2 slur.cc -- implement Slur
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
12 * fix broken interstaff slurs
13 * begin and end should be treated as a/acknowledge Scripts.
14 * broken slur should have uniform trend
15 * smart changing of endings
16 * smart changing of (Y-?)offsets to avoid ugly beziers
20 #include "directional-element-interface.hh"
21 #include "group-interface.hh"
24 #include "paper-def.hh"
25 #include "note-column.hh"
27 #include "paper-column.hh"
28 #include "molecule.hh"
30 #include "slur-bezier-bow.hh"
32 #include "group-interface.hh"
33 #include "staff-symbol-referencer.hh"
38 Slur::set_interface (Score_element*me)
40 me->set_elt_property ("attachment", gh_cons (SCM_BOOL_F, SCM_BOOL_F));
41 me->set_interface (ly_symbol2scm ("slur-interface"));
45 Slur::add_column (Score_element*me, Score_element*n)
47 if (!gh_pair_p (n->get_elt_property ("note-heads")))
48 warning (_ ("Putting slur over rest. Ignoring."));
51 Pointer_group_interface (me, "note-columns").add_element (n);
52 me->add_dependency (n);
55 add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*>(n));
59 Slur::de_uglyfy (Score_element*me, Slur_bezier_bow* bb, Real default_height)
61 Real length = bb->curve_.control_[3][X_AXIS] ;
62 Real ff = bb->fit_factor ();
63 for (int i = 1; i < 3; i++)
65 Real ind = abs (bb->curve_.control_[(i-1)*3][X_AXIS]
66 - bb->curve_.control_[i][X_AXIS]) / length;
67 Real h = bb->curve_.control_[i][Y_AXIS] * ff / length;
69 Real f = default_height / length;
70 SCM up = me->get_elt_property ("de-uglify-parameters");
72 Real c1 = gh_scm2double (gh_car (up));
73 Real c2 = gh_scm2double (gh_cadr (up));
74 Real c3 = gh_scm2double (gh_caddr (up));
80 else if (h > c2 + c3 * ind)
85 bb->curve_.control_[i][Y_AXIS] = h * length;
88 bb->curve_.assert_sanity ();
92 Slur::get_default_dir (Score_element*me)
94 Link_array<Score_element> encompass_arr =
95 Pointer_group_interface__extract_elements (me, (Score_element*)0, "note-columns");
98 for (int i=0; i < encompass_arr.size (); i ++)
100 if (Note_column::dir (encompass_arr[i]) < 0)
110 MAKE_SCHEME_CALLBACK (Slur, after_line_breaking);
112 Slur::after_line_breaking (SCM smob)
114 Score_element *me = unsmob_element (smob);
115 if (!scm_ilength (me->get_elt_property ("note-columns")))
118 return SCM_UNSPECIFIED;
120 set_extremities (me);
121 set_control_points (me);
122 return SCM_UNSPECIFIED;
126 Slur::set_extremities (Score_element*me)
128 if (!Directional_element_interface::get (me))
129 Directional_element_interface ::set (me,get_default_dir (me));
131 Direction dir = LEFT;
134 if (!gh_symbol_p (index_cell (me->get_elt_property ("attachment"), dir)))
137 // for (SCM s = get_elt_property ("slur-extremity-rules"); s != SCM_EOL; s = gh_cdr (s))
138 for (SCM s = scm_eval2 (ly_symbol2scm ("slur-extremity-rules"),
140 s != SCM_EOL; s = gh_cdr (s))
142 SCM r = gh_call2 (gh_caar (s), me->self_scm (),
143 gh_int2scm ((int)dir));
146 index_set_cell (me->get_elt_property ("attachment"), dir,
153 while (flip (&dir) != LEFT);
157 Slur::get_first_notecolumn_y (Score_element *me, Direction dir)
159 Score_element *col = dir == LEFT
160 ? unsmob_element (gh_car (scm_reverse (me->get_elt_property
163 (gh_car (me->get_elt_property ("note-columns")));
165 Score_element *common[] =
168 me->common_refpoint (col, Y_AXIS)
171 if (col == ((Spanner*)me)->get_bound (dir))
173 y = get_attachment (me, dir, common)[Y_AXIS];
177 y = encompass_offset (me, col, common)[Y_AXIS]
178 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
184 Slur::broken_trend_offset (Score_element *me, Direction dir)
187 A broken slur should maintain the same vertical trend
188 the unbroken slur would have had.
191 if (Spanner *mother = dynamic_cast<Spanner*> (me->original_l_))
193 for (int i = dir == LEFT ? 0 : mother->broken_into_l_arr_.size ();
194 dir == LEFT ? i < mother->broken_into_l_arr_.size () : i;
195 dir == LEFT ? i++ : --i)
197 if (mother->broken_into_l_arr_[i - dir] == me)
199 Score_element *neighbour = mother->broken_into_l_arr_[i];
201 neighbour->set_elt_property ("direction",
202 me->get_elt_property ("direction"));
203 Real neighbour_y = get_first_notecolumn_y (neighbour, dir);
204 Real y = get_first_notecolumn_y (me, -dir);
205 o = Offset (0, (y + neighbour_y) / 2);
214 Slur::get_attachment (Score_element*me,Direction dir,
215 Score_element **common)
217 SCM s = me->get_elt_property ("attachment");
218 if (!gh_symbol_p (index_cell (s, dir)))
220 set_extremities (me);
221 s = me->get_elt_property ("attachment");
223 SCM a = dir == LEFT ? gh_car (s) : gh_cdr (s);
224 Spanner*sp = dynamic_cast<Spanner*>(me);
225 String str = ly_symbol2string (a);
226 Real ss = Staff_symbol_referencer::staff_space ((Score_element*)me);
230 Score_element *stem = 0;
231 if (Note_column::has_interface (sp->get_bound (dir)))
233 Score_element * n =sp->get_bound (dir);
234 if (Score_element *stem = Note_column::stem_l (n))
239 o = Offset (0, Stem::head_positions (stem)
240 [Directional_element_interface::get (me)] * hs);
242 Default position is centered in X, on outer side of head Y
244 o += Offset (0.5 * n->extent (X_AXIS).length (),
245 0.5 * ss * Directional_element_interface::get (me));
247 else if (str == "alongside-stem")
249 o = Offset (0, Stem::chord_start_f (stem));
251 Default position is on stem X, on outer side of head Y
253 o += Offset (n->extent (X_AXIS).length ()
254 * (1 + Stem::get_direction (stem)),
255 0.5 * ss * Directional_element_interface::get (me));
257 else if (str == "stem")
259 o = Offset (0, Stem::stem_end_position (stem) * hs);
261 Default position is on stem X, at stem end Y
264 (n->extent (X_AXIS).length ()
265 - stem->extent (X_AXIS).length ())
266 * (1 + Stem::get_direction (stem)),
271 else if (str == "loose-end")
273 SCM other_a = dir == LEFT ? gh_cdr (s) : gh_car (s);
274 if (ly_symbol2string (other_a) != "loose-end")
278 The braindead way: horizontal
280 o = Offset (0, get_attachment (me, -dir, common)[Y_AXIS]);
282 o = broken_trend_offset (me, dir);
292 gh_int2scm (stem ? Stem::get_direction (stem) : 1 * dir),
293 gh_int2scm (Directional_element_interface::get (me) * dir),
295 scm_eval2 (ly_symbol2scm ("slur-extremity-offset-alist"), SCM_EOL));
299 o += ly_scm2offset (gh_cdr (l)) * ss * dir;
303 What if get_bound () is not a note-column?
305 if (str != "loose-end"
306 && sp->get_bound (dir)->common_refpoint (common[Y_AXIS], Y_AXIS) == common[Y_AXIS])
308 o[Y_AXIS] += sp->get_bound (dir)->relative_coordinate (common[Y_AXIS], Y_AXIS)
309 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
316 Slur::encompass_offset (Score_element*me,
318 Score_element **common)
321 Score_element* stem_l = unsmob_element (col->get_elt_property ("stem"));
323 Direction dir = Directional_element_interface::get (me);
327 warning (_ ("Slur over rest?"));
328 o[X_AXIS] = col->relative_coordinate (common[X_AXIS], X_AXIS);
329 o[Y_AXIS] = col->relative_coordinate (common[Y_AXIS], Y_AXIS);
332 Direction stem_dir = Directional_element_interface::get (stem_l);
333 o[X_AXIS] = stem_l->relative_coordinate (0, X_AXIS);
336 Simply set x to middle of notehead
339 o[X_AXIS] -= 0.5 * stem_dir * col->extent (X_AXIS).length ();
341 if ((stem_dir == dir)
342 && !stem_l->extent (Y_AXIS).empty_b ())
344 o[Y_AXIS] = stem_l->relative_coordinate (common[Y_AXIS], Y_AXIS); // iuhg
345 o[Y_AXIS] += stem_l->extent (Y_AXIS)[dir];
349 o[Y_AXIS] = col->relative_coordinate (common[Y_AXIS], Y_AXIS); // ugh
350 o[Y_AXIS] += col->extent (Y_AXIS)[dir];
354 leave a gap: slur mustn't touch head/stem
356 o[Y_AXIS] += dir * me->paper_l ()->get_var ("slur_y_free");
361 Slur::get_encompass_offset_arr (Score_element*me)
363 Spanner*sp = dynamic_cast<Spanner*>(me);
364 SCM eltlist = me->get_elt_property ("note-columns");
365 Score_element *common[] = {me->common_refpoint (eltlist,X_AXIS),
366 me->common_refpoint (eltlist,Y_AXIS)};
369 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
370 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (LEFT), X_AXIS);
372 Link_array<Score_element> encompass_arr;
373 while (gh_pair_p (eltlist))
375 encompass_arr.push (unsmob_element (gh_car (eltlist)));
376 eltlist =gh_cdr (eltlist);
378 encompass_arr.reverse ();
381 Array<Offset> offset_arr;
383 Offset origin (me->relative_coordinate (common[X_AXIS], X_AXIS),
384 me->relative_coordinate (common[Y_AXIS], Y_AXIS));
387 int last = encompass_arr.size () - 2;
389 offset_arr.push (get_attachment (me, LEFT, common));
395 if (encompass_arr[0] != sp->get_bound (LEFT))
400 offset_arr[0][Y_AXIS] -=
401 encompass_arr[0]->relative_coordinate (common[Y_AXIS], Y_AXIS)
402 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
408 if (encompass_arr.top () != sp->get_bound (RIGHT))
413 for (int i = first; i <= last; i++)
415 Offset o (encompass_offset (me, encompass_arr[i], common));
416 offset_arr.push (o - origin);
419 offset_arr.push (Offset (sp->spanner_length (), 0) + get_attachment (me, RIGHT,common));
421 if (encompass_arr[0] != sp->get_bound (LEFT))
423 offset_arr.top ()[Y_AXIS] -= encompass_arr.top ()->relative_coordinate (common[Y_AXIS], Y_AXIS)
424 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
431 MAKE_SCHEME_CALLBACK(Slur,set_spacing_rods);
433 Slur::set_spacing_rods (SCM smob)
435 Score_element*me = unsmob_element (smob);
438 Spanner*sp = dynamic_cast<Spanner*>(me);
439 r.item_l_drul_[LEFT] = sp->get_bound (LEFT);
440 r.item_l_drul_[RIGHT] = sp->get_bound (RIGHT);
442 gh_scm2double (me->get_elt_property ("minimum-length"))
443 * me->paper_l ()->get_var ("staffspace");
446 return SCM_UNSPECIFIED;
451 Ugh should have dash-length + dash-period
453 MAKE_SCHEME_CALLBACK (Slur, brew_molecule);
455 Slur::brew_molecule (SCM smob)
457 Score_element * me = unsmob_element (smob);
458 if (!scm_ilength (me->get_elt_property ("note-columns")))
464 Real thick = me->paper_l ()->get_var ("stafflinethickness") *
465 gh_scm2double (me->get_elt_property ("thickness"));
466 Bezier one = get_curve (me);
469 SCM d = me->get_elt_property ("dashed");
471 a = me->lookup_l ()->dashed_slur (one, thick, thick * gh_scm2double (d));
473 a = me->lookup_l ()->slur (one, Directional_element_interface::get (me) * thick, thick);
475 return a.create_scheme();
479 Slur::set_control_points (Score_element*me)
481 Real staff_space = Staff_symbol_referencer::staff_space ((Score_element*)me);
482 Real h_inf = me->paper_l ()->get_var ("slur_height_limit_factor") *
484 Real r_0 = me->paper_l ()->get_var ("slur_ratio");
486 Slur_bezier_bow bb (get_encompass_offset_arr (me),
487 Directional_element_interface::get (me),
490 if (bb.fit_factor () > 1.0)
492 Real length = bb.curve_.control_[3][X_AXIS];
493 Real default_height = slur_height (length, h_inf, r_0);
494 bb.minimise_enclosed_area (me->paper_l());
496 Real bff = me->paper_l ()->get_var ("slur_force_blowfit");
497 bb.curve_.control_[1][Y_AXIS] *= bff;
498 bb.curve_.control_[2][Y_AXIS] *= bff;
501 Real sb = me->paper_l ()->get_var ("slur_beautiful");
502 Real beautiful = length * default_height * sb;
503 Real area = bb.enclosed_area_f ();
506 Slurs that fit beautifully are not ugly
508 if (area > beautiful)
509 de_uglyfy (me, &bb, default_height);
512 Bezier b = bb.get_bezier ();
515 SCM controls = SCM_EOL;
518 controls = gh_cons ( ly_offset2scm (b.control_[i]), controls);
521 All these null control-points, where do they all come from?
523 if (i && b.control_[i][X_AXIS] == 0)
527 me->set_elt_property ("control-points", controls);
531 Slur::get_curve (Score_element*me)
536 if (!Directional_element_interface::get (me)
537 || ! gh_symbol_p (index_cell (me->get_elt_property ("attachment"), LEFT)))
538 set_extremities (me);
540 if (!gh_pair_p (me->get_elt_property ("control-points")))
541 set_control_points (me);
543 for (SCM s= me->get_elt_property ("control-points"); s != SCM_EOL; s = gh_cdr (s))
545 b.control_[i] = ly_scm2offset (gh_car (s));
549 Array<Offset> enc (get_encompass_offset_arr (me));
550 Direction dir = Directional_element_interface::get (me);
552 Real x1 = enc[0][X_AXIS];
553 Real x2 = enc.top ()[X_AXIS];
556 for (int i=1; i < enc.size ()-1; i++)
558 Real x = enc[i][X_AXIS];
561 Real y = b.get_other_coordinate (X_AXIS, x);
562 off = off >? dir * (enc[i][Y_AXIS] - y);
565 b.translate (Offset (0, dir * off));
571 Slur::has_interface (Score_element*me)
573 return me->has_interface (ly_symbol2scm ("slur-interface"));