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::get_default_dir () const
51 for (int i=0; i < encompass_arr_.size (); i ++)
53 if (encompass_arr_[i]->dir () < 0)
63 Slur::do_add_processing ()
65 set_bounds (LEFT, encompass_arr_[0]);
66 if (encompass_arr_.size () > 1)
67 set_bounds (RIGHT, encompass_arr_.top ());
71 Slur::do_pre_processing ()
73 // don't set directions
77 Slur::do_substitute_element_pointer (Score_element*o, Score_element*n)
80 while ((i = encompass_arr_.find_i (dynamic_cast<Note_column *> (o))) >=0)
83 encompass_arr_[i] = dynamic_cast<Note_column *> (n);
85 encompass_arr_.del (i);
90 Note_column_compare (Note_column *const&n1 , Note_column* const&n2)
92 return Item::left_right_compare (n1, n2);
96 Slur::broken_edge_b ( Direction dir) const
98 return extrema ()[dir] != spanned_drul_[dir];
102 Slur::normal_edge_b ( Direction dir) const
104 Note_column *n = extrema ()[dir];
105 return !broken_edge_b ( dir)
107 && n->stem_l_->get_elt_property (transparent_scm_sym) == SCM_BOOL_F
108 && n->head_l_arr_.size ();
111 Drul_array<Note_column*>
112 Slur::extrema ()const
114 Drul_array<Note_column*> extrema;
115 extrema[LEFT] = encompass_arr_[0];
116 extrema[RIGHT] = encompass_arr_.top ();
126 Slur::do_post_processing ()
128 encompass_arr_.sort (Note_column_compare);
130 dir_ = get_default_dir ();
132 Real interline_f = paper_l ()->get_realvar (interline_scm_sym);
133 Real internote_f = interline_f / 2;
135 Real notewidth_f = paper_l ()->note_width () * 0.8;
138 [OSU]: slur and tie placement
141 * x = center of head (upside-down: inner raakpunt stem) - d * gap
143 * y = length < 5ss : horizontal raakpunt + d * 0.25 ss
144 y = length >= 5ss : y next interline - d * 0.25 ss
145 --> height <= 5 length ?? we use <= 3 length, now...
148 Real gap_f = paper_l ()->get_var ("slur_x_gap");
155 if (broken_edge_b (d))
157 // ugh -- check if needed
159 *(spanned_drul_[d]->extent (X_AXIS).length () - 0.5 * notewidth_f);
164 dx_f_drul_[LEFT] = spanned_drul_[LEFT]->extent (X_AXIS).length ();
166 // urg -- check if needed
167 if (encompass_arr_.size () > 1)
168 dx_f_drul_[RIGHT] += notewidth_f;
174 else if (normal_edge_b (d))
176 Real notewidth_f = extrema ()[d]->extent (X_AXIS).length ();
177 dy_f_drul_[d] = (int)rint (extrema ()[d]->stem_l_-> extent (Y_AXIS)[dir_]);
178 dx_f_drul_[d] += 0.5 * notewidth_f - d * gap_f;
179 if (dir_ == extrema ()[d]->stem_l_->dir_)
182 dx_f_drul_[d] += 0.5 * dir_ * notewidth_f;
184 dx_f_drul_[d] += 0.25 * dir_ * notewidth_f;
189 Real notewidth_f = extrema ()[d]->extent (X_AXIS).length ();
190 dy_f_drul_[d] = (int)rint (extrema ()[d]->head_positions_interval ()
191 [dir_]) * internote_f;
192 dx_f_drul_[d] += 0.5 * notewidth_f - d * gap_f;
194 dy_f_drul_[d] += dir_ * interline_f;
195 if (extrema ()[d]->stem_l_ && (dir_ == extrema ()[d]->stem_l_->dir_))
196 dy_f_drul_[d] -= dir_ * internote_f;
198 while (flip(&d) != LEFT);
200 // now that both are set, do dependent
203 if (broken_edge_b (d))
210 dy_f_drul_[u] += dir_ * internote_f;
212 dy_f_drul_[d] = dy_f_drul_[u];
215 while (flip(&d) != LEFT);
218 Slur should follow line of music
220 if (normal_edge_b (LEFT)
221 && normal_edge_b (RIGHT)
222 && (extrema ()[LEFT]->stem_l_ != extrema ()[RIGHT]->stem_l_))
224 Real note_dy = extrema ()[RIGHT]->stem_l_->head_positions ()[dir_]
225 - extrema ()[LEFT]->stem_l_->head_positions ()[dir_];
226 Real dy = dy_f_drul_[RIGHT] - dy_f_drul_[LEFT];
228 Should we always follow note-heads, (like a tie)?
229 For now, only if the note_dy != slur_dy, we'll do
230 slur_dy := note_dy * factor.
232 if (sign (dy) != sign (note_dy))
234 Real damp_f = paper_l ()->get_var ("slur_slope_follow_music_factor");
235 Real realdy = note_dy * damp_f;
236 Direction adjust_dir = (Direction)(- dir_ * sign (realdy));
240 adjust only if no beam gets in the way
242 if (!extrema ()[adjust_dir]->stem_l_->beam_l_
243 || (adjust_dir == extrema ()[adjust_dir]->stem_l_->dir_)
244 || (extrema ()[adjust_dir]->stem_l_->beams_i_drul_[-adjust_dir] < 1))
246 dy_f_drul_[adjust_dir] = dy_f_drul_[-adjust_dir]
247 + 2 * adjust_dir * realdy;
248 Real dx = notewidth_f / 2;
249 if (adjust_dir != extrema ()[adjust_dir]->stem_l_->dir_)
251 dx_f_drul_[adjust_dir] -= adjust_dir * dx;
257 Avoid too steep slurs.
259 Real damp_f = paper_l ()->get_var ("slur_slope_damping");
260 Offset d_off = Offset (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT],
261 dy_f_drul_[RIGHT] - dy_f_drul_[LEFT]);
262 d_off[X_AXIS] += extent (X_AXIS).length ();
264 Real ratio_f = abs (d_off[Y_AXIS] / d_off[X_AXIS]);
265 if (ratio_f > damp_f)
266 dy_f_drul_[(Direction)(- dir_ * sign (d_off[Y_AXIS]))] +=
267 dir_ * (ratio_f - damp_f) * d_off[X_AXIS];
271 Slur::get_encompass_offset_arr () const
273 Real notewidth = paper_l ()->note_width () * 0.8;
274 Real gap = paper_l ()->get_var ("slur_x_gap");
277 urg. Calcs done wrt the leftmost note. Fixme.
279 Calcs ignore possibility of pre/postbreak.
284 Offset left = Offset (dx_f_drul_[LEFT], dy_f_drul_[LEFT]);
285 left[X_AXIS] += encompass_arr_[0]->stem_l_->hpos_f ();
287 Real internote = encompass_arr_[0]->stem_l_->staff_line_leading_f ()/2.0;
291 i don't understand these two, but *must* for symmetry
292 look at encompass array:
293 lilypond -D input/test/slur-symmetry*.ly
294 lilypond -D input/test/sleur.ly
296 do_post_processing should have calculated these into
301 if (dir_ != encompass_arr_[0]->stem_l_->dir_)
302 left[X_AXIS] += - 0.5 * notewidth * encompass_arr_[0]->stem_l_->dir_
304 else if (encompass_arr_[0]->stem_l_->dir_ == UP)
305 left[X_AXIS] -= notewidth;
307 if ((dir_ == encompass_arr_[0]->stem_l_->dir_)
308 && (encompass_arr_[0]->stem_l_->dir_ == DOWN))
309 left[Y_AXIS] -= internote * encompass_arr_[0]->stem_l_->dir_;
312 Offset d = Offset (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT],
313 dy_f_drul_[RIGHT] - dy_f_drul_[LEFT]);
314 d[X_AXIS] += extent (X_AXIS).length ();
317 int last = encompass_arr_.size () - 1;
321 notes.push (Offset (0,0));
324 if (broken_edge_b (RIGHT))
328 Encompass_info info (encompass_arr_.top (), dir_, this);
329 d[Y_AXIS] += info.interstaff_f_;
333 if (broken_edge_b (LEFT))
337 Encompass_info info (encompass_arr_[0], dir_, this);
338 notes[0][Y_AXIS] += info.interstaff_f_;
341 for (int i = first; i < last; i++)
343 Encompass_info info (encompass_arr_[i], dir_, this);
344 notes.push (info.o_ - left);
354 Slur::get_rods () const
358 r.item_l_drul_ = spanned_drul_;
359 r.distance_f_ = paper_l ()->get_var ("slur_x_minimum");