2 separating-group-spanner.cc -- implement Separating_group_spanner
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2001 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,1);
76 Separating_group_spanner::set_spacing_rods (SCM smob)
78 Grob*me = unsmob_grob (smob);
80 for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s) && gh_pair_p (ly_cdr (s)); s = ly_cdr (s))
83 Order of elements is reversed!
86 Item *r = dynamic_cast<Item*> (unsmob_grob (elt));
92 = dynamic_cast<Item*> (r->find_prebroken_piece (LEFT));
94 find_rods (r, ly_cdr (s));
96 find_rods (rb, ly_cdr (s));
98 find_musical_sequences (me);
104 We've done our job, so we get lost.
106 for (SCM s = me->get_grob_property ("elements"); gh_pair_p (s); s = ly_cdr (s))
108 Item * it =dynamic_cast<Item*> (unsmob_grob (ly_car (s)));
109 if (it && it->broken_b ())
111 it->find_prebroken_piece (LEFT) ->suicide ();
112 it->find_prebroken_piece (RIGHT)->suicide ();
118 return SCM_UNSPECIFIED ;
122 Separating_group_spanner::add_spacing_unit (Grob* me ,Item*i)
124 Pointer_group_interface::add_element (me, "elements",i);
125 me->add_dependency (i);
130 Separating_group_spanner::find_musical_sequences (Grob *me)
134 for (SCM s = me->get_grob_property ("elements");
135 gh_pair_p (s); s = ly_cdr (s))
137 Item *it = dynamic_cast<Item*> (unsmob_grob (ly_car (s)));
140 Item *lcol = last->column_l ();
141 Item *col = it->column_l ();
143 int lrank = Paper_column::rank_i (lcol);
144 int rank = Paper_column ::rank_i (col);
146 bool mus = Paper_column::musical_b (col);
147 bool lmus = Paper_column::musical_b (lcol);
149 if ((lrank - rank == 2) && lmus && mus)
151 SCM seq = col->get_grob_property ("spacing-sequence");
152 col->set_grob_property ("spacing-sequence",
153 gh_cons (gh_cons (it->self_scm (), last->self_scm ()), seq));
156 if (llast && !Paper_column::breakable_b (last))
158 Item *llcol = llast->column_l ();
159 int llrank = Paper_column::rank_i (llcol);
160 bool llmus= Paper_column::musical_b (llcol);
161 if (llrank - lrank == 1
163 && llmus && !lmus && mus)
165 SCM seq = col->get_grob_property ("spacing-sequence");
166 col->set_grob_property ("spacing-sequence",
167 gh_cons (gh_cons (it->self_scm (), last->self_scm ()), seq));
171 SCM between = lcol->get_grob_property ("between-cols");
173 if (!gh_pair_p (between))
175 between = gh_cons (it->self_scm (), llast->self_scm ());
176 lcol ->set_grob_property ("between-cols", between);
180 = dynamic_cast<Item*> (unsmob_grob (ly_car (between)));
181 if(Paper_column::rank_i (left->column_l ()) < rank)
182 gh_set_car_x (between, col->self_scm());
185 = dynamic_cast<Item*> (unsmob_grob (ly_cdr (between)));
186 if (Paper_column::rank_i (right->column_l ()) > llrank )
187 gh_set_cdr_x (between, llcol->self_scm ());
199 Separating_group_spanner::set_loose_rods ()
201 // loose columns should also generate minimum distances.
208 Separating_group_spanner::set_interface (Grob*)
213 Separating_group_spanner::has_interface (Grob*)