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);
31 Collision::before_line_breaking ()
37 TODO: make callback of this.
40 Collision::do_shifts()
42 SCM autos (automatic_shift ());
43 SCM hand (forced_shift ());
44 Link_array<Score_element> done;
46 Real wid = paper_l ()->get_var ("collision_note_width");
47 for (; gh_pair_p (hand); hand =gh_cdr (hand))
49 Score_element * s = unsmob_element (gh_caar (hand));
50 Real amount = gh_scm2double (gh_cdar (hand));
52 s->translate_axis (amount *wid, X_AXIS);
55 for (; gh_pair_p (autos); autos =gh_cdr (autos))
57 Score_element * s = unsmob_element (gh_caar (autos));
58 Real amount = gh_scm2double (gh_cdar (autos));
61 s->translate_axis (amount * wid, X_AXIS);
65 /** This complicated routine moves note columns around horizontally to
66 ensure that notes don't clash.
68 This should be put into Scheme.
71 Collision::automatic_shift ()
73 Drul_array<Link_array<Note_column> > clash_groups;
74 Drul_array<Array<int> > shifts;
77 SCM s = get_elt_pointer ("elements");
78 for (; gh_pair_p (s); s = gh_cdr (s))
82 Score_element * se = unsmob_element (car);
83 if (Note_column * col = dynamic_cast<Note_column*> (se))
84 clash_groups[col->dir ()].push (col);
91 Array<int> & shift (shifts[d]);
92 Link_array<Note_column> & clashes (clash_groups[d]);
94 clashes.sort (Note_column::shift_compare);
96 for (int i=0; i < clashes.size (); i++)
99 = clashes[i]->get_elt_property ("horizontal-shift");
101 if (gh_number_p (sh))
102 shift.push (gh_scm2int (sh));
107 for (int i=1; i < shift.size (); i++)
109 if (shift[i-1] == shift[i])
111 warning (_ ("Too many clashing notecolumns. Ignoring them."));
116 while ((flip (&d))!= UP);
118 Drul_array< Array < Slice > > extents;
119 Drul_array< Array < Real > > offsets;
123 for (int i=0; i < clash_groups[d].size (); i++)
125 Slice s(clash_groups[d][i]->head_positions_interval ());
129 offsets[d].push (d * 0.5 * i);
132 while ((flip (&d))!= UP);
136 for (int i=1; i < clash_groups[d].size (); i++)
138 Slice prev =extents[d][i-1];
139 prev.intersect (extents[d][i]);
140 if (prev.length ()> 0 ||
141 (extents[-d].size () && d * (extents[d][i][-d] - extents[-d][0][d]) < 0))
142 for (int j = i; j < clash_groups[d].size (); j++)
143 offsets[d][j] += d * 0.5;
146 while ((flip (&d))!= UP);
149 if the up and down version are close, and can not be merged, move
150 all of them again. */
151 if (extents[UP].size () && extents[DOWN].size ())
153 Note_column *cu_l =clash_groups[UP][0];
154 Note_column *cd_l =clash_groups[DOWN][0];
160 Note_head * nu_l= cu_l->first_head();
161 Note_head * nd_l = cd_l->first_head();
163 int downpos = cd_l->head_positions_interval ()[BIGGER];
164 int uppos = cu_l->head_positions_interval ()[SMALLER];
168 && nu_l->balltype_i () == nd_l->balltype_i ();
171 if (!to_boolean (get_elt_property ("merge-differently-dotted")))
172 merge = merge && nu_l->dot_count () == nd_l->dot_count ();
175 notes are close, but can not be merged. Shift
177 if (abs(uppos - downpos) < 2 && !merge)
180 for (int i=0; i < clash_groups[d].size (); i++)
182 offsets[d][i] -= d * 0.5;
185 while ((flip (&d))!= UP);
190 for (int i=0; i < clash_groups[d].size (); i++)
191 tups = gh_cons (gh_cons (clash_groups[d][i]->self_scm_, gh_double2scm (offsets[d][i])),
194 while (flip (&d) != UP);
200 Collision::forced_shift ()
204 SCM s = get_elt_pointer ("elements");
205 for (; gh_pair_p (s); s = gh_cdr (s))
207 Score_element * se = unsmob_element (gh_car (s));
209 SCM force = se->remove_elt_property ("force-hshift");
210 if (gh_number_p (force))
212 tups = gh_cons (gh_cons (se->self_scm_, force),