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--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include <math.h>
   9
  10 #include "misc.hh"
  11 #include "dots.hh"
  12 #include "note-head.hh"
  13 #include "debug.hh"
  14 #include "font-interface.hh"
  15 #include "molecule.hh"
  16 #include "musical-request.hh"
  17
  18 #include "staff-symbol-referencer.hh"
  19
  20 /*
  21   build a ledger line for small pieces.
  22  */
  23 Molecule
  24 Note_head::ledger_line (Interval xwid, Grob *me)
  25 {
  26   Drul_array<Molecule> endings;
  27   endings[LEFT] = Font_interface::get_default_font (me)->find_by_name ("noteheads-ledgerending");
  28   Molecule *e = &endings[LEFT];
  29   endings[RIGHT] = *e;
  30
  31   Real thick = e->extent (Y_AXIS).length ();
  32   Real len = e->extent (X_AXIS).length () - thick;
  33
  34   Molecule total;
  35   Direction d = LEFT;
  36   do {
  37     endings[d].translate_axis (xwid[d] - endings[d].extent (X_AXIS)[d], X_AXIS);
  38     total.add_molecule (endings[d]);
  39   } while ((flip (&d)) != LEFT);
  40
  41   Real xpos = xwid [LEFT] + len;
  42
  43   while (xpos + len + thick /2 <= xwid[RIGHT])
  44     {
  45       e->translate_axis (len, X_AXIS);
  46       total.add_molecule (*e);
  47       xpos += len;
  48     }
  49
  50   return total;
  51 }
  52
  53
  54 MAKE_SCHEME_CALLBACK (Note_head,brew_molecule,1);
  55
  56 SCM
  57 Note_head::brew_molecule (SCM smob)
  58 {
  59   Grob *me = unsmob_grob (smob);
  60
  61
  62   Real inter_f = Staff_symbol_referencer::staff_space (me)/2;
  63   int sz = Staff_symbol_referencer::line_count (me)-1;
  64   int p = (int)  rint (Staff_symbol_referencer::position_f (me));
  65   int streepjes_i = abs (p) < sz
  66     ? 0
  67     : (abs (p) - sz) /2;
  68
  69   SCM style  = me->get_grob_property ("style");
  70   if (!gh_symbol_p (style))
  71     {
  72       return SCM_EOL;
  73     }
  74
  75   /*
  76     ugh: use gh_call ()
  77
  78     UGH: use grob-property.
  79   */
  80   Molecule out = Font_interface::get_default_font (me)->find_by_name (String ("noteheads-") +
  81                 ly_scm2string (scm_eval2 (gh_list (ly_symbol2scm ("find-notehead-symbol"),
  82                                                   me->get_grob_property ("duration-log"),
  83                                                   ly_quote_scm (style),
  84                                                   SCM_UNDEFINED),
  85                                           SCM_EOL)));
  86
  87   if (streepjes_i)
  88     {
  89       Direction dir = (Direction)sign (p);
  90       Interval hd = out.extent (X_AXIS);
  91       Real hw = hd.length ()/4;
  92       Molecule ledger (ledger_line (Interval (hd[LEFT] - hw,
  93                                                hd[RIGHT] + hw), me));
  94
  95
  96       ledger.set_empty (true);
  97       Real offs = (Staff_symbol_referencer::on_staffline (me))
  98         ? 0.0
  99         : -dir * inter_f;
 100
 101       for (int i=0; i < streepjes_i; i++)
 102         {
 103           Molecule s (ledger);
 104           s.translate_axis (-dir * inter_f * i*2 + offs,
 105                             Y_AXIS);
 106           out.add_molecule (s);
 107         }
 108     }
 109   return out.smobbed_copy ();
 110 }
 111
 112 bool
 113 Note_head::has_interface (Grob*m)
 114 {
 115   return m&& m->has_interface (ly_symbol2scm ("note-head-interface"));
 116 }
 117
 118
 119 MAKE_SCHEME_CALLBACK (Note_head,brew_ez_molecule,1);
 120
 121 SCM
 122 Note_head::brew_ez_molecule (SCM smob)
 123 {
 124   Grob *me = unsmob_grob (smob);
 125   int l = gh_scm2int (me->get_grob_property ("duration-log"));
 126
 127   int b = (l >= 2);
 128   SCM at = gh_list (ly_symbol2scm ("ez-ball"),
 129                     me->get_grob_property ("note-character"),
 130                     gh_int2scm (b),
 131                     gh_int2scm (1-b),
 132                     SCM_UNDEFINED);
 133   Box bx (Interval (0, 1.0), Interval (-0.5, 0.5));
 134   Molecule m (bx, at);
 135
 136   return m.smobbed_copy ();
 137 }
 138
 139
 140 Real
 141 Note_head::stem_attachment_coordinate (Grob *me, Axis a)
 142 {
 143   SCM v = me->get_grob_property ("stem-attachment-function");
 144
 145   if (!gh_procedure_p (v))
 146     return 0.0;
 147
 148   SCM st = me->get_grob_property ("style");
 149   SCM result = gh_apply (v, gh_list (st, SCM_UNDEFINED));
 150
 151   if (!gh_pair_p (result))
 152     return 0.0;
 153
 154   result = (a == X_AXIS) ? gh_car (result) : gh_cdr (result);
 155
 156   return gh_number_p (result) ?  gh_scm2double (result) : 0.0;
 157 }