lily/note-head.cc

   1 /*
   2   notehead.cc -- implement Note_head
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9 #include "note-head.hh"
  10
  11 #include <math.h>
  12 #include <cctype>
  13 #include <algorithm>            //  min, max
  14
  15 using namespace std;
  16
  17 #include "directional-element-interface.hh"
  18 #include "staff-symbol.hh"
  19 #include "misc.hh"
  20 #include "dots.hh"
  21 #include "warn.hh"
  22 #include "font-interface.hh"
  23 #include "event.hh"
  24 #include "rhythmic-head.hh"
  25 #include "staff-symbol-referencer.hh"
  26 #include "lookup.hh"
  27 #include "output-def.hh"
  28
  29 /*
  30   clean up the mess left by ledger line handling.
  31 */
  32 static Stencil
  33 internal_print (Grob *me, String *font_char)
  34 {
  35   SCM style = me->get_property ("style");
  36   if (!scm_is_symbol (style))
  37     {
  38       return Stencil ();
  39     }
  40
  41   SCM log = scm_int2num (Note_head::get_balltype (me));
  42   SCM proc = me->get_property ("glyph-name-procedure");
  43   SCM scm_font_char = scm_call_2 (proc, log, style);
  44
  45   Font_metric *fm = Font_interface::get_default_font (me);
  46
  47   Direction stem_dir = CENTER;
  48   if (Grob *stem = unsmob_grob (me->get_property ("stem")))
  49     {
  50       stem_dir = get_grob_direction (stem);
  51       if (stem_dir == CENTER)
  52         programming_error ("must have stem dir for note head");
  53     }
  54
  55   Stencil out;
  56
  57   String prefix = "noteheads.";
  58   String idx
  59     = prefix + ((stem_dir == UP) ? "u" : "d") + ly_scm2string (scm_font_char);
  60   out = fm->find_by_name (idx);
  61   if (out.is_empty ())
  62     {
  63       idx = prefix + "s" + ly_scm2string (scm_font_char);
  64       out = fm->find_by_name (idx);
  65     }
  66
  67   if (out.is_empty ())
  68     {
  69       me->warning (_f ("note head `%s' not found", idx.to_str0 ()));
  70     }
  71   else
  72     {
  73       *font_char = idx;
  74     }
  75
  76   return out;
  77 }
  78
  79 MAKE_SCHEME_CALLBACK (Note_head, print, 1);
  80 SCM
  81 Note_head::print (SCM smob)
  82 {
  83   Grob *me = unsmob_grob (smob);
  84
  85   String idx;
  86   return internal_print (me, &idx).smobbed_copy ();
  87 }
  88
  89 Real
  90 Note_head::stem_attachment_coordinate (Grob *me, Axis a)
  91 {
  92   SCM brewer = me->get_property ("print-function");
  93   Font_metric *fm = Font_interface::get_default_font (me);
  94
  95   if (brewer == Note_head::print_proc)
  96     {
  97       String key;
  98       internal_print (me, &key);
  99
 100       int k = fm->name_to_index (key);
 101       if (k >= 0)
 102         {
 103           Box b = fm->get_indexed_char (k);
 104           Offset wxwy = fm->attachment_point (key);
 105           Interval v = b[a];
 106           if (!v.is_empty ())
 107             return 2 * (wxwy[a] - v.center ()) / v.length ();
 108         }
 109     }
 110
 111   /*
 112     Fallback
 113   */
 114   SCM v = me->get_property ("stem-attachment-function");
 115   if (!ly_c_procedure_p (v))
 116     return 0.0;
 117
 118   SCM result = scm_call_2 (v, me->self_scm (), scm_int2num (a));
 119   if (!scm_is_pair (result))
 120     return 0.0;
 121
 122   result = (a == X_AXIS) ? scm_car (result) : scm_cdr (result);
 123
 124   return robust_scm2double (result, 0);
 125 }
 126
 127 int
 128 Note_head::get_balltype (Grob *me)
 129 {
 130   SCM s = me->get_property ("duration-log");
 131   return scm_is_number (s) ? min (scm_to_int (s), 2) : 0;
 132 }
 133
 134 ADD_INTERFACE (Note_head, "note-head-interface",
 135                "Note head",
 136                "note-names glyph-name-procedure accidental-grob style stem-attachment-function");
 137