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"
20 Spaceable_grob::get_minimum_distances (Grob *me)
22 return me->get_object ("minimum-distances");
25 /*todo: merge code of spring & rod?
28 Spaceable_grob::add_rod (Grob *me, Grob *p, Real d)
30 // printf ("rod %lf\n", d);
35 programming_error ("infinite rod");
37 SCM mins = get_minimum_distances (me);
38 SCM newdist = scm_from_double (d);
39 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
41 SCM dist = scm_car (s);
42 if (scm_car (dist) == p->self_scm ())
44 scm_set_cdr_x (dist, scm_max (scm_cdr (dist),
50 if (Paper_column::get_rank (p) < Paper_column::get_rank (me))
51 programming_error ("Adding reverse rod");
53 mins = scm_cons (scm_cons (p->self_scm (), newdist), mins);
54 me->set_object ("minimum-distances", mins);
58 Spaceable_grob::add_spring (Grob *me, Grob *other,
59 Real distance, Real inverse_strength)
61 if (distance <= 0.0 || inverse_strength < 0.0)
63 programming_error ("adding reverse spring, setting to unit");
65 inverse_strength = 1.0;
68 if (isinf (distance) || isnan (distance)
69 || isnan (inverse_strength))
71 /* strength == INF is possible. It means fixed distance. */
72 programming_error ("insane distance found");
74 inverse_strength = 1.0;
78 SCM mins = me->get_object ("ideal-distances");
79 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
81 Spring_smob *sp = unsmob_spring (scm_car (s));
82 if (sp->other_ == other)
84 programming_error ("already have that spring");
91 spring.inverse_strength_ = inverse_strength;
92 spring.distance_ = distance;
93 spring.other_ = other;
95 SCM ideal = me->get_object ("ideal-distances");
96 ideal = scm_cons (spring.smobbed_copy (), ideal);
97 me->set_object ("ideal-distances", ideal);
101 Spaceable_grob::get_spring (Grob *me, Grob *other, Real *dist, Real *inv_strength)
103 for (SCM s = me->get_object ("ideal-distances");
104 scm_is_pair (s); s = scm_cdr (s))
106 Spring_smob *spring = unsmob_spring (scm_car (s));
107 if (spring && spring->other_ == other)
109 *dist = spring->distance_;
110 *inv_strength = spring->inverse_strength_;
116 Spaceable_grob::remove_interface (Grob *me)
118 me->set_object ("minimum-distances", SCM_EOL);
119 me->set_object ("spacing-wishes", SCM_EOL);
120 me->set_object ("ideal-distances", SCM_EOL);
123 ADD_INTERFACE (Spaceable_grob, "spaceable-grob-interface",
124 "A layout object that takes part in the spacing problem. ",
125 "measure-length spacing-wishes penalty minimum-distances ideal-distances "
126 "keep-inside-line left-neighbors right-neighbors");