lily/span-bar.cc

   1 /*
   2   span-bar.cc -- implement Span_bar
   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 "span-bar.hh"
  10 #include "lookup.hh"
  11 #include "dimensions.hh"
  12 #include "paper-def.hh"
  13 #include "molecule.hh"
  14 #include "warn.hh"
  15 #include "axis-group-interface.hh"
  16 #include "group-interface.hh"
  17 #include "score-element.hh"
  18 #include "bar.hh"
  19
  20 void
  21 Span_bar::add_bar (Score_element*me, Score_element*b)
  22 {
  23   Pointer_group_interface gi (me);
  24   gi.add_element (b);
  25
  26   me->add_dependency (b);
  27 }
  28
  29 Interval
  30 Span_bar::width_callback (Score_element *se, Axis )
  31 {
  32   String gl = ly_scm2string (se->get_elt_property ("glyph"));
  33
  34   /*
  35     urg.
  36    */
  37   Molecule m = Bar::compound_barline (se, gl, 40 PT);
  38
  39   return m.extent (X_AXIS);
  40 }
  41
  42 MAKE_SCHEME_CALLBACK(Span_bar,before_line_breaking);
  43 SCM
  44 Span_bar::before_line_breaking (SCM smob)
  45 {
  46   Bar::before_line_breaking (smob);
  47
  48   evaluate_empty (unsmob_element (smob));
  49
  50   return SCM_UNDEFINED;
  51 }
  52
  53 Real
  54 Span_bar::center_on_spanned_callback (Score_element * me, Axis a)
  55 {
  56   assert (a == Y_AXIS);
  57   Interval i (get_spanned_interval (me));
  58
  59   /*
  60     Bar::brew_molecule delivers a barline of y-extent (-h/2,h/2), so
  61     we have to translate ourselves to be in the center of the
  62     interval that we span.  */
  63
  64   return i.center ();
  65 }
  66
  67 void
  68 Span_bar::evaluate_empty (Score_element*me)
  69 {
  70   if (!gh_pair_p (me->get_elt_property ("elements")))
  71     {
  72       me->suicide ();
  73     }
  74
  75   SCM gl = me->get_elt_property ("glyph");
  76   if (!gh_string_p (gl))
  77     {
  78       me->suicide ();
  79       return ;
  80     }
  81   else {
  82     String type_str = ly_scm2string (gl);
  83     String orig = type_str;
  84     if (type_str == "|:")
  85       {
  86         type_str= ".|";
  87       }
  88     else if (type_str== ":|")
  89       {
  90         type_str= "|.";
  91       }
  92     else if (type_str== ":|:")
  93       {
  94         type_str= ".|.";
  95       }
  96     if (orig != type_str)
  97       me->set_elt_property ("glyph", ly_str02scm (type_str.ch_C()));
  98   }
  99 }
 100
 101 Interval
 102 Span_bar::get_spanned_interval (Score_element*me)
 103 {
 104   return Axis_group_interface::group_extent_callback (me, Y_AXIS);
 105 }
 106
 107
 108 MAKE_SCHEME_CALLBACK(Span_bar,get_bar_size);
 109 SCM
 110 Span_bar::get_bar_size (SCM smob)
 111 {
 112   Score_element* me =  unsmob_element (smob);
 113   Interval iv (get_spanned_interval (me));
 114   if (iv.empty_b ())
 115     {
 116       programming_error("Huh? My children deflated (FIXME)");
 117       iv = Interval (0,0);
 118     }
 119   return gh_double2scm (iv.length ());
 120 }
 121 void
 122 Span_bar::set_interface (Score_element *me)
 123 {
 124   Bar::set_interface (me);
 125
 126   Pointer_group_interface(me).set_interface ();
 127   me->set_extent_callback (width_callback, X_AXIS);
 128   me->add_offset_callback (center_on_spanned_callback, Y_AXIS);
 129   me->set_interface (ly_symbol2scm ("span-bar-interface"));
 130   me->set_extent_callback (0, Y_AXIS);
 131 }
 132
 133 bool
 134 Span_bar::has_interface (Score_element*m)
 135 {
 136   return m && m->has_interface (ly_symbol2scm ("span-bar-interface"));
 137 }