lily/align-interface.cc

   1 /*
   2   align-interface.cc --  implement Align_interface
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "align-interface.hh"
  11 #include "grob.hh"
  12 #include "group-interface.hh"
  13 #include "axis-group-interface.hh"
  14 #include "hara-kiri-group-spanner.hh"
  15 #include "paper-def.hh"
  16
  17 MAKE_SCHEME_CALLBACK (Align_interface,alignment_callback,2);
  18 SCM
  19 Align_interface::alignment_callback (SCM element_smob, SCM axis)
  20 {
  21   Grob * me = unsmob_grob (element_smob);
  22   Axis ax = (Axis)gh_scm2int (axis);
  23   Grob * par = me->get_parent (ax);
  24   if (par && !to_boolean (par->get_grob_property ("alignment-done")))
  25     {
  26       Align_interface::align_elements_to_extents (par, ax);
  27     }
  28   return gh_double2scm (0.0);
  29 }
  30
  31 MAKE_SCHEME_CALLBACK (Align_interface,fixed_distance_alignment_callback,2);
  32 SCM
  33 Align_interface::fixed_distance_alignment_callback (SCM element_smob, SCM axis)
  34 {
  35   Grob * me = unsmob_grob (element_smob);
  36   Axis ax = (Axis)gh_scm2int (axis);
  37   Grob * par = me->get_parent (ax);
  38   if (par && !to_boolean (par->get_grob_property ("alignment-done")))
  39     {
  40       Align_interface::align_to_fixed_distance (par, ax);
  41     }
  42   return gh_double2scm (0.0);
  43 }
  44
  45 /*
  46   merge with align-to-extents?
  47  */
  48 void
  49 Align_interface::align_to_fixed_distance (Grob *me , Axis a)
  50 {
  51   me->set_grob_property ("alignment-done", SCM_BOOL_T);
  52
  53   SCM d =   me->get_grob_property ("stacking-dir");
  54
  55   Direction stacking_dir = gh_number_p (d) ? to_dir (d) : CENTER;
  56   if (!stacking_dir)
  57     stacking_dir = DOWN;
  58
  59   SCM force = me->get_grob_property ("forced-distance");
  60
  61   Real dy = 0.0;
  62   if (gh_number_p (force))
  63     {
  64       dy = gh_scm2double (force);
  65     }
  66
  67   Link_array<Grob> elems
  68     = Pointer_group_interface__extract_grobs (me, (Grob*) 0, "elements");
  69
  70   Real where_f=0;
  71
  72   Interval v;
  73   v.set_empty ();
  74   Array<Real> translates;
  75
  76   for (int j= elems.size (); j--; )
  77     {
  78       /*
  79         This is not very elegant, in that we need special support for
  80         hara kiri. Unfortunately, the generic wiring of
  81         force_hara_kiri_callback () (extent and offset callback) is
  82         such that we might get into a loop if we call extent() or
  83         offset() the elements.
  84
  85
  86        */
  87       if (a == Y_AXIS
  88           && Hara_kiri_group_spanner::has_interface (elems[j]))
  89         Hara_kiri_group_spanner::consider_suicide (elems[j]);
  90
  91       if (!elems[j]-> live())
  92         elems.del(j);
  93     }
  94
  95   for (int j =0; j < elems.size (); j++)
  96     {
  97       where_f += stacking_dir * dy;
  98       translates.push (where_f);
  99       v.unite (Interval (where_f, where_f));
 100     }
 101
 102   /*
 103     TODO: support self-alignment-{Y,X}
 104    */
 105   for (int i = 0; i < translates.size (); i++)
 106     {
 107       elems[i]->translate_axis (translates[i] - v.center (), a);
 108     }
 109 }
 110
 111 /*
 112   Hairy function to put elements where they should be. Can be tweaked
 113   from the outside by setting extra-space in its
 114   children
 115
 116   We assume that the children the refpoints of the children are still
 117   found at 0.0 -- we will fuck up with thresholds if children's
 118   extents are already moved to locations such as (-16, -8), since the
 119   dy needed to put things in a row doesn't relate to the distances
 120   between original refpoints.
 121
 122   TODO: maybe we should rethink and throw out thresholding altogether.
 123   The original function has been taken over by
 124   align_to_fixed_distance().
 125 */
 126 void
 127 Align_interface::align_elements_to_extents (Grob * me, Axis a)
 128 {
 129   me->set_grob_property ("alignment-done", SCM_BOOL_T);
 130
 131   SCM d =   me->get_grob_property ("stacking-dir");
 132
 133   Direction stacking_dir = gh_number_p (d) ? to_dir (d) : CENTER;
 134   if (!stacking_dir)
 135     stacking_dir = DOWN;
 136
 137   Interval threshold = Interval (0, Interval::infinity ());
 138   SCM thr = me->get_grob_property ("threshold");
 139   if (gh_pair_p (thr))
 140     {
 141       threshold[SMALLER] = gh_scm2double (ly_car (thr));
 142       threshold[BIGGER] = gh_scm2double (ly_cdr (thr));
 143     }
 144
 145
 146   Array<Interval> dims;
 147
 148   Link_array<Grob> elems;
 149   Link_array<Grob> all_grobs
 150     = Pointer_group_interface__extract_grobs (me, (Grob*) 0, "elements");
 151   for (int i=0; i < all_grobs.size (); i++)
 152     {
 153       Interval y = all_grobs[i]->extent (me, a);
 154       if (!y.empty_b ())
 155         {
 156           Grob *e =dynamic_cast<Grob*> (all_grobs[i]);
 157
 158           elems.push (e);
 159           dims.push (y);
 160         }
 161     }
 162
 163
 164   /*
 165     Read self-alignment-X and self-alignment-Y. This may seem like
 166     code duplication. (and really: it is), but this is necessary to
 167     prevent ugly cyclic dependencies that arise when you combine
 168     self-alignment on a child with alignment of children.
 169   */
 170  static SCM  prop_syms[2];
 171
 172   if (!prop_syms[0])
 173     {
 174       prop_syms[X_AXIS] = ly_symbol2scm ("self-alignment-X");
 175       prop_syms[Y_AXIS] = ly_symbol2scm ("self-alignment-Y");
 176     }
 177
 178   SCM align (me->internal_get_grob_property (prop_syms[a]));
 179
 180   Array<Real> translates ;
 181   Interval total;
 182   Real where_f=0;
 183
 184   for (int j=0 ;  j < elems.size (); j++)
 185     {
 186       Real dy = -  dims[j][-stacking_dir];
 187       if (j)
 188         dy += dims[j-1][stacking_dir];
 189
 190
 191       /*
 192         we want dy to be > 0
 193        */
 194       dy *= stacking_dir;
 195       if (j)
 196         {
 197           dy = (dy >? threshold[SMALLER])
 198             <? threshold[BIGGER];
 199         }
 200
 201       where_f += stacking_dir * dy;
 202       total.unite (dims[j] +   where_f);
 203       translates.push (where_f);
 204     }
 205
 206
 207   Grob * align_center = unsmob_grob (align);
 208   Real center_offset = 0.0;
 209
 210   /*
 211     also move the grobs that were empty, to maintain spatial order.
 212    */
 213   Array<Real> all_translates;
 214   if (translates.size ())
 215     {
 216       int i =0;
 217       int j =0;
 218       Real w = translates[0];
 219       while (j  < all_grobs.size ())
 220         {
 221           if (i < elems.size () && all_grobs[j] == elems[i])
 222             {
 223               w = translates[i++];
 224             }
 225           if (all_grobs[j] == align_center)
 226             center_offset = w;
 227           all_translates .push (w);
 228           j++;
 229         }
 230
 231
 232       /*
 233         FIXME: uncommenting freaks out the Y-alignment of
 234         line-of-score.
 235        */
 236       // Real align_param = ly_dir_p (align)  ? gh_scm2double (align) : 0.0;
 237
 238       if (gh_number_p (align))
 239         center_offset = total.linear_combination (gh_scm2double (align));
 240
 241       for (int j = 0 ;  j < all_grobs.size (); j++)
 242         all_grobs[j]->translate_axis (all_translates[j] - center_offset, a);
 243     }
 244 }
 245 Axis
 246 Align_interface::axis (Grob*me)
 247 {
 248   return  Axis (gh_scm2int (ly_car (me->get_grob_property ("axes"))));
 249 }
 250
 251 void
 252 Align_interface::add_element (Grob*me,Grob* s, SCM cb)
 253 {
 254   s->add_offset_callback (cb, Align_interface::axis (me));
 255   Axis_group_interface::add_element (me, s);
 256 }
 257
 258 void
 259 Align_interface::set_axis (Grob*me,Axis a)
 260 {
 261   Axis_group_interface::set_axes (me, a,a);
 262 }
 263
 264
 265
 266 ADD_INTERFACE (Align_interface, "align-interface",
 267   " Order grobs top to bottom/left to right/right to left etc.",
 268   "forced-distance stacking-dir align-dir threshold alignment-done center-element elements axes");
 269
 270
 271 struct Foobar
 272 {
 273   bool has_interface (Grob*);
 274 };