2 spaceable-grob.cc -- implement Spaceable_grob
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "spaceable-grob.hh"
15 #include "pointer-group-interface.hh"
17 #include "paper-column.hh"
18 #include "international.hh"
21 Spaceable_grob::get_minimum_distances (Grob *me)
23 return me->get_object ("minimum-distances");
26 /*todo: merge code of spring & rod?
29 Spaceable_grob::add_rod (Grob *me, Grob *p, Real d)
31 // printf ("rod %lf\n", d);
36 programming_error ("infinite rod");
38 SCM mins = get_minimum_distances (me);
39 SCM newdist = scm_from_double (d);
40 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
42 SCM dist = scm_car (s);
43 if (scm_car (dist) == p->self_scm ())
45 scm_set_cdr_x (dist, scm_max (scm_cdr (dist),
51 if (Paper_column::get_rank (p) < Paper_column::get_rank (me))
52 programming_error ("Adding reverse rod");
54 mins = scm_cons (scm_cons (p->self_scm (), newdist), mins);
55 me->set_object ("minimum-distances", mins);
59 Spaceable_grob::add_spring (Grob *me, Grob *other,
60 Real distance, Real inverse_strength)
63 SCM mins = me->get_object ("ideal-distances");
64 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
66 Spring *sp = unsmob_spring (scm_car (s));
67 if (sp->other_ == other)
69 programming_error ("already have that spring");
76 spring.set_inverse_stretch_strength (inverse_strength);
77 spring.set_inverse_compress_strength (inverse_strength);
78 spring.set_distance (distance);
79 spring.other_ = other;
81 SCM ideal = me->get_object ("ideal-distances");
82 ideal = scm_cons (spring.smobbed_copy (), ideal);
83 me->set_object ("ideal-distances", ideal);
87 Spaceable_grob::add_spring (Grob *me, Grob *other, Spring sp)
89 SCM ideal = me->get_object ("ideal-distances");
91 ideal = scm_cons (sp.smobbed_copy (), ideal);
92 me->set_object ("ideal-distances", ideal);
96 Spaceable_grob::get_spring (Grob *this_col, Grob *next_col, Real *dist, Real *inv_strength)
100 for (SCM s = this_col->get_object ("ideal-distances");
101 !spring && scm_is_pair (s);
104 Spring *sp = unsmob_spring (scm_car (s));
106 if (sp && sp->other_ == next_col)
111 programming_error (_f ("No spring between column %d and next one",
112 Paper_column::get_rank (this_col)));
114 *dist = (spring) ? spring->distance () : 5.0;
115 *inv_strength = (spring) ? spring->inverse_stretch_strength () : 1.0;
120 ADD_INTERFACE (Spaceable_grob,
121 "A layout object that takes part in the spacing problem. ",
125 "allow-loose-spacing "