lily/staff-symbol-referencer-scheme.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1999--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 "grob.hh"
  21 #include "libc-extension.hh"
  22 #include "staff-symbol.hh"
  23 #include "staff-symbol-referencer.hh"
  24
  25 LY_DEFINE (ly_grob_staff_position, "ly:grob-staff-position",
  26            1, 0, 0, (SCM sg),
  27            "Return the Y-position of @var{sg} relative to the staff.")
  28 {
  29   LY_ASSERT_SMOB (Grob, sg, 1);
  30   Grob *g = unsmob_grob (sg);
  31   Real pos = Staff_symbol_referencer::get_position (g);
  32
  33   if (fabs (rint (pos) -pos) < 1e-6) // ugh.
  34     return scm_from_int ((int) my_round (pos));
  35   else
  36     return scm_from_double (pos);
  37 }
  38
  39 LY_DEFINE (ly_position_on_line_p, "ly:position-on-line?",
  40            2, 0, 0, (SCM sg, SCM spos),
  41            "Return whether @var{spos} is on a line of the staff associated"
  42            " with the grob @var{sg} (even on an extender line).")
  43 {
  44   LY_ASSERT_SMOB (Grob, sg, 1);
  45   LY_ASSERT_TYPE (scm_is_number, spos, 2);
  46   Grob *g = unsmob_grob (sg);
  47   Grob *st = Staff_symbol_referencer::get_staff_symbol (g);
  48   int pos = scm_to_int (spos);
  49   bool on_line = st ? Staff_symbol::on_line (g, pos) : false;
  50   return scm_from_bool (on_line);
  51 }
  52
  53 LY_DEFINE (ly_staff_symbol_line_thickness, "ly:staff-symbol-line-thickness",
  54            1, 0, 0, (SCM grob),
  55            "Returns the @code{line-thickness} of the staff associated"
  56            " with @var{grob}.")
  57 {
  58   LY_ASSERT_SMOB (Grob, grob, 1);
  59   Grob *g = unsmob_grob (grob);
  60   Real thickness = Staff_symbol_referencer::line_thickness (g);
  61   return scm_from_double (thickness);
  62 }
  63
  64 LY_DEFINE (ly_staff_symbol_staff_space, "ly:staff-symbol-staff-space",
  65            1, 0, 0, (SCM grob),
  66            "Returns the @code{staff-space} of the staff associated"
  67            " with @var{grob}.")
  68 {
  69   LY_ASSERT_SMOB (Grob, grob, 1);
  70   Grob *g = unsmob_grob (grob);
  71   Real staff_space = Staff_symbol_referencer::staff_space (g);
  72   return scm_from_double (staff_space);
  73 }