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, after_line_breaking);
155 Slur::after_line_breaking (SCM smob)
157 Score_element *me = unsmob_element (smob);
158 if (!gh_scm2int(scm_length (me->get_elt_property ("note-columns"))))
161 return SCM_UNSPECIFIED;
163 set_extremities (me);
164 set_control_points (me);
165 return SCM_UNSPECIFIED;
169 Slur::set_extremities (Score_element*me)
171 if (!Directional_element_interface (me).get ())
172 Directional_element_interface (me).set (get_default_dir (me));
174 Direction dir = LEFT;
177 if (!gh_symbol_p (index_cell (me->get_elt_property ("attachment"), dir)))
180 // for (SCM s = get_elt_property ("slur-extremity-rules"); s != SCM_EOL; s = gh_cdr (s))
181 for (SCM s = scm_eval (ly_symbol2scm ("slur-extremity-rules"));
182 s != SCM_EOL; s = gh_cdr (s))
184 SCM r = gh_call2 (gh_caar (s), me->self_scm (),
185 gh_int2scm ((int)dir));
188 index_set_cell (me->get_elt_property ("attachment"), dir,
195 while (flip (&dir) != LEFT);
199 Slur::get_attachment (Score_element*me,Direction dir,
200 Score_element **common)
202 Spanner*sp = dynamic_cast<Spanner*>(me);
203 SCM s = me->get_elt_property ("attachment");
204 SCM a = dir == LEFT ? gh_car (s) : gh_cdr (s);
205 String str = ly_symbol2string (a);
206 Real ss = Staff_symbol_referencer::staff_space ((Score_element*)me);
211 if (Note_column::has_interface (sp->get_bound (dir)))
213 Score_element * n =sp->get_bound (dir);
214 if (Score_element*st = Note_column::stem_l (n))
219 o = Offset (0, Stem::chord_start_f (st ));
221 Default position is centered in X, on outer side of head Y
223 o += Offset (0.5 * n->extent (X_AXIS).length (),
224 0.5 * ss * Directional_element_interface (me).get ());
226 else if (str == "alongside-stem")
228 o = Offset (0, Stem::chord_start_f (st ));
230 Default position is on stem X, on outer side of head Y
232 o += Offset (n->extent (X_AXIS).length ()
233 * (1 + Stem::get_direction (st )),
234 0.5 * ss * Directional_element_interface (me).get ());
236 else if (str == "stem")
238 o = Offset (0, Stem::stem_end_position (st ) * hs);
240 Default position is on stem X, at stem end Y
243 (n->extent (X_AXIS).length ()
244 - st->extent (X_AXIS).length ())
245 * (1 + Stem::get_direction (st )),
248 else if (str == "loose-end")
250 SCM other_a = dir == LEFT ? gh_cdr (s) : gh_car (s);
251 if (ly_symbol2string (other_a) != "loose-end")
253 o = Offset (0, get_attachment (me, -dir, common)[Y_AXIS]);
260 gh_int2scm (Stem::get_direction (st ) * dir),
261 gh_int2scm (Directional_element_interface (me).get () * dir),
263 scm_eval (ly_symbol2scm ("slur-extremity-offset-alist")));
267 o += ly_scm2offset (gh_cdr (l)) * ss * dir;
274 What if get_bound () is not a note-column?
276 if (str != "loose-end"
277 && sp->get_bound (dir)->common_refpoint (common[Y_AXIS], Y_AXIS) == common[Y_AXIS])
279 o[Y_AXIS] += sp->get_bound (dir)->relative_coordinate (common[Y_AXIS], Y_AXIS)
280 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
286 Slur::get_encompass_offset_arr (Score_element*me)
288 Spanner*sp = dynamic_cast<Spanner*>(me);
289 SCM eltlist = me->get_elt_property ("note-columns");
290 Score_element *common[] = {me->common_refpoint (eltlist,X_AXIS),
291 me->common_refpoint (eltlist,Y_AXIS)};
294 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
295 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (LEFT), X_AXIS);
297 Link_array<Score_element> encompass_arr;
298 while (gh_pair_p (eltlist))
300 encompass_arr.push (unsmob_element (gh_car (eltlist)));
301 eltlist =gh_cdr (eltlist);
303 encompass_arr.reverse ();
306 Array<Offset> offset_arr;
308 Offset origin (me->relative_coordinate (common[X_AXIS], X_AXIS),
309 me->relative_coordinate (common[Y_AXIS], Y_AXIS));
312 int last = encompass_arr.size () - 2;
314 offset_arr.push (get_attachment (me, LEFT, common));
320 if (encompass_arr[0] != sp->get_bound (LEFT))
325 offset_arr[0][Y_AXIS] -=
326 encompass_arr[0]->relative_coordinate (common[Y_AXIS], Y_AXIS)
327 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
333 if (encompass_arr.top () != sp->get_bound (RIGHT))
338 for (int i = first; i <= last; i++)
340 Offset o (encompass_offset (me, encompass_arr[i], common));
341 offset_arr.push (o - origin);
344 offset_arr.push (Offset (sp->spanner_length (), 0) + get_attachment (me, RIGHT,common));
346 if (encompass_arr[0] != sp->get_bound (LEFT))
348 offset_arr.top ()[Y_AXIS] -= encompass_arr.top ()->relative_coordinate (common[Y_AXIS], Y_AXIS)
349 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
356 MAKE_SCHEME_CALLBACK(Slur,set_spacing_rods);
358 Slur::set_spacing_rods (SCM smob)
360 Score_element*me = unsmob_element (smob);
363 Spanner*sp = dynamic_cast<Spanner*>(me);
364 r.item_l_drul_[LEFT] = sp->get_bound (LEFT);
365 r.item_l_drul_[RIGHT] = sp->get_bound (RIGHT);
367 gh_scm2double (me->get_elt_property ("minimum-length"))
368 * me->paper_l ()->get_var ("staffspace");
371 return SCM_UNSPECIFIED;
376 Ugh should have dash-length + dash-period
378 MAKE_SCHEME_CALLBACK (Slur, brew_molecule);
380 Slur::brew_molecule (SCM smob)
382 Score_element * me = unsmob_element (smob);
383 if (!gh_scm2int(scm_length (me->get_elt_property ("note-columns"))))
389 Real thick = me->paper_l ()->get_var ("stafflinethickness") *
390 gh_scm2double (me->get_elt_property ("thickness"));
391 Bezier one = get_curve (me);
394 SCM d = me->get_elt_property ("dashed");
396 a = me->lookup_l ()->dashed_slur (one, thick, thick * gh_scm2double (d));
398 a = me->lookup_l ()->slur (one, Directional_element_interface (me).get () * thick, thick);
400 return a.create_scheme();
404 Slur::set_control_points (Score_element*me)
406 Real staff_space = Staff_symbol_referencer::staff_space ((Score_element*)me);
407 Real h_inf = me->paper_l ()->get_var ("slur_height_limit_factor") *
409 Real r_0 = me->paper_l ()->get_var ("slur_ratio");
411 Slur_bezier_bow bb (get_encompass_offset_arr (me),
412 Directional_element_interface (me).get (),
415 if (bb.fit_factor () > 1.0)
417 Real length = bb.curve_.control_[3][X_AXIS];
418 Real default_height = slur_height (length, h_inf, r_0);
419 bb.minimise_enclosed_area (me->paper_l());
421 Real bff = me->paper_l ()->get_var ("slur_force_blowfit");
422 bb.curve_.control_[1][Y_AXIS] *= bff;
423 bb.curve_.control_[2][Y_AXIS] *= bff;
426 Real sb = me->paper_l ()->get_var ("slur_beautiful");
427 Real beautiful = length * default_height * sb;
428 Real area = bb.enclosed_area_f ();
431 Slurs that fit beautifully are not ugly
433 if (area > beautiful)
434 de_uglyfy (me, &bb, default_height);
437 Bezier b = bb.get_bezier ();
440 SCM controls = SCM_EOL;
442 controls = gh_cons ( ly_offset2scm (b.control_[i]), controls);
444 me->set_elt_property ("control-points", controls);
449 Slur::get_curve (Score_element*me)
454 if (!Directional_element_interface (me).get ()
455 || ! gh_symbol_p (index_cell (me->get_elt_property ("attachment"), LEFT)))
456 set_extremities (me);
458 if (!gh_pair_p (me->get_elt_property ("control-points")))
459 set_control_points (me);
462 for (SCM s= me->get_elt_property ("control-points"); s != SCM_EOL; s = gh_cdr (s))
464 b.control_[i] = ly_scm2offset (gh_car (s));
468 Array<Offset> enc (get_encompass_offset_arr (me));
469 Direction dir = Directional_element_interface (me).get ();
471 Real x1 = enc[0][X_AXIS];
472 Real x2 = enc.top ()[X_AXIS];
475 for (int i=1; i < enc.size ()-1; i++)
477 Real x = enc[i][X_AXIS];
480 Real y = b.get_other_coordinate (X_AXIS, x);
481 off = off >? dir * (enc[i][Y_AXIS] - y);
484 b.translate (Offset (0, dir * off));
490 Slur::has_interface (Score_element*me)
492 return me->has_interface (ly_symbol2scm ("slur-interface"));