2 break.hh -- declare Break_algorithm
4 source file of the GNU LilyPond music typesetter
6 (c) 1996, 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
13 #include "interval.hh"
14 #include "lily-proto.hh"
18 Statistics for the number of columns calced.
26 void add (Line_of_cols const&l);
30 /** Class representation of an algorithm which decides where to put
31 the column, and where to break lines.
33 TODO: A "parindent", caching of breakpoints
36 class Break_algorithm {
39 Paper_score *pscore_l_;
42 /// search all pcols which are breakable.
43 Line_of_cols find_breaks() const;
45 Array<int> find_break_indices() const;
48 /// helper: solve for the columns in #curline#.
49 void solve_line (Column_x_positions*) const;
51 /// helper: approximate the energyv
52 void approximate_solve_line (Column_x_positions*) const;
54 /// does curline fit on the paper?
55 bool feasible (Line_of_cols) const;
58 Line_spacer* generate_spacing_problem (Line_of_cols, Interval) const;
60 virtual Array<Column_x_positions> do_solve() const=0;
61 virtual void do_set_pscore();
64 Col_stats approx_stats_;
65 Col_stats exact_stats_;
67 Line_spacer* (*get_line_spacer)();
70 void set_pscore (Paper_score*);
72 /// check if the spacing/breaking problem is well-stated
73 void problem_OK() const;
75 Array<Column_x_positions> solve() const;