/*
- beam.hh -- part of LilyPond
+ beam.hh -- part of GNU LilyPond
- (c) 1996,97 Han-Wen Nienhuys
+ (c) 1996--2000 Han-Wen Nienhuys
*/
#ifndef BEAM_HH
#define BEAM_HH
-#include "proto.hh"
-#include "directional-spanner.hh"
-#include "plist.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 */
-struct Beam: public Directional_spanner {
- PointerList<Stem*> stems;
- /// the slope of the beam in posns / point (dimension)
- Real slope;
-
- /// position of leftmost end of beam
- Real left_pos;
+
+#include "lily-proto.hh"
+#include "lily-guile.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 (urg?)
+
+ elt_properties:
+
+ y-position -- real (position of left edge)
+
+ height -- real (dy)
+
+
+ Read-only
+ =========
+
+ flag-width-function --
+
+ damping -- amount of beam slope damping. (int)
+ should beam slope be damped? 0: no, 1: yes, 100000: horizontal beams
+
+ default-neutral-direction -- which direction to choose if we're in
+ the middle of the staff
+
+ thickness -- weight of beams, in staffspace
+
+ space-function -- function of type multiplicity -> real (in staffspace)
+
+ beamed-stem-shorten --
+
+ height-quants --
+
+ vertical-position-quant-function --
+
+ dir-function --
+ damping -- damping factor (real).
- /* *************** */
-NAME_MEMBERS(Beam);
-
- virtual Interval do_width()const;
- Offset center() const;
- Spanner *do_break_at(PCol *, PCol *) const;
- Beam();
- void add(Stem*);
-
-
- void set_default_dir();
- void do_pre_processing();
- void do_post_processing();
-
- void do_print() const;
- void set_grouping(Rhythmic_grouping def, Rhythmic_grouping current);
- void set_stemlens();
- ~Beam();
+ outer-stem-length-limit -- catch suspect beam slopes, set slope to zero if
+ outer stem is lengthened more than this (in staffspace)
+
+ slope-limit -- set slope to zero if slope is running away steeper than this.
+*/
+class Beam
+{
+public:
+ static int visible_stem_count (Score_element*);
+ static Item* first_visible_stem (Score_element*);
+ static Item* last_visible_stem (Score_element*);
+ static bool has_interface (Score_element*);
+ static void set_interface (Score_element*);
+ static Real rest_collision_callback (Score_element *,Axis);
+ Beam (SCM);
+ static void add_stem (Score_element*,Score_element*);
+ static void set_beaming (Score_element*,Beaming_info_list *);
+ static void set_stemlens (Score_element*);
+ static int get_multiplicity (Score_element*me);
+ static SCM brew_molecule (SCM);
+ static SCM before_line_breaking (SCM);
+ static SCM after_line_breaking (SCM);
+ static Molecule stem_beams (Score_element*,Item *here, Item *next, Item *prev);
private:
- Molecule stem_beams(Stem *here, Stem *next, Stem *prev)const;
- void solve_slope();
- Molecule*brew_molecule_p()const;
+ static Direction get_default_dir (Score_element*);
+ static void set_stem_directions (Score_element*);
+ static void auto_knees (Score_element*);
+ static bool auto_knee (Score_element*,String gap_str, bool interstaff_b);
+ static void set_stem_shorten (Score_element*);
+ static void calc_default_position_and_height (Score_element*,Real* y, Real* dy);
+ static bool suspect_slope_b (Score_element*, Real y, Real dy);
+ static Real calc_slope_damping_f (Score_element*, Real dy);
+ static Real calc_stem_y_f (Score_element*, Item* s, Real y, Real dy);
+ static Real check_stem_length_f (Score_element*, Real y, Real dy);
+ static void set_stem_length (Score_element*, Real y, Real dy);
+ static Real quantise_dy_f (Score_element*, Real dy);
+ static Real quantise_y_f (Score_element*, Real y, Real dy, int quant_dir);
+ static int forced_stem_count (Score_element*);
};
#endif // BEAM_HH