2 slur.cc -- implement Slur
4 source file of the GNU LilyPond music typesetter
6 (c) 1996, 1997--1998, 1998 Han-Wen Nienhuys <hanwen@stack.nl>
7 Jan Nieuwenhuizen <jan@digicash.com>
12 * URG: share code with tie
13 * begin and end should be treated as a Script.
15 * slur from notehead to stemend: c''()b''
21 #include "paper-def.hh"
22 #include "note-column.hh"
25 #include "molecule.hh"
29 #include "encompass-info.hh"
32 IMPLEMENT_IS_TYPE_B1(Slur,Bow);
39 Slur::add (Note_column*n)
41 encompass_arr_.push (n);
46 Slur::set_default_dir ()
49 for (int i=0; i < encompass_arr_.size (); i ++)
51 if (encompass_arr_[i]->dir_ < 0)
60 Slur::do_add_processing ()
62 set_bounds (LEFT, encompass_arr_[0]);
63 if (encompass_arr_.size () > 1)
64 set_bounds (RIGHT, encompass_arr_.top ());
68 Slur::do_pre_processing ()
70 // don't set directions
74 Slur::do_substitute_dependency (Score_elem*o, Score_elem*n)
77 while ((i = encompass_arr_.find_i ((Note_column*)o->item ())) >=0)
80 encompass_arr_[i] = (Note_column*)n->item ();
82 encompass_arr_.del (i);
87 Note_column_compare (Note_column *const&n1 , Note_column* const&n2)
89 return Item::left_right_compare (n1, n2);
93 Slur::do_post_processing ()
95 encompass_arr_.sort (Note_column_compare);
99 Real interline_f = paper ()->interline_f ();
100 Real internote_f = interline_f / 2;
101 Real notewidth_f = paper ()->note_width ();
102 Real slur_min = paper ()->get_var ("slur_x_minimum");
105 [OSU]: slur and tie placement
108 * x = centre of head (upside-down: inner raakpunt stem) - d * gap
110 * y = length < 5ss : horizontal raakpunt + d * 0.25 ss
111 y = length >= 5ss : y next interline - d * 0.25 ss
112 --> height <= 5 length ?? we use <= 3 length, now...
115 Real gap_f = paper ()->get_var ("slur_x_gap");
117 Drul_array<Note_column*> extrema;
118 extrema[LEFT] = encompass_arr_[0];
119 extrema[RIGHT] = encompass_arr_.top ();
128 if (extrema[d] != spanned_drul_[d])
130 // ugh -- check if needed
132 *(spanned_drul_[d]->width ().length () - 0.5 * notewidth_f);
137 dx_f_drul_[LEFT] = spanned_drul_[LEFT]->width ().length ();
139 // urg -- check if needed
140 if (encompass_arr_.size () > 1)
141 dx_f_drul_[RIGHT] += notewidth_f;
147 else if (extrema[d]->stem_l_ && !extrema[d]->stem_l_->transparent_b_)
149 Real notewidth_f = extrema[d]->width ().length ();
150 dy_f_drul_[d] = (int)rint (extrema[d]->stem_l_->height ()[dir_]);
151 dx_f_drul_[d] += 0.5 * notewidth_f - d * gap_f;
152 if (dir_ == extrema[d]->stem_l_->dir_)
155 dx_f_drul_[d] += 0.5 * (dir_ * d) * d * notewidth_f;
157 dx_f_drul_[d] += 0.25 * (dir_ * d) * d * notewidth_f;
162 Real notewidth_f = extrema[d]->width ().length ();
163 dy_f_drul_[d] = (int)rint (extrema[d]->head_positions_interval ()
164 [dir_]) * internote_f;
165 dx_f_drul_[d] += 0.5 * notewidth_f - d * gap_f;
167 dy_f_drul_[d] += dir_ * interline_f;
168 if (extrema[d]->stem_l_ && (dir_ == extrema[d]->stem_l_->dir_))
169 dy_f_drul_[d] -= dir_ * internote_f;
171 while (flip(&d) != LEFT);
173 // now that both are set, do dependent
179 if (extrema[d] != spanned_drul_[d])
186 dy_f_drul_[u] += dir_ * internote_f;
188 dy_f_drul_[d] = dy_f_drul_[(Direction)-d];
191 if (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT] < slur_min)
193 dx_f_drul_[d] -= d * slur_min
194 - (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT]);
195 dx_f_drul_[d] = dx_f_drul_[(Direction)-d] + d * slur_min;
199 while (flip(&d) != LEFT);
202 Avoid too steep slurs.
203 * slur from notehead to stemend: c''()b''
205 Real damp_f = paper ()->get_var ("slur_slope_damping");
206 Offset d_off = Offset (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT],
207 dy_f_drul_[RIGHT] - dy_f_drul_[LEFT]);
208 d_off.x () += width ().length ();
210 Real ratio_f = abs (d_off.y () / d_off.x ());
211 if (ratio_f > damp_f)
212 dy_f_drul_[(Direction)(- dir_ * sign (d_off.y ()))] -=
213 dir_ * (damp_f - ratio_f) * d_off.x ();
217 Slur::get_encompass_offset_arr () const
219 Offset left = Offset (dx_f_drul_[LEFT], dy_f_drul_[LEFT]);
220 left.x () += encompass_arr_[0]->stem_l_->hpos_f ();
222 Offset d = Offset (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT],
223 dy_f_drul_[RIGHT] - dy_f_drul_[LEFT]);
224 d.x () += width ().length ();
227 int last = encompass_arr_.size () - 1;
230 if (encompass_arr_[0] != spanned_drul_[LEFT])
234 if (encompass_arr_.top () != spanned_drul_[RIGHT])
241 notes.push (Offset (0,0));
243 for (int i = first; i < last; i++)
245 Encompass_info info (encompass_arr_[i], dir_);
246 notes.push (info.o_ - left);
252 int n = last - first + 2;
253 Array<Offset> notes (n);
254 notes[0] = Offset (0,0);
256 for (int i = first; i < last; i++)
258 Encompass_info info (encompass_arr_[i], dir_);
259 notes[i - first + 1] = info.o_ - left;
261 notes[n - 1] = Offset (d);