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()
18 Axis_group_interface (this).set_interface ();
19 Axis_group_interface (this).set_axes (X_AXIS, Y_AXIS);
23 Collision::add_column (Note_column* ncol_l)
25 Axis_group_interface (this).add_element (ncol_l);
26 add_dependency (ncol_l);
30 Collision::before_line_breaking ()
36 TODO: make callback of this.
39 Collision::do_shifts()
41 SCM autos (automatic_shift ());
42 SCM hand (forced_shift ());
43 Link_array<Score_element> done;
45 Real wid = paper_l ()->get_var ("collision_note_width");
46 for (; gh_pair_p (hand); hand =gh_cdr (hand))
48 Score_element * s = unsmob_element (gh_caar (hand));
49 Real amount = gh_scm2double (gh_cdar (hand));
51 s->translate_axis (amount *wid, X_AXIS);
54 for (; gh_pair_p (autos); autos =gh_cdr (autos))
56 Score_element * s = unsmob_element (gh_caar (autos));
57 Real amount = gh_scm2double (gh_cdar (autos));
60 s->translate_axis (amount * wid, X_AXIS);
64 /** This complicated routine moves note columns around horizontally to
65 ensure that notes don't clash.
67 This should be put into Scheme.
70 Collision::automatic_shift ()
72 Drul_array<Link_array<Note_column> > clash_groups;
73 Drul_array<Array<int> > shifts;
76 SCM s = get_elt_property ("elements");
77 for (; gh_pair_p (s); s = gh_cdr (s))
81 Score_element * se = unsmob_element (car);
82 if (Note_column * col = dynamic_cast<Note_column*> (se))
83 clash_groups[col->dir ()].push (col);
90 Array<int> & shift (shifts[d]);
91 Link_array<Note_column> & clashes (clash_groups[d]);
93 clashes.sort (Note_column::shift_compare);
95 for (int i=0; i < clashes.size (); i++)
98 = clashes[i]->remove_elt_property ("horizontal-shift");
100 if (gh_number_p (sh))
101 shift.push (gh_scm2int (sh));
106 for (int i=1; i < shift.size (); i++)
108 if (shift[i-1] == shift[i])
110 warning (_ ("Too many clashing notecolumns. Ignoring them."));
115 while ((flip (&d))!= UP);
117 Drul_array< Array < Slice > > extents;
118 Drul_array< Array < Real > > offsets;
122 for (int i=0; i < clash_groups[d].size (); i++)
124 Slice s(clash_groups[d][i]->head_positions_interval ());
128 offsets[d].push (d * 0.5 * i);
131 while ((flip (&d))!= UP);
135 for (int i=1; i < clash_groups[d].size (); i++)
137 Slice prev =extents[d][i-1];
138 prev.intersect (extents[d][i]);
139 if (prev.length ()> 0 ||
140 (extents[-d].size () && d * (extents[d][i][-d] - extents[-d][0][d]) < 0))
141 for (int j = i; j < clash_groups[d].size (); j++)
142 offsets[d][j] += d * 0.5;
145 while ((flip (&d))!= UP);
148 if the up and down version are close, and can not be merged, move
149 all of them again. */
150 if (extents[UP].size () && extents[DOWN].size ())
152 Note_column *cu_l =clash_groups[UP][0];
153 Note_column *cd_l =clash_groups[DOWN][0];
159 Note_head * nu_l= cu_l->first_head();
160 Note_head * nd_l = cd_l->first_head();
162 int downpos = cd_l->head_positions_interval ()[BIGGER];
163 int uppos = cu_l->head_positions_interval ()[SMALLER];
167 && nu_l->balltype_i () == nd_l->balltype_i ();
170 if (!to_boolean (get_elt_property ("merge-differently-dotted")))
171 merge = merge && nu_l->dot_count () == nd_l->dot_count ();
174 notes are close, but can not be merged. Shift
176 if (abs(uppos - downpos) < 2 && !merge)
179 for (int i=0; i < clash_groups[d].size (); i++)
181 offsets[d][i] -= d * 0.5;
184 while ((flip (&d))!= UP);
189 for (int i=0; i < clash_groups[d].size (); i++)
190 tups = gh_cons (gh_cons (clash_groups[d][i]->self_scm_, gh_double2scm (offsets[d][i])),
193 while (flip (&d) != UP);
199 Collision::forced_shift ()
203 SCM s = get_elt_property ("elements");
204 for (; gh_pair_p (s); s = gh_cdr (s))
206 Score_element * se = unsmob_element ( gh_car (s));
208 SCM force = se->remove_elt_property ("force-hshift");
209 if (gh_number_p (force))
211 tups = gh_cons (gh_cons (se->self_scm_, force),