2 slur.cc -- implement Slur
4 source file of the GNU LilyPond music typesetter
6 (c) 1996, 1997--1999, 1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
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"
38 Slur::add_column (Note_column*n)
40 if (!n->head_l_arr_.size ())
41 warning (_ ("Putting slur over rest."));
42 encompass_arr_.push (n);
43 n->stem_l_->slur_l_ = this;
48 Slur::set_default_dir ()
51 for (int i=0; i < encompass_arr_.size (); i ++)
53 if (encompass_arr_[i]->dir_ < 0)
62 Slur::do_add_processing ()
64 set_bounds (LEFT, encompass_arr_[0]);
65 if (encompass_arr_.size () > 1)
66 set_bounds (RIGHT, encompass_arr_.top ());
70 Slur::do_pre_processing ()
72 // don't set directions
76 Slur::do_substitute_dependency (Score_element*o, Score_element*n)
79 while ((i = encompass_arr_.find_i (dynamic_cast<Note_column *> (o))) >=0)
82 encompass_arr_[i] = dynamic_cast<Note_column *> (n);
84 encompass_arr_.del (i);
89 Note_column_compare (Note_column *const&n1 , Note_column* const&n2)
91 return Item::left_right_compare (n1, n2);
95 Slur::do_post_processing ()
97 encompass_arr_.sort (Note_column_compare);
101 Real interline_f = paper ()->interline_f ();
102 Real internote_f = interline_f / 2;
104 Real notewidth_f = paper ()->note_width () * 0.8;
107 [OSU]: slur and tie placement
110 * x = centre of head (upside-down: inner raakpunt stem) - d * gap
112 * y = length < 5ss : horizontal raakpunt + d * 0.25 ss
113 y = length >= 5ss : y next interline - d * 0.25 ss
114 --> height <= 5 length ?? we use <= 3 length, now...
117 Real gap_f = paper ()->get_var ("slur_x_gap");
119 Drul_array<Note_column*> extrema;
120 extrema[LEFT] = encompass_arr_[0];
121 extrema[RIGHT] = encompass_arr_.top ();
125 #define BROKEN_SLUR_b(dir) \
126 (extrema[dir] != spanned_drul_[d])
127 #define NORMAL_SLUR_b(dir) \
128 (extrema[dir]->stem_l_ \
129 && !extrema[dir]->stem_l_->transparent_b_ \
130 && extrema[dir]->head_l_arr_.size ())
134 if (BROKEN_SLUR_b (d))
136 // ugh -- check if needed
138 *(spanned_drul_[d]->extent (X_AXIS).length () - 0.5 * notewidth_f);
143 dx_f_drul_[LEFT] = spanned_drul_[LEFT]->extent (X_AXIS).length ();
145 // urg -- check if needed
146 if (encompass_arr_.size () > 1)
147 dx_f_drul_[RIGHT] += notewidth_f;
153 else if (NORMAL_SLUR_b (d))
155 Real notewidth_f = extrema[d]->extent (X_AXIS).length ();
156 dy_f_drul_[d] = (int)rint (extrema[d]->stem_l_-> extent (Y_AXIS)[dir_]);
157 dx_f_drul_[d] += 0.5 * notewidth_f - d * gap_f;
158 if (dir_ == extrema[d]->stem_l_->dir_)
161 dx_f_drul_[d] += 0.5 * (dir_ * d) * d * notewidth_f;
163 dx_f_drul_[d] += 0.25 * (dir_ * d) * d * notewidth_f;
168 Real notewidth_f = extrema[d]->extent (X_AXIS).length ();
169 dy_f_drul_[d] = (int)rint (extrema[d]->head_positions_interval ()
170 [dir_]) * internote_f;
171 dx_f_drul_[d] += 0.5 * notewidth_f - d * gap_f;
173 dy_f_drul_[d] += dir_ * interline_f;
174 if (extrema[d]->stem_l_ && (dir_ == extrema[d]->stem_l_->dir_))
175 dy_f_drul_[d] -= dir_ * internote_f;
177 while (flip(&d) != LEFT);
179 // now that both are set, do dependent
182 if (BROKEN_SLUR_b (d))
189 dy_f_drul_[u] += dir_ * internote_f;
191 dy_f_drul_[d] = dy_f_drul_[u];
194 while (flip(&d) != LEFT);
197 Slur should follow line of music
199 if (!BROKEN_SLUR_b (LEFT) && !BROKEN_SLUR_b (RIGHT)
200 && NORMAL_SLUR_b (LEFT) && NORMAL_SLUR_b (RIGHT)
201 && (extrema[LEFT]->stem_l_ != extrema[RIGHT]->stem_l_))
203 Real note_dy = extrema[RIGHT]->stem_l_->head_positions ()[dir_]
204 - extrema[LEFT]->stem_l_->head_positions ()[dir_];
205 Real dy = dy_f_drul_[RIGHT] - dy_f_drul_[LEFT];
207 Should we always follow note-heads, (like a tie)?
208 For now, only if the note_dy != slur_dy, we'll do
209 slur_dy := note_dy * factor.
211 if (sign (dy) != sign (note_dy))
213 Real damp_f = paper ()->get_var ("slur_slope_follow_music_factor");
214 Real realdy = note_dy * damp_f;
215 Direction adjust_dir = (Direction)(- dir_ * sign (realdy));
219 adjust only if no beam gets in the way
221 if (!extrema[adjust_dir]->stem_l_->beam_l_
222 || (adjust_dir == extrema[adjust_dir]->stem_l_->dir_)
223 || (extrema[adjust_dir]->stem_l_->beams_i_drul_[-adjust_dir] < 1))
225 dy_f_drul_[adjust_dir] = dy_f_drul_[-adjust_dir]
226 + 2 * adjust_dir * realdy;
227 Real dx = notewidth_f / 2;
228 if (adjust_dir != extrema[adjust_dir]->stem_l_->dir_)
230 dx_f_drul_[adjust_dir] -= adjust_dir * dx;
236 Avoid too steep slurs.
238 Real damp_f = paper ()->get_var ("slur_slope_damping");
239 Offset d_off = Offset (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT],
240 dy_f_drul_[RIGHT] - dy_f_drul_[LEFT]);
241 d_off[X_AXIS] += extent (X_AXIS).length ();
243 Real ratio_f = abs (d_off[Y_AXIS] / d_off[X_AXIS]);
244 if (ratio_f > damp_f)
245 dy_f_drul_[(Direction)(- dir_ * sign (d_off[Y_AXIS]))] +=
246 dir_ * (ratio_f - damp_f) * d_off[X_AXIS];
250 Slur::get_encompass_offset_arr () const
252 Real notewidth = paper ()->note_width () * 0.8;
253 Real gap = paper ()->get_var ("slur_x_gap");
254 Real internote = paper ()->internote_f ();
256 Offset left = Offset (dx_f_drul_[LEFT], dy_f_drul_[LEFT]);
257 left[X_AXIS] += encompass_arr_[0]->stem_l_->hpos_f ();
261 i don't understand these two, but *must* for symmetry
262 look at encompass array:
263 lilypond -D input/test/slur-symmetry*.ly
264 lilypond -D input/test/sleur.ly
266 do_post_processing should have calculated these into
271 if (dir_ != encompass_arr_[0]->stem_l_->dir_)
272 left[X_AXIS] += - 0.5 * notewidth * encompass_arr_[0]->stem_l_->dir_
274 else if (encompass_arr_[0]->stem_l_->dir_ == UP)
275 left[X_AXIS] -= notewidth;
277 if ((dir_ == encompass_arr_[0]->stem_l_->dir_)
278 && (encompass_arr_[0]->stem_l_->dir_ == DOWN))
279 left[Y_AXIS] -= internote * encompass_arr_[0]->stem_l_->dir_;
282 Offset d = Offset (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT],
283 dy_f_drul_[RIGHT] - dy_f_drul_[LEFT]);
284 d[X_AXIS] += extent (X_AXIS).length ();
287 int last = encompass_arr_.size () - 1;
290 if (encompass_arr_.top () != spanned_drul_[RIGHT])
294 if (encompass_arr_[0] != spanned_drul_[LEFT])
298 notes.push (Offset (0,0));
300 for (int i = first; i < last; i++)
302 Encompass_info info (encompass_arr_[i], dir_);
303 notes.push (info.o_ - left);
305 Encompass_info info (encompass_arr_.top (), dir_);
306 // [encompass_arr_.size () - 1]
309 Slur* urg = (Slur*)this;
310 urg->interstaff_f_ = info.interstaff_f_;
312 d[Y_AXIS] += interstaff_f_;
315 if (interstaff_f_ && (encompass_arr_.top () != spanned_drul_[RIGHT]))
317 Encompass_info info (encompass_arr_[encompass_arr_.size () - 1], dir_);
318 d[Y_AXIS] -= info.o_[Y_AXIS] - interstaff_f_;
328 Slur::get_rods () const
332 r.item_l_drul_ = spanned_drul_;
333 r.distance_f_ = paper ()->get_var ("slur_x_minimum");