2 vertical-align-grav.cc -- implement Vertical_align_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
8 #include "translator-group.hh"
9 #include "axis-group-engraver.hh"
10 #include "paper-column.hh"
11 #include "vertical-align-engraver.hh"
12 #include "axis-align-spanner.hh"
13 #include "axis-group-spanner.hh"
14 #include "span-bar.hh"
16 Vertical_align_engraver::Vertical_align_engraver()
22 Vertical_align_engraver::do_creation_processing()
24 valign_p_ =new Axis_align_spanner;
25 valign_p_->set_axis (Y_AXIS);
26 valign_p_->stacking_dir_ = DOWN;
28 valign_p_->set_bounds(LEFT,get_staff_info().command_pcol_l ());
29 announce_element (Score_element_info (valign_p_ , 0));
33 Vertical_align_engraver::do_removal_processing()
35 SCM dist (get_property ("maxVerticalAlign", 0));
36 if (SCM_NUMBERP(dist))
38 valign_p_->threshold_interval_[BIGGER] = gh_scm2double (dist);
41 dist = get_property ("minVerticalAlign", 0);
42 if (SCM_NUMBERP(dist))
44 valign_p_->threshold_interval_[SMALLER] = gh_scm2double (dist);
47 dist = get_property ("alignmentReference",0);
50 valign_p_->align_dir_ = to_dir (dist);
52 valign_p_->set_bounds(RIGHT,get_staff_info().command_pcol_l ());
53 typeset_element (valign_p_);
59 Vertical_align_engraver::qualifies_b (Score_element_info i) const
62 Translator * t = i.origin_trans_l_arr_[0];
64 int sz = i.origin_trans_l_arr_.size() ;
67 return (sz == 1 && dynamic_cast<Translator_group*> (t))
68 || (sz == 2 && dynamic_cast<Axis_group_engraver*> (t));
71 Axis_group_element * elt = dynamic_cast<Axis_group_element *> (i.elem_l_);
73 return sz > 1 && elt && elt->axes_[0] == Y_AXIS && !elt->parent_l (Y_AXIS);
77 Vertical_align_engraver::acknowledge_element (Score_element_info i)
81 valign_p_->add_element (i.elem_l_);
83 else if (dynamic_cast<Span_bar*>(i.elem_l_) && i.origin_trans_l_arr_.size ())
85 i.elem_l_->add_dependency (valign_p_);
91 ADD_THIS_TRANSLATOR(Vertical_align_engraver);