2 slur.cc -- implement Slur
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
13 * should avoid stafflines with horizontal part.
15 * begin and end should be treated as a/acknowledge Scripts.
17 * smart changing of endings
19 * smart changing of (Y-?)offsets to avoid ugly beziers
24 #include "directional-element-interface.hh"
25 #include "group-interface.hh"
28 #include "paper-def.hh"
29 #include "note-column.hh"
31 #include "paper-column.hh"
32 #include "molecule.hh"
34 #include "slur-bezier-bow.hh"
36 #include "group-interface.hh"
37 #include "staff-symbol-referencer.hh"
42 Slur::set_interface (Grob*me)
44 /* Copy to mutable list. */
45 me->set_grob_property ("attachment",
46 ly_deep_copy (me->get_grob_property ("attachment")));
50 Slur::add_column (Grob*me, Grob*n)
52 Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-columns"), n);
53 me->add_dependency (n);
55 add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (n));
59 Slur::de_uglyfy (Grob*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_grob_property ("de-uglify-parameters");
72 Real c1 = gh_scm2double (ly_car (up));
73 Real c2 = gh_scm2double (ly_cadr (up));
74 Real c3 = gh_scm2double (ly_caddr (up));
80 else if (h > c2 + c3 * ind)
85 bb->curve_.control_[i][Y_AXIS] = h * length;
88 bb->curve_.assert_sanity ();
94 Slur::get_default_dir (Grob*me)
96 Link_array<Grob> encompasses =
97 Pointer_group_interface__extract_grobs (me, (Grob*)0, "note-columns");
100 for (int i=0; i < encompasses.size (); i ++)
102 if (Note_column::dir (encompasses[i]) < 0)
112 MAKE_SCHEME_CALLBACK (Slur, after_line_breaking,1);
114 Slur::after_line_breaking (SCM smob)
116 Grob *me = unsmob_grob (smob);
117 if (!scm_ilength (me->get_grob_property ("note-columns")))
120 return SCM_UNSPECIFIED;
122 set_extremities (me);
123 set_control_points (me);
124 return SCM_UNSPECIFIED;
129 Slur::check_slope (Grob *me)
133 Avoid too steep slurs.
135 SCM s = me->get_grob_property ("slope-limit");
138 Array<Offset> encompass = get_encompass_offsets (me);
139 Drul_array<Offset> attachment;
140 attachment[LEFT] = encompass[0];
141 attachment[RIGHT] = encompass.top ();
143 Real dx = attachment[RIGHT][X_AXIS] - attachment[LEFT][X_AXIS];
144 Real dy = attachment[RIGHT][Y_AXIS] - attachment[LEFT][Y_AXIS];
148 Real slope = slope = abs (dy / dx);
150 Real limit = gh_scm2double (s);
154 Real staff_space = Staff_symbol_referencer::staff_space ((Grob*)me);
155 Direction dir = (Direction)gh_scm2int (me->get_grob_property ("direction"));
156 Direction d = (Direction) (- dir * (sign (dy)));
157 SCM a = me->get_grob_property ("attachment-offset");
158 Drul_array<Offset> o;
159 o[LEFT] = ly_scm2offset (index_get_cell (a, LEFT));
160 o[RIGHT] = ly_scm2offset (index_get_cell (a, RIGHT));
161 o[d][Y_AXIS] -= (limit - slope) * dx * dir / staff_space;
163 o[d][Y_AXIS] *= Directional_element_interface::get (me);
165 me->set_grob_property ("attachment-offset",
166 gh_cons (ly_offset2scm (o[LEFT]),
167 ly_offset2scm (o[RIGHT])));
174 Set 'attachment grob property, and return it.
177 Slur::set_extremities (Grob *me)
179 if (!Directional_element_interface::get (me))
180 Directional_element_interface::set (me, get_default_dir (me));
182 SCM att = me->get_grob_property ("attachment");
185 if (!gh_pair_p (att))
187 programming_error ("attachment is not a cons?!");
188 att = gh_cons (SCM_EOL, SCM_EOL);
189 me->set_grob_property ("attachment", att);
192 Direction dir = LEFT;
196 if (!gh_symbol_p (index_get_cell (att, dir)))
198 for (SCM s = me->get_grob_property ("extremity-rules");
199 s != SCM_EOL; s = ly_cdr (s))
201 SCM r = gh_call2 (ly_caar (s), me->self_scm (),
202 gh_int2scm ((int)dir));
205 index_set_cell (att, dir,
212 while (flip (&dir) != LEFT);
221 Slur::get_first_notecolumn_y (Grob *me, Direction dir)
223 SCM cols = me->get_grob_property ("note-columns");
225 if(!gh_pair_p (cols))
227 programming_error ("No note-columns in slur?");
233 cols = scm_reverse(cols);
235 Grob *col = unsmob_grob (ly_car (cols));
239 me->common_refpoint (col, Y_AXIS)
242 if (col == ((Spanner*)me)->get_bound (dir))
244 y = get_attachment (me, dir, common)[Y_AXIS];
248 y = encompass_offset (me, col, common)[Y_AXIS]
249 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
255 Slur::broken_trend_offset (Grob *me, Direction dir)
258 A broken slur should maintain the same vertical trend
259 the unbroken slur would have had.
262 if (Spanner *mother = dynamic_cast<Spanner*> (me->original_))
264 for (int i = dir == LEFT ? 0 : mother->broken_intos_.size () - 1;
265 dir == LEFT ? i < mother->broken_intos_.size () : i > 0;
266 dir == LEFT ? i++ : i--)
268 if (mother->broken_intos_[i - dir] == me)
270 Grob *neighbour = mother->broken_intos_[i];
272 neighbour->set_grob_property ("direction",
273 me->get_grob_property ("direction"));
274 Real neighbour_y = get_first_notecolumn_y (neighbour, dir);
275 Real y = get_first_notecolumn_y (me, -dir);
276 int neighbour_cols = scm_ilength (neighbour->get_grob_property ("note-columns"));
277 int cols = scm_ilength (me->get_grob_property ("note-columns"));
278 o = Offset (0, (y*neighbour_cols + neighbour_y*cols) /
279 (cols + neighbour_cols));
288 COMMON is size-2 array with common refpoints.
290 UGH: this routine delivers offsets which are *not* relative to COMMON.
293 Slur::get_attachment (Grob *me, Direction dir,
296 SCM s = me->get_grob_property ("attachment");
297 if (!gh_symbol_p (index_get_cell (s, dir)))
299 s = set_extremities (me);
302 SCM a = dir == LEFT ? ly_car (s) : ly_cdr (s);
303 Spanner*sp = dynamic_cast<Spanner*> (me);
304 String str = ly_symbol2string (a);
305 Real staff_space = Staff_symbol_referencer::staff_space ((Grob*)me);
306 Real hs = staff_space / 2.0;
309 int slurdir = gh_scm2int (me->get_grob_property ("direction"));
312 if (Note_column::has_interface (sp->get_bound (dir)))
314 Grob * n =sp->get_bound (dir);
315 if ((stem = Note_column::get_stem (n)))
318 if (Grob *head = Note_column::first_head (n))
319 x_extent = head->extent (head, X_AXIS).length ();
321 x_extent = n->extent (n, X_AXIS).length ();
325 o = Offset (0, Stem::head_positions (stem)
326 [Directional_element_interface::get (me)] * hs);
328 Default position is centered in X, on outer side of head Y
330 o += Offset (0.5 * x_extent,
332 * Directional_element_interface::get (me));
334 else if (str == "alongside-stem")
336 o = Offset (0, Stem::chord_start_y (stem));
338 Default position is on stem X, on outer side of head Y
340 o += Offset (x_extent * (1 + Stem::get_direction (stem)),
342 * Directional_element_interface::get (me));
344 else if (str == "stem")
346 o = Offset (0, Stem::stem_end_position (stem) * hs);
348 Default position is on stem X, at stem end Y
350 Real stem_thickness =
351 gh_scm2double (stem->get_grob_property ("thickness"))
352 * stem->get_paper ()->get_var ("linethickness");
354 x_extent * (1 + Stem::get_direction (stem))
355 - ((dir + 1)/2) * stem_thickness
356 + ((1 - slurdir)/2) * stem_thickness,
362 If we're not a note_column, we can't be anything but a loose-end.
363 But if user has set (attachment . (stem . stem)), our string is
366 Hmm, maybe after-line-breaking should set this to loose-end? */
367 else // if (str == "loose-end")
369 SCM other_a = dir == LEFT ? ly_cdr (s) : ly_car (s);
370 if (ly_symbol2string (other_a) != "loose-end")
371 o = broken_trend_offset (me, dir);
374 SCM alist = me->get_grob_property ("extremity-offset-alist");
375 int stemdir = stem ? Stem::get_direction (stem) : 1;
378 gh_int2scm (stemdir * dir),
379 gh_int2scm (slurdir * dir),
380 SCM_UNDEFINED), alist);
384 Offset off = ly_scm2offset (ly_cdr (l)) * staff_space;
386 off[Y_AXIS] *= Directional_element_interface::get (me);
391 What if get_bound () is not a note-column?
393 if (str != "loose-end"
394 && sp->get_bound (dir)->common_refpoint (common[Y_AXIS], Y_AXIS) == common[Y_AXIS])
396 o[Y_AXIS] += sp->get_bound (dir)->relative_coordinate (common[Y_AXIS], Y_AXIS)
397 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
400 Offset off = ly_scm2offset (index_get_cell (me->get_grob_property
401 ("attachment-offset"),
404 off[Y_AXIS] *= Directional_element_interface::get (me);
410 Slur::encompass_offset (Grob*me,
415 Grob* stem = unsmob_grob (col->get_grob_property ("stem"));
417 Direction dir = Directional_element_interface::get (me);
421 programming_error ("No stem for note column?");
422 o[X_AXIS] = col->relative_coordinate (common[X_AXIS], X_AXIS);
423 o[Y_AXIS] = col->relative_coordinate (common[Y_AXIS], Y_AXIS);
426 Direction stem_dir = Directional_element_interface::get (stem);
427 o[X_AXIS] = stem->relative_coordinate (0, X_AXIS);
430 Simply set x to middle of notehead
433 if (Grob *head = Note_column::first_head (col))
434 x_extent = head->extent (head, X_AXIS).length ();
436 x_extent = col->extent (col, X_AXIS).length ();
437 o[X_AXIS] -= 0.5 * stem_dir * x_extent;
439 if ((stem_dir == dir)
440 && !stem->extent (stem, Y_AXIS).empty_b ())
442 o[Y_AXIS] = stem->extent (common[Y_AXIS], Y_AXIS)[dir];
446 o[Y_AXIS] = col->extent (common[Y_AXIS], Y_AXIS)[dir];
450 leave a gap: slur mustn't touch head/stem
452 o[Y_AXIS] += dir * gh_scm2double (me->get_grob_property ("y-free")) *
458 Slur::get_encompass_offsets (Grob *me)
460 Spanner*sp = dynamic_cast<Spanner*> (me);
461 SCM eltlist = me->get_grob_property ("note-columns");
462 Grob *common[] = {common_refpoint_of_list (eltlist, me, X_AXIS),
463 common_refpoint_of_list (eltlist, me, Y_AXIS)};
466 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
467 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (LEFT), X_AXIS);
469 Link_array<Grob> encompasses = ly_scm2grobs (eltlist);
470 Array<Offset> offsets;
472 Offset origin (me->relative_coordinate (common[X_AXIS], X_AXIS),
473 me->relative_coordinate (common[Y_AXIS], Y_AXIS));
476 int last = encompasses.size () - 2;
478 offsets.push (get_attachment (me, LEFT, common));
483 if (encompasses[0] != sp->get_bound (LEFT))
488 offsets[0][Y_AXIS] -=
489 encompasses[0]->relative_coordinate (common[Y_AXIS], Y_AXIS)
490 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
496 if (encompasses.top () != sp->get_bound (RIGHT))
501 for (int i = first; i <= last; i++)
503 Offset o (encompass_offset (me, encompasses[i], common));
504 offsets.push (o - origin);
507 offsets.push (Offset (sp->spanner_length (), 0) + get_attachment (me, RIGHT,common));
509 if (encompasses[0] != sp->get_bound (LEFT))
511 offsets.top ()[Y_AXIS] -= encompasses.top ()->relative_coordinate (common[Y_AXIS], Y_AXIS)
512 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
524 MAKE_SCHEME_CALLBACK (Slur, height, 2);
526 Slur::height (SCM smob, SCM ax)
528 Axis a = (Axis)gh_scm2int (ax);
529 Grob * me = unsmob_grob (smob);
530 assert (a == Y_AXIS);
532 SCM mol = me->get_uncached_molecule ();
533 return ly_interval2scm (unsmob_molecule (mol)->extent (a));
537 Ugh should have dash-length + dash-period
539 MAKE_SCHEME_CALLBACK (Slur, brew_molecule,1);
541 Slur::brew_molecule (SCM smob)
543 Grob * me = unsmob_grob (smob);
544 if (!scm_ilength (me->get_grob_property ("note-columns")))
550 Real thick = me->get_paper ()->get_var ("linethickness") *
551 gh_scm2double (me->get_grob_property ("thickness"));
552 Bezier one = get_curve (me);
554 // get_curve may suicide
555 if (!scm_ilength (me->get_grob_property ("note-columns")))
559 SCM d = me->get_grob_property ("dashed");
561 a = Lookup::dashed_slur (one, thick, thick * gh_scm2double (d));
563 a = Lookup::slur (one, Directional_element_interface::get (me) * thick, thick);
565 return a.smobbed_copy ();
569 Slur::set_control_points (Grob*me)
571 Real staff_space = Staff_symbol_referencer::staff_space ((Grob*)me);
573 SCM details = me->get_grob_property ("details");
574 SCM h_inf_scm = me->get_grob_property ("height-limit");
575 SCM r_0_scm = me->get_grob_property ("ratio");
577 Real r_0 = gh_scm2double (r_0_scm);
578 Real h_inf = staff_space * gh_scm2double (h_inf_scm);
580 Slur_bezier_bow bb (get_encompass_offsets (me),
581 Directional_element_interface::get (me),
585 if (bb.fit_factor () > 1.0)
587 Real length = bb.curve_.control_[3][X_AXIS];
588 Real default_height = slur_height (length, h_inf, r_0);
590 SCM ssb = me->get_grob_property ("beautiful");
592 if (gh_number_p (ssb))
593 sb = gh_scm2double (ssb);
595 bb.minimise_enclosed_area (sb, details);
596 SCM sbf = scm_assq (ly_symbol2scm ("force-blowfit"), details);
598 if (gh_pair_p (sbf) && gh_number_p (ly_cdr (sbf)))
599 bff = gh_scm2double (ly_cdr (sbf));
601 bb.curve_.control_[1][Y_AXIS] *= bff;
602 bb.curve_.control_[2][Y_AXIS] *= bff;
606 Real beautiful = length * default_height * sb;
607 Real area = bb.get_enclosed_area ();
610 Slurs that fit beautifully are not ugly
612 if (area > beautiful)
613 de_uglyfy (me, &bb, default_height);
616 Bezier b = bb.get_bezier ();
619 SCM controls = SCM_EOL;
622 controls = gh_cons (ly_offset2scm (b.control_[i]), controls);
625 All these null control-points, where do they all come from?
627 if (i && b.control_[i][X_AXIS] == 0)
634 me->set_grob_property ("control-points", controls);
638 Slur::get_curve (Grob*me)
643 SCM attach = me->get_grob_property ("attachment");
644 if (!gh_pair_p (attach))
645 attach = set_extremities(me);
648 if (!Directional_element_interface::get (me)
649 || ! gh_symbol_p (index_get_cell (attach, LEFT))
650 || ! gh_symbol_p (index_get_cell (attach, RIGHT)))
651 set_extremities (me);
653 if (!gh_pair_p (me->get_grob_property ("control-points")))
654 set_control_points (me);
656 // set_control_points may suicide
657 if (!scm_ilength (me->get_grob_property ("note-columns")))
660 for (SCM s= me->get_grob_property ("control-points"); s != SCM_EOL; s = ly_cdr (s))
662 b.control_[i] = ly_scm2offset (ly_car (s));
666 Array<Offset> enc (get_encompass_offsets (me));
667 Direction dir = Directional_element_interface::get (me);
669 Real x1 = enc[0][X_AXIS];
670 Real x2 = enc.top ()[X_AXIS];
673 for (int i=1; i < enc.size ()-1; i++)
675 Real x = enc[i][X_AXIS];
678 Real y = b.get_other_coordinate (X_AXIS, x);
679 off = off >? dir * (enc[i][Y_AXIS] - y);
682 b.translate (Offset (0, dir * off));
689 ADD_INTERFACE (Slur,"slur-interface",
691 "attachment attachment-offset beautiful control-points dashed details de-uglify-parameters direction extremity-rules extremity-offset-alist height-limit ratio slope-limit thickness y-free");