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 Real c1 = me->paper_l ()->get_var ("bezier_control1");
71 Real c2 = me->paper_l ()->get_var ("bezier_control2");
72 Real c3 = me->paper_l ()->get_var ("bezier_control3");
77 else if (h > c2 + c3 * ind)
82 bb->curve_.control_[i][Y_AXIS] = h * length;
85 bb->curve_.assert_sanity ();
89 Slur::get_default_dir (Score_element*me)
91 Link_array<Score_element> encompass_arr =
92 Pointer_group_interface__extract_elements (me, (Score_element*)0, "note-columns");
95 for (int i=0; i < encompass_arr.size (); i ++)
97 if (Note_column::dir (encompass_arr[i]) < 0)
111 Slur::encompass_offset (Score_element*me,
113 Score_element **common)
116 Score_element* stem_l = unsmob_element (col->get_elt_property ("stem"));
118 Direction dir = Directional_element_interface (me).get ();
122 warning (_ ("Slur over rest?"));
123 o[X_AXIS] = col->relative_coordinate (common[X_AXIS], X_AXIS);
124 o[Y_AXIS] = col->relative_coordinate (common[Y_AXIS], Y_AXIS);
127 Direction stem_dir = Directional_element_interface (stem_l).get ();
128 o[X_AXIS] = stem_l->relative_coordinate (0, X_AXIS);
131 Simply set x to middle of notehead
134 o[X_AXIS] -= 0.5 * stem_dir * col->extent (X_AXIS).length ();
136 if ((stem_dir == dir)
137 && !stem_l->extent (Y_AXIS).empty_b ())
139 o[Y_AXIS] = stem_l->relative_coordinate (common[Y_AXIS], Y_AXIS); // iuhg
143 o[Y_AXIS] = col->relative_coordinate (common[Y_AXIS], Y_AXIS); // ugh
147 leave a gap: slur mustn't touch head/stem
149 o[Y_AXIS] += dir * me->paper_l ()->get_var ("slur_y_free");
153 MAKE_SCHEME_CALLBACK (Slur, before_line_breaking);
155 Slur::before_line_breaking (SCM smob)
157 Score_element *me = unsmob_element (smob);
158 if (Pointer_group_interface__extract_elements (me, (Score_element*)0, "note-columns").size () < 2)
160 return SCM_UNSPECIFIED;
163 MAKE_SCHEME_CALLBACK(Slur,after_line_breaking);
165 Slur::after_line_breaking (SCM smob)
167 Score_element *me = unsmob_element (smob);
168 if (Pointer_group_interface__extract_elements (me, (Score_element*)0, "note-columns").size () < 2)
172 set_extremities (me);
173 set_control_points (me);
175 return SCM_UNSPECIFIED;
179 Slur::set_extremities (Score_element*me)
181 if (!Directional_element_interface (me).get ())
182 Directional_element_interface (me).set (get_default_dir (me));
184 Direction dir = LEFT;
187 if (!gh_symbol_p (index_cell (me->get_elt_property ("attachment"), dir)))
190 // for (SCM s = get_elt_property ("slur-extremity-rules"); s != SCM_EOL; s = gh_cdr (s))
191 for (SCM s = scm_eval (ly_symbol2scm ("slur-extremity-rules"));
192 s != SCM_EOL; s = gh_cdr (s))
194 SCM r = gh_call2 (gh_caar (s), me->self_scm (),
195 gh_int2scm ((int)dir));
198 index_set_cell (me->get_elt_property ("attachment"), dir,
205 while (flip (&dir) != LEFT);
209 Slur::get_attachment (Score_element*me,Direction dir,
210 Score_element **common)
212 Spanner*sp = dynamic_cast<Spanner*>(me);
213 SCM s = me->get_elt_property ("attachment");
214 SCM a = dir == LEFT ? gh_car (s) : gh_cdr (s);
215 String str = ly_symbol2string (a);
216 Real ss = Staff_symbol_referencer::staff_space ((Score_element*)me);
221 if (Note_column::has_interface (sp->get_bound (dir)))
223 Score_element * n =sp->get_bound (dir);
224 if (Score_element*st = Note_column::stem_l (n))
229 o = Offset (0, Stem::chord_start_f (st ));
231 Default position is centered in X, on outer side of head Y
233 o += Offset (0.5 * n->extent (X_AXIS).length (),
234 0.5 * ss * Directional_element_interface (me).get ());
236 else if (str == "alongside-stem")
238 o = Offset (0, Stem::chord_start_f (st ));
240 Default position is on stem X, on outer side of head Y
242 o += Offset (n->extent (X_AXIS).length ()
243 * (1 + Stem::get_direction (st )),
244 0.5 * ss * Directional_element_interface (me).get ());
246 else if (str == "stem")
248 o = Offset (0, Stem::stem_end_position (st ) * hs);
250 Default position is on stem X, at stem end Y
253 (n->extent (X_AXIS).length ()
254 - st->extent (X_AXIS).length ())
255 * (1 + Stem::get_direction (st )),
258 else if (str == "loose-end")
260 SCM other_a = dir == LEFT ? gh_cdr (s) : gh_car (s);
261 if (ly_symbol2string (other_a) != "loose-end")
263 o = Offset (0, get_attachment (me, -dir, common)[Y_AXIS]);
270 gh_int2scm (Stem::get_direction (st ) * dir),
271 gh_int2scm (Directional_element_interface (me).get () * dir),
273 scm_eval (ly_symbol2scm ("slur-extremity-offset-alist")));
277 o += ly_scm2offset (gh_cdr (l)) * ss * dir;
284 What if get_bound () is not a note-column?
286 if (str != "loose-end"
287 && sp->get_bound (dir)->common_refpoint (common[Y_AXIS], Y_AXIS) == common[Y_AXIS])
289 o[Y_AXIS] += sp->get_bound (dir)->relative_coordinate (common[Y_AXIS], Y_AXIS)
290 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
296 Slur::get_encompass_offset_arr (Score_element*me)
298 Spanner*sp = dynamic_cast<Spanner*>(me);
299 SCM eltlist = me->get_elt_property ("note-columns");
300 Score_element *common[] = {me->common_refpoint (eltlist,X_AXIS),
301 me->common_refpoint (eltlist,Y_AXIS)};
304 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
305 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (LEFT), X_AXIS);
307 Link_array<Score_element> encompass_arr;
308 while (gh_pair_p (eltlist))
310 encompass_arr.push (unsmob_element (gh_car (eltlist)));
311 eltlist =gh_cdr (eltlist);
313 encompass_arr.reverse ();
316 Array<Offset> offset_arr;
318 Offset origin (me->relative_coordinate (common[X_AXIS], X_AXIS),
319 me->relative_coordinate (common[Y_AXIS], Y_AXIS));
322 int last = encompass_arr.size () - 2;
324 offset_arr.push (get_attachment (me, LEFT, common));
330 if (encompass_arr[0] != sp->get_bound (LEFT))
335 offset_arr[0][Y_AXIS] -=
336 encompass_arr[0]->relative_coordinate (common[Y_AXIS], Y_AXIS)
337 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
343 if (encompass_arr.top () != sp->get_bound (RIGHT))
348 for (int i = first; i <= last; i++)
350 Offset o (encompass_offset (me, encompass_arr[i], common));
351 offset_arr.push (o - origin);
354 offset_arr.push (Offset (sp->spanner_length (), 0) + get_attachment (me, RIGHT,common));
356 if (encompass_arr[0] != sp->get_bound (LEFT))
358 offset_arr.top ()[Y_AXIS] -= encompass_arr.top ()->relative_coordinate (common[Y_AXIS], Y_AXIS)
359 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
366 MAKE_SCHEME_CALLBACK(Slur,set_spacing_rods);
368 Slur::set_spacing_rods (SCM smob)
370 Score_element*me = unsmob_element (smob);
373 Spanner*sp = dynamic_cast<Spanner*>(me);
374 r.item_l_drul_[LEFT] = sp->get_bound (LEFT);
375 r.item_l_drul_[RIGHT] = sp->get_bound (RIGHT);
377 gh_scm2double (me->get_elt_property ("minimum-length"))
378 * me->paper_l ()->get_var ("staffspace");
381 return SCM_UNSPECIFIED;
386 Ugh should have dash-length + dash-period
388 MAKE_SCHEME_CALLBACK(Slur,brew_molecule);
390 Slur::brew_molecule (SCM smob)
392 Score_element * me = unsmob_element (smob);
394 if (Pointer_group_interface__extract_elements (me, (Score_element*)0, "note-columns").size () < 2)
397 return a.create_scheme ();
399 Real thick = me->paper_l ()->get_var ("stafflinethickness") *
400 gh_scm2double (me->get_elt_property ("thickness"));
401 Bezier one = get_curve (me);
403 SCM d = me->get_elt_property ("dashed");
405 a = me->lookup_l ()->dashed_slur (one, thick, thick * gh_scm2double (d));
407 a = me->lookup_l ()->slur (one, Directional_element_interface (me).get () * thick, thick);
409 return a.create_scheme();
413 Slur::set_control_points (Score_element*me)
415 Real staff_space = Staff_symbol_referencer::staff_space ((Score_element*)me);
416 Real h_inf = me->paper_l ()->get_var ("slur_height_limit_factor") *
418 Real r_0 = me->paper_l ()->get_var ("slur_ratio");
420 Slur_bezier_bow bb (get_encompass_offset_arr (me),
421 Directional_element_interface (me).get (),
424 if (bb.fit_factor () > 1.0)
426 Real length = bb.curve_.control_[3][X_AXIS];
427 Real default_height = slur_height (length, h_inf, r_0);
428 bb.minimise_enclosed_area (me->paper_l());
430 Real bff = me->paper_l ()->get_var ("slur_force_blowfit");
431 bb.curve_.control_[1][Y_AXIS] *= bff;
432 bb.curve_.control_[2][Y_AXIS] *= bff;
435 Real sb = me->paper_l ()->get_var ("slur_beautiful");
436 Real beautiful = length * default_height * sb;
437 Real area = bb.enclosed_area_f ();
440 Slurs that fit beautifully are not ugly
442 if (area > beautiful)
443 de_uglyfy (me, &bb, default_height);
446 Bezier b = bb.get_bezier ();
449 SCM controls = SCM_EOL;
451 controls = gh_cons ( ly_offset2scm (b.control_[i]), controls);
453 me->set_elt_property ("control-points", controls);
458 Slur::get_curve (Score_element*me)
463 if (!Directional_element_interface (me).get ()
464 || ! gh_symbol_p (index_cell (me->get_elt_property ("attachment"), LEFT)))
465 set_extremities (me);
467 if (!gh_pair_p (me->get_elt_property ("control-points")))
468 set_control_points (me);
471 for (SCM s= me->get_elt_property ("control-points"); s != SCM_EOL; s = gh_cdr (s))
473 b.control_[i] = ly_scm2offset (gh_car (s));
477 Array<Offset> enc (get_encompass_offset_arr (me));
478 Direction dir = Directional_element_interface (me).get ();
480 Real x1 = enc[0][X_AXIS];
481 Real x2 = enc.top ()[X_AXIS];
484 for (int i=1; i < enc.size ()-1; i++)
486 Real x = enc[i][X_AXIS];
489 Real y = b.get_other_coordinate (X_AXIS, x);
490 off = off >? dir * (enc[i][Y_AXIS] - y);
493 b.translate (Offset (0, dir * off));
499 Slur::has_interface (Score_element*me)
501 return me->has_interface (ly_symbol2scm ("slur-interface"));