2 tie.cc -- implement Tie
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
13 #include "paper-def.hh"
15 #include "rhythmic-head.hh"
17 #include "paper-column.hh"
19 #include "staff-symbol-referencer.hh"
20 #include "directional-element-interface.hh"
21 #include "molecule.hh"
22 #include "bezier-bow.hh"
24 #include "note-head.hh"
27 tie: Connect two noteheads.
31 c4 ~ \clef bass ; c4 or
35 do we have non-horizontal ties then?
40 Tie::set_head (Grob*me,Direction d, Item * head_l)
42 assert (!head (me,d));
43 index_set_cell (me->get_grob_property ("heads"), d, head_l->self_scm ());
45 dynamic_cast<Spanner*> (me)->set_bound (d, head_l);
46 me->add_dependency (head_l);
50 Tie::set_interface (Grob*me)
52 me->set_grob_property ("heads", gh_cons (SCM_EOL, SCM_EOL));
53 me->set_interface (ly_symbol2scm ("tie-interface"));
57 Tie::has_interface (Grob*me)
59 return me->has_interface (ly_symbol2scm ("tie-interface"));
63 Tie::head (Grob*me, Direction d)
65 SCM c = me->get_grob_property ("heads");
66 c = index_cell (c, d);
68 return unsmob_grob (c);
72 Tie::position_f (Grob*me)
74 Direction d = head (me,LEFT) ? LEFT:RIGHT;
75 return Staff_symbol_referencer::position_f (head (me,d));
80 Default: Put the tie oppositie of the stem [Wanske p231]
82 In case of chords: Tie_column takes over
84 The direction of the Tie is more complicated (See [Ross] p136 and
88 Tie::get_default_dir (Grob*me)
90 Item * sl = head (me,LEFT) ? Rhythmic_head::stem_l (head (me,LEFT)) :0;
91 Item * sr = head (me,RIGHT) ? Rhythmic_head::stem_l (head (me,RIGHT)) :0;
95 if (Directional_element_interface::get (sl) == UP
96 && Directional_element_interface::get (sr) == UP)
101 Item *s = sl ? sl : sr;
102 return - Directional_element_interface::get (s);
111 Tie::get_control_points (SCM smob)
113 Spanner*me = unsmob_spanner (smob);
114 Direction headdir = CENTER;
117 else if (head (me,RIGHT))
121 programming_error ("Tie without heads.");
123 return SCM_UNSPECIFIED;
126 if (!Directional_element_interface::get (me))
127 Directional_element_interface::set (me, Tie::get_default_dir (me));
129 Real staff_space = Staff_symbol_referencer::staff_space (me);
131 Real x_gap_f = gh_scm2double (me->get_grob_property ("x-gap"));
133 Grob* l = me->get_bound (LEFT);
134 Grob* r = me->get_bound (RIGHT);
136 Grob* commonx = me->common_refpoint (l, X_AXIS);
137 commonx = me->common_refpoint (r, X_AXIS);
142 this is a kludge: the tie has to be long enough to be
143 visible, but should not go through key sigs.
149 if (Note_head::has_interface (l))
150 left_x = l->extent (l, X_AXIS)[RIGHT] + x_gap_f;
152 left_x = l->extent (l, X_AXIS).linear_combination (lambda);
156 if (Note_head::has_interface (l) && Note_head::has_interface (r))
159 + r->extent (commonx,X_AXIS)[LEFT]
160 - l->extent (commonx, X_AXIS)[RIGHT]
165 if (Note_head::has_interface (l))
166 width = r->relative_coordinate (commonx, X_AXIS)
167 - l->extent (commonx, X_AXIS)[RIGHT]
171 - l->extent (commonx, X_AXIS).linear_combination (lambda)
172 + r->extent (commonx, X_AXIS)[LEFT]
176 Direction dir = Directional_element_interface::get (me);
178 SCM details = me->get_grob_property ("details");
180 SCM lim // groetjes aan de chirurgendochter.
181 = scm_assq (ly_symbol2scm ("height-limit"),details);
183 Real h_inf = gh_scm2double (ly_cdr (lim)) * staff_space;
184 Real r_0 = gh_scm2double (ly_cdr (scm_assq (ly_symbol2scm ("ratio"),details)));
186 Bezier b = slur_shape (width, h_inf, r_0);
189 I think this better, particularly for small ties. It always allows the user to move ties if
190 they seem in the wrong place
192 TODO: what if 2 heads have different size.
196 Real ypos = Tie::position_f (me) * staff_space/2
197 + dir * gh_scm2double (me->get_grob_property ("y-offset"));;
200 Make sure we don't start on a dots
202 if (Note_head::has_interface (l) && Rhythmic_head::dots_l (l))
204 Grob* dots = Rhythmic_head::dots_l(l);
205 if(fabs (staff_space * Staff_symbol_referencer::position_f (dots) /2
214 todo: prevent ending / staffline collision.
216 todo: tie / stem collision
219 b = slur_shape (width,h_inf, r_0);
221 b.translate (Offset (left_x, ypos));
225 Avoid colliding of the horizontal part with stafflines.
228 TODO: redo this, heuristic is half-baken, and ties often look ugly
231 TODO: doesn't work when on staff with even number of lines.
233 Array<Real> horizontal (b.solve_derivative (Offset (1,0)));
234 if (horizontal.size ())
237 ugh. Doesnt work for non-horizontal curves.
239 Real y = b.curve_point (horizontal[0])[Y_AXIS];
241 Real ry = rint (y/staff_space) * staff_space;
245 Real clear = staff_space * gh_scm2double (me->get_grob_property ("staffline-clearance"));
247 if (fabs (y) <= Staff_symbol_referencer::staff_radius (me)
248 && fabs (diff) < clear)
250 Real y1 = ry + clear;
251 Real y2 = ry - clear;
253 newy = (fabs (y1 - y) < fabs (y2 - y)) ? y1 : y2;
255 // newy = ry - 0.5 * staff_space * sign (diff) ;
258 we don't want horizontal ties
260 if (fabs (newy - b.control_[0][Y_AXIS]) < 1e-2)
262 newy = newy + dir * staff_space;
266 Real y0 = b.control_ [0][Y_AXIS];
267 b.control_[2][Y_AXIS] =
268 b.control_[1][Y_AXIS] =
269 (b.control_[1][Y_AXIS] - y0) * ((newy - y0) / (y - y0)) + y0;
272 programming_error ("Tie is nowhere horizontal");
276 SCM controls = SCM_EOL;
278 controls = gh_cons (ly_offset2scm (b.control_[i]), controls);
283 MAKE_SCHEME_CALLBACK (Tie,brew_molecule,1);
285 Tie::brew_molecule (SCM smob)
287 Grob*me = unsmob_grob (smob);
289 SCM cp = me->get_grob_property ("control-points");
292 cp = get_control_points (smob);
293 me->set_grob_property ("control-points", cp);
297 gh_scm2double (me->get_grob_property ("thickness"))
298 * me->paper_l ()->get_var ("stafflinethickness");
302 for (SCM s= cp; s != SCM_EOL; s = ly_cdr (s))
304 b.control_[i] = ly_scm2offset (ly_car (s));
308 Molecule a = Lookup::slur (b, Directional_element_interface::get (me) * thick, thick);
310 return a.smobbed_copy ();