2 break-algorithm.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"
15 #include "column-x-positions.hh"
18 /** Class representation of an algorithm which decides where to put
19 the column, and where to break lines.
21 TODO: A "parindent", caching of breakpoints
24 class Break_algorithm {
27 Paper_score *pscore_l_;
30 /// search all pcols which are breakable.
31 Line_of_cols find_breaks() const;
33 Array<int> find_break_indices() const;
36 /// helper: solve for the columns in #curline#.
37 void solve_line (Column_x_positions*) const;
39 /// helper: approximate the energyv
40 void approximate_solve_line (Column_x_positions*) const;
42 /// does curline fit on the paper?
43 bool feasible (Line_of_cols) const;
46 Simple_spacer* generate_spacing_problem (Line_of_cols, Interval) const;
48 virtual Array<Column_x_positions> do_solve() const=0;
49 virtual void do_set_pscore();
53 Simple_spacer* (*get_line_spacer)();
56 void set_pscore (Paper_score*);
58 /// check if the spacing/breaking problem is well-stated
59 void problem_OK() const;
61 Array<Column_x_positions> solve() const;