/*
beam.hh -- part of GNU LilyPond
- (c) 1996--1999 Han-Wen Nienhuys
+ source file of the LilyPond music typesetter
+
+ (c) 1996--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Jan Nieuwenhuizen <janneke@gnu.org>
*/
#ifndef BEAM_HH
#define BEAM_HH
#include "lily-proto.hh"
-#include "directional-spanner.hh"
-
-
-/** a beam connects multiple stems.
-
- Beam adjusts the stems its owns to make sure that they reach the
- beam and that point in the correct direction
-
-elt property:
-
-damping: amount of beam slope damping. (int)
-
-should beam slope be damped? 0: no, 1: yes, 100000: horizontal beams
-
-slope_quantisation: 'none, 'normal or 'traditional
+#include "lily-guile.hh"
+#include "stem-info.hh"
+/*
+ TODO: move quanting in separate file.
*/
-class Beam : public Directional_spanner {
-public:
+struct Beam_quant_parameters
+{
+ Real INTER_QUANT_PENALTY;
+ Real SECONDARY_BEAM_DEMERIT;
+ Real STEM_LENGTH_DEMERIT_FACTOR;
+ Real REGION_SIZE;
+
+ /*
+ threshold to combat rounding errors.
+ */
+ Real BEAM_EPS;
+
+ // possibly ridiculous, but too short stems just won't do
+ Real STEM_LENGTH_LIMIT_PENALTY;
+ Real DAMPING_DIRECTION_PENALTY;
+ Real MUSICAL_DIRECTION_FACTOR;
+ Real IDEAL_SLOPE_FACTOR;
+ Real ROUND_TO_ZERO_SLOPE;
+
+ void fill (Grob *him);
+};
- int stem_count () const;
- Stem* stem (int) const;
- Stem* stem_top () const;
- int visible_stem_count () const;
- Stem* first_visible_stem () const;
- Stem* last_visible_stem () const;
-
- /**
- the slope of the beam in (staffpositions) per (X-dimension, in PT).
- UGH. standardise this for once and for all.
- */
- Real slope_f_;
-
- /// position of leftmost end of beam
- Real left_y_;
-
- /**
- highest number of beams present, for opening-up of beam-spacing
- and calculation of stem lengths
- */
- int multiplicity_i_;
-
- Beam ();
- void add_stem (Stem*);
-
- void set_grouping (Rhythmic_grouping def, Rhythmic_grouping current);
- void set_beaming (Beaming_info_list *);
- void set_stemlens ();
- VIRTUAL_COPY_CONS(Score_element);
-
-protected:
- Offset center () const;
- Direction get_default_dir () const;
- void set_direction (Direction);
- void set_stem_shorten ();
- bool auto_knee (SCM gap, bool interstaff_b);
- bool auto_knees ();
+class Beam
+{
+public:
+ static int visible_stem_count (Grob *);
+ static Grob *first_visible_stem (Grob *);
+ static Grob *last_visible_stem (Grob *);
+ static bool has_interface (Grob *);
+ static void add_stem (Grob *, Grob *);
+ static bool is_knee (Grob *);
+ static void set_beaming (Grob *, Beaming_info_list const *);
+ static void set_stemlens (Grob *);
+ static int get_beam_count (Grob *me);
+ static Real get_beam_translation (Grob *me);
+ static Real get_thickness (Grob *me);
+ static void connect_beams (Grob *me);
+
+ DECLARE_SCHEME_CALLBACK (rest_collision_callback, (SCM element, SCM prev_off));
+ DECLARE_SCHEME_CALLBACK (print, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_beaming, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_stem_shorten, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_direction, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_positions, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_least_squares_positions, (SCM, SCM));
+ DECLARE_SCHEME_CALLBACK (calc_concaveness, (SCM));
+ DECLARE_SCHEME_CALLBACK (set_stem_lengths, (SCM));
+
+ /* position callbacks */
+ DECLARE_SCHEME_CALLBACK (shift_region_to_valid, (SCM, SCM));
+ DECLARE_SCHEME_CALLBACK (slope_damping, (SCM, SCM));
+ DECLARE_SCHEME_CALLBACK (quanting, (SCM, SCM));
- virtual void do_pre_processing ();
- virtual void do_post_processing ();
- virtual void do_add_processing ();
- virtual void do_print() const;
- virtual Molecule*do_brew_molecule_p () const;
-
- Molecule stem_beams (Stem *here, Stem *next, Stem *prev) const;
-
+static Real score_slopes_dy (Real, Real, Real, Real, Real, bool, Beam_quant_parameters const *);
+
+ static Real score_stem_lengths (Link_array<Grob> const &stems,
+ Array<Stem_info> const &stem_infos,
+ Array<Real> const &base_stem_ys,
+ Array<Real> const &stem_xs,
+ Real xl, Real xr,
+ bool knee,
+ Real yl, Real yr, Beam_quant_parameters const *);
+ static Real score_forbidden_quants (Real, Real,
+ Real, Real, Real, Real,
+ Drul_array<int>, Direction, Direction,
+ Beam_quant_parameters const *);
+
+ static int get_direction_beam_count (Grob *me, Direction d);
private:
- void calculate_slope ();
- Real check_stemlengths_f (bool set_b);
- void solve_slope ();
-
- void quantise_left_y (bool extend_b);
- void quantise_dy ();
-
+ static Direction get_default_dir (Grob *);
+ static void set_stem_directions (Grob *, Direction);
+ static void consider_auto_knees (Grob *);
+ static void set_stem_shorten (Grob *);
+ static Real calc_stem_y (Grob *, Grob *s, Grob **c,
+ Real, Real,
+ Drul_array<Real> pos, bool french);
+ static int forced_stem_count (Grob *);
};
-#endif // BEAM_HH
+#ifndef NDEBUG
+#define DEBUG_QUANTING 1
+#endif
+
+#endif /* BEAM_HH */
projects / lilypond.git / blobdiff