lily/piano-pedal-bracket.cc

   1 /*
   2   piano-pedal-bracket.cc --  implement  Piano_pedal_bracket
   3
   4 source file of the GNU LilyPond music typesetter
   5
   6 (c) 2003--2004 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8 */
   9
  10 #include "stencil.hh"
  11 #include "spanner.hh"
  12 #include "item.hh"
  13 #include "tuplet-bracket.hh"
  14
  15 struct Piano_pedal_bracket
  16 {
  17   DECLARE_SCHEME_CALLBACK (print,(SCM));
  18   static bool has_interface (Grob*);
  19 };
  20
  21
  22 MAKE_SCHEME_CALLBACK (Piano_pedal_bracket,print,1);
  23 SCM
  24 Piano_pedal_bracket::print (SCM smob)
  25 {
  26   Spanner *me = dynamic_cast<Spanner*> (unsmob_grob (smob));
  27   Spanner *orig = dynamic_cast<Spanner*> (me->original_);
  28
  29   Drul_array<bool> broken (false,false);
  30   Drul_array<Real> height = robust_scm2drul
  31     (me->get_property ("edge-height"), Interval (0,0));
  32   Drul_array<Real> shorten = robust_scm2drul
  33     (me->get_property ("shorten-pair"), Interval (0,0));
  34   Drul_array<Real> flare = robust_scm2drul
  35     (me->get_property ("bracket-flare"), Interval (0,0));
  36
  37   Grob *common = me->get_bound (LEFT)
  38     ->common_refpoint (me->get_bound (RIGHT), X_AXIS);
  39   Grob *textbit = unsmob_grob (me->get_property ("pedal-text"));
  40
  41   if (textbit)
  42     common = common->common_refpoint (textbit, X_AXIS);
  43
  44   Interval span_points (0,0);
  45   Direction d = LEFT;
  46   do
  47     {
  48       Item *b = me->get_bound (d);
  49       broken[d] = b->break_status_dir () != CENTER;
  50       if (broken[d])
  51         {
  52           if (orig
  53               && ((d == RIGHT && me->get_break_index () != orig->broken_intos_.size()-1)
  54                   || (d == LEFT && me->get_break_index ())))
  55             height[d] = 0.0;
  56           else
  57             flare[d] = 0.0;
  58         }
  59
  60       Interval ext   = b->extent (common,  X_AXIS);
  61       span_points[d] = ext [broken[d] ?  RIGHT : LEFT];
  62     }
  63   while (flip (&d) != LEFT);
  64
  65
  66   /* For 'Mixed' style pedals, i.e.  a bracket preceded by text:  Ped._____|
  67    need to shorten by the extent of the text grob
  68   */
  69   if (textbit)
  70     {
  71       height[LEFT] = 0;
  72
  73       Real padding = robust_scm2double (me->get_property ("if-text-padding"), 0);
  74
  75       span_points[LEFT] = padding
  76         + textbit->extent (common, X_AXIS)[RIGHT];
  77     }
  78
  79
  80   Stencil m ;
  81   if (!span_points.is_empty () &&
  82       span_points.length () > 0.001)
  83     {
  84       m = Tuplet_bracket::make_bracket (me, Y_AXIS,
  85                                         Offset (span_points.length (), 0),
  86                                         height,
  87                                         Interval (),
  88                                         flare, shorten);
  89     }
  90   m.translate_axis (span_points[LEFT]
  91                     - me->relative_coordinate (common, X_AXIS), X_AXIS);
  92   return m.smobbed_copy ();
  93 }
  94
  95
  96
  97 ADD_INTERFACE (Piano_pedal_bracket,"piano-pedal-bracket-interface",
  98                "The bracket of the piano pedal.  It can be tuned through the regular "
  99                "bracket properties.",
 100                "edge-height shorten-pair bracket-flare pedal-text");