2 hairpin.cc -- implement Hairpin
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "staff-symbol-referencer.hh"
10 #include "molecule.hh"
11 #include "line-interface.hh"
14 #include "font-interface.hh"
15 #include "dimensions.hh"
16 #include "paper-def.hh"
18 #include "paper-column.hh"
21 MAKE_SCHEME_CALLBACK (Hairpin, brew_molecule, 1);
24 Hairpin::brew_molecule (SCM smob)
26 Grob *me= unsmob_grob (smob);
27 Spanner *spanner = dynamic_cast<Spanner*> (me);
29 SCM s = me->get_grob_property ("grow-direction");
30 if (!is_direction (s))
36 Direction grow_dir = to_dir (s);
39 /* Ugh, must be same as Text_spanner::brew_molecule. */
42 Ugh. property name is not general.
44 Real padding = gh_scm2double (me->get_grob_property ("if-text-padding"));
46 Drul_array<bool> broken;
47 Drul_array<Item*> bounds ;
51 bounds[d] =spanner->get_bound (d);
52 broken[d] = bounds[d]->break_status_dir () != CENTER;
54 while (flip (&d) != LEFT);
56 Grob *common = bounds[LEFT]->common_refpoint (bounds[RIGHT], X_AXIS);
57 Drul_array<Real> x_points ;
62 x_points[d] = b->relative_coordinate (common, X_AXIS);
66 x_points[d] = b->extent (common,X_AXIS)[RIGHT] ;
70 if (dynamic_cast<Paper_column*> (b))
73 If we're hung on a paper column, that means we're not
74 adjacent to a text-dynamic, and we may move closer. We
75 make the padding a little smaller, here.
77 Interval e =b->extent (common, X_AXIS);
79 e = Interval (0,0) + b->relative_coordinate (common, X_AXIS);
81 x_points[d] = e.center () - d * padding /3; // ugh.
85 Interval e =b->extent (common, X_AXIS);
87 x_points[d] = e[-d] - d*padding;
91 while (flip (&d) != LEFT);
94 Real width = x_points[RIGHT] - x_points[LEFT];
98 me->warning (_ ((grow_dir < 0) ? "decrescendo too small"
99 : "crescendo too small"));
103 bool continued = broken[Direction (-grow_dir)];
104 Real height = robust_scm2double (me->get_grob_property ("height"), 0.2) *
105 Staff_symbol_referencer::staff_space (me);
111 endh = continued ? height/2 : 0.0;
115 starth = continued ? height/2 : 0.0;
120 should do relative to staff-symbol staff-space?
124 mol = Line_interface::line (me, Offset (0, starth), Offset (width, endh));
125 mol.add_molecule (Line_interface::line (me,
127 Offset (width, -endh)));
129 mol.translate_axis (x_points[LEFT]
130 - bounds[LEFT]->relative_coordinate (common, X_AXIS),
132 return mol.smobbed_copy ();
137 ADD_INTERFACE (Hairpin, "hairpin-interface",
138 "hairpin crescendo.",
139 "grow-direction height if-text-padding");