-/*
+/*
simple-spacer.hh -- declare Simple_spacer
-
+
source file of the GNU LilyPond music typesetter
-
- (c) 1999--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
-
- */
+
+ (c) 1999--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+*/
#ifndef SIMPLE_SPACER_HH
#define SIMPLE_SPACER_HH
#include "parray.hh"
#include "lily-proto.hh"
-
+#include "smobs.hh"
struct Spring_description
{
- Real ideal_f_;
- Real hooke_f_;
- bool active_b_;
-
- Real block_force_f_;
+ Real ideal_;
+ Real inverse_hooke_;
+ bool is_active_;
+ Real block_force_;
Real length (Real force) const;
Spring_description ();
- bool sane_b () const;
+ bool is_sane () const;
};
-/**
- A simple spacing constraint solver. The approach:
-
- Stretch the line uniformly until none of the constraints (rods)
- block. It then is very wide.
-
-
- Compress until the next constraint blocks,
-
- Mark the springs over the constrained part to be non-active.
-
- Repeat with the smaller set of non-active constraints, until all
- constraints blocked, or until the line is as short as desired.
-
- This is much simpler, and much much faster than full scale
- Constrained QP. On the other hand, a situation like this will not
- be typeset as dense as possible, because
-
- c4 c4 c4 c4
- veryveryverylongsyllable2 veryveryverylongsyllable2
- " "4 veryveryverylongsyllable2 syllable4
-
-
- can be further compressed to
-
-
- c4 c4 c4 c4
- veryveryverylongsyllable2 veryveryverylongsyllable2
- " "4 veryveryverylongsyllable2 syllable4
-
-
- Perhaps this is not a bad thing, because the 1st looks better anyway. */
-struct Simple_spacer
+class Simple_spacer
{
+public:
Array<Spring_description> springs_;
-
- Real force_f_;
- Real indent_f_;
- Real line_len_f_;
- Real default_space_f_;
-
+ Real force_;
+ Real indent_;
+ Real line_len_;
+ Real default_space_;
+ int active_count_;
Simple_spacer ();
-
- void solve (Column_x_positions *) const;
- void add_columns (Link_array<Paper_column>);
+
void my_solve_linelen ();
void my_solve_natural_len ();
Real active_springs_stiffness () const;
Real range_stiffness (int, int) const;
void add_rod (int l, int r, Real dist);
- Real range_ideal_len (int l, int r)const;
+ void add_spring (Real, Real);
+ Real range_ideal_len (int l, int r) const;
Real active_blocking_force ()const;
Real configuration_length ()const;
void set_active_states ();
- bool active_b () const;
+ bool is_active () const;
+
+ DECLARE_SIMPLE_SMOBS (Simple_spacer,);
+};
+
+struct Simple_spacer_wrapper
+{
+ Simple_spacer *spacer_;
+ Link_array<Grob> spaced_cols_;
+ Link_array<Grob> loose_cols_;
+
+ Simple_spacer_wrapper ();
+ void add_columns (Link_array<Grob> const &);
+ void solve (Column_x_positions *, bool);
+ ~Simple_spacer_wrapper ();
+private:
+ Simple_spacer_wrapper (Simple_spacer_wrapper const &);
};
#endif /* SIMPLE_SPACER_HH */