2 spaceable-grob.cc -- implement Spaceable_grob
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "spaceable-grob.hh"
17 #include "group-interface.hh"
20 Spaceable_grob::get_minimum_distances (Grob*me)
22 return me->get_property ("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);
33 SCM mins = get_minimum_distances (me);
34 SCM newdist = scm_make_real (d);
35 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
37 SCM dist = scm_car (s);
38 if (scm_car (dist) == p->self_scm ())
40 scm_set_cdr_x (dist, scm_max (scm_cdr (dist),
46 mins = scm_cons (scm_cons (p->self_scm (), newdist), mins);
47 me->set_property ("minimum-distances", mins);
51 Spaceable_grob::add_spring (Grob*me, Grob * p, Real d, Real strength)
53 // printf ("dist %lf, str %lf\n", d, strength);
54 if (d <= 0.0 || strength <= 0.0)
56 programming_error ("Adding reverse spring! Setting to unit spring");
61 if (isinf (d) || isnan(d)
65 strength == INF is possible. It means fixed distance.
67 programming_error ("Insane distance found.");
73 SCM mins = me->get_property ("ideal-distances");
74 for (SCM s = mins; scm_is_pair (s); s = scm_cdr (s))
76 Spring_smob * sp = unsmob_spring(scm_car (s));
79 programming_error ("already have that spring");
86 spring.strength_ = strength;
90 Group_interface::add_thing (me, ly_symbol2scm ("ideal-distances"), spring.smobbed_copy ());
95 Spaceable_grob::remove_interface (Grob*me)
97 me->set_property ("minimum-distances" , SCM_EOL);
98 me->set_property ("spacing-wishes", SCM_EOL);
99 me->set_property ("ideal-distances", SCM_EOL);
104 ADD_INTERFACE (Spaceable_grob,"spaceable-grob-interface",
105 "A layout object that takes part in the spacing problem. "
107 "measure-length spacing-wishes penalty minimum-distances ideal-distances "
108 "allow-outside-line left-neighbors right-neighbors");