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--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "paper-def.hh"
  11 #include "spanner.hh"
  12 #include "measure-grouping-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   /*
  24     TODO: robustify.
  25    */
  26   SCM which = me->get_property ("style");
  27   Real height = robust_scm2double (me->get_property ("height"), 1);
  28
  29   Real t = Staff_symbol_referencer::line_thickness (me) * robust_scm2double (me->get_property ("thickness"), 1);
  30   Grob *common = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT),
  31                                                        X_AXIS);
  32
  33   Interval rext = me->get_bound (RIGHT)->extent (common, X_AXIS);
  34
  35
  36   Real w =(rext.is_empty ()
  37            ? me->get_bound (RIGHT)->relative_coordinate (common, X_AXIS)
  38            : rext[RIGHT])
  39     - me->get_bound (LEFT)->relative_coordinate (common, X_AXIS);
  40
  41   Interval iv (0,w);
  42
  43   Stencil m;
  44
  45   /*
  46     TODO: use line interface
  47    */
  48   if (which == ly_symbol2scm ("bracket"))
  49     {
  50       m = Lookup::bracket (X_AXIS, iv, t, -height, t);
  51     }
  52   else if (which == ly_symbol2scm ("triangle"))
  53     {
  54       m = Lookup::triangle (iv, t, height);
  55     }
  56
  57   m.align_to (Y_AXIS, DOWN);
  58   return m.smobbed_copy ();
  59 }
  60
  61 ADD_INTERFACE (Measure_grouping,"measure-grouping-interface",
  62                "This objectt indicates groups of beats. "
  63                "Valid choices for @code{style} are @code{bracket} and @code{triangle}.",
  64                "thickness style height");
  65
  66