2 slur.cc -- implement external interface for Slur
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7 Jan Nieuwenhuizen <janneke@gnu.org>
15 #include "directional-element-interface.hh"
16 #include "font-interface.hh"
17 #include "pointer-group-interface.hh"
19 #include "main.hh" // DEBUG_SLUR_SCORING
20 #include "note-column.hh"
21 #include "output-def.hh"
23 #include "staff-symbol-referencer.hh"
24 #include "staff-symbol.hh"
26 #include "text-interface.hh"
28 #include "slur-scoring.hh"
30 #include "script-interface.hh"
34 MAKE_SCHEME_CALLBACK(Slur, calc_direction, 1)
36 Slur::calc_direction (SCM smob)
38 Grob *me = unsmob_grob (smob);
39 extract_grob_set (me, "note-columns", encompasses);
41 if (encompasses.is_empty ())
48 for (int i = 0; i < encompasses.size (); i++)
50 if (Note_column::dir (encompasses[i]) < 0)
56 return scm_from_int (d);
59 MAKE_SCHEME_CALLBACK (Slur, height, 2);
61 Slur::height (SCM smob, SCM ax)
63 Axis a = (Axis)scm_to_int (ax);
64 Grob *me = unsmob_grob (smob);
67 SCM mol = me->get_uncached_stencil ();
69 if (Stencil *m = unsmob_stencil (mol))
71 return ly_interval2scm (ext);
75 Ugh should have dash-length + dash-period
77 MAKE_SCHEME_CALLBACK (Slur, print, 1);
79 Slur::print (SCM smob)
81 Grob *me = unsmob_grob (smob);
82 extract_grob_set (me, "note-columns", encompasses);
83 if (encompasses.is_empty ())
89 Real staff_thick = Staff_symbol_referencer::line_thickness (me);
90 Real base_thick = robust_scm2double (me->get_property ("thickness"), 1);
91 Real thick = base_thick * staff_thick;
92 Bezier one = get_curve (me);
96 TODO: replace dashed with generic property.
98 SCM p = me->get_property ("dash-period");
99 SCM f = me->get_property ("dash-fraction");
100 if (scm_is_number (p) && scm_is_number (f))
101 a = Lookup::dashed_slur (one, thick, robust_scm2double (p, 1.0),
102 robust_scm2double (f, 0));
104 a = Lookup::slur (one,
105 get_grob_direction (me) * staff_thick * 1.0,
108 #if DEBUG_SLUR_SCORING
109 SCM quant_score = me->get_property ("quant-score");
111 if (to_boolean (me->get_layout ()
112 ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")))
113 && scm_is_string (quant_score))
116 SCM properties = Font_interface::text_font_alist_chain (me);
118 Stencil tm = *unsmob_stencil (Text_interface::interpret_markup
119 (me->get_layout ()->self_scm (), properties,
121 a.add_at_edge (Y_AXIS, get_grob_direction (me), tm, 1.0, 0);
125 return a.smobbed_copy ();
129 Slur::get_curve (Grob *me)
133 for (SCM s = me->get_property ("control-points"); s != SCM_EOL;
135 b.control_[i++] = ly_scm2offset (scm_car (s));
141 Slur::add_column (Grob *me, Grob *n)
143 Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-columns"), n);
144 add_bound_item (dynamic_cast<Spanner *> (me), dynamic_cast<Item *> (n));
148 Slur::add_extra_encompass (Grob *me, Grob *n)
150 Pointer_group_interface::add_grob (me, ly_symbol2scm ("encompass-objects"), n);
154 MAKE_SCHEME_CALLBACK (Slur, outside_slur_callback, 2);
156 Slur::outside_slur_callback (SCM grob, SCM axis)
158 Grob *script = unsmob_grob (grob);
159 Axis a = Axis (scm_to_int (axis));
161 assert (a == Y_AXIS);
163 Grob *slur = unsmob_grob (script->get_object ("slur"));
166 return scm_from_int (0);
168 Direction dir = get_grob_direction (script);
170 return scm_from_int (0);
172 Grob *cx = script->common_refpoint (slur, X_AXIS);
173 Grob *cy = script->common_refpoint (slur, Y_AXIS);
175 Bezier curve = Slur::get_curve (slur);
177 curve.translate (Offset (slur->relative_coordinate (cx, X_AXIS),
178 slur->relative_coordinate (cy, Y_AXIS)));
180 Interval yext = robust_relative_extent (script, cy, Y_AXIS);
181 Interval xext = robust_relative_extent (script, cx, X_AXIS);
183 /* FIXME: slur property, script property? */
184 Real slur_padding = robust_scm2double (script->get_property ("slur-padding"),
186 yext.widen (slur_padding);
189 Interval bezext (curve.control_[0][X_AXIS], curve.control_[3][X_AXIS]);
190 bool consider[] = { false, false, false };
191 Real ys[] = {0, 0, 0};
192 bool do_shift = false;
193 SCM avoid = script->get_property ("avoid-slur");
195 for (int d = LEFT, k = 0; d <= RIGHT; d++, k++)
197 Real x = xext.linear_combination ((Direction) d);
198 consider[k] = bezext.contains (x);
203 = (fabs (bezext[LEFT] - x) < EPS)
204 ? curve.control_[0][Y_AXIS]
205 : ((fabs (bezext[RIGHT] - x) < EPS)
206 ? curve.control_[3][Y_AXIS]
207 : curve.get_other_coordinate (X_AXIS, x));
210 /* Request shift if slur is contained script's Y, or if
211 script is inside slur and avoid == outside. */
212 if (yext.contains (ys[k])
213 || (avoid == ly_symbol2scm ("outside")
214 && dir * ys[k] > dir * yext[-dir]))
221 for (int d = LEFT, k = 0; d <= RIGHT; d++, k++)
222 offset = dir * (max (dir * offset,
223 dir * (ys[k] - yext[-dir] + dir * slur_padding)));
226 return scm_from_double (offset);
231 ADD_INTERFACE (Slur, "slur-interface",