lily/custos.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2010 Juergen Reuter <reuter@ipd.uka.de>
   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 /* TODO:
  21
  22 - do not show if a clef change immediately follows in the next line
  23
  24 - decide: do or do not print custos if the next line starts with a rest
  25 */
  26
  27 #include <cstdio>
  28 #include <cmath> // rint
  29 using namespace std;
  30
  31 #include "custos.hh"
  32 #include "direction.hh"
  33 #include "font-interface.hh"
  34 #include "international.hh"
  35 #include "item.hh"
  36 #include "note-head.hh"
  37 #include "staff-symbol-referencer.hh"
  38 #include "warn.hh"
  39
  40 MAKE_SCHEME_CALLBACK (Custos, print, 1);
  41 SCM
  42 Custos::print (SCM smob)
  43 {
  44   Item *me = (Item *)unsmob_grob (smob);
  45
  46   SCM scm_style = me->get_property ("style");
  47   string style;
  48   if (scm_is_symbol (scm_style))
  49     style = ly_symbol2string (scm_style);
  50   else
  51     style = "mensural";
  52
  53   /*
  54    * Shall we use a common custos font character regardless if on
  55    * staffline or not, or shall we use individual font characters
  56    * for both cases?
  57    */
  58   bool adjust = true;
  59
  60   int neutral_pos = robust_scm2int (me->get_property ("neutral-position"), 0);
  61   Direction neutral_direction
  62     = to_dir (me->get_property ("neutral-direction"));
  63
  64   int pos = Staff_symbol_referencer::get_rounded_position (me);
  65   int sz = Staff_symbol_referencer::line_count (me) - 1;
  66
  67   string font_char = "custodes." + style + ".";
  68   if (pos < neutral_pos)
  69     font_char += "u";
  70   else if (pos > neutral_pos)
  71     font_char += "d";
  72   else if (neutral_direction == UP)
  73     font_char += "u";
  74   else if (neutral_direction == DOWN)
  75     font_char += "d";
  76   else // auto direction; not yet supported -> use "d"
  77     font_char += "d";
  78
  79   if (adjust)
  80     font_char += (((pos ^ sz) & 0x1) == 0) ? "1" : "0";
  81   else
  82     font_char += "2";
  83
  84   Stencil stencil
  85     = Font_interface::get_default_font (me)->find_by_name (font_char);
  86   if (stencil.is_empty ())
  87     {
  88       me->warning (_f ("custos `%s' not found", font_char));
  89       return SCM_EOL;
  90     }
  91
  92   return stencil.smobbed_copy ();
  93 }
  94
  95 ADD_INTERFACE (Custos,
  96                "A custos object.  @code{style} can have four valid values:"
  97                " @code{mensural}, @code{vaticana}, @code{medicaea}, and"
  98                " @code{hufnagel}.  @code{mensural} is the default style.",
  99
 100                /* properties */
 101                "style "
 102                "neutral-position "
 103                "neutral-direction "
 104                );