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 "axis-group-engraver.hh"
10 #include "paper-column.hh"
11 #include "align-interface.hh"
12 #include "span-bar.hh"
13 #include "axis-group-interface.hh"
14 #include "engraver.hh"
17 class Vertical_align_engraver : public Engraver {
19 bool qualifies_b (Score_element_info) const;
21 VIRTUAL_COPY_CONS(Translator);
23 Vertical_align_engraver();
26 virtual void acknowledge_element (Score_element_info);
27 virtual void do_creation_processing();
28 virtual void do_removal_processing();
32 Vertical_align_engraver::Vertical_align_engraver()
38 Vertical_align_engraver::do_creation_processing()
40 valign_p_ =new Spanner; //Axis_align_spanner
41 Align_interface (valign_p_).set_interface ();
42 Align_interface (valign_p_).set_axis (Y_AXIS);
43 valign_p_->set_elt_property ("stacking-dir",
46 valign_p_->set_bound(LEFT,get_staff_info().command_pcol_l ());
47 announce_element (Score_element_info (valign_p_ , 0));
51 Vertical_align_engraver::do_removal_processing()
53 SCM min = get_property ("maxVerticalAlign");
54 SCM max = get_property ("minVerticalAlign");
56 if (gh_number_p (min) || gh_number_p (max))
58 min = gh_number_p (min) ? min : gh_double2scm (0.0);
59 max = gh_number_p (max) ? max : gh_double2scm (infinity_f);
61 valign_p_->set_elt_property ("threshold",
64 valign_p_->set_bound(RIGHT,get_staff_info().command_pcol_l ());
65 typeset_element (valign_p_);
71 Vertical_align_engraver::qualifies_b (Score_element_info i) const
73 int sz = i.origin_trans_l_arr ((Translator*)this).size() ;
76 Axis_group_interface agi(i.elem_l_);
78 return sz > 1 && agi.has_interface_b ()
79 && !i.elem_l_->parent_l (Y_AXIS) && agi.axis_b (Y_AXIS);
83 Vertical_align_engraver::acknowledge_element (Score_element_info i)
87 Align_interface(valign_p_).add_element (i.elem_l_);
92 should junk this, but (crossstaff?) Beam doesn't have a clue yet
96 Add make sure spanbars (whose size depends on vertical alignment)
97 depend on the vertical alignment element
99 else if (dynamic_cast<Span_bar*>(i.elem_l_) && i.origin_trans_l_arr (this).size ())
101 i.elem_l_->add_dependency (valign_p_);
108 ADD_THIS_TRANSLATOR(Vertical_align_engraver);