lily/measure-grouping-spanner.cc

   1 /*
   2   measure-grouping-spanner.cc -- implement Measure_grouping
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2002--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "measure-grouping-spanner.hh"
  10
  11 #include "output-def.hh"
  12 #include "spanner.hh"
  13 #include "lookup.hh"
  14 #include "item.hh"
  15 #include "staff-symbol-referencer.hh"
  16
  17 MAKE_SCHEME_CALLBACK (Measure_grouping, print, 1);
  18 SCM
  19 Measure_grouping::print (SCM grob)
  20 {
  21   Spanner *me = dynamic_cast<Spanner *> (unsmob_grob (grob));
  22
  23   SCM which = me->get_property ("style");
  24   Real height = robust_scm2double (me->get_property ("height"), 1);
  25
  26   Real t = Staff_symbol_referencer::line_thickness (me) * robust_scm2double (me->get_property ("thickness"), 1);
  27   Grob *common = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT),
  28                                                         X_AXIS);
  29
  30   Real right_point = robust_relative_extent (me->get_bound (RIGHT),
  31                                              common, X_AXIS).linear_combination (CENTER);
  32   Real left_point = me->get_bound (LEFT)->relative_coordinate (common, X_AXIS);
  33
  34   Interval iv (left_point, right_point);
  35   Stencil m;
  36
  37   /*
  38     TODO: use line interface
  39   */
  40   if (which == ly_symbol2scm ("bracket"))
  41     m = Lookup::bracket (X_AXIS, iv, t, -height, t);
  42   else if (which == ly_symbol2scm ("triangle"))
  43     m = Lookup::triangle (iv, t, height);
  44
  45   m.align_to (Y_AXIS, DOWN);
  46   m.translate_axis (- me->relative_coordinate (common, X_AXIS), X_AXIS);
  47   return m.smobbed_copy ();
  48 }
  49
  50 ADD_INTERFACE (Measure_grouping,
  51                "This object indicates groups of beats.  Valid choices for"
  52                " @code{style} are @code{bracket} and @code{triangle}.",
  53
  54                /* properties */
  55                "thickness "
  56                "style "
  57                "height "
  58                );
  59