lily/staff-symbol-referencer.cc

   1 /*
   2   staff-symbol-referencer.cc -- implement Staff_symbol_referencer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7  */
   8
   9 #include <math.h>
  10
  11 #include "staff-symbol-referencer.hh"
  12 #include "staff-symbol.hh"
  13 #include "paper-def.hh"
  14 #include "dimension-cache.hh"
  15
  16 Staff_symbol_referencer::Staff_symbol_referencer ()
  17 {
  18   staff_sym_l_ =0;
  19   position_i_ =0;
  20 }
  21
  22 void
  23 Staff_symbol_referencer::do_substitute_element_pointer (Score_element *o, Score_element*n)
  24 {
  25   if (staff_sym_l_ == o)
  26     {
  27       staff_sym_l_ = dynamic_cast<Staff_symbol*> (n);
  28     }
  29 }
  30
  31 int
  32 Staff_symbol_referencer::lines_i () const
  33 {
  34   return (staff_sym_l_) ?  staff_sym_l_->no_lines_i_ : 5;
  35 }
  36
  37 void
  38 Staff_symbol_referencer::set_staff_symbol (Staff_symbol*s)
  39 {
  40   staff_sym_l_ =s;
  41   add_dependency (s);
  42 }
  43
  44 Staff_symbol*
  45 Staff_symbol_referencer::staff_symbol_l () const
  46 {
  47   return staff_sym_l_;
  48 }
  49
  50 Real
  51 Staff_symbol_referencer::staff_line_leading_f () const
  52 {
  53   if (staff_sym_l_)
  54     return  staff_sym_l_->staff_line_leading_f_;
  55   else if (pscore_l_ && paper_l ())
  56     paper_l ()->get_var ("interline");
  57
  58   return 0.0;
  59 }
  60
  61 Real
  62 Staff_symbol_referencer::position_f () const
  63 {
  64   Real p = position_i_;
  65   if (staff_sym_l_ )
  66     {
  67       Graphical_element * c = common_refpoint (staff_sym_l_, Y_AXIS);
  68       Real y = relative_coordinate (c, Y_AXIS) - staff_sym_l_->relative_coordinate (c, Y_AXIS);
  69
  70       p += 2.0 * y / staff_line_leading_f ();
  71     }
  72   return  p;
  73 }
  74
  75
  76
  77 void
  78 Staff_symbol_referencer::do_pre_processing ()
  79 {
  80   translate_axis (position_i_ * staff_line_leading_f () /2.0, Y_AXIS);
  81   position_i_ =0;
  82 }
  83
  84
  85 void
  86 Staff_symbol_referencer::set_position (int p)
  87 {
  88   Real halfspace =  staff_line_leading_f ()* 0.5;
  89
  90   translate_axis (- halfspace * position_f (), Y_AXIS);
  91   if (staff_sym_l_)
  92     translate_axis (halfspace * p, Y_AXIS);
  93   else
  94     position_i_ =   p;
  95 }