2 slur.cc -- implement Slur
4 source file of the GNU LilyPond music typesetter
6 (c) 1996, 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
12 * begin and end should be treated as a/acknowledge Scripts.
13 * broken slur should have uniform trend
16 #include "directional-element-interface.hh"
17 #include "group-interface.hh"
20 #include "paper-def.hh"
21 #include "note-column.hh"
23 #include "paper-column.hh"
24 #include "molecule.hh"
29 #include "cross-staff.hh"
30 #include "group-interface.hh"
34 set_elt_property ("note-columns", SCM_EOL);
38 Slur::add_column (Note_column*n)
40 if (!gh_pair_p (n->get_elt_property ("note-heads")))
41 warning (_ ("Putting slur over rest. Ignoring."));
44 Group_interface gi (this, "note-columns");
51 Slur::get_default_dir () const
53 Link_array<Note_column> encompass_arr =
54 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
57 for (int i=0; i < encompass_arr.size (); i ++)
59 if (encompass_arr[i]->dir () < 0)
69 Slur::do_add_processing ()
71 Link_array<Note_column> encompass_arr =
72 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
73 set_bounds (LEFT, encompass_arr[0]);
74 if (encompass_arr.size () > 1)
75 set_bounds (RIGHT, encompass_arr.top ());
81 Slur::encompass_offset (Note_column const* col) const
84 Stem* stem_l = col->stem_l ();
85 Direction dir = directional_element (this).get ();
89 warning (_ ("Slur over rest?"));
90 o[X_AXIS] = col->hpos_f ();
91 o[Y_AXIS] = col->extent (Y_AXIS)[dir];
94 Direction stem_dir = directional_element (stem_l).get ();
95 o[X_AXIS] = stem_l->hpos_f ();
98 Simply set x to middle of notehead
101 o[X_AXIS] -= 0.5 * stem_dir * col->extent (X_AXIS).length ();
103 if ((stem_dir == dir)
104 && !stem_l->extent (Y_AXIS).empty_b ())
106 o[Y_AXIS] = stem_l->extent (Y_AXIS)[dir];
110 o[Y_AXIS] = col->extent (Y_AXIS)[dir];
114 leave a gap: slur mustn't touch head/stem
116 o[Y_AXIS] += dir * paper_l ()->get_var ("slur_y_free");
117 o[Y_AXIS] -= calc_interstaff_dist (stem_l, this);
127 Slur::do_post_processing ()
129 Link_array<Note_column> encompass_arr =
130 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
132 if (!encompass_arr.size ())
134 set_elt_property ("transparent", SCM_BOOL_T);
140 if (!directional_element (this).get ())
141 directional_element (this).set (get_default_dir ());
144 Slur and tie placement [OSU]
147 * x = centre of head - d * x_gap_f
150 * y = length < 5ss : horizontal tangent + d * 0.25 ss
151 y = length >= 5ss : y next interline - d * 0.25 ss
154 Real staff_space = paper_l ()->get_var ("interline");
155 Real half_staff_space = staff_space / 2;
157 Real x_gap_f = paper_l ()->get_var ("slur_x_gap");
158 Real y_gap_f = paper_l ()->get_var ("slur_y_gap");
160 Drul_array<Note_column*> note_column_drul;
161 note_column_drul[LEFT] = encompass_arr[0];
162 note_column_drul[RIGHT] = encompass_arr.top ();
164 bool fix_broken_b = false;
166 Direction my_dir = directional_element (this).get ();
174 if ((note_column_drul[d] == spanned_drul_[d])
175 && note_column_drul[d]->first_head ()
176 && (note_column_drul[d]->stem_l ()))
178 Stem* stem_l = note_column_drul[d]->stem_l ();
180 side directly attached to note head;
181 no beam getting in the way
183 if ((stem_l->extent (Y_AXIS).empty_b ()
184 || !((stem_l->get_direction () == my_dir) && (my_dir != d)))
185 && !((my_dir == stem_l->get_direction ())
186 && stem_l->beam_l () && (stem_l->beam_count (-d) >= 1)))
188 dx_f_drul_[d] = spanned_drul_[d]->extent (X_AXIS).length () / 2;
189 dx_f_drul_[d] -= d * x_gap_f;
191 if (stem_l->get_direction () != my_dir)
193 dy_f_drul_[d] = note_column_drul[d]->extent (Y_AXIS)[my_dir];
197 dy_f_drul_[d] = stem_l->chord_start_f ()
198 + my_dir * half_staff_space;
200 dy_f_drul_[d] += my_dir * y_gap_f;
203 side attached to (visible) stem
207 dx_f_drul_[d] = stem_l->hpos_f ()
208 - spanned_drul_[d]->relative_coordinate (0, X_AXIS);
210 side attached to beamed stem
212 if (stem_l->beam_l () && (stem_l->beam_count (-d) >= 1))
214 dy_f_drul_[d] = stem_l->extent (Y_AXIS)[my_dir];
215 dy_f_drul_[d] += my_dir * 2 * y_gap_f;
218 side attached to notehead, with stem getting in the way
222 dx_f_drul_[d] -= d * x_gap_f;
224 dy_f_drul_[d] = stem_l->chord_start_f ()
225 + my_dir * half_staff_space;
226 dy_f_drul_[d] += my_dir * y_gap_f;
235 dx_f_drul_[d] = get_broken_left_end_align ();
238 broken: should get y from other piece, so that slur
239 continues up/down trend
241 for now: be horizontal..
246 while (flip (&d) != LEFT);
248 int cross_count = cross_staff_count ();
249 bool interstaff_b = (0 < cross_count) && (cross_count < encompass_arr.size ());
251 Drul_array<Offset> info_drul;
252 Drul_array<Real> interstaff_interval;
256 info_drul[d] = encompass_offset (encompass_arr.boundary (d, 0));
257 interstaff_interval[d] = - calc_interstaff_dist (encompass_arr.boundary (d,0),
260 while (flip (&d) != LEFT);
262 Real interstaff_f = interstaff_interval[RIGHT] - interstaff_interval[LEFT];
266 Direction d = (encompass_arr.top () != spanned_drul_[RIGHT]) ?
268 dy_f_drul_[d] = info_drul[d][Y_AXIS];
271 dy_f_drul_[d] -= interstaff_interval[d];
272 if (cross_count) // interstaff_i ?
274 dy_f_drul_[LEFT] += interstaff_interval[d];
275 dy_f_drul_[RIGHT] += interstaff_interval[d];
282 Now we've got a fine slur
283 Catch and correct some ugly cases
285 String infix = interstaff_b ? "interstaff_" : "";
286 Real height_damp_f = paper_l ()->get_var ("slur_"+infix +"height_damping");
287 Real slope_damp_f = paper_l ()->get_var ("slur_"+infix +"slope_damping");
288 Real snap_f = paper_l ()->get_var ("slur_"+infix +"snap_to_stem");
289 Real snap_max_dy_f = paper_l ()->get_var ("slur_"+infix +"snap_max_slope_change");
292 dy_f_drul_[RIGHT] += interstaff_f;
294 Real dy_f = dy_f_drul_[RIGHT] - dy_f_drul_[LEFT];
296 dy_f -= interstaff_f;
297 Real dx_f = spanner_length ()+ dx_f_drul_[RIGHT] - dx_f_drul_[LEFT];
300 Avoid too steep slurs.
302 Real slope_ratio_f = abs (dy_f / dx_f);
303 if (slope_ratio_f > slope_damp_f)
305 Direction d = (Direction)(- my_dir * (sign (dy_f)));
308 Real damp_f = (slope_ratio_f - slope_damp_f) * dx_f;
310 must never change sign of dy
312 damp_f = damp_f <? abs (dy_f);
313 dy_f_drul_[d] += my_dir * damp_f;
319 Wierd slurs may look a lot better after they have been
321 So, we'll do this in 3 steps
323 for (int i = 0; i < 3; i++)
325 Real height_f = curve_extent (Y_AXIS).length ();
326 Real width_f = curve_extent (X_AXIS).length ();
328 dy_f = dy_f_drul_[RIGHT] - dy_f_drul_[LEFT];
330 dy_f -= interstaff_f;
332 Real height_ratio_f = abs (height_f / width_f);
333 if (height_ratio_f > height_damp_f)
335 Direction d = (Direction)(- my_dir * (sign (dy_f)));
338 /* take third step */
339 Real damp_f = (height_ratio_f - height_damp_f) * width_f / 3;
341 if y positions at about the same height, correct both ends
343 if (abs (dy_f / dx_f ) < slope_damp_f)
345 dy_f_drul_[-d] += my_dir * damp_f;
346 dy_f_drul_[d] += my_dir * damp_f;
349 don't change slope too much, would have been catched by slope damping
353 damp_f = damp_f <? abs (dy_f/2);
354 dy_f_drul_[d] += my_dir * damp_f;
360 If, after correcting, we're close to stem-end...
362 Drul_array<Real> snapy_f_drul;
363 snapy_f_drul[LEFT] = snapy_f_drul[RIGHT] = 0;
364 Drul_array<Real> snapx_f_drul;
365 snapx_f_drul[LEFT] = snapx_f_drul[RIGHT] = 0;
366 Drul_array<bool> snapped_b_drul;
367 snapped_b_drul[LEFT] = snapped_b_drul[RIGHT] = false;
370 Note_column * nc = note_column_drul[d];
371 if (nc == spanned_drul_[d]
373 && nc->stem_l ()->get_direction () == my_dir
374 && abs (nc->stem_l ()->extent (Y_AXIS)[my_dir]
375 - dy_f_drul_[d] + (d == LEFT ? 0 : interstaff_f))
379 prepare to attach to stem-end
381 snapx_f_drul[d] = nc->stem_l ()->hpos_f ()
382 - spanned_drul_[d]->relative_coordinate (0, X_AXIS);
384 snapy_f_drul[d] = nc->stem_l ()->extent (Y_AXIS)[my_dir]
385 + interstaff_interval[d]
386 + my_dir * 2 * y_gap_f;
388 snapped_b_drul[d] = true;
391 while (flip (&d) != LEFT);
394 only use snapped positions if sign (dy) will not change
395 and dy doesn't change too much
398 dy_f += interstaff_f;
404 More refactoring could be done.
406 Real maxsnap = abs (dy_f * snap_max_dy_f);
407 if (snapped_b_drul[LEFT] && snapped_b_drul[RIGHT]
408 && ((sign (snapy_f_drul[RIGHT] - snapy_f_drul[LEFT]) == sign (dy_f)))
409 && (!dy_f || (abs (snapy_f_drul[RIGHT] - snapy_f_drul[LEFT] - dy_f)
412 dy_f_drul_ = snapy_f_drul;
413 dx_f_drul_ = snapx_f_drul;
418 Direction od = (Direction)-d;
419 if (snapped_b_drul[d]
420 && d * sign (snapy_f_drul[d] - dy_f_drul_[od]) == sign (dy_f)
421 && (!dy_f || (abs (snapy_f_drul[d] - dy_f_drul_[od] - d * dy_f)
424 dy_f_drul_[d] = snapy_f_drul[d];
425 dx_f_drul_[d] = snapx_f_drul[d];
428 while (flip (&d) != LEFT);
433 Slur::cross_staff_count ()const
435 Link_array<Note_column> encompass_arr =
436 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
440 for (int i = 0; i < encompass_arr.size (); i++)
442 if (calc_interstaff_dist (encompass_arr[i], this))
450 Slur::get_encompass_offset_arr () const
452 Link_array<Note_column> encompass_arr =
453 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
455 Array<Offset> offset_arr;
458 check non-disturbed slur
459 FIXME: x of ends off by a tiny bit!!
461 offset_arr.push (Offset (0, dy_f_drul_[LEFT]));
462 offset_arr.push (Offset (0, dy_f_drul_[RIGHT]));
466 Offset origin (relative_coordinate (0, X_AXIS), 0);
469 int last = encompass_arr.size () - 2;
471 offset_arr.push (Offset (dx_f_drul_[LEFT], dy_f_drul_[LEFT]));
477 int cross_count = cross_staff_count ();
478 bool cross_b = cross_count && cross_count < encompass_arr.size ();
479 if (encompass_arr[0] != spanned_drul_[LEFT])
482 Real is = calc_interstaff_dist (encompass_arr[0], this);
484 offset_arr[0][Y_AXIS] += is;
490 if (encompass_arr.top () != spanned_drul_[RIGHT])
495 for (int i = first; i <= last; i++)
497 Offset o (encompass_offset (encompass_arr[i]));
498 offset_arr.push (o - origin);
501 offset_arr.push (Offset (spanner_length ()+ dx_f_drul_[RIGHT],
509 Slur::get_rods () const
513 r.item_l_drul_ = spanned_drul_;
514 r.distance_f_ = paper_l ()->get_var ("slur_x_minimum");