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--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "stencil.hh"
  10 #include "spanner.hh"
  11 #include "item.hh"
  12 #include "tuplet-bracket.hh"
  13
  14 struct Piano_pedal_bracket
  15 {
  16   DECLARE_SCHEME_CALLBACK (print, (SCM));
  17   DECLARE_GROB_INTERFACE ();
  18 };
  19
  20 MAKE_SCHEME_CALLBACK (Piano_pedal_bracket, print, 1);
  21 SCM
  22 Piano_pedal_bracket::print (SCM smob)
  23 {
  24   Spanner *me = dynamic_cast<Spanner *> (unsmob_grob (smob));
  25   Spanner *orig = dynamic_cast<Spanner *> (me->original ());
  26
  27   Drul_array<bool> broken (false, false);
  28   Drul_array<Real> height = robust_scm2drul
  29     (me->get_property ("edge-height"), Interval (0, 0));
  30   Drul_array<Real> shorten = robust_scm2drul
  31     (me->get_property ("shorten-pair"), Interval (0, 0));
  32   Drul_array<Real> flare = robust_scm2drul
  33     (me->get_property ("bracket-flare"), Interval (0, 0));
  34
  35   Grob *common = me->get_bound (LEFT)
  36     ->common_refpoint (me->get_bound (RIGHT), X_AXIS);
  37   Grob *textbit = unsmob_grob (me->get_object ("pedal-text"));
  38
  39   if (textbit)
  40     common = common->common_refpoint (textbit, X_AXIS);
  41
  42   Interval span_points (0, 0);
  43   Direction d = LEFT;
  44   do
  45     {
  46       Item *b = me->get_bound (d);
  47       broken[d] = b->break_status_dir () != CENTER;
  48       if (broken[d])
  49         {
  50           if (orig
  51               && ((d == RIGHT
  52                    && me->get_break_index () != orig->broken_intos_.size () - 1)
  53                   || (d == LEFT && me->get_break_index ())))
  54             height[d] = 0.0;
  55           else
  56             flare[d] = 0.0;
  57         }
  58
  59       Interval ext = robust_relative_extent (b, common, X_AXIS);
  60       span_points[d] = ext [broken[d] ? RIGHT : LEFT];
  61     }
  62   while (flip (&d) != LEFT);
  63
  64   /* For 'Mixed' style pedals, i.e.  a bracket preceded by text:  Ped._____|
  65      need to shorten by the extent of the text grob
  66   */
  67   if (textbit)
  68     {
  69       height[LEFT] = 0;
  70
  71       Real padding = robust_scm2double (me->get_property ("bound-padding"), 0);
  72
  73       span_points[LEFT] = padding
  74         + robust_relative_extent (textbit, common, X_AXIS)[RIGHT];
  75     }
  76
  77   Stencil m;
  78   if (!span_points.is_empty ()
  79       && span_points.length () > 0.001)
  80     {
  81       m = Tuplet_bracket::make_bracket (me, Y_AXIS,
  82                                         Offset (span_points.length (), 0),
  83                                         height,
  84                                         Interval (),
  85                                         flare, shorten);
  86     }
  87   m.translate_axis (span_points[LEFT]
  88                     - me->relative_coordinate (common, X_AXIS), X_AXIS);
  89   return m.smobbed_copy ();
  90 }
  91
  92 ADD_INTERFACE (Piano_pedal_bracket,
  93                "The bracket of the piano pedal.  It can be tuned through"
  94                " the regular bracket properties.",
  95
  96                /* properties */
  97                "bound-padding "
  98                "edge-height "
  99                "shorten-pair "
 100                "bracket-flare "
 101                "pedal-text "
 102                );