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--2007 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 "grob-interface.hh"
  14 #include "std-vector.hh"
  15 #include "lily-proto.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 HINT_DIRECTION_PENALTY;
  38   Real IDEAL_SLOPE_FACTOR;
  39   Real ROUND_TO_ZERO_SLOPE;
  40
  41   void fill (Grob *him);
  42 };
  43
  44 struct Beam_segment
  45 {
  46   int vertical_count_;
  47   Interval horizontal_;
  48   Beam_segment ();
  49 };
  50
  51 struct Beam_stem_segment
  52 {
  53   Beam_stem_segment ();
  54
  55   Grob *stem_;
  56   Real width_;
  57   Real stem_x_;
  58   int rank_;
  59   vsize stem_index_;
  60   bool gapped_;
  61   Direction dir_;
  62   int max_connect_;
  63
  64 };
  65
  66
  67 bool operator <(Beam_stem_segment const &a, Beam_stem_segment const &b);
  68
  69 class Beam
  70 {
  71 public:
  72   static int normal_stem_count (Grob *);
  73   static Grob *first_normal_stem (Grob *);
  74   static Grob *last_normal_stem (Grob *);
  75   DECLARE_GROB_INTERFACE();
  76   static void add_stem (Grob *, Grob *);
  77   static bool is_cross_staff (Grob *);
  78   static bool is_knee (Grob *);
  79   static void set_beaming (Grob *, Beaming_pattern const *);
  80   static void set_stemlens (Grob *);
  81   static int get_beam_count (Grob *me);
  82   static Real get_beam_translation (Grob *me);
  83   static Real get_thickness (Grob *me);
  84   static void connect_beams (Grob *me);
  85   static vector<Beam_segment> get_beam_segments (Grob *me_grob, Grob **common);
  86   static Interval no_visible_stem_positions (Grob *me, Interval default_value);
  87
  88   DECLARE_SCHEME_CALLBACK (rest_collision_callback, (SCM element, SCM prev_off));
  89   DECLARE_SCHEME_CALLBACK (print, (SCM));
  90   DECLARE_SCHEME_CALLBACK (calc_beaming, (SCM));
  91   DECLARE_SCHEME_CALLBACK (calc_stem_shorten, (SCM));
  92   DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
  93   DECLARE_SCHEME_CALLBACK (calc_positions, (SCM));
  94   DECLARE_SCHEME_CALLBACK (calc_least_squares_positions, (SCM, SCM));
  95   DECLARE_SCHEME_CALLBACK (calc_normal_stems, (SCM));
  96   DECLARE_SCHEME_CALLBACK (calc_concaveness, (SCM));
  97   DECLARE_SCHEME_CALLBACK (set_stem_lengths, (SCM));
  98   DECLARE_SCHEME_CALLBACK (calc_cross_staff, (SCM));
  99
 100   /* position callbacks */
 101   DECLARE_SCHEME_CALLBACK (shift_region_to_valid, (SCM, SCM));
 102   DECLARE_SCHEME_CALLBACK (slope_damping, (SCM, SCM));
 103   DECLARE_SCHEME_CALLBACK (quanting, (SCM, SCM));
 104
 105 static Real score_slopes_dy (Real, Real, Real, Real, Real, bool, Beam_quant_parameters const *);
 106
 107   static Real score_stem_lengths (vector<Grob*> const &stems,
 108                                   vector<Stem_info> const &stem_infos,
 109                                   vector<Real> const &base_stem_ys,
 110                                   vector<Real> const &stem_xs,
 111                                   Real xl, Real xr,
 112                                   bool knee,
 113                                   Real yl, Real yr, Beam_quant_parameters const *);
 114   static Real score_forbidden_quants (Real, Real,
 115                                       Real, Real, Real, Real,
 116                                       Drul_array<int>, Direction, Direction,
 117                                       Beam_quant_parameters const *);
 118
 119   static int get_direction_beam_count (Grob *me, Direction d);
 120 private:
 121   static Direction get_default_dir (Grob *);
 122   static void set_stem_directions (Grob *, Direction);
 123   static void consider_auto_knees (Grob *);
 124   static void set_stem_shorten (Grob *);
 125   static Real calc_stem_y (Grob *, Grob *s, Grob **c,
 126                            Real, Real, Direction,
 127                            Drul_array<Real> pos, bool french);
 128   static int forced_stem_count (Grob *);
 129 };
 130
 131
 132 #endif /* BEAM_HH */
 133