lily/arpeggio.cc

   1 /*
   2   arpeggio.cc -- implement Arpeggio
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2007 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "arpeggio.hh"
  10
  11 #include "bezier.hh"
  12 #include "font-interface.hh"
  13 #include "grob.hh"
  14 #include "lookup.hh"
  15 #include "output-def.hh"
  16 #include "pointer-group-interface.hh"
  17 #include "staff-symbol-referencer.hh"
  18 #include "staff-symbol.hh"
  19 #include "stem.hh"
  20 #include "warn.hh"
  21
  22 Grob *
  23 Arpeggio::get_common_y (Grob *me)
  24 {
  25   Grob *common = me;
  26
  27   extract_grob_set (me, "stems", stems);
  28   for (vsize i = 0; i < stems.size (); i++)
  29     {
  30       Grob *stem = stems[i];
  31       common = common->common_refpoint (Staff_symbol_referencer::get_staff_symbol (stem),
  32                                         Y_AXIS);
  33     }
  34
  35   return common;
  36 }
  37
  38 MAKE_SCHEME_CALLBACK(Arpeggio, calc_positions, 1);
  39 SCM
  40 Arpeggio::calc_positions (SCM grob)
  41 {
  42   Grob *me = unsmob_grob (grob);
  43   Grob *common = get_common_y (me);
  44
  45   /*
  46     TODO:
  47
  48     Using stems here is not very convenient; should store noteheads
  49     instead, and also put them into the support. Now we will mess up
  50     in vicinity of a collision.
  51   */
  52   Interval heads;
  53   Real my_y = me->relative_coordinate (common, Y_AXIS);
  54
  55   extract_grob_set (me, "stems", stems);
  56   for (vsize i = 0; i < stems.size (); i++)
  57     {
  58       Grob *stem = stems[i];
  59       Grob *ss = Staff_symbol_referencer::get_staff_symbol (stem);
  60       Interval iv = Stem::head_positions (stem);
  61       iv *= Staff_symbol::staff_space (ss) / 2.0;
  62
  63       heads.unite (iv + ss->relative_coordinate (common, Y_AXIS)
  64                    - my_y);
  65     }
  66
  67   heads *= 1/Staff_symbol_referencer::staff_space(me);
  68
  69   return ly_interval2scm (heads);
  70 }
  71
  72 MAKE_SCHEME_CALLBACK (Arpeggio, print, 1);
  73 SCM
  74 Arpeggio::print (SCM smob)
  75 {
  76   Grob *me = unsmob_grob (smob);
  77   Interval heads = robust_scm2interval (me->get_property ("positions"),
  78                                         Interval())
  79     * Staff_symbol_referencer::staff_space (me);
  80
  81   if (heads.is_empty () || heads.length () < 0.5)
  82     {
  83       if (!to_boolean (me->get_property ("transparent")))
  84         {
  85           me->warning ("no heads for arpeggio found?");
  86           me->suicide ();
  87         }
  88       return SCM_EOL;
  89     }
  90
  91   SCM ad = me->get_property ("arpeggio-direction");
  92   Direction dir = CENTER;
  93   if (is_direction (ad))
  94     dir = to_dir (ad);
  95
  96   Stencil mol;
  97   Font_metric *fm = Font_interface::get_default_font (me);
  98   Stencil squiggle = fm->find_by_name ("scripts.arpeggio");
  99
 100   Stencil arrow;
 101   if (dir)
 102     {
 103       arrow = fm->find_by_name ("scripts.arpeggio.arrow." + to_string (dir));
 104       heads[dir] -= dir * arrow.extent (Y_AXIS).length ();
 105     }
 106
 107   for (Real y = heads[LEFT]; y < heads[RIGHT];
 108        y += squiggle.extent (Y_AXIS).length ())
 109     mol.add_at_edge (Y_AXIS, UP, squiggle, 0.0);
 110
 111   mol.translate_axis (heads[LEFT], Y_AXIS);
 112   if (dir)
 113     mol.add_at_edge (Y_AXIS, dir, arrow, 0);
 114
 115   return mol.smobbed_copy ();
 116 }
 117
 118 /* Draws a vertical bracket to the left of a chord
 119    Chris Jackson <chris@fluffhouse.org.uk> */
 120
 121 MAKE_SCHEME_CALLBACK (Arpeggio, brew_chord_bracket, 1);
 122 SCM
 123 Arpeggio::brew_chord_bracket (SCM smob)
 124 {
 125   Grob *me = unsmob_grob (smob);
 126   Interval heads = robust_scm2interval (me->get_property ("positions"),
 127                                         Interval())
 128     * Staff_symbol_referencer::staff_space (me);
 129
 130   Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 131   Real sp = 1.5 * Staff_symbol_referencer::staff_space (me);
 132   Real dy = heads.length () + sp;
 133   Real x = 0.7;
 134
 135   Stencil mol (Lookup::bracket (Y_AXIS, Interval (0, dy), lt, x, lt));
 136   mol.translate_axis (heads[LEFT] - sp / 2.0, Y_AXIS);
 137   return mol.smobbed_copy ();
 138 }
 139
 140 MAKE_SCHEME_CALLBACK (Arpeggio, brew_chord_slur, 1);
 141 SCM
 142 Arpeggio::brew_chord_slur (SCM smob)
 143 {
 144   Grob *me = unsmob_grob (smob);
 145   Interval heads = robust_scm2interval (me->get_property ("positions"),
 146                                         Interval())
 147     * Staff_symbol_referencer::staff_space (me);
 148
 149   Real lt = me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 150   Real dy = heads.length ();
 151
 152   Real height_limit = 1.5;
 153   Real ratio = .33;
 154   Bezier curve = slur_shape (dy, height_limit, ratio);
 155   curve.rotate (M_PI / 2);
 156
 157   Stencil mol (Lookup::slur (curve, lt, lt));
 158   mol.translate_axis (heads[LEFT], Y_AXIS);
 159   return mol.smobbed_copy ();
 160 }
 161
 162 /*
 163   We have to do a callback, because print () triggers a
 164   vertical alignment if it is cross-staff.
 165 */
 166 MAKE_SCHEME_CALLBACK (Arpeggio, width, 1);
 167 SCM
 168 Arpeggio::width (SCM smob)
 169 {
 170   Grob *me = unsmob_grob (smob);
 171   Stencil arpeggio = Font_interface::get_default_font (me)->find_by_name ("scripts.arpeggio");
 172
 173   return ly_interval2scm (arpeggio.extent (X_AXIS));
 174 }
 175
 176 MAKE_SCHEME_CALLBACK (Arpeggio, height, 1);
 177 SCM
 178 Arpeggio::height (SCM smob)
 179 {
 180   return Grob::stencil_height (smob);
 181 }
 182
 183 MAKE_SCHEME_CALLBACK (Arpeggio, pure_height, 3);
 184 SCM
 185 Arpeggio::pure_height (SCM smob, SCM, SCM)
 186 {
 187   Grob *me = unsmob_grob (smob);
 188   if (to_boolean (me->get_property ("cross-staff")))
 189     return ly_interval2scm (Interval ());
 190
 191   return height (smob);
 192 }
 193
 194 ADD_INTERFACE (Arpeggio,
 195                "Functions and settings for drawing an arpeggio symbol (a"
 196                " wavy line left to noteheads.",
 197
 198                /* properties */
 199                "arpeggio-direction "
 200                "positions "
 201                "script-priority " // TODO: make around-note-interface
 202                "stems "
 203                );
 204