2 rest-collision.cc -- implement Rest_collision
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 #include <math.h> // ceil.
12 #include "rest-collision.hh"
13 #include "note-column.hh"
15 #include "note-head.hh"
16 #include "collision.hh"
17 #include "paper-def.hh"
19 #include "group-interface.hh"
20 #include "staff-symbol-referencer.hh"
21 #include "duration.hh"
24 Rest_collision::add_column (Note_column *nc_l)
26 add_dependency (nc_l);
27 Pointer_group_interface gi (this);
33 gi.add_element (nc_l);
37 to_duration (int type, int dots)
46 rhythmic_head2mom (Rhythmic_head* r)
48 return to_duration (r->balltype_i (), r->dot_count ()).length_mom ();
55 col2rhythmic_head (Note_column* c)
57 SCM s = c->get_elt_pointer ("rests");
58 assert (gh_pair_p (s));
59 Score_element* e = unsmob_element (gh_car (s));
60 return dynamic_cast<Rhythmic_head*> (e);
63 GLUE_SCORE_ELEMENT(Rest_collision,before_line_breaking);
65 Rest_collision::member_before_line_breaking ()
67 Link_array<Note_column> rest_l_arr =
68 Pointer_group_interface__extract_elements (this, (Note_column*) 0, "rests");
69 Link_array<Note_column> ncol_l_arr =
70 Pointer_group_interface__extract_elements (this, (Note_column*) 0, "notes");
74 handle rest-rest and rest-note collisions
77 * decide not to print rest if too crowded?
79 * ignore rests under beams.
82 // no rests to collide
83 if (!rest_l_arr.size())
86 // no partners to collide with
87 if (rest_l_arr.size() + ncol_l_arr.size () < 2)
90 // meisjes met meisjes
91 if (!ncol_l_arr.size())
93 Moment m = rhythmic_head2mom (col2rhythmic_head (rest_l_arr[0]));
95 for (; i < rest_l_arr.size (); i++)
97 Moment me = rhythmic_head2mom (col2rhythmic_head (rest_l_arr[i]));
103 If all durations are the same, we'll check if there are more
104 rests than maximum-rest-count.
105 Otherwise (different durations), we'll try to display them all
106 (urg: all 3 of them, currently).
109 SCM s = get_elt_property ("maximum-rest-count");
110 if (i == rest_l_arr.size ()
111 && gh_number_p (s) && gh_scm2int (s) < rest_l_arr.size ())
113 display_count = gh_scm2int (s);
114 for (; i > display_count; i--)
115 col2rhythmic_head (rest_l_arr[i-1])
116 ->set_elt_property ("molecule-callback", SCM_BOOL_T);
119 display_count = rest_l_arr.size ();
122 UGH. Should get dims from table. Should have minimum dist.
124 int dy = display_count > 2 ? 6 : 4;
125 if (display_count > 1)
127 rest_l_arr[0]->translate_rests (dy);
128 rest_l_arr[1]->translate_rests (-dy);
131 // meisjes met jongetjes
134 if (rest_l_arr.size () > 1)
136 warning (_("too many colliding rests"));
138 if (ncol_l_arr.size () > 1)
140 warning (_("too many notes for rest collision"));
142 Note_column * rcol = rest_l_arr[0];
144 // try to be opposite of noteheads.
145 Direction dir = - ncol_l_arr[0]->dir();
147 Interval restdim = rcol->rest_dim ();
148 if (restdim.empty_b ())
149 return SCM_UNDEFINED;
152 Real staff_space = paper_l()->get_var ("interline");
155 staff_space = rcol->rest_l_arr[0]->staff_space ();
157 Real half_staff_space_f = staff_space/2;
158 Real minimum_dist = paper_l ()->get_var ("restcollision_minimum_dist")
159 * half_staff_space_f;
162 assumption: ref points are the same.
165 for (int i = 0; i < ncol_l_arr.size(); i++)
167 notedim.unite (ncol_l_arr[i]->extent (Y_AXIS));
170 Interval inter (notedim);
171 inter.intersect (restdim);
174 minimum_dist + dir * (notedim[dir] - restdim[-dir]) >? 0;
178 //int stafflines = 5; // rcol->rest_l_arr[0]->line_count;
179 int stafflines = Staff_symbol_referencer_interface (this).line_count ();
181 stafflines = stafflines != 0 ? stafflines : 5;
183 // move discretely by half spaces.
184 int discrete_dist = int (ceil (dist / (0.5 *staff_space)));
186 // move by whole spaces inside the staff.
187 if (discrete_dist < stafflines+1)
188 discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
190 rcol->translate_rests (dir * discrete_dist);
192 return SCM_UNDEFINED;
196 Rest_collision::Rest_collision(SCM s)
199 set_elt_pointer ("rests", SCM_EOL);
200 set_elt_pointer ("notes", SCM_EOL);
201 set_extent_callback (0, X_AXIS);
202 set_extent_callback (0, Y_AXIS);