2 vertical-align-grav.cc -- implement Vertical_align_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 #include "translator-group.hh"
9 #include "paper-column.hh"
10 #include "align-interface.hh"
11 #include "span-bar.hh"
12 #include "axis-group-interface.hh"
13 #include "engraver.hh"
16 class Vertical_align_engraver : public Engraver
19 bool qualifies_b (Score_element_info) const;
21 VIRTUAL_COPY_CONS(Translator);
22 Vertical_align_engraver();
24 virtual void acknowledge_element (Score_element_info);
25 virtual void do_creation_processing();
26 virtual void do_removal_processing();
29 Vertical_align_engraver::Vertical_align_engraver()
35 Vertical_align_engraver::do_creation_processing()
37 valign_p_ =new Spanner (SCM_EOL); // todo -> basic props
38 Align_interface::set_interface (valign_p_);
39 Align_interface::set_axis (valign_p_,Y_AXIS);
40 valign_p_->set_elt_property ("stacking-dir",
43 valign_p_->set_bound(LEFT,unsmob_element (get_property ("currentCommandColumn")));
44 announce_element (valign_p_ , 0);
48 Vertical_align_engraver::do_removal_processing()
50 SCM min = get_property ("maxVerticalAlign");
51 SCM max = get_property ("minVerticalAlign");
53 if (gh_number_p (min) || gh_number_p (max))
55 min = gh_number_p (min) ? min : gh_double2scm (0.0);
56 max = gh_number_p (max) ? max : gh_double2scm (infinity_f);
58 valign_p_->set_elt_property ("threshold",
61 valign_p_->set_bound(RIGHT,unsmob_element (get_property ("currentCommandColumn")));
62 typeset_element (valign_p_);
68 Vertical_align_engraver::qualifies_b (Score_element_info i) const
70 int sz = i.origin_trans_l_arr ((Translator*)this).size() ;
72 return sz > 1 && Axis_group_interface::has_interface (i.elem_l_)
73 && !i.elem_l_->parent_l (Y_AXIS) && Axis_group_interface::axis_b (i.elem_l_, Y_AXIS);
77 Vertical_align_engraver::acknowledge_element (Score_element_info i)
81 Align_interface::add_element (valign_p_,i.elem_l_);
85 ADD_THIS_TRANSLATOR(Vertical_align_engraver);