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1 /*
2   beam.hh -- part of GNU LilyPond
3
4   source file of the LilyPond music typesetter
5
6   (c) 1996--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
7   Jan Nieuwenhuizen <janneke@gnu.org>
8 */
9
10 #ifndef BEAM_HH
11 #define BEAM_HH
12
13 #include "std-vector.hh"
14 #include "lily-proto.hh"
15 #include "lily-guile.hh"
16 #include "stem-info.hh"
17
18 /*
19   TODO: move quanting in separate file.
20 */
21 struct Beam_quant_parameters
22 {
23   Real INTER_QUANT_PENALTY;
24   Real SECONDARY_BEAM_DEMERIT;
25   Real STEM_LENGTH_DEMERIT_FACTOR;
26   Real REGION_SIZE;
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 const *);
53   static void set_stemlens (Grob *);
54   static int get_beam_count (Grob *me);
55   static Real get_beam_translation (Grob *me);
56   static Real get_thickness (Grob *me);
57   static void connect_beams (Grob *me);
58
59   DECLARE_SCHEME_CALLBACK (rest_collision_callback, (SCM element, SCM prev_off));
60   DECLARE_SCHEME_CALLBACK (print, (SCM));
61   DECLARE_SCHEME_CALLBACK (calc_beaming, (SCM));
62   DECLARE_SCHEME_CALLBACK (calc_stem_shorten, (SCM));
63   DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
64   DECLARE_SCHEME_CALLBACK (calc_positions, (SCM));
65   DECLARE_SCHEME_CALLBACK (calc_least_squares_positions, (SCM, SCM));
66   DECLARE_SCHEME_CALLBACK (calc_concaveness, (SCM));
67   DECLARE_SCHEME_CALLBACK (set_stem_lengths, (SCM));
68
69   /* position callbacks */
70   DECLARE_SCHEME_CALLBACK (shift_region_to_valid, (SCM, SCM));
71   DECLARE_SCHEME_CALLBACK (slope_damping, (SCM, SCM));
72   DECLARE_SCHEME_CALLBACK (quanting, (SCM, SCM));
73   
74 static Real score_slopes_dy (Real, Real, Real, Real, Real, bool, Beam_quant_parameters const *);
75
76   static Real score_stem_lengths (vector<Grob*> const &stems,
77                                   vector<Stem_info> const &stem_infos,
78                                   vector<Real> const &base_stem_ys,
79                                   vector<Real> const &stem_xs,
80                                   Real xl, Real xr,
81                                   bool knee,
82                                   Real yl, Real yr, Beam_quant_parameters const *);
83   static Real score_forbidden_quants (Real, Real,
84                                       Real, Real, Real, Real,
85                                       Drul_array<int>, Direction, Direction,
86                                       Beam_quant_parameters const *);
87
88   static int get_direction_beam_count (Grob *me, Direction d);
89 private:
90   static Direction get_default_dir (Grob *);
91   static void set_stem_directions (Grob *, Direction);
92   static void consider_auto_knees (Grob *);
93   static void set_stem_shorten (Grob *);
94   static Real calc_stem_y (Grob *, Grob *s, Grob **c,
95                            Real, Real,
96                            Drul_array<Real> pos, bool french);
97   static int forced_stem_count (Grob *);
98 };
99
100 #ifndef NDEBUG
101 #define DEBUG_QUANTING 1
102 #endif
103
104 #endif /* BEAM_HH */
105