lily/arpeggio.cc

   1 /*
   2   arpeggio.cc -- implement Arpeggio
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2003 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "molecule.hh"
  10 #include "paper-def.hh"
  11 #include "arpeggio.hh"
  12 #include "grob.hh"
  13 #include "stem.hh"
  14 #include "staff-symbol-referencer.hh"
  15 #include "staff-symbol.hh"
  16 #include "warn.hh"
  17 #include "font-interface.hh"
  18 #include "lookup.hh"
  19
  20
  21 MAKE_SCHEME_CALLBACK (Arpeggio, brew_molecule, 1);
  22 SCM
  23 Arpeggio::brew_molecule (SCM smob)
  24 {
  25   Grob *me = unsmob_grob (smob);
  26
  27   Grob * common = me;
  28   for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
  29     {
  30       Grob * stem =  unsmob_grob (ly_car (s));
  31       common =  common->common_refpoint (Staff_symbol_referencer::get_staff_symbol (stem),
  32                                  Y_AXIS);
  33     }
  34
  35   /*
  36     TODO:
  37
  38     Using stems here is not very convenient; should store noteheads
  39     instead, and also put them into the support. Now we will mess up
  40     in vicinity of a collision.
  41
  42   */
  43   Interval heads;
  44   Real my_y = me->relative_coordinate (common, Y_AXIS);
  45
  46   for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
  47     {
  48       Grob * stem = unsmob_grob (ly_car (s));
  49       Grob * ss = Staff_symbol_referencer::get_staff_symbol (stem);
  50       Interval iv =Stem::head_positions (stem);
  51       iv *= Staff_symbol::staff_space (ss)/2.0;
  52
  53       heads.unite (iv + ss->relative_coordinate (common, Y_AXIS)
  54                    - my_y);
  55     }
  56
  57   if (heads.empty_b ())
  58     {
  59       /*
  60         Dumb blonde error
  61
  62         :-)
  63        */
  64       programming_error ("Huh, no heads for arpeggio found.");
  65       return SCM_EOL;
  66     }
  67
  68   Direction dir = CENTER;
  69   if (ly_dir_p (me->get_grob_property ("arpeggio-direction")))
  70     {
  71       dir = to_dir (me->get_grob_property ("arpeggio-direction"));
  72     }
  73
  74   Molecule mol;
  75   Font_metric *fm =Font_interface::get_default_font (me);
  76   Molecule squiggle = fm->find_by_name ("scripts-arpeggio");
  77
  78   Real arrow_space = (dir) ? Staff_symbol_referencer::staff_space (me)  : 0.0;
  79
  80   Real y = heads[LEFT];
  81   while (y < heads[RIGHT] - arrow_space)
  82     {
  83       mol.add_at_edge (Y_AXIS, UP,squiggle, 0.0, 0);
  84       y+= squiggle. extent (Y_AXIS).length ();
  85     }
  86   mol.translate_axis (heads[LEFT], Y_AXIS);
  87   if (dir)
  88     mol.add_at_edge (Y_AXIS, dir,
  89                      fm->find_by_name ("scripts-arpeggio-arrow-" + to_string (dir)), 0.0, 0);
  90
  91   return mol.smobbed_copy () ;
  92 }
  93
  94 /* Draws a vertical bracket to the left of a chord
  95    Chris Jackson <chris@fluffhouse.org.uk> */
  96
  97 MAKE_SCHEME_CALLBACK (Arpeggio, brew_chord_bracket, 1);
  98 SCM
  99 Arpeggio::brew_chord_bracket (SCM smob)
 100 {
 101   Grob *me = unsmob_grob (smob);
 102
 103   Grob * common = me;
 104   for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
 105     {
 106       Grob * stem =  unsmob_grob (ly_car (s));
 107       common =  common->common_refpoint (Staff_symbol_referencer::get_staff_symbol (stem),
 108                                  Y_AXIS);
 109     }
 110
 111   Interval heads;
 112   Real my_y = me->relative_coordinate (common, Y_AXIS);
 113
 114   for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
 115     {
 116       Grob * stem = unsmob_grob (ly_car (s));
 117       Grob * ss = Staff_symbol_referencer::get_staff_symbol (stem);
 118       Interval iv = Stem::head_positions (stem);
 119       iv *= Staff_symbol::staff_space (ss)/2.0;
 120       heads.unite (iv  +  ss->relative_coordinate (common, Y_AXIS)  -  my_y);
 121     }
 122
 123   Real lt =  me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
 124   Real sp = 1.5 * Staff_symbol_referencer::staff_space (me);
 125   Real dy = heads.length() + sp;
 126   Real x = 0.7;
 127
 128   Molecule l1     = Lookup::line (lt, Offset(0, 0),  Offset (0, dy));
 129   Molecule bottom = Lookup::line (lt, Offset(0, 0),  Offset (x, 0));
 130   Molecule top    = Lookup::line (lt, Offset(0, dy), Offset (x, dy));
 131   Molecule mol;
 132   mol.add_molecule (l1);
 133   mol.add_molecule (bottom);
 134   mol.add_molecule (top);
 135   mol.translate_axis (heads[LEFT] - sp/2.0, Y_AXIS);
 136   return mol.smobbed_copy();
 137 }
 138
 139
 140 /*
 141   We have to do a callback, because brew_molecule () triggers a
 142   vertical alignment if it is cross-staff.
 143   This callback also adds padding.
 144 */
 145 MAKE_SCHEME_CALLBACK (Arpeggio, width_callback,2);
 146 SCM
 147 Arpeggio::width_callback (SCM smob, SCM axis)
 148 {
 149   Grob * me = unsmob_grob (smob);
 150   Axis a = (Axis)gh_scm2int (axis);
 151   assert (a == X_AXIS);
 152   Molecule arpeggio = Font_interface::get_default_font (me)->find_by_name ("scripts-arpeggio");
 153
 154   return ly_interval2scm (arpeggio.extent (X_AXIS) * 1.5);
 155 }
 156
 157
 158 ADD_INTERFACE (Arpeggio, "arpeggio-interface",
 159   "Functions and settings for drawing an arpeggio symbol (a wavy line left to noteheads.",
 160   "stems arpeggio-direction");
 161