lily/volta-bracket.cc

   1 /*
   2   volta-bracket.cc -- implement Volta_bracket_interface
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2003 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include <string.h>
  10
  11 #include "box.hh"
  12 #include "warn.hh"
  13 #include "font-interface.hh"
  14 #include "molecule.hh"
  15 #include "paper-column.hh"
  16 #include "paper-def.hh"
  17 #include "text-item.hh"
  18 #include "volta-bracket.hh"
  19 #include "group-interface.hh"
  20 #include "side-position-interface.hh"
  21 #include "directional-element-interface.hh"
  22 #include "lookup.hh"
  23
  24 /*
  25   this is too complicated. Yet another version of side-positioning,
  26   badly implemented.
  27
  28   --
  29
  30   * Should look for system_start_delim to find left edge of staff.
  31
  32 */
  33
  34 MAKE_SCHEME_CALLBACK (Volta_bracket_interface,brew_molecule,1);
  35 SCM
  36 Volta_bracket_interface::brew_molecule (SCM smob)
  37 {
  38   Grob *me = unsmob_grob (smob);
  39   Link_array<Item> bars
  40     = Pointer_group_interface__extract_grobs (me, (Item*)0, "bars");
  41
  42   if (!bars.size ())
  43     return SCM_EOL;
  44
  45   Spanner *orig_span =  dynamic_cast<Spanner*> (me->original_);
  46
  47   bool first_bracket = orig_span && (orig_span->broken_intos_[0] == (Spanner*)me);
  48
  49   bool last_bracket = orig_span && (orig_span->broken_intos_.top () == (Spanner*)me);
  50
  51   bool no_vertical_start = orig_span && !first_bracket;
  52   bool no_vertical_end = orig_span && !last_bracket;
  53   SCM s = me->get_grob_property ("bars");
  54   Grob * endbar =   unsmob_grob (ly_car (s));
  55   SCM glyph = endbar->get_grob_property("glyph");
  56
  57   String str;
  58   if (gh_string_p (glyph))
  59     str = ly_scm2string(glyph);
  60   else
  61     return SCM_EOL;
  62
  63   const char* cs = str.to_str0 ();
  64   no_vertical_end |=
  65     (strcmp(cs,":|")!=0 && strcmp(cs,"|:")!=0 && strcmp(cs,"|.")!=0
  66      && strcmp(cs,":|:")!=0 && strcmp(cs,".|")!=0);
  67
  68   Real staff_thick = me->get_paper ()->get_var ("linethickness");
  69   Real half_space = 0.5;
  70
  71   Item * bound = dynamic_cast<Spanner*> (me)->get_bound (LEFT);
  72
  73   /*
  74     not a start, but really broken in two
  75    */
  76   Real left =0.;
  77   if (bound->break_status_dir () == RIGHT)
  78   {
  79     Paper_column *pc = bound->get_column ();
  80     left = pc->extent (pc, X_AXIS)[RIGHT]   - bound->relative_coordinate (pc, X_AXIS);
  81   }
  82   else
  83   {
  84     /*
  85       the volta spanner is attached to the bar-line, which is moved
  86       to the right. We don't need to compensate for the left edge.
  87     */
  88   }
  89
  90   Real w = dynamic_cast<Spanner*> (me)->spanner_length () - left - half_space;
  91   Real h =  gh_scm2double (me->get_grob_property ("height"));
  92   Real t =  staff_thick * gh_scm2double (me->get_grob_property ("thickness"));
  93
  94
  95   Molecule start,end ;
  96   if (!no_vertical_start)
  97     start = Lookup::line (t, Offset (0,0), Offset (0, h));
  98
  99   if (!no_vertical_end)
 100     end = Lookup::line (t, Offset (w, 0), Offset (w,h));
 101
 102   Molecule mol = Lookup::line (t, Offset (0, h), Offset (w,h));
 103   mol.add_molecule (start);
 104   mol.add_molecule (end);
 105
 106   SCM text = me->get_grob_property ("text");
 107   SCM properties = me->get_property_alist_chain (SCM_EOL);
 108
 109   Molecule num = Text_item::text2molecule (me, text, properties);
 110
 111   mol.add_at_edge (X_AXIS, LEFT, num, - num.extent (X_AXIS).length ()
 112                    - 1.0, 0);
 113   mol.translate_axis (left, X_AXIS);
 114   return mol.smobbed_copy ();
 115 }
 116
 117
 118 void
 119 Volta_bracket_interface::add_bar (Grob *me, Item* b)
 120 {
 121   Pointer_group_interface::add_grob (me, ly_symbol2scm ("bars"), b);
 122   Side_position_interface::add_support (me,b);
 123   add_bound_item (dynamic_cast<Spanner*> (me), b);
 124 }
 125
 126 void
 127 Volta_bracket_interface::add_column (Grob*me, Grob* c)
 128 {
 129   Side_position_interface::add_support (me,c);
 130 }
 131
 132 ADD_INTERFACE (Volta_bracket_interface,"volta-bracket-interface",
 133   "Volta bracket with number",
 134   "bars thickness height");
 135