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)
22 This is an inner loop, however, in most cases, the interesting L
23 will just be the first entry of NEXT, making it linear in most of
25 for(; gh_pair_p (next); next = ly_cdr (next))
27 Item *l = dynamic_cast<Item*> (unsmob_grob (ly_car( next)));
28 Item *lb = l->find_prebroken_piece (RIGHT);
32 Interval li (Separation_item::width (lb));
33 Interval ri (Separation_item::conditional_width (r, lb));
34 if (!li.empty_b () && !ri.empty_b())
38 rod.item_l_drul_[LEFT] = lb;
39 rod.item_l_drul_[RIGHT] = r;
41 rod.distance_f_ = li[RIGHT] - ri[LEFT];
48 Interval li (Separation_item::width (l));
49 Interval ri (Separation_item::conditional_width (r, l));
50 if (!li.empty_b () && !ri.empty_b())
54 rod.item_l_drul_[LEFT] =l;
55 rod.item_l_drul_[RIGHT]=r;
57 rod.distance_f_ = li[RIGHT] - ri[LEFT];
66 this grob doesn't cause a constraint. We look further until we
67 find one that does. */
72 MAKE_SCHEME_CALLBACK (Separating_group_spanner,set_spacing_rods_and_seqs,1);
74 Separating_group_spanner::set_spacing_rods_and_seqs (SCM smob)
76 set_spacing_rods (smob);
78 return SCM_UNSPECIFIED;
81 MAKE_SCHEME_CALLBACK (Separating_group_spanner,set_spacing_rods,1);
83 Separating_group_spanner::set_spacing_rods (SCM smob)
85 Grob*me = unsmob_grob (smob);
87 for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s) && gh_pair_p (ly_cdr (s)); s = ly_cdr (s))
90 Order of elements is reversed!
93 Item *r = unsmob_item (elt);
99 = dynamic_cast<Item*> (r->find_prebroken_piece (LEFT));
101 find_rods (r, ly_cdr (s));
103 find_rods (rb, ly_cdr (s));
106 return SCM_UNSPECIFIED ;
110 Separating_group_spanner::add_spacing_unit (Grob* me ,Item*i)
112 Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), i);
113 me->add_dependency (i);
120 ADD_INTERFACE (Separating_group_spanner,"separation-spanner-interface",
121 "Spanner that containing @code{separation-item-interface} grobs to calculate rods",