2 spaceable-grob.cc -- implement Spaceable_grob
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "spaceable-grob.hh"
16 #include "group-interface.hh"
19 Spaceable_grob::get_minimum_distances (Grob *me)
21 return me->get_property ("minimum-distances");
24 /*todo: merge code of spring & rod?
27 Spaceable_grob::add_rod (Grob *me, Grob *p, Real d)
29 // printf ("rod %lf\n", d);
32 SCM mins = get_minimum_distances (me);
33 SCM newdist = scm_make_real (d);
34 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
36 SCM dist = scm_car (s);
37 if (scm_car (dist) == p->self_scm ())
39 scm_set_cdr_x (dist, scm_max (scm_cdr (dist),
45 mins = scm_cons (scm_cons (p->self_scm (), newdist), mins);
46 me->set_property ("minimum-distances", mins);
50 Spaceable_grob::add_spring (Grob *me, Grob *p, Real d, Real strength)
52 // printf ("dist %lf, str %lf\n", d, strength);
53 if (d <= 0.0 || strength <= 0.0)
55 programming_error ("Adding reverse spring! Setting to unit spring");
60 if (isinf (d) || isnan (d)
64 strength == INF is possible. It means fixed distance.
66 programming_error ("Insane distance found.");
72 SCM mins = me->get_property ("ideal-distances");
73 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
75 Spring_smob *sp = unsmob_spring (scm_car (s));
78 programming_error ("already have that spring");
85 spring.strength_ = strength;
89 Group_interface::add_thing (me, ly_symbol2scm ("ideal-distances"), spring.smobbed_copy ());
93 Spaceable_grob::remove_interface (Grob *me)
95 me->set_property ("minimum-distances", SCM_EOL);
96 me->set_property ("spacing-wishes", SCM_EOL);
97 me->set_property ("ideal-distances", SCM_EOL);
100 ADD_INTERFACE (Spaceable_grob, "spaceable-grob-interface",
101 "A layout object that takes part in the spacing problem. ",
102 "measure-length spacing-wishes penalty minimum-distances ideal-distances "
103 "allow-outside-line left-neighbors right-neighbors");