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 "score-element.hh"
13 #include "group-interface.hh"
14 #include "axis-group-interface.hh"
15 #include "paper-def.hh"
18 This callback is set in the children of the align element. It does
19 not compute anything, but a side effect of a->do_side_processing ()
20 is that the elements are placed correctly. */
22 Align_interface::alignment_callback (Score_element *sc, Axis ax)
24 Score_element * par = sc->parent_l (ax);
25 if (par && !to_boolean (par->get_elt_property ("alignment-done")))
27 Align_interface::do_side_processing (par, ax);
34 Hairy function to put elements where they should be. Can be tweaked
35 from the outside by setting minimum-space and extra-space in its
38 Align_interface::do_side_processing (Score_element * me, Axis a)
40 me->set_elt_property ("alignment-done", SCM_BOOL_T);
42 SCM d = me->get_elt_property ("stacking-dir");
43 Direction stacking_dir = gh_number_p(d) ? to_dir (d) : CENTER;
50 Link_array<Score_element> elems;
51 Link_array<Score_element> all_elts
52 = Pointer_group_interface__extract_elements ( me, (Score_element*) 0, "elements");
53 for (int i=0; i < all_elts.size(); i++)
55 Interval y = all_elts[i]->extent(a) + all_elts[i]->relative_coordinate (me, a);
58 Score_element *e =dynamic_cast<Score_element*>(all_elts[i]);
60 // todo: fucks up if item both in Halign & Valign.
61 SCM min_dims = e->remove_elt_property ("minimum-space");
62 if (gh_pair_p (min_dims) &&
63 gh_number_p (gh_car (min_dims))
64 && gh_number_p (gh_cdr (min_dims)))
66 y.unite (Interval (gh_scm2double (gh_car (min_dims)),
67 gh_scm2double (gh_cdr (min_dims))));
70 SCM extra_dims = e->remove_elt_property ("extra-space");
71 if (gh_pair_p (extra_dims) &&
72 gh_number_p (gh_car (extra_dims))
73 && gh_number_p (gh_cdr (extra_dims)))
75 y[LEFT] += gh_scm2double (gh_car (extra_dims));
76 y[RIGHT] += gh_scm2double (gh_cdr (extra_dims));
85 Interval threshold = Interval (0, Interval::infinity ());
86 SCM thr = me->get_elt_property ("threshold");
89 Real ss = me->paper_l ()-> get_var ("staffspace");
90 threshold[SMALLER] = ss *gh_scm2double (gh_car (thr));
91 threshold[BIGGER] = ss * gh_scm2double (gh_cdr (thr));
95 for (int i=0 ; i < elems.size(); i++)
97 Real dy = - stacking_dir * dims[i][-stacking_dir];
99 dy += stacking_dir * dims[i-1][stacking_dir];
103 dy = (dy >? threshold[SMALLER] )
104 <? threshold[BIGGER];
107 where_f += stacking_dir * dy;
108 elems[i]->translate_axis (where_f, a);
114 Align_interface::axis (Score_element*me)
116 return Axis (gh_scm2int (gh_car (me->get_elt_property ("axes"))));
121 should use generic Scm funcs.
124 Align_interface::get_count (Score_element*me,Score_element*s)
126 SCM e = me->get_elt_property ("elements");
128 while (gh_pair_p (e))
130 if (gh_car (e) == s->self_scm ())
139 Align_interface::add_element (Score_element*me,Score_element* s)
141 s->add_offset_callback (alignment_callback, Align_interface::axis (me));
142 Axis_group_interface::add_element (me, s);
147 Align_interface::set_interface (Score_element*me)
149 me->set_interface (ly_symbol2scm ("align-interface"));
151 Axis_group_interface::set_interface (me);
155 Align_interface::set_axis (Score_element*me,Axis a)
157 Axis_group_interface::set_axes (me, a,a );
161 Align_interface::has_interface (Score_element*me)
163 return me && me->has_interface (ly_symbol2scm ("align-interface"));