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 "group-interface.hh"
19 #include "paper-def.hh"
20 #include "note-column.hh"
22 #include "paper-column.hh"
23 #include "molecule.hh"
28 #include "cross-staff.hh"
29 #include "group-interface.hh"
33 set_elt_property ("note-columns", SCM_EOL);
37 Slur::add_column (Note_column*n)
39 if (!gh_pair_p (n->get_elt_property ("note-heads")))
40 warning (_ ("Putting slur over rest. Ignoring."));
43 Group_interface gi (this, "note-columns");
50 Slur::get_default_dir () const
52 Link_array<Note_column> encompass_arr =
53 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
56 for (int i=0; i < encompass_arr.size (); i ++)
58 if (encompass_arr[i]->dir () < 0)
68 Slur::do_add_processing ()
70 Link_array<Note_column> encompass_arr =
71 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
72 set_bounds (LEFT, encompass_arr[0]);
73 if (encompass_arr.size () > 1)
74 set_bounds (RIGHT, encompass_arr.top ());
78 Slur::do_pre_processing ()
80 // don't set directions
85 Slur::encompass_offset (Note_column const* col) const
88 Stem* stem_l = col->stem_l ();
91 warning (_ ("Slur over rest?"));
92 o[X_AXIS] = col->hpos_f ();
93 o[Y_AXIS] = col->extent (Y_AXIS)[get_direction ()];
97 o[X_AXIS] = stem_l->hpos_f ();
100 Simply set x to middle of notehead
103 o[X_AXIS] -= 0.5 * stem_l->get_direction () * col->extent (X_AXIS).length ();
105 if ((stem_l->get_direction () == get_direction ())
106 && !stem_l->extent (Y_AXIS).empty_b ())
108 o[Y_AXIS] = stem_l->extent (Y_AXIS)[get_direction ()];
112 o[Y_AXIS] = col->extent (Y_AXIS)[get_direction ()];
116 leave a gap: slur mustn't touch head/stem
118 o[Y_AXIS] += get_direction () * paper_l ()->get_var ("slur_y_free");
119 o[Y_AXIS] += calc_interstaff_dist (stem_l, this);
129 Slur::do_post_processing ()
131 Link_array<Note_column> encompass_arr =
132 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
135 if (!get_direction ())
136 set_direction (get_default_dir ());
139 Slur and tie placement [OSU]
142 * x = centre of head - d * x_gap_f
145 * y = length < 5ss : horizontal tangent + d * 0.25 ss
146 y = length >= 5ss : y next interline - d * 0.25 ss
149 Real interline_f = paper_l ()->get_var ("interline");
150 Real internote_f = interline_f / 2;
152 Real x_gap_f = paper_l ()->get_var ("slur_x_gap");
153 Real y_gap_f = paper_l ()->get_var ("slur_y_gap");
155 Drul_array<Note_column*> note_column_drul;
156 note_column_drul[LEFT] = encompass_arr[0];
157 note_column_drul[RIGHT] = encompass_arr.top ();
159 bool fix_broken_b = false;
166 if ((note_column_drul[d] == spanned_drul_[d])
167 && note_column_drul[d]->first_head ()
168 && (note_column_drul[d]->stem_l ()))
170 Stem* stem_l = note_column_drul[d]->stem_l ();
172 side directly attached to note head;
173 no beam getting in the way
175 if ((stem_l->extent (Y_AXIS).empty_b ()
176 || !((stem_l->get_direction () == get_direction ()) && (get_direction () != d)))
177 && !((get_direction () == stem_l->get_direction ())
178 && stem_l->beam_l () && (stem_l->beam_count (-d) >= 1)))
180 dx_f_drul_[d] = spanned_drul_[d]->extent (X_AXIS).length () / 2;
181 dx_f_drul_[d] -= d * x_gap_f;
183 if (stem_l->get_direction () != get_direction ())
185 dy_f_drul_[d] = note_column_drul[d]->extent (Y_AXIS)[get_direction ()];
189 dy_f_drul_[d] = stem_l->chord_start_f ()
190 + get_direction () * internote_f;
192 dy_f_drul_[d] += get_direction () * y_gap_f;
195 side attached to (visible) stem
199 dx_f_drul_[d] = stem_l->hpos_f ()
200 - spanned_drul_[d]->relative_coordinate (0, X_AXIS);
202 side attached to beamed stem
204 if (stem_l->beam_l () && (stem_l->beam_count (-d) >= 1))
206 dy_f_drul_[d] = stem_l->extent (Y_AXIS)[get_direction ()];
207 dy_f_drul_[d] += get_direction () * 2 * y_gap_f;
210 side attached to notehead, with stem getting in the way
214 dx_f_drul_[d] -= d * x_gap_f;
216 dy_f_drul_[d] = stem_l->chord_start_f ()
217 + get_direction () * internote_f;
218 dy_f_drul_[d] += get_direction () * y_gap_f;
227 dx_f_drul_[d] = get_broken_left_end_align ();
230 broken: should get y from other piece, so that slur
231 continues up/down trend
233 for now: be horizontal..
238 while (flip (&d) != LEFT);
240 int cross_count = cross_staff_count ();
241 bool interstaff_b = (0 < cross_count) && (cross_count < encompass_arr.size ());
243 Drul_array<Offset> info_drul;
244 Drul_array<Real> interstaff_interval;
248 info_drul[d] = encompass_offset (encompass_arr.boundary (d, 0));
249 interstaff_interval[d] = calc_interstaff_dist (encompass_arr.boundary (d,0),
252 while (flip (&d) != LEFT);
254 Real interstaff_f = interstaff_interval[RIGHT] - interstaff_interval[LEFT];
258 Direction d = (encompass_arr.top () != spanned_drul_[RIGHT]) ?
260 dy_f_drul_[d] = info_drul[d][Y_AXIS];
263 dy_f_drul_[d] -= interstaff_interval[d];
264 if (cross_count) // interstaff_i ?
266 dy_f_drul_[LEFT] += interstaff_interval[d];
267 dy_f_drul_[RIGHT] += interstaff_interval[d];
274 Now we've got a fine slur
275 Catch and correct some ugly cases
277 String infix = interstaff_b ? "interstaff_" : "";
278 Real height_damp_f = paper_l ()->get_var ("slur_"+infix +"height_damping");
279 Real slope_damp_f = paper_l ()->get_var ("slur_"+infix +"slope_damping");
280 Real snap_f = paper_l ()->get_var ("slur_"+infix +"snap_to_stem");
281 Real snap_max_dy_f = paper_l ()->get_var ("slur_"+infix +"snap_max_slope_change");
284 dy_f_drul_[RIGHT] += interstaff_f;
286 Real dy_f = dy_f_drul_[RIGHT] - dy_f_drul_[LEFT];
288 dy_f -= interstaff_f;
289 Real dx_f = spanner_length ()+ dx_f_drul_[RIGHT] - dx_f_drul_[LEFT];
292 Avoid too steep slurs.
294 Real slope_ratio_f = abs (dy_f / dx_f);
295 if (slope_ratio_f > slope_damp_f)
297 Direction d = (Direction)(- get_direction () * (sign (dy_f)));
300 Real damp_f = (slope_ratio_f - slope_damp_f) * dx_f;
302 must never change sign of dy
304 damp_f = damp_f <? abs (dy_f);
305 dy_f_drul_[d] += get_direction () * damp_f;
311 Wierd slurs may look a lot better after they have been
313 So, we'll do this in 3 steps
315 for (int i = 0; i < 3; i++)
317 Real height_f = curve_extent (Y_AXIS).length ();
318 Real width_f = curve_extent (X_AXIS).length ();
320 dy_f = dy_f_drul_[RIGHT] - dy_f_drul_[LEFT];
322 dy_f -= interstaff_f;
324 Real height_ratio_f = abs (height_f / width_f);
325 if (height_ratio_f > height_damp_f)
327 Direction d = (Direction)(- get_direction () * (sign (dy_f)));
330 /* take third step */
331 Real damp_f = (height_ratio_f - height_damp_f) * width_f / 3;
333 if y positions at about the same height, correct both ends
335 if (abs (dy_f / dx_f ) < slope_damp_f)
337 dy_f_drul_[-d] += get_direction () * damp_f;
338 dy_f_drul_[d] += get_direction () * damp_f;
341 don't change slope too much, would have been catched by slope damping
345 damp_f = damp_f <? abs (dy_f/2);
346 dy_f_drul_[d] += get_direction () * damp_f;
352 If, after correcting, we're close to stem-end...
354 Drul_array<Real> snapy_f_drul;
355 snapy_f_drul[LEFT] = snapy_f_drul[RIGHT] = 0;
356 Drul_array<Real> snapx_f_drul;
357 snapx_f_drul[LEFT] = snapx_f_drul[RIGHT] = 0;
358 Drul_array<bool> snapped_b_drul;
359 snapped_b_drul[LEFT] = snapped_b_drul[RIGHT] = false;
362 Note_column * nc = note_column_drul[d];
363 if (nc == spanned_drul_[d]
365 && nc->stem_l ()->get_direction () == get_direction ()
366 && abs (nc->stem_l ()->extent (Y_AXIS)[get_direction ()]
367 - dy_f_drul_[d] + (d == LEFT ? 0 : interstaff_f))
371 prepare to attach to stem-end
373 snapx_f_drul[d] = nc->stem_l ()->hpos_f ()
374 - spanned_drul_[d]->relative_coordinate (0, X_AXIS);
376 snapy_f_drul[d] = nc->stem_l ()->extent (Y_AXIS)[get_direction ()]
377 + interstaff_interval[d]
378 + get_direction () * 2 * y_gap_f;
380 snapped_b_drul[d] = true;
383 while (flip (&d) != LEFT);
386 only use snapped positions if sign (dy) will not change
387 and dy doesn't change too much
390 dy_f += interstaff_f;
396 More refactoring could be done.
398 Real maxsnap = abs (dy_f * snap_max_dy_f);
399 if (snapped_b_drul[LEFT] && snapped_b_drul[RIGHT]
400 && ((sign (snapy_f_drul[RIGHT] - snapy_f_drul[LEFT]) == sign (dy_f)))
401 && (!dy_f || (abs (snapy_f_drul[RIGHT] - snapy_f_drul[LEFT] - dy_f)
404 dy_f_drul_ = snapy_f_drul;
405 dx_f_drul_ = snapx_f_drul;
410 Direction od = (Direction)-d;
411 if (snapped_b_drul[d]
412 && d * sign (snapy_f_drul[d] - dy_f_drul_[od]) == sign (dy_f)
413 && (!dy_f || (abs (snapy_f_drul[d] - dy_f_drul_[od] - d * dy_f)
416 dy_f_drul_[d] = snapy_f_drul[d];
417 dx_f_drul_[d] = snapx_f_drul[d];
420 while (flip (&d) != LEFT);
425 Slur::cross_staff_count ()const
427 Link_array<Note_column> encompass_arr =
428 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
432 for (int i = 0; i < encompass_arr.size (); i++)
434 if (calc_interstaff_dist (encompass_arr[i], this))
442 Slur::get_encompass_offset_arr () const
444 Link_array<Note_column> encompass_arr =
445 Group_interface__extract_elements (this, (Note_column*)0, "note-columns");
447 Array<Offset> offset_arr;
450 check non-disturbed slur
451 FIXME: x of ends off by a tiny bit!!
453 offset_arr.push (Offset (0, dy_f_drul_[LEFT]));
454 offset_arr.push (Offset (0, dy_f_drul_[RIGHT]));
458 Offset origin (relative_coordinate (0, X_AXIS), 0);
461 int last = encompass_arr.size () - 2;
463 offset_arr.push (Offset (dx_f_drul_[LEFT], dy_f_drul_[LEFT]));
469 int cross_count = cross_staff_count ();
470 bool cross_b = cross_count && cross_count < encompass_arr.size ();
471 if (encompass_arr[0] != spanned_drul_[LEFT])
474 Real is = calc_interstaff_dist (encompass_arr[0], this);
476 offset_arr[0][Y_AXIS] += is;
482 if (encompass_arr.top () != spanned_drul_[RIGHT])
487 for (int i = first; i <= last; i++)
489 Offset o (encompass_offset (encompass_arr[i]));
490 offset_arr.push (o - origin);
493 offset_arr.push (Offset (spanner_length ()+ dx_f_drul_[RIGHT],
501 Slur::get_rods () const
505 r.item_l_drul_ = spanned_drul_;
506 r.distance_f_ = paper_l ()->get_var ("slur_x_minimum");