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 ();
52 col2rhythmic_head (Note_column* c)
54 SCM s = c->get_elt_pointer ("rests");
55 assert (gh_pair_p (s));
56 Score_element* e = unsmob_element (gh_car (s));
57 return dynamic_cast<Rhythmic_head*> (e);
61 Rest_collision::before_line_breaking ()
63 Link_array<Note_column> rest_l_arr =
64 Pointer_group_interface__extract_elements (this, (Note_column*) 0, "rests");
65 Link_array<Note_column> ncol_l_arr =
66 Pointer_group_interface__extract_elements (this, (Note_column*) 0, "notes");
70 handle rest-rest and rest-note collisions
73 * decide not to print rest if too crowded?
75 * ignore rests under beams.
78 // no rests to collide
79 if (!rest_l_arr.size())
82 // no partners to collide with
83 if (rest_l_arr.size() + ncol_l_arr.size () < 2)
86 // meisjes met meisjes
87 if (!ncol_l_arr.size())
89 Moment m = rhythmic_head2mom (col2rhythmic_head (rest_l_arr[0]));
91 for (; i < rest_l_arr.size (); i++)
93 Moment me = rhythmic_head2mom (col2rhythmic_head (rest_l_arr[i]));
99 If all durations are the same, we'll check if there are more
100 rests than maximum-rest-count.
101 Otherwise (different durations), we'll try to display them all
102 (urg: all 3 of them, currently).
105 SCM s = get_elt_property ("maximum-rest-count");
106 if (i == rest_l_arr.size ()
107 && gh_number_p (s) && gh_scm2int (s) < rest_l_arr.size ())
109 display_count = gh_scm2int (s);
110 for (; i > display_count; i--)
111 col2rhythmic_head (rest_l_arr[i-1])
112 ->set_elt_property ("transparent", SCM_BOOL_T);
115 display_count = rest_l_arr.size ();
118 UGH. Should get dims from table. Should have minimum dist.
120 int dy = display_count > 2 ? 6 : 4;
121 if (display_count > 1)
123 rest_l_arr[0]->translate_rests (dy);
124 rest_l_arr[1]->translate_rests (-dy);
127 // meisjes met jongetjes
130 if (rest_l_arr.size () > 1)
132 warning (_("too many colliding rests"));
134 if (ncol_l_arr.size () > 1)
136 warning (_("too many notes for rest collision"));
138 Note_column * rcol = rest_l_arr[0];
140 // try to be opposite of noteheads.
141 Direction dir = - ncol_l_arr[0]->dir();
143 Interval restdim = rcol->rest_dim ();
144 if (restdim.empty_b ())
148 Real staff_space = paper_l()->get_var ("interline");
151 staff_space = rcol->rest_l_arr[0]->staff_space ();
153 Real half_staff_space_f = staff_space/2;
154 Real minimum_dist = paper_l ()->get_var ("restcollision_minimum_dist")
155 * half_staff_space_f;
158 assumption: ref points are the same.
161 for (int i = 0; i < ncol_l_arr.size(); i++)
163 notedim.unite (ncol_l_arr[i]->extent (Y_AXIS));
166 Interval inter (notedim);
167 inter.intersect (restdim);
170 minimum_dist + dir * (notedim[dir] - restdim[-dir]) >? 0;
174 //int stafflines = 5; // rcol->rest_l_arr[0]->line_count;
175 int stafflines = Staff_symbol_referencer_interface (this).line_count ();
177 stafflines = stafflines != 0 ? stafflines : 5;
179 // move discretely by half spaces.
180 int discrete_dist = int (ceil (dist / (0.5 *staff_space)));
182 // move by whole spaces inside the staff.
183 if (discrete_dist < stafflines+1)
184 discrete_dist = int (ceil (discrete_dist / 2.0)* 2.0);
186 rcol->translate_rests (dir * discrete_dist);
191 Rest_collision::Rest_collision()
193 set_elt_pointer ("rests", SCM_EOL);
194 set_elt_pointer ("notes", SCM_EOL);
195 set_elt_property ("transparent", SCM_BOOL_T);
196 set_extent_callback (0, X_AXIS);
197 set_extent_callback (0, Y_AXIS);