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 Molecule
  55 Note_head::ledger_lines (Grob*me, int count, Direction dir, Interval idw)
  56 {
  57   Real inter_f = Staff_symbol_referencer::staff_space (me)/2;
  58   Molecule ledger (ledger_line (idw, me));
  59
  60   ledger.set_empty (true);
  61   Real offs = (Staff_symbol_referencer::on_staffline (me))
  62     ? 0.0
  63     : -dir * inter_f;
  64
  65   Molecule legs;
  66   for (int i=0; i < count; i++)
  67     {
  68       Molecule s (ledger);
  69       s.translate_axis (-dir * inter_f * i*2 + offs,
  70                         Y_AXIS);
  71       legs.add_molecule (s);
  72     }
  73
  74   return legs;
  75 }
  76
  77 MAKE_SCHEME_CALLBACK (Note_head,brew_molecule,1);
  78
  79 SCM
  80 Note_head::brew_molecule (SCM smob)
  81 {
  82   Grob *me = unsmob_grob (smob);
  83
  84   int sz = Staff_symbol_referencer::line_count (me)-1;
  85   int p = (int)  rint (Staff_symbol_referencer::position_f (me));
  86   int streepjes_i = abs (p) < sz
  87     ? 0
  88     : (abs (p) - sz) /2;
  89
  90   SCM style  = me->get_grob_property ("style");
  91   if (!gh_symbol_p (style))
  92     {
  93       return SCM_EOL;
  94     }
  95
  96   /*
  97     ugh: use gh_call () / scm_apply ().
  98
  99     UGH: use grob-property.
 100   */
 101   Molecule out = Font_interface::get_default_font (me)->find_by_name (String ("noteheads-") +
 102                 ly_scm2string (scm_primitive_eval (gh_list (ly_symbol2scm ("find-notehead-symbol"),
 103                                                   me->get_grob_property ("duration-log"),
 104                                                   ly_quote_scm (style),
 105                                                             SCM_UNDEFINED))));
 106
 107   if (streepjes_i)
 108     {
 109       Direction dir = (Direction)sign (p);
 110       Interval hd = out.extent (X_AXIS);
 111       Real hw = hd.length ()/4;
 112       out.add_molecule (ledger_lines (me, streepjes_i, dir,
 113                                       Interval (hd[LEFT] - hw,
 114                                                 hd[RIGHT] + hw)));
 115     }
 116
 117   return out.smobbed_copy ();
 118 }
 119
 120 bool
 121 Note_head::has_interface (Grob*m)
 122 {
 123   return m&& m->has_interface (ly_symbol2scm ("note-head-interface"));
 124 }
 125
 126
 127 MAKE_SCHEME_CALLBACK (Note_head,brew_ez_molecule,1);
 128
 129 SCM
 130 Note_head::brew_ez_molecule (SCM smob)
 131 {
 132   Grob *me = unsmob_grob (smob);
 133   int l = gh_scm2int (me->get_grob_property ("duration-log"));
 134
 135   int b = (l >= 2);
 136   SCM at = gh_list (ly_symbol2scm ("ez-ball"),
 137                     me->get_grob_property ("note-character"),
 138                     gh_int2scm (b),
 139                     gh_int2scm (1-b),
 140                     SCM_UNDEFINED);
 141   Box bx (Interval (0, 1.0), Interval (-0.5, 0.5));
 142   Molecule m (bx, at);
 143   int p = (int)  rint (Staff_symbol_referencer::position_f (me));
 144
 145   int sz = Staff_symbol_referencer::line_count (me)-1;
 146   int streepjes_i = abs (p) < sz
 147     ? 0
 148     : (abs (p) - sz) /2;
 149
 150  if (streepjes_i)
 151    {
 152       Direction dir = (Direction)sign (p);
 153       Interval hd = m.extent (X_AXIS);
 154       Real hw = hd.length ()/4;
 155       m.add_molecule (ledger_lines (me, streepjes_i, dir,
 156                                       Interval (hd[LEFT] - hw,
 157                                                 hd[RIGHT] + hw)));
 158     }
 159
 160   return m.smobbed_copy ();
 161 }
 162
 163
 164 Real
 165 Note_head::stem_attachment_coordinate (Grob *me, Axis a)
 166 {
 167   SCM v = me->get_grob_property ("stem-attachment-function");
 168
 169   if (!gh_procedure_p (v))
 170     return 0.0;
 171
 172   SCM st = me->get_grob_property ("style");
 173   SCM result = gh_apply (v, gh_list (st, SCM_UNDEFINED));
 174
 175   if (!gh_pair_p (result))
 176     return 0.0;
 177
 178   result = (a == X_AXIS) ? gh_car (result) : gh_cdr (result);
 179
 180   return gh_number_p (result) ?  gh_scm2double (result) : 0.0;
 181 }