lily/measure-grouping-spanner.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "measure-grouping-spanner.hh"
  21
  22 #include "output-def.hh"
  23 #include "spanner.hh"
  24 #include "lookup.hh"
  25 #include "item.hh"
  26 #include "staff-symbol-referencer.hh"
  27
  28 MAKE_SCHEME_CALLBACK (Measure_grouping, print, 1);
  29 SCM
  30 Measure_grouping::print (SCM grob)
  31 {
  32   Spanner *me = dynamic_cast<Spanner *> (unsmob_grob (grob));
  33
  34   SCM which = me->get_property ("style");
  35   Real height = robust_scm2double (me->get_property ("height"), 1);
  36
  37   Real t = Staff_symbol_referencer::line_thickness (me) * robust_scm2double (me->get_property ("thickness"), 1);
  38   Grob *common = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT),
  39                                                         X_AXIS);
  40
  41   Real right_point = robust_relative_extent (me->get_bound (RIGHT),
  42                                              common, X_AXIS).linear_combination (CENTER);
  43   Real left_point = me->get_bound (LEFT)->relative_coordinate (common, X_AXIS);
  44
  45   Interval iv (left_point, right_point);
  46   Stencil m;
  47
  48   /*
  49     TODO: use line interface
  50   */
  51   if (which == ly_symbol2scm ("bracket"))
  52     m = Lookup::bracket (X_AXIS, iv, t, -height, t);
  53   else if (which == ly_symbol2scm ("triangle"))
  54     m = Lookup::triangle (iv, t, height);
  55
  56   m.align_to (Y_AXIS, DOWN);
  57   m.translate_axis (- me->relative_coordinate (common, X_AXIS), X_AXIS);
  58   return m.smobbed_copy ();
  59 }
  60
  61 ADD_INTERFACE (Measure_grouping,
  62                "This object indicates groups of beats.  Valid choices for"
  63                " @code{style} are @code{bracket} and @code{triangle}.",
  64
  65                /* properties */
  66                "thickness "
  67                "style "
  68                "height "
  69                );
  70