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[lilypond.git] / lily / include / beam.hh
1 /*
2   beam.hh -- part of GNU LilyPond
3
4   source file of the LilyPond music typesetter
5
6   (c) 1996--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
7   Jan Nieuwenhuizen <janneke@gnu.org>
8 */
9
10 #ifndef BEAM_HH
11 #define BEAM_HH
12
13 #include "lily-proto.hh"
14 #include "lily-guile.hh"
15 #include "stem-info.hh"
16
17
18 /*
19   TODO: move quanting in separate file.
20  */
21 struct Beam_quant_parameters {
22   Real INTER_QUANT_PENALTY;
23   Real SECONDARY_BEAM_DEMERIT;
24   Real STEM_LENGTH_DEMERIT_FACTOR;
25   Real REGION_SIZE;
26
27
28   /*
29     threshold to combat rounding errors.
30   */
31   Real BEAM_EPS;
32
33   // possibly ridiculous, but too short stems just won't do
34   Real STEM_LENGTH_LIMIT_PENALTY;
35   Real DAMPING_DIRECTION_PENALTY;
36   Real MUSICAL_DIRECTION_FACTOR;
37   Real IDEAL_SLOPE_FACTOR;
38   Real ROUND_TO_ZERO_SLOPE;
39
40   void fill (Grob *him); 
41 };
42
43 class Beam
44 {
45 public:
46   static int visible_stem_count (Grob *);
47   static Grob *first_visible_stem (Grob *);
48   static Grob *last_visible_stem (Grob *);
49   static bool has_interface (Grob *);
50   static void add_stem (Grob *, Grob *);
51   static bool is_knee (Grob *);
52   static void set_beaming (Grob *, Beaming_info_list *);
53   static void set_stemlens (Grob *);
54   static int get_beam_count (Grob *me);
55   static void position_beam (Grob *me);
56   static Real get_beam_translation (Grob *me);
57   static Real get_thickness (Grob *me);
58   static void connect_beams (Grob *me);
59
60   DECLARE_SCHEME_CALLBACK (rest_collision_callback, (SCM element, SCM axis));
61   DECLARE_SCHEME_CALLBACK (space_function, (SCM, SCM));
62   DECLARE_SCHEME_CALLBACK (print, (SCM));
63   DECLARE_SCHEME_CALLBACK (before_line_breaking, (SCM));
64   DECLARE_SCHEME_CALLBACK (after_line_breaking, (SCM));
65
66   /* position callbacks */
67   DECLARE_SCHEME_CALLBACK (least_squares, (SCM));
68   DECLARE_SCHEME_CALLBACK (check_concave, (SCM));
69   DECLARE_SCHEME_CALLBACK (slope_damping, (SCM));
70   DECLARE_SCHEME_CALLBACK (shift_region_to_valid, (SCM));
71   DECLARE_SCHEME_CALLBACK (quanting, (SCM));
72   static Real score_slopes_dy (Real, Real, Real, Real, Real, bool, Beam_quant_parameters const*);
73
74   static Real score_stem_lengths (Link_array<Grob> const &stems,
75                                   Array<Stem_info> const &stem_infos,
76                                   Array<Real> const &base_stem_ys,
77                                   Array<Real> const &stem_xs,
78                                   Real xl, Real xr,
79                                   bool knee,
80                                   Real yl, Real yr, Beam_quant_parameters const*);
81   static Real score_forbidden_quants (Real, Real,
82                                       Real, Real, Real, Real,
83                                       Drul_array<int>, Direction, Direction,
84                                       Beam_quant_parameters const*);
85
86   static int get_direction_beam_count (Grob *me, Direction d);
87 private:
88   static Direction get_default_dir (Grob *);
89   static void set_stem_directions (Grob *, Direction);
90   static void consider_auto_knees (Grob *);
91   static void set_stem_shorten (Grob *);
92   static Real calc_stem_y (Grob *, Grob *s, Grob **c,
93                            Real, Real,
94                            Drul_array<Real> pos, bool french);
95   static void set_stem_lengths (Grob *);
96   static int forced_stem_count (Grob *);
97 };
98
99 #ifndef NDEBUG
100 #define DEBUG_QUANTING 1
101 #endif
102
103 #endif /* BEAM_HH */
104