lily/volta-spanner.cc

   1 /*
   2   volta-spanner.cc -- implement Volta_spanner
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9
  10 #include "box.hh"
  11 #include "debug.hh"
  12 #include "font-interface.hh"
  13 #include "molecule.hh"
  14 #include "paper-column.hh"
  15 #include "paper-def.hh"
  16 #include "text-item.hh"
  17 #include "volta-spanner.hh"
  18 #include "group-interface.hh"
  19 #include "side-position-interface.hh"
  20 #include "directional-element-interface.hh"
  21
  22
  23 void
  24 Volta_spanner::set_interface (Grob*)
  25 {
  26 }
  27
  28 /*
  29   this is too complicated. Yet another version of side-positioning,
  30   badly implemented.
  31
  32   --
  33
  34   * Should look for system_start_delim to find left edge of staff.
  35
  36 */
  37
  38 MAKE_SCHEME_CALLBACK (Volta_spanner,brew_molecule,1);
  39 SCM
  40 Volta_spanner::brew_molecule (SCM smob)
  41 {
  42   Grob *me = unsmob_grob (smob);
  43   Link_array<Item> bar_arr
  44     = Pointer_group_interface__extract_elements (me, (Item*)0, "bars");
  45
  46   if (!bar_arr.size ())
  47     return SCM_EOL;
  48
  49   bool no_vertical_start = false;
  50   bool no_vertical_end = to_boolean (me->get_grob_property ("last-volta"));
  51   Spanner *orig_span =  dynamic_cast<Spanner*> (me->original_l_);
  52
  53   bool first_bracket = orig_span && (orig_span->broken_into_l_arr_[0] == (Spanner*)me);
  54
  55   bool last_bracket = orig_span && (orig_span->broken_into_l_arr_.top () == (Spanner*)me);
  56
  57   no_vertical_start = orig_span && !first_bracket;
  58   no_vertical_end = orig_span && !last_bracket;
  59
  60   Real staff_thick = me->paper_l ()->get_var ("stafflinethickness");
  61   Real half_space = 0.5;
  62
  63   Item * bound = dynamic_cast<Spanner*> (me)->get_bound (LEFT);
  64
  65   /*
  66     not a start, but really broken in two
  67    */
  68   Real left =0.;
  69   if (bound->break_status_dir () == RIGHT)
  70   {
  71     Paper_column *pc = bound->column_l ();
  72     left = pc->extent (pc, X_AXIS)[RIGHT]   - bound->relative_coordinate (pc, X_AXIS);
  73   }
  74   else
  75   {
  76     /*
  77       the volta spanner is attached to the bar-line, which is moved
  78       to the right. We don't need to compensate for the left edge.
  79     */
  80   }
  81
  82   Real w = dynamic_cast<Spanner*> (me)->spanner_length () - left - half_space;
  83   Real h =  gh_scm2double (me->get_grob_property ("height"));
  84   Real t =  staff_thick * gh_scm2double (me->get_grob_property ("thickness"));
  85
  86   /*
  87     ugh: should build from line segments.
  88    */
  89   SCM at = (gh_list (ly_symbol2scm ("volta"),
  90                      gh_double2scm (h),
  91                      gh_double2scm (w),
  92                      gh_double2scm (t),
  93                      gh_int2scm (no_vertical_start),
  94                      gh_int2scm (no_vertical_end),
  95                      SCM_UNDEFINED));
  96
  97   Box b (Interval (0, w), Interval (0, h));
  98   Molecule mol (b, at);
  99   SCM text = me->get_grob_property ("text");
 100   SCM properties = gh_list (me->mutable_property_alist_, me->immutable_property_alist_,SCM_UNDEFINED);
 101   Molecule num = Text_item::text2molecule (me, text, properties);
 102
 103   mol.add_at_edge (X_AXIS, LEFT, num, - num.extent (X_AXIS).length ()
 104                    - 1.0);
 105   mol.translate_axis (left, X_AXIS);
 106   return mol.smobbed_copy ();
 107 }
 108
 109
 110 void
 111 Volta_spanner::add_bar (Grob *me, Item* b)
 112 {
 113   Pointer_group_interface::add_element (me, "bars",b);
 114   Side_position_interface::add_support (me,b);
 115   add_bound_item (dynamic_cast<Spanner*> (me), b);
 116 }
 117
 118 void
 119 Volta_spanner::add_column (Grob*me, Grob* c)
 120 {
 121   Side_position_interface::add_support (me,c);
 122 }