2 rest-collision.cc -- implement Rest_collision
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include <math.h> // ceil.
12 #include "rest-collision.hh"
13 #include "note-column.hh"
15 #include "rhythmic-head.hh"
16 #include "paper-def.hh"
18 #include "group-interface.hh"
19 #include "staff-symbol-referencer.hh"
20 #include "duration.hh"
22 MAKE_SCHEME_CALLBACK (Rest_collision,force_shift_callback,2);
24 Rest_collision::force_shift_callback (SCM element_smob, SCM axis)
26 Grob *them = unsmob_grob (element_smob);
27 Axis a = (Axis) gh_scm2int (axis);
30 Grob * rc = unsmob_grob (them->get_grob_property ("rest-collision"));
35 Done: destruct pointers, so we do the shift only once.
37 TODO: use rest-collision-done
39 SCM elts = rc->get_grob_property ("elements");
40 rc->set_grob_property ("elements", SCM_EOL);
45 return gh_double2scm (0.0);
49 Rest_collision::add_column (Grob*me,Grob *p)
51 me->add_dependency (p);
52 Pointer_group_interface::add_grob (me, ly_symbol2scm ("elements"), p);
55 only add callback for the rests, since we don't move anything else.
59 p->add_offset_callback (Rest_collision::force_shift_callback_proc, Y_AXIS);
60 p->set_grob_property ("rest-collision", me->self_scm ());
65 Combination of dot-count and duration-log.
68 head_characteristic (Grob * col)
70 Grob * s = unsmob_grob (col->get_grob_property ("rest"));
75 return gh_cons (s->get_grob_property ("duration-log"),
76 gh_int2scm (Rhythmic_head::dot_count (s)));
80 TODO: fixme, fucks up if called twice on the same set of rests.
82 TODO: look at horizontal-shift to determine ordering between rests
83 for more than two voices.
86 Rest_collision::do_shift (Grob *me, SCM elts)
89 ugh. -> score elt type
91 Link_array<Grob> rests;
92 Link_array<Grob> notes;
94 for (SCM s = elts; gh_pair_p (s); s = ly_cdr (s))
97 Grob * e = unsmob_grob (ly_car (s));
104 commony= commony->common_refpoint (e, Y_AXIS);
106 if (unsmob_grob (e->get_grob_property ("rest")))
114 handle rest-rest and rest-note collisions
117 * decide not to print rest if too crowded?
119 * ignore rests under beams.
122 // no rests to collide
124 return SCM_UNSPECIFIED;
126 // no partners to collide with
127 if (rests.size () + notes.size () < 2)
128 return SCM_UNSPECIFIED;
130 // meisjes met meisjes
133 SCM characteristic = head_characteristic (rests[0]);
135 for (; i < rests.size (); i++)
137 if (!gh_equal_p (head_characteristic (rests[i]), characteristic))
142 If all durations are the same, we'll check if there are more
143 rests than maximum-rest-count.
144 Otherwise (different durations), we'll try to display them all
145 (urg: all 3 of them, currently).
148 SCM s = me->get_grob_property ("maximum-rest-count");
149 if (i == rests.size ()
150 && gh_number_p (s) && gh_scm2int (s) < rests.size ())
152 display_count = gh_scm2int (s);
153 for (; i > display_count; i--)
155 Grob* r = unsmob_grob (rests[i-1]->get_grob_property ("rest"));
158 rests[i-1]->suicide ();
162 display_count = rests.size ();
165 Ugh. Should have minimum dist.
167 Ugh. What do we do if we have three different rests?
170 int dy = display_count > 2 ? 6 : 4; // FIXME Should get dims from table.
171 if (display_count > 1)
173 Direction d0 = Note_column::dir (rests[0]);
174 Direction d1 = Note_column::dir (rests[1]);
186 Note_column::translate_rests (rests[0],d0 *dy);
187 Note_column::translate_rests (rests[1], d1 *dy);
190 // meisjes met jongetjes
193 if (rests.size () > 1)
195 warning (_ ("too many colliding rests"));
197 Grob * rcol = rests[0];
198 Direction dir = Note_column::dir (rests[0]);
200 Grob * r = unsmob_grob (rcol->get_grob_property ("rest"));
201 Interval restdim = r->extent (r, Y_AXIS); // ??
203 if (restdim.empty_b ())
204 return SCM_UNSPECIFIED;
207 Real staff_space = Staff_symbol_referencer::staff_space (rcol);
209 Real minimum_dist = gh_scm2double (me->get_grob_property ("minimum-distance")) * staff_space;
213 for (int i = 0; i < notes.size (); i++)
214 common = common->common_refpoint (notes[i], Y_AXIS);
217 for (int i = 0; i < notes.size (); i++)
219 notedim.unite (notes[i]->extent (common, Y_AXIS));
222 Interval inter (notedim);
223 inter.intersect (restdim);
226 minimum_dist + dir * (notedim[dir] - restdim[-dir]) >? 0;
228 int stafflines = Staff_symbol_referencer::line_count (me);
231 programming_error ("No staff line count ? ");
235 // move discretely by half spaces.
236 int discrete_dist = int (ceil (dist / (0.5 *staff_space)));
238 // move by whole spaces inside the staff.
239 if (discrete_dist < stafflines+1)
240 discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
242 Note_column::translate_rests (rcol,dir * discrete_dist);
244 return SCM_UNSPECIFIED;
248 ADD_INTERFACE (Rest_collision,"rest-collision-interface",
249 "Move around ordinary rests (not multi-measure-rests) to avoid
251 "maximum-rest-count minimum-distance elements");