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_elt_property ("note-columns", SCM_EOL);
42 me->set_elt_property ("control-points", SCM_EOL);
43 me->set_interface (ly_symbol2scm ("slur-interface"));
47 Slur::add_column (Score_element*me, Score_element*n)
49 if (!gh_pair_p (n->get_elt_property ("note-heads")))
50 warning (_ ("Putting slur over rest. Ignoring."));
53 Pointer_group_interface (me, "note-columns").add_element (n);
54 me->add_dependency (n);
57 add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*>(n));
61 Slur::de_uglyfy (Score_element*me, Slur_bezier_bow* bb, Real default_height)
63 Real length = bb->curve_.control_[3][X_AXIS] ;
64 Real ff = bb->fit_factor ();
65 for (int i = 1; i < 3; i++)
67 Real ind = abs (bb->curve_.control_[(i-1)*3][X_AXIS]
68 - bb->curve_.control_[i][X_AXIS]) / length;
69 Real h = bb->curve_.control_[i][Y_AXIS] * ff / length;
71 Real f = default_height / length;
72 Real c1 = me->paper_l ()->get_var ("bezier_control1");
73 Real c2 = me->paper_l ()->get_var ("bezier_control2");
74 Real c3 = me->paper_l ()->get_var ("bezier_control3");
79 else if (h > c2 + c3 * ind)
84 bb->curve_.control_[i][Y_AXIS] = h * length;
87 bb->curve_.assert_sanity ();
91 Slur::get_default_dir (Score_element*me)
93 Link_array<Score_element> encompass_arr =
94 Pointer_group_interface__extract_elements (me, (Score_element*)0, "note-columns");
97 for (int i=0; i < encompass_arr.size (); i ++)
99 if (Note_column::dir (encompass_arr[i]) < 0)
113 Slur::encompass_offset (Score_element*me,
115 Score_element **common)
118 Score_element* stem_l = unsmob_element (col->get_elt_property ("stem"));
120 Direction dir = Directional_element_interface (me).get ();
124 warning (_ ("Slur over rest?"));
125 o[X_AXIS] = col->relative_coordinate (common[X_AXIS], X_AXIS);
126 o[Y_AXIS] = col->relative_coordinate (common[Y_AXIS], Y_AXIS);
129 Direction stem_dir = Directional_element_interface (stem_l).get ();
130 o[X_AXIS] = stem_l->relative_coordinate (0, X_AXIS);
133 Simply set x to middle of notehead
136 o[X_AXIS] -= 0.5 * stem_dir * col->extent (X_AXIS).length ();
138 if ((stem_dir == dir)
139 && !stem_l->extent (Y_AXIS).empty_b ())
141 o[Y_AXIS] = stem_l->relative_coordinate (common[Y_AXIS], Y_AXIS); // iuhg
145 o[Y_AXIS] = col->relative_coordinate (common[Y_AXIS], Y_AXIS); // ugh
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);
158 Slur::after_line_breaking (SCM smob)
160 Score_element *me = unsmob_element (smob);
161 set_extremities (me);
162 set_control_points (me);
163 return SCM_UNDEFINED;
167 Slur::set_extremities (Score_element*me)
169 if (!Directional_element_interface (me).get ())
170 Directional_element_interface (me).set (get_default_dir (me));
172 Direction dir = LEFT;
175 if (!gh_symbol_p (index_cell (me->get_elt_property ("attachment"), dir)))
178 // for (SCM s = get_elt_property ("slur-extremity-rules"); s != SCM_EOL; s = gh_cdr (s))
179 for (SCM s = scm_eval (ly_symbol2scm ("slur-extremity-rules"));
180 s != SCM_EOL; s = gh_cdr (s))
182 SCM r = gh_call2 (gh_caar (s), me->self_scm_,
183 gh_int2scm ((int)dir));
186 index_set_cell (me->get_elt_property ("attachment"), dir,
193 while (flip (&dir) != LEFT);
197 Slur::get_attachment (Score_element*me,Direction dir,
198 Score_element **common)
200 Spanner*sp = dynamic_cast<Spanner*>(me);
201 SCM s = me->get_elt_property ("attachment");
202 SCM a = dir == LEFT ? gh_car (s) : gh_cdr (s);
203 String str = ly_symbol2string (a);
204 Real ss = Staff_symbol_referencer::staff_space ((Score_element*)me);
209 if (Note_column::has_interface (sp->get_bound (dir)))
211 Score_element * n =sp->get_bound (dir);
212 if (Score_element*st = Note_column::stem_l (n))
217 o = Offset (0, Stem::chord_start_f (st ));
219 Default position is centered in X, on outer side of head Y
221 o += Offset (0.5 * n->extent (X_AXIS).length (),
222 0.5 * ss * Directional_element_interface (me).get ());
224 else if (str == "alongside-stem")
226 o = Offset (0, Stem::chord_start_f (st ));
228 Default position is on stem X, on outer side of head Y
230 o += Offset (n->extent (X_AXIS).length ()
231 * (1 + Stem::get_direction (st )),
232 0.5 * ss * Directional_element_interface (me).get ());
234 else if (str == "stem")
236 o = Offset (0, Stem::stem_end_position (st ) * hs);
238 Default position is on stem X, at stem end Y
241 (n->extent (X_AXIS).length ()
242 - st->extent (X_AXIS).length ())
243 * (1 + Stem::get_direction (st )),
246 else if (str == "loose-end")
248 SCM other_a = dir == LEFT ? gh_cdr (s) : gh_car (s);
249 if (ly_symbol2string (other_a) != "loose-end")
251 o = Offset (0, get_attachment (me, -dir, common)[Y_AXIS]);
258 gh_int2scm (Stem::get_direction (st ) * dir),
259 gh_int2scm (Directional_element_interface (me).get () * dir),
261 scm_eval (ly_symbol2scm ("slur-extremity-offset-alist")));
265 o += ly_scm2offset (gh_cdr (l)) * ss * dir;
272 What if get_bound () is not a note-column?
274 if (str != "loose-end"
275 && sp->get_bound (dir)->common_refpoint (common[Y_AXIS], Y_AXIS) == common[Y_AXIS])
277 o[Y_AXIS] += sp->get_bound (dir)->relative_coordinate (common[Y_AXIS], Y_AXIS)
278 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
284 Slur::get_encompass_offset_arr (Score_element*me)
286 Spanner*sp = dynamic_cast<Spanner*>(me);
287 SCM eltlist = me->get_elt_property ("note-columns");
288 Score_element *common[] = {me->common_refpoint (eltlist,X_AXIS),
289 me->common_refpoint (eltlist,Y_AXIS)};
292 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (RIGHT), X_AXIS);
293 common[X_AXIS] = common[X_AXIS]->common_refpoint (sp->get_bound (LEFT), X_AXIS);
295 Link_array<Score_element> encompass_arr;
296 while (gh_pair_p (eltlist))
298 encompass_arr.push (unsmob_element (gh_car (eltlist)));
299 eltlist =gh_cdr (eltlist);
301 encompass_arr.reverse ();
304 Array<Offset> offset_arr;
306 Offset origin (me->relative_coordinate (common[X_AXIS], X_AXIS),
307 me->relative_coordinate (common[Y_AXIS], Y_AXIS));
310 int last = encompass_arr.size () - 2;
312 offset_arr.push (get_attachment (me, LEFT, common));
318 if (encompass_arr[0] != sp->get_bound (LEFT))
323 offset_arr[0][Y_AXIS] -=
324 encompass_arr[0]->relative_coordinate (common[Y_AXIS], Y_AXIS)
325 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
331 if (encompass_arr.top () != sp->get_bound (RIGHT))
336 for (int i = first; i <= last; i++)
338 Offset o (encompass_offset (me, encompass_arr[i], common));
339 offset_arr.push (o - origin);
342 offset_arr.push (Offset (sp->spanner_length (), 0) + get_attachment (me, RIGHT,common));
344 if (encompass_arr[0] != sp->get_bound (LEFT))
346 offset_arr.top ()[Y_AXIS] -= encompass_arr.top ()->relative_coordinate (common[Y_AXIS], Y_AXIS)
347 - me->relative_coordinate (common[Y_AXIS], Y_AXIS);
354 MAKE_SCHEME_CALLBACK(Slur,set_spacing_rods);
356 Slur::set_spacing_rods (SCM smob)
358 Score_element*me = unsmob_element (smob);
361 Spanner*sp = dynamic_cast<Spanner*>(me);
362 r.item_l_drul_[LEFT] = sp->get_bound (LEFT);
363 r.item_l_drul_[RIGHT] = sp->get_bound (RIGHT);
364 r.distance_f_ = me->paper_l ()->get_var ("slur_x_minimum");
367 return SCM_UNDEFINED;
372 Ugh should have dash-length + dash-period
374 MAKE_SCHEME_CALLBACK(Slur,brew_molecule);
376 Slur::brew_molecule (SCM smob)
378 Score_element * me = unsmob_element (smob);
379 Real thick = me->paper_l ()->get_var ("slur_thickness");
380 Bezier one = get_curve (me);
383 SCM d = me->get_elt_property ("dashed");
385 a = me->lookup_l ()->dashed_slur (one, thick, thick * gh_scm2double (d));
387 a = me->lookup_l ()->slur (one, Directional_element_interface (me).get () * thick, thick);
389 return a.create_scheme();
393 Slur::set_control_points (Score_element*me)
395 Slur_bezier_bow bb (get_encompass_offset_arr (me),
396 Directional_element_interface (me).get ());
398 Real staff_space = Staff_symbol_referencer::staff_space (me);
399 Real h_inf = me->paper_l ()->get_var ("slur_height_limit_factor") * staff_space;
400 Real r_0 = me->paper_l ()->get_var ("slur_ratio");
402 bb.set_default_bezier (h_inf, r_0);
404 if (bb.fit_factor () > 1.0)
406 Real length = bb.curve_.control_[3][X_AXIS];
407 Real default_height = bb.get_default_height (h_inf, r_0, length);
408 bb.minimise_enclosed_area (me->paper_l(), default_height);
410 Real bff = me->paper_l ()->get_var ("slur_force_blowfit");
411 bb.curve_.control_[1][Y_AXIS] *= bff;
412 bb.curve_.control_[2][Y_AXIS] *= bff;
415 Real sb = me->paper_l ()->get_var ("slur_beautiful");
416 Real beautiful = length * default_height * sb;
417 Real area = bb.enclosed_area_f ();
420 Slurs that fit beautifully are not ugly
422 if (area > beautiful)
423 de_uglyfy (me, &bb, default_height);
426 Bezier b = bb.get_bezier ();
429 SCM controls = SCM_EOL;
431 controls = gh_cons ( ly_offset2scm (b.control_[i]), controls);
433 me->set_elt_property ("control-points", controls);
438 Slur::get_curve (Score_element*me)
443 if (!Directional_element_interface (me).get ()
444 || ! gh_symbol_p (index_cell (me->get_elt_property ("attachment"), LEFT)))
445 set_extremities (me);
447 if (!gh_pair_p (me->get_elt_property ("control-points")))
448 set_control_points (me);
451 for (SCM s= me->get_elt_property ("control-points"); s != SCM_EOL; s = gh_cdr (s))
453 b.control_[i] = ly_scm2offset (gh_car (s));
457 Array<Offset> enc (get_encompass_offset_arr (me));
458 Direction dir = Directional_element_interface (me).get ();
460 Real x1 = enc[0][X_AXIS];
461 Real x2 = enc.top ()[X_AXIS];
464 for (int i=1; i < enc.size ()-1; i++)
466 Real x = enc[i][X_AXIS];
469 Real y = b.get_other_coordinate (X_AXIS, x);
470 off = off >? dir * (enc[i][Y_AXIS] - y);
473 b.translate (Offset (0, dir * off));
479 Slur::has_interface (Score_element*me)
481 return me->has_interface ("slur-interface");