lily/vertical-align-engraver.cc

   1 /*
   2   vertical-align-grav.cc -- implement Vertical_align_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "translator-group.hh"
  10 #include "axis-group-engraver.hh"
  11 #include "paper-column.hh"
  12 #include "vertical-align-engraver.hh"
  13 #include "axis-align-spanner.hh"
  14 #include "axis-group-spanner.hh"
  15 #include "span-bar.hh"
  16
  17 ADD_THIS_TRANSLATOR (Vertical_align_engraver);
  18
  19 Vertical_align_engraver::Vertical_align_engraver()
  20 {
  21   valign_p_ =0;
  22 }
  23
  24 void
  25 Vertical_align_engraver::do_creation_processing()
  26 {
  27   valign_p_ =new Axis_align_spanner;
  28   valign_p_->set_axis (Y_AXIS);
  29   valign_p_->stacking_dir_ = DOWN;
  30
  31   valign_p_->set_bounds(LEFT,get_staff_info().command_pcol_l ());
  32   announce_element (Score_element_info (valign_p_ , 0));
  33 }
  34
  35 void
  36 Vertical_align_engraver::do_removal_processing()
  37 {
  38   SCM dist (get_property ("maxVerticalAlign", 0));
  39   if (gh_number_p(dist))
  40     {
  41       valign_p_->threshold_interval_[BIGGER]  = gh_scm2double (dist);
  42     }
  43
  44   dist = get_property ("minVerticalAlign", 0);
  45   if (gh_number_p(dist))
  46     {
  47       valign_p_->threshold_interval_[SMALLER]  = gh_scm2double (dist);
  48     }
  49
  50   dist = get_property ("alignmentReference",0);
  51   if (isdir_b (dist))
  52     {
  53       valign_p_->align_dir_ = to_dir (dist);
  54     }
  55   valign_p_->set_bounds(RIGHT,get_staff_info().command_pcol_l ());
  56   typeset_element (valign_p_);
  57   valign_p_ =0;
  58 }
  59
  60
  61 bool
  62 Vertical_align_engraver::qualifies_b (Score_element_info i) const
  63 {
  64   int sz = i.origin_trans_l_arr_.size()  ;
  65
  66
  67   Axis_group_element * elt = dynamic_cast<Axis_group_element *> (i.elem_l_);
  68
  69   return sz > 1 && elt && elt->axes_[0] == Y_AXIS && !elt->parent_l (Y_AXIS);
  70 }
  71
  72 void
  73 Vertical_align_engraver::acknowledge_element (Score_element_info i)
  74 {
  75   if (qualifies_b (i))
  76     {
  77       valign_p_->add_element (i.elem_l_);
  78     }
  79   else if (dynamic_cast<Span_bar*>(i.elem_l_) && i.origin_trans_l_arr_.size ())
  80     {
  81       i.elem_l_->add_dependency (valign_p_);
  82     }
  83 }
  84