lily/figured-bass-continuation.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2005--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "line-interface.hh"
  22 #include "spanner.hh"
  23 #include "output-def.hh"
  24 #include "item.hh"
  25 #include "stencil.hh"
  26 #include "pointer-group-interface.hh"
  27 #include "axis-group-interface.hh"
  28
  29
  30 #include "horizontal-bracket.hh"
  31
  32 struct Figured_bass_continuation
  33 {
  34   DECLARE_GROB_INTERFACE ();
  35
  36 public:
  37   DECLARE_SCHEME_CALLBACK (print, (SCM));
  38   DECLARE_SCHEME_CALLBACK (center_on_figures, (SCM));
  39 };
  40
  41 MAKE_SCHEME_CALLBACK (Figured_bass_continuation, center_on_figures, 1);
  42 SCM
  43 Figured_bass_continuation::center_on_figures (SCM grob)
  44 {
  45   Spanner *me = dynamic_cast<Spanner*> (unsmob_grob (grob));
  46   extract_grob_set (me, "figures", figures);
  47   if (figures.empty ())
  48     return scm_from_double (0.0);
  49   Grob *common = common_refpoint_of_array (figures, me, Y_AXIS);
  50
  51   Interval ext = Axis_group_interface::relative_group_extent (figures, common, Y_AXIS);
  52   if (ext.is_empty ())
  53     return scm_from_double (0.0);
  54   return scm_from_double (ext.center () - me->relative_coordinate (common, Y_AXIS));
  55 }
  56
  57 MAKE_SCHEME_CALLBACK (Figured_bass_continuation, print, 1);
  58 SCM
  59 Figured_bass_continuation::print (SCM grob)
  60 {
  61   Spanner *me = dynamic_cast<Spanner*> (unsmob_grob (grob));
  62
  63   Real thick =
  64     me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"))
  65     * robust_scm2double (me->get_property ("thickness"), 1);
  66
  67   Interval spanned;
  68   Direction d = LEFT;
  69   Grob *common = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT),
  70                                                         X_AXIS);
  71   do
  72     {
  73       Item *bound = me->get_bound (d);
  74       Direction extdir =
  75         (d == LEFT && to_boolean (bound->get_property ("implicit")))
  76         ? LEFT : RIGHT;
  77
  78       spanned[d]
  79         = robust_relative_extent (bound, common, X_AXIS)[extdir]
  80         - me->relative_coordinate (common, X_AXIS);
  81     }
  82   while (flip (&d) !=  LEFT);
  83   spanned.widen (- robust_scm2double (me->get_property ("padding"), 0.2));
  84
  85   Stencil extender;
  86   if (!spanned.is_empty ())
  87     extender = Line_interface::make_line (thick,
  88                                           Offset (spanned[LEFT], 0),
  89                                           Offset (spanned[RIGHT], 0));
  90
  91   return extender.smobbed_copy ();
  92 }
  93
  94 ADD_INTERFACE (Figured_bass_continuation,
  95               "Simple extender line between bounds.",
  96
  97               /* properties */
  98               "thickness "
  99               "padding "
 100               "figures "
 101               );
 102