- implement Separating_group_spanner
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "separating-group-spanner.hh"
11 #include "separation-item.hh"
12 #include "paper-column.hh"
13 #include "paper-def.hh"
14 #include "dimensions.hh"
15 #include "group-interface.hh"
18 Separating_group_spanner::find_rods (Item * r, SCM next)
20 Interval ri (Separation_item::my_width (r));
25 This is an inner loop, however, in most cases, the interesting L
26 will just be the first entry of NEXT, making it linear in most of
28 for(; gh_pair_p (next); next = ly_cdr (next))
30 Item *l = dynamic_cast<Item*> (unsmob_grob (ly_car( next)));
31 Item *lb = l->find_prebroken_piece (RIGHT);
35 Interval li (Separation_item::my_width (lb));
41 rod.item_l_drul_[LEFT] = lb;
42 rod.item_l_drul_[RIGHT] = r;
44 rod.distance_f_ = li[RIGHT] - ri[LEFT];
51 Interval li (Separation_item::my_width (l));
56 rod.item_l_drul_[LEFT] =l;
57 rod.item_l_drul_[RIGHT]=r;
59 rod.distance_f_ = li[RIGHT] - ri[LEFT];
68 this grob doesn't cause a constraint. We look further until we
69 find one that does. */
74 MAKE_SCHEME_CALLBACK (Separating_group_spanner,set_spacing_rods_and_seqs,1);
76 Separating_group_spanner::set_spacing_rods_and_seqs (SCM smob)
78 set_spacing_rods (smob);
80 return SCM_UNSPECIFIED;
83 MAKE_SCHEME_CALLBACK (Separating_group_spanner,set_spacing_rods,1);
85 Separating_group_spanner::set_spacing_rods (SCM smob)
87 Grob*me = unsmob_grob (smob);
89 for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s) && gh_pair_p (ly_cdr (s)); s = ly_cdr (s))
92 Order of elements is reversed!
95 Item *r = unsmob_item (elt);
101 = dynamic_cast<Item*> (r->find_prebroken_piece (LEFT));
103 find_rods (r, ly_cdr (s));
105 find_rods (rb, ly_cdr (s));
113 We've done our job, so we get lost.
115 for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s); s = ly_cdr (s))
117 Item * it =dynamic_cast<Item*> (unsmob_grob (ly_car (s)));
118 if (it && it->broken_b ())
120 it->find_prebroken_piece (LEFT) ->suicide ();
121 it->find_prebroken_piece (RIGHT)->suicide ();
127 return SCM_UNSPECIFIED ;
131 Separating_group_spanner::add_spacing_unit (Grob* me ,Item*i)
133 Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), i);
134 me->add_dependency (i);
139 Separating_group_spanner::has_interface (Grob*)
146 ADD_INTERFACE (Separating_group_spanner,"separation-spanner-interface",
147 "Spanner that containing @code{separation-item-interface} grobs to calculate rods",