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 #include "dimension-cache.hh"
  10 #include "lily-guile.hh"
  11 #include "span-bar.hh"
  12 #include "engraver.hh"
  13
  14 /**
  15
  16   Make bars that span multiple "staffs". Catch bars, and span a
  17   Span_bar over them if we find more than 2 bars.  Vertical alignment
  18   of staffs changes the appearance of spanbars.  It is up to the
  19   aligner (Vertical_align_engraver, in this case, to add extra
  20   dependencies to the spanbars.
  21
  22   */
  23 class Span_bar_engraver : public Engraver
  24 {
  25   Span_bar * spanbar_p_;
  26   Link_array<Bar> bar_l_arr_;
  27
  28 public:
  29   VIRTUAL_COPY_CONS(Translator);
  30   Span_bar_engraver();
  31 protected:
  32   virtual void acknowledge_element (Score_element_info);
  33   virtual void do_pre_move_processing();
  34   virtual Span_bar* get_span_bar_p(SCM) const;
  35 };
  36
  37
  38 Span_bar_engraver::Span_bar_engraver()
  39 {
  40   spanbar_p_ =0;
  41 }
  42
  43 Span_bar*
  44 Span_bar_engraver::get_span_bar_p(SCM s) const
  45 {
  46   Span_bar * sp= new Span_bar (s);
  47   return sp;
  48 }
  49
  50
  51 void
  52 Span_bar_engraver::acknowledge_element (Score_element_info i)
  53 {
  54   int depth = i.origin_trans_l_arr (this).size();
  55   if (depth > 1
  56       && dynamic_cast<Bar *> (i.elem_l_))
  57     {
  58       bar_l_arr_.push (dynamic_cast<Bar *> (i.elem_l_));
  59
  60       if (bar_l_arr_.size() >= 2 && !spanbar_p_)
  61         {
  62           spanbar_p_ = get_span_bar_p (get_property ("basicSpanBarProperties"));
  63           spanbar_p_->set_elt_property ("glyph", bar_l_arr_[0]->get_elt_property ("glyph"));
  64           spanbar_p_->set_elt_property ("visibility-lambda",
  65                                         bar_l_arr_[0]->get_elt_property ("visibility-lambda"));
  66
  67           spanbar_p_->set_parent (bar_l_arr_[0], Y_AXIS);
  68           spanbar_p_->set_parent (bar_l_arr_[0], X_AXIS);
  69
  70           announce_element (Score_element_info (spanbar_p_,0));
  71         }
  72     }
  73 }
  74 void
  75 Span_bar_engraver::do_pre_move_processing()
  76 {
  77   if (spanbar_p_)
  78     {
  79       for (int i=0; i < bar_l_arr_.size() ; i++)
  80         spanbar_p_->add_bar (bar_l_arr_[i]);
  81       typeset_element (spanbar_p_);
  82       spanbar_p_ =0;
  83     }
  84   bar_l_arr_.set_size (0);
  85 }
  86
  87
  88
  89 ADD_THIS_TRANSLATOR(Span_bar_engraver);
  90
  91
  92