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_symbol_l_ =0;
  19   position_f_ =0;
  20 }
  21
  22 void
  23 Staff_symbol_referencer::do_substitute_element_pointer (Score_element *o,
  24                                                         Score_element*n)
  25 {
  26   if (staff_symbol_l_ == o)
  27     {
  28       staff_symbol_l_ = dynamic_cast<Staff_symbol*> (n);
  29     }
  30 }
  31
  32 int
  33 Staff_symbol_referencer::lines_i () const
  34 {
  35   return (staff_symbol_l_) ?  staff_symbol_l_->no_lines_i_ : 5;
  36 }
  37
  38 void
  39 Staff_symbol_referencer::set_staff_symbol (Staff_symbol*s)
  40 {
  41   staff_symbol_l_ =s;
  42   add_dependency (s);
  43 }
  44
  45 Staff_symbol*
  46 Staff_symbol_referencer::staff_symbol_l () const
  47 {
  48   return staff_symbol_l_;
  49 }
  50
  51 Real
  52 Staff_symbol_referencer::staff_line_leading_f () const
  53 {
  54   if (staff_symbol_l_)
  55     return  staff_symbol_l_->staff_line_leading_f_;
  56   else if (pscore_l_ && paper_l ())
  57     paper_l ()->get_var ("interline");
  58
  59   return 0.0;
  60 }
  61
  62 Real
  63 Staff_symbol_referencer::position_f () const
  64 {
  65   Real p = position_f_;
  66   if (staff_symbol_l_ )
  67     {
  68       Graphical_element * c = common_refpoint (staff_symbol_l_, Y_AXIS);
  69       Real y = relative_coordinate (c, Y_AXIS) - staff_symbol_l_->relative_coordinate (c, Y_AXIS);
  70
  71       p += 2.0 * y / staff_line_leading_f ();
  72     }
  73   return  p;
  74 }
  75
  76
  77
  78 /*
  79   should use offset callback!
  80  */
  81 void
  82 Staff_symbol_referencer::do_pre_processing ()
  83 {
  84   translate_axis (position_f_ * staff_line_leading_f () /2.0, Y_AXIS);
  85   position_f_ =0;
  86 }
  87
  88
  89 void
  90 Staff_symbol_referencer::set_position (Real p)
  91 {
  92   Real halfspace =  staff_line_leading_f ()* 0.5;
  93
  94   translate_axis (- halfspace * position_f (), Y_AXIS);
  95   if (staff_symbol_l_)
  96     translate_axis (halfspace * p, Y_AXIS);
  97   else
  98     position_f_ =   p;
  99 }
 100