2 collision.cc -- implement Collision
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "collision.hh"
10 #include "note-column.hh"
11 #include "note-head.hh"
12 #include "paper-def.hh"
13 #include "axis-group-interface.hh"
16 Collision::Collision(SCM s )
19 Axis_group_interface (this).set_interface ();
20 Axis_group_interface (this).set_axes (X_AXIS, Y_AXIS);
24 Collision::add_column (Note_column* ncol_l)
26 Axis_group_interface (this).add_element (ncol_l);
27 add_dependency (ncol_l);
30 GLUE_SCORE_ELEMENT(Collision,before_line_breaking);
32 Collision::member_before_line_breaking ()
39 TODO: make callback of this.
42 Collision::do_shifts()
44 SCM autos (automatic_shift ());
45 SCM hand (forced_shift ());
46 Link_array<Score_element> done;
48 Real wid = paper_l ()->get_var ("collision_note_width");
49 for (; gh_pair_p (hand); hand =gh_cdr (hand))
51 Score_element * s = unsmob_element (gh_caar (hand));
52 Real amount = gh_scm2double (gh_cdar (hand));
54 s->translate_axis (amount *wid, X_AXIS);
57 for (; gh_pair_p (autos); autos =gh_cdr (autos))
59 Score_element * s = unsmob_element (gh_caar (autos));
60 Real amount = gh_scm2double (gh_cdar (autos));
63 s->translate_axis (amount * wid, X_AXIS);
67 /** This complicated routine moves note columns around horizontally to
68 ensure that notes don't clash.
70 This should be put into Scheme.
73 Collision::automatic_shift ()
75 Drul_array<Link_array<Note_column> > clash_groups;
76 Drul_array<Array<int> > shifts;
79 SCM s = get_elt_pointer ("elements");
80 for (; gh_pair_p (s); s = gh_cdr (s))
84 Score_element * se = unsmob_element (car);
85 if (Note_column * col = dynamic_cast<Note_column*> (se))
86 clash_groups[col->dir ()].push (col);
93 Array<int> & shift (shifts[d]);
94 Link_array<Note_column> & clashes (clash_groups[d]);
96 clashes.sort (Note_column::shift_compare);
98 for (int i=0; i < clashes.size (); i++)
101 = clashes[i]->get_elt_property ("horizontal-shift");
103 if (gh_number_p (sh))
104 shift.push (gh_scm2int (sh));
109 for (int i=1; i < shift.size (); i++)
111 if (shift[i-1] == shift[i])
113 warning (_ ("Too many clashing notecolumns. Ignoring them."));
118 while ((flip (&d))!= UP);
120 Drul_array< Array < Slice > > extents;
121 Drul_array< Array < Real > > offsets;
125 for (int i=0; i < clash_groups[d].size (); i++)
127 Slice s(clash_groups[d][i]->head_positions_interval ());
131 offsets[d].push (d * 0.5 * i);
134 while ((flip (&d))!= UP);
138 for (int i=1; i < clash_groups[d].size (); i++)
140 Slice prev =extents[d][i-1];
141 prev.intersect (extents[d][i]);
142 if (prev.length ()> 0 ||
143 (extents[-d].size () && d * (extents[d][i][-d] - extents[-d][0][d]) < 0))
144 for (int j = i; j < clash_groups[d].size (); j++)
145 offsets[d][j] += d * 0.5;
148 while ((flip (&d))!= UP);
151 if the up and down version are close, and can not be merged, move
152 all of them again. */
153 if (extents[UP].size () && extents[DOWN].size ())
155 Note_column *cu_l =clash_groups[UP][0];
156 Note_column *cd_l =clash_groups[DOWN][0];
162 Note_head * nu_l= cu_l->first_head();
163 Note_head * nd_l = cd_l->first_head();
165 int downpos = cd_l->head_positions_interval ()[BIGGER];
166 int uppos = cu_l->head_positions_interval ()[SMALLER];
170 && nu_l->balltype_i () == nd_l->balltype_i ();
173 if (!to_boolean (get_elt_property ("merge-differently-dotted")))
174 merge = merge && nu_l->dot_count () == nd_l->dot_count ();
177 notes are close, but can not be merged. Shift
179 if (abs(uppos - downpos) < 2 && !merge)
182 for (int i=0; i < clash_groups[d].size (); i++)
184 offsets[d][i] -= d * 0.5;
187 while ((flip (&d))!= UP);
192 for (int i=0; i < clash_groups[d].size (); i++)
193 tups = gh_cons (gh_cons (clash_groups[d][i]->self_scm_, gh_double2scm (offsets[d][i])),
196 while (flip (&d) != UP);
202 Collision::forced_shift ()
206 SCM s = get_elt_pointer ("elements");
207 for (; gh_pair_p (s); s = gh_cdr (s))
209 Score_element * se = unsmob_element (gh_car (s));
211 SCM force = se->remove_elt_property ("force-hshift");
212 if (gh_number_p (force))
214 tups = gh_cons (gh_cons (se->self_scm_, force),