lily/figured-bass-continuation.cc

   1 /*
   2   figured-bass-continuation.cc -- implement Figured_bass_continuation
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2005--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8 */
   9
  10 #include "line-interface.hh"
  11 #include "spanner.hh"
  12 #include "output-def.hh"
  13 #include "item.hh"
  14 #include "stencil.hh"
  15 #include "pointer-group-interface.hh"
  16 #include "axis-group-interface.hh"
  17
  18
  19 #include "horizontal-bracket.hh"
  20
  21 struct Figured_bass_continuation
  22 {
  23   DECLARE_GROB_INTERFACE ();
  24
  25 public:
  26   DECLARE_SCHEME_CALLBACK (print, (SCM));
  27   DECLARE_SCHEME_CALLBACK (center_on_figures, (SCM));
  28 };
  29
  30 MAKE_SCHEME_CALLBACK (Figured_bass_continuation, center_on_figures, 1);
  31 SCM
  32 Figured_bass_continuation::center_on_figures (SCM grob)
  33 {
  34   Spanner *me = dynamic_cast<Spanner*> (unsmob_grob (grob));
  35   extract_grob_set (me, "figures", figures);
  36   if (figures.empty ())
  37     return scm_from_double (0.0);
  38   Grob *common = common_refpoint_of_array (figures, me, Y_AXIS);
  39
  40   Interval ext = Axis_group_interface::relative_group_extent (figures, common, Y_AXIS);
  41   if (ext.is_empty ())
  42     return scm_from_double (0.0);
  43   return scm_from_double (ext.center () - me->relative_coordinate (common, Y_AXIS));
  44 }
  45
  46 MAKE_SCHEME_CALLBACK (Figured_bass_continuation, print, 1);
  47 SCM
  48 Figured_bass_continuation::print (SCM grob)
  49 {
  50   Spanner *me = dynamic_cast<Spanner*> (unsmob_grob (grob));
  51
  52   Real thick =
  53     me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"))
  54     * robust_scm2double (me->get_property ("thickness"), 1);
  55
  56   Interval spanned;
  57   Direction d = LEFT;
  58   Grob *common = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT),
  59                                                         X_AXIS);
  60   do
  61     {
  62       Item *bound = me->get_bound (d);
  63       Direction extdir =
  64         (d == LEFT && to_boolean (bound->get_property ("implicit")))
  65         ? LEFT : RIGHT;
  66
  67       spanned[d]
  68         = robust_relative_extent (bound, common, X_AXIS)[extdir]
  69         - me->relative_coordinate (common, X_AXIS);
  70     }
  71   while (flip (&d) !=  LEFT);
  72   spanned.widen (- robust_scm2double (me->get_property ("padding"), 0.2));
  73
  74   Stencil extender;
  75   if (!spanned.is_empty ())
  76     extender = Line_interface::make_line (thick,
  77                                           Offset (spanned[LEFT], 0),
  78                                           Offset (spanned[RIGHT], 0));
  79
  80   return extender.smobbed_copy ();
  81 }
  82
  83 ADD_INTERFACE (Figured_bass_continuation,
  84               "Simple extender line between bounds.",
  85
  86               /* properties */
  87               "thickness "
  88               "padding "
  89               "figures "
  90               );
  91