lily/arpeggio.cc

   1 /*
   2   arpeggio.cc -- implement Arpeggio
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2002 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       programming_error ("Huh? Dumb blonde encountered?");
  60       /*
  61         Nee Valerie, jij bent _niet_ dom.
  62        */
  63       return SCM_EOL;
  64     }
  65
  66   Direction dir = CENTER;
  67   if (ly_dir_p (me->get_grob_property ("arpeggio-direction")))
  68     {
  69       dir = to_dir (me->get_grob_property ("arpeggio-direction"));
  70     }
  71
  72   Molecule mol;
  73   Font_metric *fm =Font_interface::get_default_font (me);
  74   Molecule squiggle = fm->find_by_name ("scripts-arpeggio");
  75
  76   Real arrow_space = (dir) ? Staff_symbol_referencer::staff_space (me)  : 0.0;
  77
  78   Real y = heads[LEFT];
  79   while (y < heads[RIGHT] - arrow_space)
  80     {
  81       mol.add_at_edge (Y_AXIS, UP,squiggle, 0.0);
  82       y+= squiggle. extent (Y_AXIS).length ();
  83     }
  84   mol.translate_axis (heads[LEFT], Y_AXIS);
  85   if (dir)
  86     mol.add_at_edge (Y_AXIS, dir,
  87                      fm->find_by_name ("scripts-arpeggio-arrow-" + to_string (dir)), 0.0);
  88
  89   return mol.smobbed_copy () ;
  90 }
  91
  92 /* Draws a vertical bracket to the left of a chord
  93    Chris Jackson <chris@fluffhouse.org.uk> */
  94
  95 MAKE_SCHEME_CALLBACK (Arpeggio, brew_chord_bracket, 1);
  96 SCM
  97 Arpeggio::brew_chord_bracket (SCM smob)
  98 {
  99   Grob *me = unsmob_grob (smob);
 100
 101   Grob * common = me;
 102   for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
 103     {
 104       Grob * stem =  unsmob_grob (ly_car (s));
 105       common =  common->common_refpoint (Staff_symbol_referencer::get_staff_symbol (stem),
 106                                  Y_AXIS);
 107     }
 108
 109   Interval heads;
 110   Real my_y = me->relative_coordinate (common, Y_AXIS);
 111
 112   for (SCM s = me->get_grob_property ("stems"); gh_pair_p (s); s = ly_cdr (s))
 113     {
 114       Grob * stem = unsmob_grob (ly_car (s));
 115       Grob * ss = Staff_symbol_referencer::get_staff_symbol (stem);
 116       Interval iv = Stem::head_positions (stem);
 117       iv *= Staff_symbol::staff_space (ss)/2.0;
 118       heads.unite (iv  +  ss->relative_coordinate (common, Y_AXIS)  -  my_y);
 119     }
 120
 121   Real lt =  me->get_paper ()->get_var ("linethickness");
 122   Real sp = 1.5 * Staff_symbol_referencer::staff_space (me);
 123   Real dy = heads.length() + sp;
 124   Real x = 0.7;
 125
 126   Molecule l1     = Lookup::line (lt, Offset(0, 0),  Offset (0, dy));
 127   Molecule bottom = Lookup::line (lt, Offset(0, 0),  Offset (x, 0));
 128   Molecule top    = Lookup::line (lt, Offset(0, dy), Offset (x, dy));
 129   Molecule mol;
 130   mol.add_molecule (l1);
 131   mol.add_molecule (bottom);
 132   mol.add_molecule (top);
 133   mol.translate_axis (heads[LEFT] - sp/2.0, Y_AXIS);
 134   return mol.smobbed_copy();
 135 }
 136
 137
 138 /*
 139   We have to do a callback, because brew_molecule () triggers a
 140   vertical alignment if it is cross-staff.
 141   This callback also adds padding.
 142 */
 143 MAKE_SCHEME_CALLBACK (Arpeggio, width_callback,2);
 144 SCM
 145 Arpeggio::width_callback (SCM smob, SCM axis)
 146 {
 147   Grob * me = unsmob_grob (smob);
 148   Axis a = (Axis)gh_scm2int (axis);
 149   assert (a == X_AXIS);
 150   Molecule arpeggio = Font_interface::get_default_font (me)->find_by_name ("scripts-arpeggio");
 151
 152   return ly_interval2scm (arpeggio.extent (X_AXIS) * 1.5);
 153 }
 154
 155
 156 ADD_INTERFACE (Arpeggio, "arpeggio-interface",
 157   "Functions and settings for drawing an arpeggio symbol (a wavy line left to noteheads.",
 158   "stems arpeggio-direction");
 159