lily/span-bar-engraver.cc

   1 /*
   2   span-bar-grav.cc -- implement Span_bar_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #include "lily-guile.hh"
  11 #include "bar.hh"
  12 #include "item.hh"
  13 #include "span-bar.hh"
  14 #include "engraver.hh"
  15
  16
  17 /**
  18
  19   Make bars that span multiple "staffs". Catch bars, and span a
  20   Span_bar over them if we find more than 2 bars.  Vertical alignment
  21   of staffs changes the appearance of spanbars.  It is up to the
  22   aligner (Vertical_align_engraver, in this case, to add extra
  23   dependencies to the spanbars.
  24
  25   */
  26 class Span_bar_engraver : public Engraver
  27 {
  28   Item * spanbar_p_;
  29   Link_array<Item> bar_l_arr_;
  30
  31 public:
  32   VIRTUAL_COPY_CONS(Translator);
  33   Span_bar_engraver();
  34 protected:
  35   virtual void acknowledge_element (Score_element_info);
  36   virtual void do_pre_move_processing();
  37
  38 };
  39
  40
  41 Span_bar_engraver::Span_bar_engraver()
  42 {
  43   spanbar_p_ =0;
  44 }
  45
  46
  47
  48 void
  49 Span_bar_engraver::acknowledge_element (Score_element_info i)
  50 {
  51   int depth = i.origin_trans_l_arr (this).size();
  52   if (depth > 1
  53       && Bar::has_interface (i.elem_l_))
  54     {
  55       Item * it = dynamic_cast<Item*>(i.elem_l_);
  56       bar_l_arr_.push (it);
  57
  58       if (bar_l_arr_.size() >= 2 && !spanbar_p_)
  59         {
  60           spanbar_p_ = new Item (get_property ("basicSpanBarProperties"));
  61           Span_bar::set_interface (spanbar_p_);
  62           spanbar_p_->set_elt_property ("glyph", bar_l_arr_[0]->get_elt_property ("glyph"));
  63           spanbar_p_->set_elt_property ("visibility-lambda",
  64                                         bar_l_arr_[0]->get_elt_property ("visibility-lambda"));
  65
  66           spanbar_p_->set_parent (bar_l_arr_[0], Y_AXIS);
  67           spanbar_p_->set_parent (bar_l_arr_[0], X_AXIS);
  68
  69           announce_element (Score_element_info (spanbar_p_,0));
  70         }
  71     }
  72 }
  73 void
  74 Span_bar_engraver::do_pre_move_processing()
  75 {
  76   if (spanbar_p_)
  77     {
  78       for (int i=0; i < bar_l_arr_.size() ; i++)
  79         Span_bar::add_bar( spanbar_p_,bar_l_arr_[i]);
  80       typeset_element (spanbar_p_);
  81       spanbar_p_ =0;
  82     }
  83   bar_l_arr_.set_size (0);
  84 }
  85
  86
  87
  88 ADD_THIS_TRANSLATOR(Span_bar_engraver);
  89
  90
  91