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
140 o[Y_AXIS] += stem_l->extent (Y_AXIS)[dir];
144 o[Y_AXIS] = col->relative_coordinate (common[Y_AXIS], Y_AXIS); // ugh
145 o[Y_AXIS] += col->extent (Y_AXIS)[dir];
149 leave a gap: slur mustn't touch head/stem
151 o[Y_AXIS] += dir * me->paper_l ()->get_var ("slur_y_free");
155 MAKE_SCHEME_CALLBACK (Slur, after_line_breaking);
157 Slur::after_line_breaking (SCM smob)
159 Score_element *me = unsmob_element (smob);
160 if (!gh_scm2int(scm_length (me->get_elt_property ("note-columns"))))
163 return SCM_UNSPECIFIED;
165 set_extremities (me);
166 set_control_points (me);
167 return SCM_UNSPECIFIED;
171 Slur::set_extremities (Score_element*me)
173 if (!Directional_element_interface (me).get ())
174 Directional_element_interface (me).set (get_default_dir (me));
176 Direction dir = LEFT;
179 if (!gh_symbol_p (index_cell (me->get_elt_property ("attachment"), dir)))
182 // for (SCM s = get_elt_property ("slur-extremity-rules"); s != SCM_EOL; s = gh_cdr (s))
183 for (SCM s = scm_eval (ly_symbol2scm ("slur-extremity-rules"));
184 s != SCM_EOL; s = gh_cdr (s))
186 SCM r = gh_call2 (gh_caar (s), me->self_scm (),
187 gh_int2scm ((int)dir));
190 index_set_cell (me->get_elt_property ("attachment"), dir,
197 while (flip (&dir) != LEFT);
201 Slur::get_attachment (Score_element*me,Direction dir,
202 Score_element **common)
204 Spanner*sp = dynamic_cast<Spanner*>(me);
205 SCM s = me->get_elt_property ("attachment");
206 SCM a = dir == LEFT ? gh_car (s) : gh_cdr (s);
207 String str = ly_symbol2string (a);
208 Real ss = Staff_symbol_referencer::staff_space ((Score_element*)me);
212 if (Note_column::has_interface (sp->get_bound (dir)))
214 Score_element * n =sp->get_bound (dir);
215 if (Score_element*st = Note_column::stem_l (n))
220 o = Offset (0, Stem::chord_start_f (st ));
222 Default position is centered in X, on outer side of head Y
224 o += Offset (0.5 * n->extent (X_AXIS).length (),
225 0.5 * ss * Directional_element_interface (me).get ());
227 else if (str == "alongside-stem")
229 o = Offset (0, Stem::chord_start_f (st ));
231 Default position is on stem X, on outer side of head Y
233 o += Offset (n->extent (X_AXIS).length ()
234 * (1 + Stem::get_direction (st )),
235 0.5 * ss * Directional_element_interface (me).get ());
237 else if (str == "stem")
239 o = Offset (0, Stem::stem_end_position (st ) * hs);
241 Default position is on stem X, at stem end Y
244 (n->extent (X_AXIS).length ()
245 - st->extent (X_AXIS).length ())
246 * (1 + Stem::get_direction (st )),
249 else if (str == "loose-end")
251 SCM other_a = dir == LEFT ? gh_cdr (s) : gh_car (s);
252 if (ly_symbol2string (other_a) != "loose-end")
254 o = Offset (0, get_attachment (me, -dir, common)[Y_AXIS]);
256 else if (dir == RIGHT)
258 o[X_AXIS] = (sp->get_bound (dir)->relative_coordinate (common[X_AXIS], X_AXIS)
259 - me->relative_coordinate (common[X_AXIS], X_AXIS));
266 gh_int2scm (Stem::get_direction (st ) * dir),
267 gh_int2scm (Directional_element_interface (me).get () * dir),
269 scm_eval (ly_symbol2scm ("slur-extremity-offset-alist")));
273 o += ly_scm2offset (gh_cdr (l)) * ss * dir;
280 What if get_bound () is not a note-column?
282 if (str != "loose-end"
283 && sp->get_bound (dir)->common_refpoint (common[Y_AXIS], Y_AXIS) == common[Y_AXIS])
285 o[Y_AXIS] += sp->get_bound (dir)->relative_coordinate (common[Y_AXIS], Y_AXIS)
286 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
293 Slur::get_encompass_offset_arr (Score_element*me)
295 Spanner*sp = dynamic_cast<Spanner*>(me);
296 SCM eltlist = me->get_elt_property ("note-columns");
297 Score_element *common[] = {me->common_refpoint (eltlist,X_AXIS),
298 me->common_refpoint (eltlist,Y_AXIS)};
301 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
302 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (LEFT), X_AXIS);
304 Link_array<Score_element> encompass_arr;
305 while (gh_pair_p (eltlist))
307 encompass_arr.push (unsmob_element (gh_car (eltlist)));
308 eltlist =gh_cdr (eltlist);
310 encompass_arr.reverse ();
313 Array<Offset> offset_arr;
315 Offset origin (me->relative_coordinate (common[X_AXIS], X_AXIS),
316 me->relative_coordinate (common[Y_AXIS], Y_AXIS));
319 int last = encompass_arr.size () - 2;
321 offset_arr.push (get_attachment (me, LEFT, common));
327 if (encompass_arr[0] != sp->get_bound (LEFT))
332 offset_arr[0][Y_AXIS] -=
333 encompass_arr[0]->relative_coordinate (common[Y_AXIS], Y_AXIS)
334 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
340 if (encompass_arr.top () != sp->get_bound (RIGHT))
345 for (int i = first; i <= last; i++)
347 Offset o (encompass_offset (me, encompass_arr[i], common));
348 offset_arr.push (o - origin);
351 offset_arr.push (Offset (sp->spanner_length (), 0) + get_attachment (me, RIGHT,common));
353 if (encompass_arr[0] != sp->get_bound (LEFT))
355 offset_arr.top ()[Y_AXIS] -= encompass_arr.top ()->relative_coordinate (common[Y_AXIS], Y_AXIS)
356 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
363 MAKE_SCHEME_CALLBACK(Slur,set_spacing_rods);
365 Slur::set_spacing_rods (SCM smob)
367 Score_element*me = unsmob_element (smob);
370 Spanner*sp = dynamic_cast<Spanner*>(me);
371 r.item_l_drul_[LEFT] = sp->get_bound (LEFT);
372 r.item_l_drul_[RIGHT] = sp->get_bound (RIGHT);
374 gh_scm2double (me->get_elt_property ("minimum-length"))
375 * me->paper_l ()->get_var ("staffspace");
378 return SCM_UNSPECIFIED;
383 Ugh should have dash-length + dash-period
385 MAKE_SCHEME_CALLBACK (Slur, brew_molecule);
387 Slur::brew_molecule (SCM smob)
389 Score_element * me = unsmob_element (smob);
390 if (!gh_scm2int(scm_length (me->get_elt_property ("note-columns"))))
396 Real thick = me->paper_l ()->get_var ("stafflinethickness") *
397 gh_scm2double (me->get_elt_property ("thickness"));
398 Bezier one = get_curve (me);
401 SCM d = me->get_elt_property ("dashed");
403 a = me->lookup_l ()->dashed_slur (one, thick, thick * gh_scm2double (d));
405 a = me->lookup_l ()->slur (one, Directional_element_interface (me).get () * thick, thick);
407 return a.create_scheme();
411 Slur::set_control_points (Score_element*me)
413 Real staff_space = Staff_symbol_referencer::staff_space ((Score_element*)me);
414 Real h_inf = me->paper_l ()->get_var ("slur_height_limit_factor") *
416 Real r_0 = me->paper_l ()->get_var ("slur_ratio");
418 Slur_bezier_bow bb (get_encompass_offset_arr (me),
419 Directional_element_interface (me).get (),
422 if (bb.fit_factor () > 1.0)
424 Real length = bb.curve_.control_[3][X_AXIS];
425 Real default_height = slur_height (length, h_inf, r_0);
426 bb.minimise_enclosed_area (me->paper_l());
428 Real bff = me->paper_l ()->get_var ("slur_force_blowfit");
429 bb.curve_.control_[1][Y_AXIS] *= bff;
430 bb.curve_.control_[2][Y_AXIS] *= bff;
433 Real sb = me->paper_l ()->get_var ("slur_beautiful");
434 Real beautiful = length * default_height * sb;
435 Real area = bb.enclosed_area_f ();
438 Slurs that fit beautifully are not ugly
440 if (area > beautiful)
441 de_uglyfy (me, &bb, default_height);
444 Bezier b = bb.get_bezier ();
447 SCM controls = SCM_EOL;
450 controls = gh_cons ( ly_offset2scm (b.control_[i]), controls);
453 All these null control-points, where do they all come from?
455 if (i && b.control_[i][X_AXIS] == 0)
459 me->set_elt_property ("control-points", controls);
463 Slur::get_curve (Score_element*me)
468 if (!Directional_element_interface (me).get ()
469 || ! gh_symbol_p (index_cell (me->get_elt_property ("attachment"), LEFT)))
470 set_extremities (me);
472 if (!gh_pair_p (me->get_elt_property ("control-points")))
473 set_control_points (me);
475 for (SCM s= me->get_elt_property ("control-points"); s != SCM_EOL; s = gh_cdr (s))
477 b.control_[i] = ly_scm2offset (gh_car (s));
481 Array<Offset> enc (get_encompass_offset_arr (me));
482 Direction dir = Directional_element_interface (me).get ();
484 Real x1 = enc[0][X_AXIS];
485 Real x2 = enc.top ()[X_AXIS];
488 for (int i=1; i < enc.size ()-1; i++)
490 Real x = enc[i][X_AXIS];
493 Real y = b.get_other_coordinate (X_AXIS, x);
494 off = off >? dir * (enc[i][Y_AXIS] - y);
497 b.translate (Offset (0, dir * off));
503 Slur::has_interface (Score_element*me)
505 return me->has_interface (ly_symbol2scm ("slur-interface"));