release: 1.3.44

[lilypond.git] / lily / include / beam.hh

diff --git a/lily/include/beam.hh b/lily/include/beam.hh
index 8eb2f148b557b2af4a50357362d6f473aa1ea9b8..768d07aaa75c311e71c229467b122fe6a115f417 100644 (file)
--- a/lily/include/beam.hh
+++ b/lily/include/beam.hh
@@ -1,50 +1,70 @@
 /*
-  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;
-   
-
-    /* *************** */
-NAME_MEMBERS(Beam);
-    
-    virtual Interval 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();
 
+#include "lily-proto.hh"
+#include "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 (urg?)
+
+   elt_properties:
+   y-position: real  (position of left edge)
+   height: real  (dy)
+
+   damping: amount of beam slope damping. (int)
+   should beam slope be damped? 0: no, 1: yes, 100000: horizontal beams 
+*/
+class Beam : public Spanner
+{
+public:
+
+  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;
+
+  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);
+
+  int get_multiplicity () const;
+
+protected:
+ 
+  virtual void before_line_breaking ();
+  virtual void after_line_breaking ();
+  virtual Molecule do_brew_molecule () const;
+
+  Molecule stem_beams (Stem *here, Stem *next, Stem *prev) const;
 private:
-    Molecule stem_beams(Stem *here, Stem *next, Stem *prev)const;
-    void solve_slope();
-    Molecule*brew_molecule_p()const;
+  Direction get_default_dir () const;
+  void set_stem_directions ();
+  void auto_knees ();
+  bool auto_knee (String gap_str, bool interstaff_b);
+  void set_stem_shorten ();
+  void calc_default_position_and_height (Real* y, Real* dy) const;
+  bool suspect_slope_b (Real y, Real dy) const;
+  Real calc_slope_damping_f (Real dy) const;
+  Real calc_stem_y_f (Stem* s, Real y, Real dy) const;
+  Real check_stem_length_f (Real y, Real dy) const;
+  void set_stem_length (Real y, Real dy);
+  Real quantise_dy_f (Real dy) const;
+  Real quantise_y_f (Real y, Real dy, int quant_dir);
+  int forced_stem_count () const;
 };
 
 #endif // BEAM_HH