2 stem.cc -- implement Stem
4 source file of the GNU LilyPond music typesetter
6 (c) 1996,1997 Han-Wen Nienhuys <hanwen@stack.nl>
8 TODO: This is way too hairy
14 #include "paper-def.hh"
15 #include "note-head.hh"
17 #include "molecule.hh"
23 const int STEMLEN
= 7;
25 IMPLEMENT_IS_TYPE_B1 (Stem
,Item
);
36 yextent_drul_
[DOWN
] = yextent_drul_
[UP
] = 0;
46 Stem::head_positions () const
49 for (int i
=0; i
< head_l_arr_
.size (); i
++)
51 int p
= head_l_arr_
[i
]->position_i_
;
52 r
[BIGGER
] = r
[BIGGER
] >? p
;
53 r
[SMALLER
] = r
[SMALLER
] <? p
;
59 Stem::do_print () const
62 DOUT
<< "flag "<< flag_i_
;
69 Stem::stem_length_f () const
71 return yextent_drul_
[UP
]-yextent_drul_
[DOWN
] ;
75 Stem::stem_begin_f () const
77 return yextent_drul_
[Direction(-dir_
)];
81 Stem::chord_start_f () const
83 return head_positions()[dir_
] * paper ()->internote_f ();
87 Stem::stem_end_f () const
89 return yextent_drul_
[dir_
];
93 Stem::set_stemend (Real se
)
96 if (dir_
&& dir_
* head_positions()[dir_
] >= se
*dir_
)
97 warning (_("Weird stem size; check for narrow beams"));
100 yextent_drul_
[dir_
] = se
;
101 yextent_drul_
[Direction(-dir_
)] = head_positions()[-dir_
];
105 Stem::type_i () const
107 return head_l_arr_
[0]->balltype_i_
;
111 Stem::add (Rhythmic_head
*n
)
113 n
->add_dependency (this); // ?
114 if (n
->is_type_b (Note_head::static_name ()))
116 head_l_arr_
.push ((Note_head
*)n
);
118 else if (n
->is_type_b (Rest::static_name ()))
120 rest_l_arr_
.push ((Rest
*)n
);
125 Stem::invisible_b () const
127 return (!head_l_arr_
.size () ||
128 head_l_arr_
[0]->balltype_i_
<= 0);
132 Stem::get_center_distance (Direction d
)
134 int staff_center
= 0;
135 int distance
= d
*(head_positions()[d
] - staff_center
);
136 return distance
>? 0;
140 Stem::get_default_dir ()
142 return (get_center_distance (UP
) >
143 get_center_distance (DOWN
))
155 Stem::set_default_dir ()
157 dir_
= get_default_dir ();
161 Stem::set_default_stemlen ()
164 Real dy
= paper ()->interbeam_f ();
169 /* If the stem points in the "wrong" direction, it should be
170 shortened, according to [Roush & Gourlay]. Their suggestion to knock off
171 a whole staffspace is a bit drastical though.
173 else if (dir_
!= get_default_dir ())
181 set_stemend ((dir_
> 0) ? head_positions()[BIGGER
] + len
:
182 head_positions()[SMALLER
] - len
);
185 if (dir_
* stem_end_f () < 0)
192 Stem::set_default_extents ()
194 if (!stem_length_f ())
195 set_default_stemlen ();
207 move into note_column.cc
211 Stem::set_noteheads ()
213 if (!head_l_arr_
.size ())
215 head_l_arr_
.sort (Note_head::compare
);
217 head_l_arr_
.reverse ();
219 head_l_arr_
[0]->extremal_i_
= -1;
220 head_l_arr_
.top ()->extremal_i_
= 1;
222 int lastpos
= head_l_arr_
[0]->position_i_
;
223 for (int i
=1; i
< head_l_arr_
.size (); i
++)
225 int dy
=abs (lastpos
- head_l_arr_
[i
]->position_i_
);
230 head_l_arr_
[i
]->x_dir_
= (stem_xdir_
== LEFT
) ? LEFT
: RIGHT
;
235 lastpos
= head_l_arr_
[i
]->position_i_
;
240 Stem::do_pre_processing ()
242 if (yextent_drul_
[DOWN
]== yextent_drul_
[UP
])
243 set_default_extents ();
246 transparent_b_
= invisible_b ();
247 set_empty (invisible_b ());
252 Stem::do_width () const
255 if (beam_l_
|| abs (flag_i_
) <= 2)
259 Paper_def
*p
= paper ();
260 r
= p
->lookup_l ()->flag (flag_i_
, dir_
).dim_
.x ();
261 r
+= note_delta_f ();
269 const Real ANGLE
= 20* (2.0*M_PI
/360.0); // ugh!
272 Stem::brew_molecule_p () const
274 Molecule
*mol_p
=new Molecule
;
275 Paper_def
*p
=paper ();
276 Drul_array
<Real
> stem_y
= yextent_drul_
;
277 Real dy
= p
->internote_f ();
281 if (head_l_arr_
.size ())
282 head_wid
= head_l_arr_
[0]->width ().length ();
283 stem_y
[Direction(-dir_
)] += dir_
* head_wid
* tan(ANGLE
)/(2*dy
);
287 Atom ss
=p
->lookup_l ()->stem (stem_y
[DOWN
]*dy
,
289 mol_p
->add (Atom (ss
));
292 if (!beam_l_
&&abs (flag_i_
) > 2)
294 Atom fl
= p
->lookup_l ()->flag (flag_i_
, dir_
);
295 fl
.translate_axis(stem_y
[dir_
]*dy
, Y_AXIS
);
299 if (head_l_arr_
.size())
301 mol_p
->translate_axis (note_delta_f (), X_AXIS
);
307 Stem::note_delta_f () const
310 if (head_l_arr_
.size())
312 Interval
head_wid(0, head_l_arr_
[0]->width ().length ());
313 Real
rule_thick(paper ()->rule_thickness ());
314 Interval
stem_wid(-rule_thick
/2, rule_thick
/2);
315 if (stem_xdir_
== CENTER
)
316 r
= head_wid
.center ();
318 r
= head_wid
[stem_xdir_
] - stem_wid
[stem_xdir_
];
323 Stem::hpos_f () const
325 return note_delta_f () +Item::hpos_f ();
329 TODO: head_l_arr_/rest_l_arr_ in do_substitute_dependent ()
332 Stem::do_substitute_dependency (Score_elem
*o
,Score_elem
*n
)
334 Item
* o_l
= o
->item ();
335 Item
* n_l
= n
? n
->item () : 0;
336 head_l_arr_
.substitute ((Note_head
*)o_l
, (Note_head
*)n_l
);
337 rest_l_arr_
.substitute ((Rest
*)o_l
, (Rest
*)n_l
);