lily/clef-engraver.cc

   1 /*
   2   clef-engraver.cc -- implement Clef_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>,
   7
   8   Mats Bengtsson <matsb@s3.kth.se>
   9 */
  10
  11 #include <ctype.h>
  12
  13 #include "context.hh"
  14 #include "bar-line.hh"
  15 #include "staff-symbol-referencer.hh"
  16 #include "engraver.hh"
  17 #include "direction.hh"
  18 #include "side-position-interface.hh"
  19 #include "item.hh"
  20
  21 class Clef_engraver : public  Engraver
  22 {
  23 public:
  24   TRANSLATOR_DECLARATIONS (Clef_engraver);
  25
  26   Direction octave_dir_;
  27
  28 protected:
  29   virtual void stop_translation_timestep ();
  30   virtual void process_music ();
  31   virtual void acknowledge_grob (Grob_info);
  32 private:
  33   Item * clef_;
  34   Item * octavate_;
  35
  36   SCM prev_glyph_;
  37   SCM prev_cpos_;
  38   SCM prev_octavation_;
  39   void create_clef ();
  40   void set_glyph ();
  41   void inspect_clef_properties ();
  42 };
  43
  44 Clef_engraver::Clef_engraver ()
  45 {
  46   clef_ = 0;
  47   octave_dir_ = CENTER;
  48   octavate_ = 0;
  49
  50   /*
  51     will trigger a clef at the start since #f != ' ()
  52    */
  53   prev_cpos_ = prev_glyph_ = SCM_BOOL_F;
  54 }
  55
  56 void
  57 Clef_engraver::set_glyph ()
  58 {
  59   SCM glyph_sym = ly_symbol2scm ("glyph-name");
  60   SCM glyph = get_property ("clefGlyph");
  61
  62   SCM basic = ly_symbol2scm ("Clef");
  63
  64   execute_pushpop_property (daddy_context_, basic, glyph_sym, SCM_UNDEFINED);
  65   execute_pushpop_property (daddy_context_, basic, glyph_sym, glyph);
  66 }
  67
  68 /**
  69   Generate a clef at the start of a measure. (when you see a Bar,
  70   ie. a breakpoint)
  71   */
  72 void
  73 Clef_engraver::acknowledge_grob (Grob_info info)
  74 {
  75   Item * item =dynamic_cast <Item *> (info.grob_);
  76   if (item)
  77     {
  78       if (Bar_line::has_interface (info.grob_)
  79           && gh_string_p (get_property ("clefGlyph")))
  80         create_clef ();
  81     }
  82 }
  83
  84 void
  85 Clef_engraver::create_clef ()
  86 {
  87   if (!clef_)
  88     {
  89       Item *c= make_item ("Clef");
  90       announce_grob (c, SCM_EOL);
  91
  92       clef_ = c;
  93       SCM cpos = get_property ("clefPosition");
  94
  95       if (gh_number_p (cpos))
  96         Staff_symbol_referencer::set_position (clef_, gh_scm2int (cpos));
  97
  98       SCM oct =  get_property ("clefOctavation");
  99       if (gh_number_p (oct) && gh_scm2int (oct))
 100         {
 101           Item * g = make_item ("OctavateEight");
 102
 103           int abs_oct = gh_scm2int (oct) ;
 104           int dir = sign (abs_oct);
 105           abs_oct = abs (abs_oct)  + 1;
 106
 107           SCM txt = scm_number_to_string (gh_int2scm (abs_oct),
 108                                           SCM_MAKINUM (10));
 109
 110           g->set_property ("text",
 111                            scm_list_n (ly_scheme_function ("vcenter-markup"),
 112                                        txt,  SCM_UNDEFINED));
 113           Side_position_interface::add_support (g,clef_);
 114
 115           g->set_parent (clef_, Y_AXIS);
 116           g->set_parent (clef_, X_AXIS);
 117           g->set_property ("direction", scm_int2num (dir));
 118           octavate_ = g;
 119           announce_grob (octavate_, SCM_EOL);
 120         }
 121     }
 122 }
 123 void
 124 Clef_engraver::process_music ()
 125 {
 126   inspect_clef_properties ();
 127 }
 128
 129 void
 130 Clef_engraver::inspect_clef_properties ()
 131 {
 132   SCM glyph = get_property ("clefGlyph");
 133   SCM clefpos = get_property ("clefPosition");
 134   SCM octavation = get_property ("clefOctavation");
 135   SCM force_clef = get_property ("forceClef");
 136
 137   if (clefpos == SCM_EOL
 138       || scm_equal_p (glyph, prev_glyph_) == SCM_BOOL_F
 139       || scm_equal_p (clefpos, prev_cpos_) == SCM_BOOL_F
 140       || scm_equal_p (octavation, prev_octavation_) == SCM_BOOL_F
 141       || to_boolean (force_clef))
 142     {
 143       set_glyph ();
 144       create_clef ();
 145
 146       clef_->set_property ("non-default", SCM_BOOL_T);
 147
 148       prev_cpos_ = clefpos;
 149       prev_glyph_ = glyph;
 150       prev_octavation_ = octavation;
 151     }
 152
 153   if (to_boolean (force_clef))
 154     {
 155       Context * w = daddy_context_->where_defined (ly_symbol2scm ("forceClef"));
 156       w->set_property ("forceClef", SCM_EOL);
 157     }
 158 }
 159
 160
 161 void
 162 Clef_engraver::stop_translation_timestep ()
 163 {
 164   if (clef_)
 165     {
 166       SCM vis = 0;
 167       if (to_boolean (clef_->get_property ("non-default")))
 168         {
 169           vis = get_property ("explicitClefVisibility");
 170         }
 171
 172       if (vis)
 173         {
 174           clef_->set_property ("break-visibility", vis);
 175           if (octavate_)
 176             {
 177               octavate_->set_property ("break-visibility", vis);
 178
 179             }
 180         }
 181
 182       typeset_grob (clef_);
 183       clef_ =0;
 184
 185       if (octavate_)
 186         {
 187           typeset_grob (octavate_);
 188         }
 189
 190       octavate_ = 0;
 191     }
 192 }
 193
 194
 195
 196 ENTER_DESCRIPTION (Clef_engraver,
 197 /* descr */       "Determine and set reference point for pitches",
 198 /* creats*/       "Clef OctavateEight",
 199 /* accepts */     "",
 200 /* acks  */      "bar-line-interface",
 201 /* reads */       "clefPosition clefGlyph middleCPosition clefOctavation explicitClefVisibility",
 202 /* write */       "");