lily/slur.cc

   1 /*
   2   slur.cc -- implement external interface for Slur
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1996--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7   Jan Nieuwenhuizen <janneke@gnu.org>
   8 */
   9
  10 #include "slur.hh"
  11
  12 #include <math.h>
  13
  14 #include "beam.hh"
  15 #include "bezier.hh"
  16 #include "directional-element-interface.hh"
  17 #include "font-interface.hh"
  18 #include "pointer-group-interface.hh"
  19 #include "lookup.hh"
  20 #include "main.hh"              // DEBUG_SLUR_SCORING
  21 #include "note-column.hh"
  22 #include "output-def.hh"
  23 #include "spanner.hh"
  24 #include "staff-symbol-referencer.hh"
  25 #include "staff-symbol.hh"
  26 #include "stem.hh"
  27 #include "text-interface.hh"
  28 #include "warn.hh"
  29 #include "slur-scoring.hh"
  30
  31 static Direction
  32 get_default_dir (Grob *me)
  33 {
  34   extract_grob_set (me, "note-columns", encompasses);
  35
  36   Direction d = DOWN;
  37   for (int i = 0; i < encompasses.size (); i++)
  38     {
  39       if (Note_column::dir (encompasses[i]) < 0)
  40         {
  41           d = UP;
  42           break;
  43         }
  44     }
  45   return d;
  46 }
  47
  48 MAKE_SCHEME_CALLBACK (Slur, height, 2);
  49 SCM
  50 Slur::height (SCM smob, SCM ax)
  51 {
  52   Axis a = (Axis)scm_to_int (ax);
  53   Grob *me = unsmob_grob (smob);
  54   assert (a == Y_AXIS);
  55
  56   SCM mol = me->get_uncached_stencil ();
  57   Interval ext;
  58   if (Stencil *m = unsmob_stencil (mol))
  59     ext = m->extent (a);
  60   return ly_interval2scm (ext);
  61 }
  62
  63 /*
  64   Ugh should have dash-length + dash-period
  65 */
  66 MAKE_SCHEME_CALLBACK (Slur, print, 1);
  67 SCM
  68 Slur::print (SCM smob)
  69 {
  70   Grob *me = unsmob_grob (smob);
  71   extract_grob_set (me, "note-columns", encompasses);
  72   if (encompasses.is_empty ())
  73     {
  74       me->suicide ();
  75       return SCM_EOL;
  76     }
  77
  78   Real staff_thick = Staff_symbol_referencer::line_thickness (me);
  79   Real base_thick = robust_scm2double (me->get_property ("thickness"), 1);
  80   Real thick = base_thick * staff_thick;
  81   Bezier one = get_curve (me);
  82   Stencil a;
  83
  84   /*
  85     TODO: replace dashed with generic property.
  86   */
  87   SCM p = me->get_property ("dash-period");
  88   SCM f = me->get_property ("dash-fraction");
  89   if (scm_is_number (p) && scm_is_number (f))
  90     a = Lookup::dashed_slur (one, thick, robust_scm2double (p, 1.0),
  91                              robust_scm2double (f, 0));
  92   else
  93     a = Lookup::slur (one,
  94                       get_grob_direction (me) * staff_thick * 1.0,
  95                       thick);
  96
  97 #if DEBUG_SLUR_SCORING
  98   SCM quant_score = me->get_property ("quant-score");
  99
 100   if (to_boolean (me->get_layout ()
 101                   ->lookup_variable (ly_symbol2scm ("debug-slur-scoring")))
 102       && scm_is_string (quant_score))
 103     {
 104       String str;
 105       SCM properties = Font_interface::text_font_alist_chain (me);
 106
 107       Stencil tm = *unsmob_stencil (Text_interface::interpret_markup
 108                                     (me->get_layout ()->self_scm (), properties,
 109                                      quant_score));
 110       a.add_at_edge (Y_AXIS, get_grob_direction (me), tm, 1.0, 0);
 111     }
 112 #endif
 113
 114   return a.smobbed_copy ();
 115 }
 116
 117 Bezier
 118 Slur::get_curve (Grob *me)
 119 {
 120   Bezier b;
 121   int i = 0;
 122   for (SCM s = me->get_property ("control-points"); s != SCM_EOL;
 123        s = scm_cdr (s))
 124     b.control_[i++] = ly_scm2offset (scm_car (s));
 125
 126   return b;
 127 }
 128
 129 void
 130 Slur::add_column (Grob *me, Grob *n)
 131 {
 132   Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-columns"), n);
 133   add_bound_item (dynamic_cast<Spanner *> (me), dynamic_cast<Item *> (n));
 134 }
 135
 136 void
 137 Slur::add_extra_encompass (Grob *me, Grob *n)
 138 {
 139   Pointer_group_interface::add_grob (me, ly_symbol2scm ("encompass-objects"), n);
 140   me->add_dependency (n);
 141 }
 142
 143 #include "script-interface.hh"
 144 MAKE_SCHEME_CALLBACK (Slur, outside_slur_callback, 2);
 145 SCM
 146 Slur::outside_slur_callback (SCM grob, SCM axis)
 147 {
 148   Grob *script = unsmob_grob (grob);
 149   Axis a = Axis (scm_to_int (axis));
 150   (void) a;
 151   assert (a == Y_AXIS);
 152
 153   Grob *slur = unsmob_grob (script->get_object ("slur"));
 154
 155   if (!slur)
 156     return scm_from_int (0);
 157
 158   Direction dir = get_grob_direction (script);
 159   if (dir == CENTER)
 160     return scm_from_int (0);
 161
 162   /* FIXME: this dependency should be automatic.  */
 163   if (scm_ilength (slur->get_property ("control-points")) < 4)
 164     Slur::after_line_breaking (slur->self_scm ());
 165
 166   Grob *cx = script->common_refpoint (slur, X_AXIS);
 167   Grob *cy = script->common_refpoint (slur, Y_AXIS);
 168
 169   Bezier curve = Slur::get_curve (slur);
 170
 171   curve.translate (Offset (slur->relative_coordinate (cx, X_AXIS),
 172                            slur->relative_coordinate (cy, Y_AXIS)));
 173
 174   Interval yext = robust_relative_extent (script, cy, Y_AXIS);
 175   Interval xext = robust_relative_extent (script, cx, X_AXIS);
 176
 177   /* FIXME: slur property, script property?  */
 178   Real slur_padding = robust_scm2double (script->get_property ("slur-padding"),
 179                                          0.0);
 180   yext.widen (slur_padding);
 181
 182   Real EPS = 1e-3;
 183   Interval bezext (curve.control_[0][X_AXIS], curve.control_[3][X_AXIS]);
 184   bool consider[] = { false, false, false };
 185   Real ys[] = {0, 0, 0};
 186   bool do_shift = false;
 187
 188   for (int d = LEFT, k = 0; d <= RIGHT; d++, k++)
 189     {
 190       Real x = xext.linear_combination ((Direction) d);
 191       consider[k] = bezext.contains (x);
 192
 193       if (consider[k])
 194         {
 195           ys[k]
 196             = (fabs (bezext[LEFT] - x) < EPS)
 197             ? curve.control_[0][Y_AXIS]
 198             : ((fabs (bezext[RIGHT] - x) < EPS)
 199                ? curve.control_[3][Y_AXIS]
 200                : curve.get_other_coordinate (X_AXIS, x));
 201           consider[k] = true;
 202
 203           /* Request shift if slur is contained script's Y, or if
 204              script is fully inside slur.  */
 205           if (yext.contains (ys[k]) || dir * ys[k] > dir * yext[-dir])
 206             do_shift = true;
 207         }
 208     }
 209   Real offset = 0.0;
 210   if (do_shift)
 211     {
 212       for (int d = LEFT, k = 0; d <= RIGHT; d++, k++)
 213         offset = dir * (max (dir * offset,
 214                              dir * (ys[k] - yext[-dir] + dir * slur_padding)));
 215     }
 216
 217   return scm_from_double (offset);
 218 }
 219
 220 MAKE_SCHEME_CALLBACK (Slur, after_line_breaking, 1);
 221 SCM
 222 Slur::after_line_breaking (SCM smob)
 223 {
 224   Spanner *me = dynamic_cast<Spanner *> (unsmob_grob (smob));
 225   extract_grob_set (me, "note-columns", encompasses);
 226   if (encompasses.is_empty ())
 227     {
 228       me->suicide ();
 229       return SCM_UNSPECIFIED;
 230     }
 231
 232   if (!get_grob_direction (me))
 233     set_grob_direction (me, get_default_dir (me));
 234
 235   if (scm_ilength (me->get_property ("control-points")) < 4)
 236     set_slur_control_points (me);
 237
 238   return SCM_UNSPECIFIED;
 239 }
 240
 241 ADD_INTERFACE (Slur, "slur-interface",
 242                "A slur",
 243                "positions quant-score eccentricity encompass-objects control-points dash-period dash-fraction slur-details direction height-limit note-columns ratio thickness");
 244