2 key-item.cc -- implement Key_signature_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1996--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 keyplacement by Mats Bengtsson
12 #include "output-def.hh"
13 #include "font-interface.hh"
14 #include "staff-symbol-referencer.hh"
16 #include "accidental-interface.hh"
18 struct Key_signature_interface
20 DECLARE_SCHEME_CALLBACK (print
, (SCM
));
22 static bool has_interface (Grob
*);
26 FIXME: too much hardcoding here.
28 const int FLAT_TOP_PITCH
= 2; /* fes, ges, as and bes typeset in lower octave */
29 const int SHARP_TOP_PITCH
= 4; /* ais and bis typeset in lower octave */
32 TODO: look this up. I'm not sure where the naturals ought to go.
34 const int NATURAL_TOP_PITCH
= 4;
37 FIXME: key-item should just get a list of (position, acc), and leave
38 the thinking to other parties.
40 - TODO: put this in Scheme
42 TODO: can we do without c0pos? it's partly musical.
45 alteration_pos (SCM what
, int alter
, int c0p
)
47 if (scm_is_pair (what
))
48 return scm_to_int (scm_car (what
)) * 7 + scm_to_int (scm_cdr (what
)) + c0p
;
50 int p
= scm_to_int (what
);
52 // Find the c in the range -4 through 2
53 int from_bottom_pos
= c0p
+ 4;
54 from_bottom_pos
= from_bottom_pos
%7;
55 from_bottom_pos
= (from_bottom_pos
+ 7)%7; // Precaution to get positive.
56 int c0
= from_bottom_pos
- 4;
58 if ((alter
< 0 && ((p
> FLAT_TOP_PITCH
) || (p
+ c0
> 4)) && (p
+ c0
> 1))
59 || (alter
> 0 && ((p
> SHARP_TOP_PITCH
) || (p
+ c0
> 5)) && (p
+ c0
> 2))
60 || (alter
== 0 && ((p
> NATURAL_TOP_PITCH
) || (p
+ c0
> 5)) && (p
+ c0
> 2)))
62 p
-= 7; /* Typeset below c_position */
65 /* Provide for the four cases in which there's a glitch
66 it's a hack, but probably not worth
67 the effort of finding a nicer solution.
69 if (c0
== 2 && alter
> 0 && p
== 3)
71 if (c0
==-3 && alter
> 0 && p
==-1)
73 if (c0
==-4 && alter
< 0 && p
==-1)
75 if (c0
==-2 && alter
< 0 && p
==-3)
83 - space the `natural' signs wider
85 MAKE_SCHEME_CALLBACK (Key_signature_interface
, print
, 1);
87 Key_signature_interface::print (SCM smob
)
89 Grob
*me
= unsmob_grob (smob
);
91 Real inter
= Staff_symbol_referencer::staff_space (me
) / 2.0;
93 SCM scm_style
= me
->get_property ("style");
95 if (scm_is_symbol (scm_style
))
97 style
= ly_symbol2string (scm_style
);
104 SCM newas
= me
->get_property ("new-accidentals");
107 SCM c0s
= me
->get_property ("c0-position");
109 if (scm_is_number (c0s
))
110 c0p
= scm_to_int (c0s
);
113 SCM lists are stacks, so we work from right to left, ending with
114 the cancellation signature.
117 Font_metric
*fm
= Font_interface::get_default_font (me
);
118 for (SCM s
= newas
; scm_is_pair (s
); s
= scm_cdr (s
))
120 int alteration
= scm_to_int (scm_cdar (s
));
122 = Accidental_interface::get_fontcharname (style
, alteration
);
123 Stencil
acc (fm
->find_by_name ("accidentals." + font_char
));
127 me
->warning (_f ("accidental `%s' not found", font_char
));
131 SCM what
= scm_caar (s
);
132 int pos
= alteration_pos (what
, alteration
, c0p
);
133 acc
.translate_axis (pos
* inter
, Y_AXIS
);
134 mol
.add_at_edge (X_AXIS
, LEFT
, acc
, 0, 0);
138 Item
*it
= dynamic_cast<Item
*> (me
);
139 if (it
->break_status_dir () != RIGHT
)
141 SCM old
= me
->get_property ("old-accidentals");
144 if (scm_is_pair (old
))
145 natural
= Font_interface::get_default_font (me
)->
146 find_by_name (String ("accidentals.") + style
+ String ("0"));
149 for (; scm_is_pair (old
); old
= scm_cdr (old
))
151 SCM found
= scm_assoc (scm_caar (old
), newas
);
152 if (found
== SCM_BOOL_F
153 || scm_cdr (found
) != scm_cdar (old
))
155 SCM what
= scm_caar (old
);
157 int pos
= alteration_pos (what
, alteration
, c0p
);
160 m
.translate_axis (pos
* inter
, Y_AXIS
);
163 The natural sign (unlike flat & sharp)
164 has vertical edges on both sides. A little padding is
165 needed to prevent collisions.
168 if (last_pos
< pos
+ 2
169 && last_pos
> pos
- 6)
172 mol
.add_at_edge (X_AXIS
, LEFT
, m
, padding
, 0);
178 mol
.align_to (X_AXIS
, LEFT
);
180 return mol
.smobbed_copy ();
183 ADD_INTERFACE (Key_signature_interface
, "key-signature-interface",
184 "A group of accidentals, to be printed as signature sign.",
185 "style c0-position old-accidentals new-accidentals");