lily/side-position-interface.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1998--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "side-position-interface.hh"
  21
  22 #include <cmath>                // ceil.
  23 #include <algorithm>
  24
  25 using namespace std;
  26
  27 #include "axis-group-interface.hh"
  28 #include "directional-element-interface.hh"
  29 #include "grob.hh"
  30 #include "grob-array.hh"
  31 #include "main.hh"
  32 #include "misc.hh"
  33 #include "note-head.hh"
  34 #include "pointer-group-interface.hh"
  35 #include "staff-symbol-referencer.hh"
  36 #include "staff-symbol.hh"
  37 #include "stem.hh"
  38 #include "string-convert.hh"
  39 #include "system.hh"
  40 #include "warn.hh"
  41
  42 void
  43 Side_position_interface::add_support (Grob *me, Grob *e)
  44 {
  45   Pointer_group_interface::add_unordered_grob (me, ly_symbol2scm ("side-support-elements"), e);
  46 }
  47
  48 /* Put the element next to the support, optionally taking in
  49    account the extent of the support.
  50
  51    Does not take into account the extent of ME.
  52 */
  53 SCM
  54 Side_position_interface::general_side_position (Grob *me, Axis a, bool use_extents,
  55                                                 bool include_my_extent,
  56                                                 bool pure, int start, int end,
  57                                                 Real *current_offset)
  58 {
  59   Real ss = Staff_symbol_referencer::staff_space (me);
  60
  61   extract_grob_set (me, "side-support-elements", support);
  62
  63   Grob *common = common_refpoint_of_array (support, me->get_parent (a), a);
  64   Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (me);
  65   bool include_staff =
  66     staff_symbol
  67     && a == Y_AXIS
  68     && scm_is_number (me->get_property ("staff-padding"))
  69     && !to_boolean (me->get_property ("quantize-position"));
  70
  71   Interval dim;
  72   Interval staff_extents;
  73   if (include_staff)
  74     {
  75       common = staff_symbol->common_refpoint (common, Y_AXIS);
  76       staff_extents = staff_symbol->maybe_pure_extent (common, Y_AXIS, pure, start, end);
  77
  78       if (include_staff)
  79         dim.unite (staff_extents);
  80     }
  81
  82   Direction dir = get_grob_direction (me);
  83
  84   for (vsize i = 0; i < support.size (); i++)
  85     {
  86       Grob *e = support[i];
  87
  88       // In the case of a stem, we will find a note head as well
  89       // ignoring the stem solves cyclic dependencies if the stem is
  90       // attached to a cross-staff beam.
  91       if (a == Y_AXIS
  92           && Stem::has_interface (e)
  93           && dir == - get_grob_direction (e))
  94         continue;
  95
  96       if (e)
  97         {
  98           if (use_extents)
  99             dim.unite (e->maybe_pure_extent (common, a, pure, start, end));
 100           else
 101             {
 102               Real x = e->maybe_pure_coordinate (common, a, pure, start, end);
 103               dim.unite (Interval (x, x));
 104             }
 105         }
 106     }
 107
 108   if (dim.is_empty ())
 109     dim = Interval (0, 0);
 110
 111   Real off = me->get_parent (a)->maybe_pure_coordinate (common, a, pure, start, end);
 112   Real minimum_space = ss * robust_scm2double (me->get_property ("minimum-space"), -1);
 113
 114   Real total_off = dim.linear_combination (dir) - off;
 115   total_off += dir * ss * robust_scm2double (me->get_property ("padding"), 0);
 116
 117   if (minimum_space >= 0
 118       && dir
 119       && total_off * dir < minimum_space)
 120     total_off = minimum_space * dir;
 121
 122   if (include_my_extent)
 123     {
 124       Interval iv = me->maybe_pure_extent (me, a, pure, start, end);
 125       if (!iv.is_empty ())
 126         {
 127           if (!dir)
 128             {
 129               programming_error ("direction unknown, but aligned-side wanted");
 130               dir = DOWN;
 131             }
 132           total_off += -iv[-dir];
 133         }
 134     }
 135
 136   if (current_offset)
 137     total_off = dir * max (dir * total_off,
 138                            dir * (*current_offset));
 139
 140
 141   /* FIXME: 1000 should relate to paper size.  */
 142   if (fabs (total_off) > 1000)
 143     {
 144       string msg
 145         = String_convert::form_string ("Improbable offset for grob %s: %f",
 146                                        me->name ().c_str (), total_off);
 147
 148       programming_error (msg);
 149       if (strict_infinity_checking)
 150         scm_misc_error (__FUNCTION__, "Improbable offset.", SCM_EOL);
 151     }
 152   return scm_from_double (total_off);
 153 }
 154
 155
 156 MAKE_SCHEME_CALLBACK (Side_position_interface, y_aligned_on_support_refpoints, 1);
 157 SCM
 158 Side_position_interface::y_aligned_on_support_refpoints (SCM smob)
 159 {
 160   return general_side_position (unsmob_grob (smob), Y_AXIS, false, false, false, 0, 0, 0);
 161 }
 162
 163 MAKE_SCHEME_CALLBACK (Side_position_interface, pure_y_aligned_on_support_refpoints, 3);
 164 SCM
 165 Side_position_interface::pure_y_aligned_on_support_refpoints (SCM smob, SCM start, SCM end)
 166 {
 167   return general_side_position (unsmob_grob (smob), Y_AXIS, false, false,
 168                                 true, scm_to_int (start), scm_to_int (end), 0);
 169 }
 170
 171
 172 /*
 173   Position next to support, taking into account my own dimensions and padding.
 174 */
 175 SCM
 176 axis_aligned_side_helper (SCM smob, Axis a, bool pure, int start, int end, SCM current_off_scm)
 177 {
 178   Real r;
 179   Real *current_off_ptr = 0;
 180   if (scm_is_number (current_off_scm))
 181     {
 182       r = scm_to_double (current_off_scm);
 183       current_off_ptr = &r;
 184     }
 185
 186   return Side_position_interface::aligned_side (unsmob_grob (smob), a, pure, start, end, current_off_ptr);
 187 }
 188
 189
 190 MAKE_SCHEME_CALLBACK_WITH_OPTARGS (Side_position_interface, x_aligned_side, 2, 1, "");
 191 SCM
 192 Side_position_interface::x_aligned_side (SCM smob, SCM current_off)
 193 {
 194   return axis_aligned_side_helper (smob, X_AXIS, false, 0, 0, current_off);
 195 }
 196
 197 MAKE_SCHEME_CALLBACK_WITH_OPTARGS (Side_position_interface, y_aligned_side, 2, 1, "");
 198 SCM
 199 Side_position_interface::y_aligned_side (SCM smob, SCM current_off)
 200 {
 201   return axis_aligned_side_helper (smob, Y_AXIS, false, 0, 0, current_off);
 202 }
 203
 204 MAKE_SCHEME_CALLBACK_WITH_OPTARGS (Side_position_interface, pure_y_aligned_side, 4, 1, "");
 205 SCM
 206 Side_position_interface::pure_y_aligned_side (SCM smob, SCM start, SCM end, SCM cur_off)
 207 {
 208   return axis_aligned_side_helper (smob, Y_AXIS, true,
 209                                    scm_to_int (start),
 210                                    scm_to_int (end),
 211                                    cur_off);
 212 }
 213
 214 MAKE_SCHEME_CALLBACK (Side_position_interface, calc_cross_staff, 1)
 215 SCM
 216 Side_position_interface::calc_cross_staff (SCM smob)
 217 {
 218   Grob *me = unsmob_grob (smob);
 219   extract_grob_set (me, "side-support-elements", elts);
 220
 221   for (vsize i = 0; i < elts.size (); i++)
 222     if (to_boolean (elts[i]->get_property ("cross-staff")))
 223       return SCM_BOOL_T;
 224
 225   Grob *common = common_refpoint_of_array (elts, me->get_parent (Y_AXIS), Y_AXIS);
 226   return scm_from_bool (common != me->get_parent (Y_AXIS));
 227 }
 228
 229 SCM
 230 Side_position_interface::aligned_side (Grob *me, Axis a, bool pure, int start, int end,
 231                                        Real *current_off)
 232 {
 233   Direction dir = get_grob_direction (me);
 234
 235   Real o = scm_to_double (general_side_position (me, a, true, true, pure, start, end, current_off));
 236
 237   /*
 238     Maintain a minimum distance to the staff. This is similar to side
 239     position with padding, but it will put adjoining objects on a row if
 240     stuff sticks out of the staff a little.
 241   */
 242   Grob *staff = Staff_symbol_referencer::get_staff_symbol (me);
 243   if (staff && a == Y_AXIS)
 244     {
 245       if (to_boolean (me->get_property ("quantize-position")))
 246         {
 247           Grob *common = me->common_refpoint (staff, Y_AXIS);
 248           Real my_off = me->get_parent (Y_AXIS)->maybe_pure_coordinate (common, Y_AXIS, pure, start, end);
 249           Real staff_off = staff->maybe_pure_coordinate (common, Y_AXIS, pure, start, end);
 250           Real ss = Staff_symbol::staff_space (staff);
 251           Real position = 2 * (my_off + o - staff_off) / ss;
 252           Real rounded = directed_round (position, dir);
 253           Grob *head = me->get_parent (X_AXIS);
 254
 255           if (fabs (position) <= 2 * Staff_symbol_referencer::staff_radius (me) + 1
 256               /* In case of a ledger lines, quantize even if we're outside the staff. */
 257               || (Note_head::has_interface (head)
 258
 259                   && abs (Staff_symbol_referencer::get_position (head)) > abs (position)))
 260             {
 261               o += (rounded - position) * 0.5 * ss;
 262               if (Staff_symbol_referencer::on_line (me, int (rounded)))
 263                 o += dir * 0.5 * ss;
 264             }
 265         }
 266       else if (scm_is_number (me->get_property ("staff-padding")) && dir)
 267         {
 268           Interval iv = me->maybe_pure_extent (me, a, pure, start, end);
 269
 270           Real padding
 271             = Staff_symbol_referencer::staff_space (me)
 272             * scm_to_double (me->get_property ("staff-padding"));
 273
 274           Grob *common = me->common_refpoint (staff, Y_AXIS);
 275
 276           Interval staff_size = staff->maybe_pure_extent (common, Y_AXIS, pure, start, end);
 277           Real diff = dir*staff_size[dir] + padding - dir * (o + iv[-dir]);
 278           o += dir * max (diff, 0.0);
 279         }
 280     }
 281   return scm_from_double (o);
 282 }
 283
 284 void
 285 Side_position_interface::set_axis (Grob *me, Axis a)
 286 {
 287   if (!scm_is_number (me->get_property ("side-axis")))
 288     {
 289       me->set_property ("side-axis", scm_from_int (a));
 290       chain_offset_callback (me,
 291                              (a==X_AXIS)
 292                              ? x_aligned_side_proc
 293                              : y_aligned_side_proc,
 294                              a);
 295     }
 296 }
 297
 298 Axis
 299 Side_position_interface::get_axis (Grob *me)
 300 {
 301   if (scm_is_number (me->get_property ("side-axis")))
 302     return Axis (scm_to_int (me->get_property ("side-axis")));
 303
 304   string msg = String_convert::form_string ("side-axis not set for grob %s.",
 305                                             me->name ().c_str ());
 306   me->programming_error (msg);
 307   return NO_AXES;
 308 }
 309
 310 MAKE_SCHEME_CALLBACK (Side_position_interface, move_to_extremal_staff, 1);
 311 SCM
 312 Side_position_interface::move_to_extremal_staff (SCM smob)
 313 {
 314   Grob *me = unsmob_grob (smob);
 315   System *sys = dynamic_cast<System*> (me->get_system ());
 316   Direction dir = get_grob_direction (me);
 317   if (dir != DOWN)
 318     dir = UP;
 319
 320   Interval iv = me->extent (sys, X_AXIS);
 321   iv.widen (1.0);
 322   Grob *top_staff = sys->get_extremal_staff (dir, iv);
 323
 324   if (!top_staff)
 325     return SCM_BOOL_F;
 326
 327   // Only move this grob if it is a direct child of the system.  We
 328   // are not interested in moving marks from other staves to the top
 329   // staff; we only want to move marks from the system to the top
 330   // staff.
 331   if (sys != me->get_parent (Y_AXIS))
 332     return SCM_BOOL_F;
 333
 334   me->set_parent (top_staff, Y_AXIS);
 335   me->flush_extent_cache (Y_AXIS);
 336   Axis_group_interface::add_element (top_staff, me);
 337
 338   // Remove any cross-staff side-support dependencies
 339   Grob_array *ga = unsmob_grob_array (me->get_object ("side-support-elements"));
 340   if (ga)
 341     {
 342       vector<Grob*> const& elts = ga->array ();
 343       vector<Grob*> new_elts;
 344       for (vsize i = 0; i < elts.size (); ++i)
 345         {
 346           if (me->common_refpoint (elts[i], Y_AXIS) == top_staff)
 347             new_elts.push_back (elts[i]);
 348         }
 349       ga->set_array (new_elts);
 350     }
 351   return SCM_BOOL_T;
 352 }
 353
 354
 355 ADD_INTERFACE (Side_position_interface,
 356                "Position a victim object (this one) next to other objects"
 357                " (the support).  The property @code{direction} signifies where"
 358                " to put the victim object relative to the support (left or"
 359                " right, up or down?)\n"
 360                "\n"
 361                "The routine also takes the size of the staff into account if"
 362                " @code{staff-padding} is set.  If undefined, the staff symbol"
 363                " is ignored.",
 364
 365                /* properties */
 366                "direction "
 367                "minimum-space "
 368                "padding "
 369                "quantize-position "
 370                "side-axis "
 371                "side-support-elements "
 372                "slur-padding "
 373                "staff-padding "
 374                );