2 align-interface.cc -- implement Align_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "align-interface.hh"
12 #include "group-interface.hh"
13 #include "axis-group-interface.hh"
14 #include "paper-def.hh"
17 This callback is set in the children of the align element. It does
18 not compute anything, but a side effect of a->do_side_processing ()
19 is that the elements are placed correctly. */
20 MAKE_SCHEME_CALLBACK(Align_interface,alignment_callback,2);
22 Align_interface::alignment_callback (SCM element_smob, SCM axis)
24 Grob * me = unsmob_element (element_smob);
25 Axis ax = (Axis )gh_scm2int (axis);
26 Grob * par = me->parent_l (ax);
27 if (par && !to_boolean (par->get_grob_property ("alignment-done")))
29 Align_interface::do_side_processing (par, ax);
31 return gh_double2scm (0.0);
36 Hairy function to put elements where they should be. Can be tweaked
37 from the outside by setting minimum-space and extra-space in its
40 Align_interface::do_side_processing (Grob * me, Axis a)
42 me->set_grob_property ("alignment-done", SCM_BOOL_T);
44 SCM d = me->get_grob_property ("stacking-dir");
45 Direction stacking_dir = gh_number_p(d) ? to_dir (d) : CENTER;
52 Link_array<Grob> elems;
53 Link_array<Grob> all_elts
54 = Pointer_group_interface__extract_elements ( me, (Grob*) 0, "elements");
55 for (int i=0; i < all_elts.size(); i++)
57 Interval y = all_elts[i]->extent(me, a);
60 Grob *e =dynamic_cast<Grob*>(all_elts[i]);
62 // todo: fucks up if item both in Halign & Valign.
63 SCM min_dims = e->remove_grob_property ("minimum-space");
64 if (gh_pair_p (min_dims) &&
65 gh_number_p (gh_car (min_dims))
66 && gh_number_p (gh_cdr (min_dims)))
68 y.unite (ly_scm2interval (min_dims));
72 SCM extra_dims = e->remove_grob_property ("extra-space");
73 if (gh_pair_p (extra_dims) &&
74 gh_number_p (gh_car (extra_dims))
75 && gh_number_p (gh_cdr (extra_dims)))
77 y[LEFT] += gh_scm2double (gh_car (extra_dims));
78 y[RIGHT] += gh_scm2double (gh_cdr (extra_dims));
87 Interval threshold = Interval (0, Interval::infinity ());
88 SCM thr = me->get_grob_property ("threshold");
92 threshold[SMALLER] = ss *gh_scm2double (gh_car (thr));
93 threshold[BIGGER] = ss * gh_scm2double (gh_cdr (thr));
97 for (int j=0 ; j < elems.size(); j++)
99 Real dy = - stacking_dir * dims[j][-stacking_dir];
101 dy += stacking_dir * dims[j-1][stacking_dir];
105 dy = (dy >? threshold[SMALLER] )
106 <? threshold[BIGGER];
109 where_f += stacking_dir * dy;
110 elems[j]->translate_axis (where_f, a);
116 Align_interface::axis (Grob*me)
118 return Axis (gh_scm2int (gh_car (me->get_grob_property ("axes"))));
123 should use generic Scm funcs.
126 Align_interface::get_count (Grob*me,Grob*s)
128 SCM e = me->get_grob_property ("elements");
130 while (gh_pair_p (e))
132 if (gh_car (e) == s->self_scm ())
141 Align_interface::add_element (Grob*me,Grob* s)
143 s->add_offset_callback (Align_interface::alignment_callback_proc, Align_interface::axis (me));
144 Axis_group_interface::add_element (me, s);
149 Align_interface::set_interface (Grob*me)
151 me->set_interface (ly_symbol2scm ("align-interface"));
153 Axis_group_interface::set_interface (me);
157 Align_interface::set_axis (Grob*me,Axis a)
159 Axis_group_interface::set_axes (me, a,a );
163 Align_interface::has_interface (Grob*me)
165 return me && me->has_interface (ly_symbol2scm ("align-interface"));