lily/arpeggio.cc

   1 /*
   2   arpeggio.cc -- implement Arpeggio
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7  */
   8
   9 #include "stencil.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, print, 1);
  22 SCM
  23 Arpeggio::print (SCM smob)
  24 {
  25   Grob *me = unsmob_grob (smob);
  26
  27   Grob * common = me;
  28   for (SCM s = me->get_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_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.is_empty ())
  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   SCM ad = me->get_property ("arpeggio-direction");
  69   Direction dir = CENTER;
  70   if (is_direction (ad))
  71     {
  72       dir = to_dir (ad);
  73     }
  74
  75   Stencil mol;
  76   Font_metric *fm =Font_interface::get_default_font (me);
  77   Stencil squiggle = fm->find_by_name ("scripts-arpeggio");
  78
  79   Stencil arrow ;
  80   if (dir)
  81     {
  82       arrow = fm->find_by_name ("scripts-arpeggio-arrow-" + to_string (dir));
  83       heads[dir] -= dir * arrow.extent (Y_AXIS).length ();
  84     }
  85
  86   for (Real  y= heads[LEFT] ; y < heads[RIGHT];
  87        y+= squiggle. extent (Y_AXIS).length ())
  88       mol.add_at_edge (Y_AXIS, UP,squiggle, 0.0, 0);
  89
  90   mol.translate_axis (heads[LEFT], Y_AXIS);
  91   if (dir)
  92     mol.add_at_edge (Y_AXIS, dir,arrow, 0,0);
  93
  94   return mol.smobbed_copy () ;
  95 }
  96
  97 /* Draws a vertical bracket to the left of a chord
  98    Chris Jackson <chris@fluffhouse.org.uk> */
  99
 100 MAKE_SCHEME_CALLBACK (Arpeggio, brew_chord_bracket, 1);
 101 SCM
 102 Arpeggio::brew_chord_bracket (SCM smob)
 103 {
 104   Grob *me = unsmob_grob (smob);
 105
 106   Grob * common = me;
 107   for (SCM s = me->get_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
 108     {
 109       Grob * stem =  unsmob_grob (ly_car (s));
 110       common =  common->common_refpoint (Staff_symbol_referencer::get_staff_symbol (stem),
 111                                  Y_AXIS);
 112     }
 113
 114   Interval heads;
 115   Real my_y = me->relative_coordinate (common, Y_AXIS);
 116
 117   for (SCM s = me->get_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
 118     {
 119       Grob * stem = unsmob_grob (ly_car (s));
 120       Grob * ss = Staff_symbol_referencer::get_staff_symbol (stem);
 121       Interval iv = Stem::head_positions (stem);
 122       iv *= Staff_symbol::staff_space (ss)/2.0;
 123       heads.unite (iv  +  ss->relative_coordinate (common, Y_AXIS)  -  my_y);
 124     }
 125
 126   Real lt =  me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
 127   Real sp = 1.5 * Staff_symbol_referencer::staff_space (me);
 128   Real dy = heads.length () + sp;
 129   Real x = 0.7;
 130
 131   Stencil mol (Lookup::bracket (Y_AXIS, Interval (0, dy), lt, x, lt));
 132   mol.translate_axis (heads[LEFT] - sp/2.0, Y_AXIS);
 133   return mol.smobbed_copy ();
 134 }
 135
 136
 137 /*
 138   We have to do a callback, because print () triggers a
 139   vertical alignment if it is cross-staff.
 140 */
 141 MAKE_SCHEME_CALLBACK (Arpeggio, width_callback,2);
 142 SCM
 143 Arpeggio::width_callback (SCM smob, SCM axis)
 144 {
 145   Grob * me = unsmob_grob (smob);
 146   Axis a = (Axis)gh_scm2int (axis);
 147   assert (a == X_AXIS);
 148   Stencil arpeggio = Font_interface::get_default_font (me)->find_by_name ("scripts-arpeggio");
 149
 150   return ly_interval2scm (arpeggio.extent (X_AXIS));
 151 }
 152
 153
 154 ADD_INTERFACE (Arpeggio, "arpeggio-interface",
 155   "Functions and settings for drawing an arpeggio symbol (a wavy line left to noteheads.",
 156   "stems arpeggio-direction");
 157