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--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "note-head.hh"
  10
  11 #include <cmath>
  12 #include <cctype>
  13 #include <algorithm>            //  min, max
  14
  15 using namespace std;
  16
  17 #include "directional-element-interface.hh"
  18 #include "font-interface.hh"
  19 #include "international.hh"
  20 #include "warn.hh"
  21 #include "grob.hh"
  22
  23 static Stencil
  24 internal_print (Grob *me, string *font_char)
  25 {
  26   SCM style = me->get_property ("style");
  27   if (!scm_is_symbol (style))
  28     style = ly_symbol2scm ("default");
  29
  30   string suffix = to_string (min (robust_scm2int (me->get_property ("duration-log"), 2), 2));
  31   if (style != ly_symbol2scm ("default"))
  32     {
  33       SCM gn = me->get_property ("glyph-name");
  34       if (scm_is_string (gn))
  35         suffix = ly_scm2string (gn);
  36     }
  37
  38   Font_metric *fm = Font_interface::get_default_font (me);
  39
  40   string idx_symmetric;
  41   string idx_directed;
  42   string idx_either;
  43   idx_symmetric = idx_either = "noteheads.s" + suffix;
  44   Stencil out = fm->find_by_name (idx_symmetric);
  45   if (out.is_empty ())
  46     {
  47       string prefix = "noteheads.";
  48
  49       Grob *stem = unsmob_grob (me->get_object ("stem"));
  50       Direction stem_dir = stem ? get_grob_direction (stem) : CENTER;
  51
  52       if (stem_dir == CENTER)
  53         programming_error ("must have stem dir for note head");
  54
  55       idx_directed = idx_either =
  56         prefix + ((stem_dir == UP) ? "u" : "d") + suffix;
  57       out = fm->find_by_name (idx_directed);
  58     }
  59
  60
  61   if (out.is_empty ())
  62     {
  63       me->warning (_f ("none of note heads `%s' or `%s' found",
  64                        idx_symmetric.c_str (), idx_directed.c_str ()));
  65       out = Stencil (Box (Interval (0, 0), Interval (0, 0)), SCM_EOL);
  66     }
  67   else
  68     *font_char = idx_either;
  69
  70   return out;
  71 }
  72
  73 /*
  74   TODO: make stem X-parent of notehead.
  75  */
  76 MAKE_SCHEME_CALLBACK (Note_head, stem_x_shift, 1);
  77 SCM
  78 Note_head::stem_x_shift (SCM smob)
  79 {
  80   Grob *me = unsmob_grob (smob);
  81   Grob *stem = unsmob_grob (me->get_object ("stem"));
  82   if (stem)
  83     (void) stem->get_property ("positioning-done");
  84
  85   return scm_from_int (0);
  86 }
  87
  88 MAKE_SCHEME_CALLBACK (Note_head, print, 1);
  89 SCM
  90 Note_head::print (SCM smob)
  91 {
  92   Grob *me = unsmob_grob (smob);
  93
  94   string idx;
  95   return internal_print (me, &idx).smobbed_copy ();
  96 }
  97
  98 Real
  99 Note_head::stem_attachment_coordinate (Grob *me, Axis a)
 100 {
 101   Offset off = robust_scm2offset (me->get_property ("stem-attachment"),
 102                                   Offset (0,0));
 103
 104   return off [a];
 105 }
 106
 107 Offset
 108 Note_head::get_stem_attachment (Font_metric *fm, string key)
 109 {
 110   Offset att;
 111
 112   int k = fm->name_to_index (key);
 113   if (k >= 0)
 114     {
 115       Box b = fm->get_indexed_char (k);
 116       Offset wxwy = fm->attachment_point (key);
 117       for (int i = X_AXIS ; i < NO_AXES; i++)
 118         {
 119           Axis a = Axis (i);
 120
 121           Interval v = b[a];
 122           if (!v.is_empty ())
 123             {
 124               att[a] = (2 * (wxwy[a] - v.center ()) / v.length ());
 125             }
 126         }
 127     }
 128
 129   return att;
 130 }
 131
 132 MAKE_SCHEME_CALLBACK (Note_head, calc_stem_attachment, 1);
 133 SCM
 134 Note_head::calc_stem_attachment (SCM smob)
 135 {
 136   Grob *me  = unsmob_grob (smob);
 137   Font_metric *fm = Font_interface::get_default_font (me);
 138   string key;
 139   internal_print (me, &key);
 140
 141   return ly_offset2scm (get_stem_attachment (fm, key));
 142 }
 143
 144
 145 ADD_INTERFACE (Note_head,
 146                "A note head.  There are many possible values for"
 147                " @code{style}.  For a complete list, see"
 148                " @ruser{Note head styles}.",
 149
 150                /* properties */
 151                "note-names "
 152                "accidental-grob "
 153                "glyph-name "
 154                "stem-attachment "
 155                "style "
 156                );
 157