2 spaceable-grob.cc -- implement Spaceable_grob
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2006 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)
62 if (distance <= 0.0 || inverse_strength < 0.0)
64 programming_error ("adding reverse spring, setting to unit");
66 inverse_strength = 1.0;
69 if (isinf (distance) || isnan (distance)
70 || isnan (inverse_strength))
72 /* strength == INF is possible. It means fixed distance. */
73 programming_error ("insane distance found");
75 inverse_strength = 1.0;
79 SCM mins = me->get_object ("ideal-distances");
80 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
82 Spring_smob *sp = unsmob_spring (scm_car (s));
83 if (sp->other_ == other)
85 programming_error ("already have that spring");
92 spring.inverse_strength_ = inverse_strength;
93 spring.distance_ = distance;
94 spring.other_ = other;
96 SCM ideal = me->get_object ("ideal-distances");
97 ideal = scm_cons (spring.smobbed_copy (), ideal);
98 me->set_object ("ideal-distances", ideal);
102 Spaceable_grob::get_spring (Grob *this_col, Grob *next_col, Real *dist, Real *inv_strength)
104 Spring_smob *spring = 0;
106 for (SCM s = this_col->get_object ("ideal-distances");
107 !spring && scm_is_pair (s);
110 Spring_smob *sp = unsmob_spring (scm_car (s));
112 if (sp && sp->other_ == next_col)
117 programming_error (_f ("No spring between column %d and next one",
118 Paper_column::get_rank (this_col)));
120 *dist = (spring) ? spring->distance_ : 5.0;
121 *inv_strength = (spring) ? spring->inverse_strength_ : 1.0;
126 Spaceable_grob::remove_interface (Grob *me)
128 me->set_object ("minimum-distances", SCM_EOL);
129 me->set_object ("spacing-wishes", SCM_EOL);
130 me->set_object ("ideal-distances", SCM_EOL);
133 ADD_INTERFACE (Spaceable_grob,
134 "A layout object that takes part in the spacing problem. ",
138 "allow-loose-spacing "