lily/cue-clef-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5                            Mats Bengtsson <matsb@s3.kth.se>
   6   Copyright (C) 2010--2011 Reinhold Kainhofer <reinhold@kainhofer.com>
   7
   8   LilyPond is free software: you can redistribute it and/or modify
   9   it under the terms of the GNU General Public License as published by
  10   the Free Software Foundation, either version 3 of the License, or
  11   (at your option) any later version.
  12
  13   LilyPond is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include <cctype>
  23 using namespace std;
  24
  25 #include "item.hh"
  26 #include "context.hh"
  27 #include "bar-line.hh"
  28 #include "staff-symbol-referencer.hh"
  29 #include "engraver.hh"
  30 #include "direction.hh"
  31 #include "side-position-interface.hh"
  32 #include "warn.hh"
  33 #include "international.hh"
  34
  35 #include "translator.icc"
  36
  37 class Cue_clef_engraver : public Engraver
  38 {
  39 public:
  40   TRANSLATOR_DECLARATIONS (Cue_clef_engraver);
  41
  42 protected:
  43   void stop_translation_timestep ();
  44   void process_music ();
  45   DECLARE_ACKNOWLEDGER (bar_line);
  46
  47   virtual void derived_mark () const;
  48 private:
  49   Item *clef_;
  50   Item *octavate_;
  51
  52   SCM prev_glyph_;
  53   SCM prev_cpos_;
  54   SCM prev_octavation_;
  55   void create_clef ();
  56   void create_end_clef ();
  57   void set_glyph ();
  58   void inspect_clef_properties ();
  59   void create_octavate_eight (SCM oct);
  60 };
  61
  62 void
  63 Cue_clef_engraver::derived_mark () const
  64 {
  65   scm_gc_mark (prev_octavation_);
  66   scm_gc_mark (prev_cpos_);
  67   scm_gc_mark (prev_glyph_);
  68 }
  69
  70 Cue_clef_engraver::Cue_clef_engraver ()
  71 {
  72   clef_ = 0;
  73   octavate_ = 0;
  74
  75   prev_octavation_ = prev_cpos_ = prev_glyph_ = SCM_EOL;
  76 }
  77
  78 void
  79 Cue_clef_engraver::set_glyph ()
  80 {
  81   SCM glyph_sym = ly_symbol2scm ("glyph");
  82   SCM basic = ly_symbol2scm ("CueClef");
  83   execute_pushpop_property (context (), basic, glyph_sym, SCM_UNDEFINED);
  84   execute_pushpop_property (context (), basic, glyph_sym, get_property ("cueClefGlyph"));
  85
  86   basic = ly_symbol2scm ("CueEndClef");
  87   execute_pushpop_property (context (), basic, glyph_sym, SCM_UNDEFINED);
  88   execute_pushpop_property (context (), basic, glyph_sym, get_property ("clefGlyph"));
  89 }
  90
  91 /**
  92    Generate a clef at the start of a measure. (when you see a Bar,
  93    ie. a breakpoint)
  94 */
  95 void
  96 Cue_clef_engraver::acknowledge_bar_line (Grob_info info)
  97 {
  98   Item *item = info.item ();
  99   if (item && scm_is_string (get_property ("cueClefGlyph")))
 100     create_clef ();
 101 }
 102
 103 void
 104 Cue_clef_engraver::create_octavate_eight (SCM oct)
 105 {
 106   if (scm_is_number (oct) && scm_to_int (oct))
 107     {
 108       Item *g = make_item ("OctavateEight", SCM_EOL);
 109
 110       int abs_oct = scm_to_int (oct);
 111       int dir = sign (abs_oct);
 112       abs_oct = abs (abs_oct) + 1;
 113
 114       SCM txt = scm_number_to_string (scm_from_int (abs_oct),
 115                                       scm_from_int (10));
 116
 117       g->set_property ("text",
 118                        scm_list_n (ly_lily_module_constant ("vcenter-markup"),
 119                                    txt, SCM_UNDEFINED));
 120       Side_position_interface::add_support (g, clef_);
 121
 122       g->set_parent (clef_, Y_AXIS);
 123       g->set_parent (clef_, X_AXIS);
 124       g->set_property ("direction", scm_from_int (dir));
 125       octavate_ = g;
 126     }
 127 }
 128
 129 void
 130 Cue_clef_engraver::create_clef ()
 131 {
 132   if (!clef_)
 133     {
 134       Item *c = make_item ("CueClef", SCM_EOL);
 135
 136       clef_ = c;
 137       SCM cpos = get_property ("cueClefPosition");
 138       if (scm_is_number (cpos))
 139         clef_->set_property ("staff-position", cpos);
 140
 141       create_octavate_eight (get_property ("cueClefOctavation"));
 142     }
 143 }
 144
 145 void
 146 Cue_clef_engraver::create_end_clef ()
 147 {
 148   if (!clef_)
 149     {
 150       clef_ = make_item ("CueEndClef", SCM_EOL);
 151       SCM cpos = get_property ("clefPosition");
 152       if (scm_is_number (cpos))
 153         clef_->set_property ("staff-position", cpos);
 154
 155       create_octavate_eight (get_property ("clefOctavation"));
 156     }
 157 }
 158
 159 void
 160 Cue_clef_engraver::process_music ()
 161 {
 162   inspect_clef_properties ();
 163 }
 164
 165 void
 166 Cue_clef_engraver::inspect_clef_properties ()
 167 {
 168   SCM glyph = get_property ("cueClefGlyph");
 169   SCM clefpos = get_property ("cueClefPosition");
 170   SCM octavation = get_property ("cueClefOctavation");
 171
 172   if (scm_equal_p (glyph, prev_glyph_) == SCM_BOOL_F
 173       || scm_equal_p (clefpos, prev_cpos_) == SCM_BOOL_F
 174       || scm_equal_p (octavation, prev_octavation_) == SCM_BOOL_F)
 175     {
 176       set_glyph ();
 177       if (scm_is_string (glyph))
 178         {
 179           create_clef ();
 180           if (clef_)
 181             clef_->set_property ("non-default", SCM_BOOL_T);
 182         }
 183       else
 184         create_end_clef ();
 185
 186       prev_cpos_ = clefpos;
 187       prev_glyph_ = glyph;
 188       prev_octavation_ = octavation;
 189     }
 190
 191 }
 192
 193 void
 194 Cue_clef_engraver::stop_translation_timestep ()
 195 {
 196   if (clef_)
 197     {
 198       SCM vis = 0;
 199       if (to_boolean (clef_->get_property ("non-default")))
 200         vis = get_property ("explicitCueClefVisibility");
 201
 202       if (vis)
 203         clef_->set_property ("break-visibility", vis);
 204
 205       clef_ = 0;
 206       octavate_ = 0;
 207     }
 208 }
 209
 210 ADD_ACKNOWLEDGER (Cue_clef_engraver, bar_line);
 211 ADD_TRANSLATOR (Cue_clef_engraver,
 212                 /* doc */
 213                 "Determine and set reference point for pitches in cued voices.",
 214
 215                 /* create */
 216                 "CueClef "
 217                 "CueEndClef "
 218                 "OctavateEight ",
 219
 220                 /* read */
 221                 "cueClefGlyph "
 222                 "cueClefOctavation "
 223                 "cueClefPosition "
 224                 "explicitCueClefVisibility "
 225                 "middleCCuePosition "
 226                 "clefOctavation ",
 227
 228                 /* write */
 229                 ""
 230                 );