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 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8 */
   9
  10 #include "line-interface.hh"
  11 #include "lily-guile.hh"
  12 #include "spanner.hh"
  13 #include "output-def.hh"
  14 #include "item.hh"
  15 #include "stencil.hh"
  16 #include "pointer-group-interface.hh"
  17 #include "axis-group-interface.hh"
  18
  19
  20 #include "horizontal-bracket.hh"
  21
  22 struct Figured_bass_continuation
  23 {
  24   static bool has_interface (Grob*);
  25
  26 public:
  27   DECLARE_SCHEME_CALLBACK(print, (SCM));
  28   DECLARE_SCHEME_CALLBACK(center_on_figures, (SCM, SCM));
  29 };
  30
  31 MAKE_SCHEME_CALLBACK (Figured_bass_continuation, center_on_figures, 2);
  32 SCM
  33 Figured_bass_continuation::center_on_figures (SCM grob, SCM axis)
  34 {
  35   Spanner *me = dynamic_cast<Spanner*> (unsmob_grob (grob));
  36   (void) axis;
  37
  38   extract_grob_set (me, "figures", figures);
  39   Grob *common = common_refpoint_of_array (figures, me, Y_AXIS);
  40
  41   Interval ext = Axis_group_interface::relative_group_extent (figures, common, Y_AXIS);
  42
  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->get_layout ()->get_dimension (ly_symbol2scm ("linethickness"))
  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       spanned[d]
  63         = robust_relative_extent (me->get_bound (d), common, X_AXIS)[RIGHT]
  64         - me->relative_coordinate (common, X_AXIS);
  65     }
  66   while (flip (&d) !=  LEFT);
  67   spanned.widen (- robust_scm2double (me->get_property ("padding"), 0.2));
  68
  69   Stencil extender;
  70   if (!spanned.is_empty ())
  71     extender = Line_interface::make_line (thick,
  72                                           Offset (spanned[LEFT], 0),
  73                                           Offset (spanned[RIGHT], 0));
  74
  75   return extender.smobbed_copy ();
  76 }
  77
  78 ADD_INTERFACE(Figured_bass_continuation,
  79               "figured-bass-continuation-interface",
  80               "Simple extender line between bounds.",
  81
  82               /* props */
  83               "thickness "
  84               "padding "
  85               "figures "
  86               );
  87