lily/line-spanner.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2011 Jan Nieuwenhuizen <janneke@gnu.org>
   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 "align-interface.hh"
  21 #include "axis-group-interface.hh"
  22 #include "font-interface.hh"
  23 #include "grob-interface.hh"
  24 #include "item.hh"
  25 #include "lily-proto.hh"
  26 #include "line-interface.hh"
  27 #include "output-def.hh"
  28 #include "pointer-group-interface.hh"
  29 #include "spanner.hh"
  30 #include "staff-symbol-referencer.hh"
  31 #include "system.hh"
  32 #include "text-interface.hh"
  33 #include "warn.hh"
  34
  35 class Line_spanner
  36 {
  37 public:
  38   DECLARE_SCHEME_CALLBACK (print, (SCM));
  39   DECLARE_SCHEME_CALLBACK (calc_left_bound_info, (SCM));
  40   DECLARE_SCHEME_CALLBACK (calc_left_bound_info_and_text, (SCM));
  41   DECLARE_SCHEME_CALLBACK (calc_right_bound_info, (SCM));
  42   DECLARE_SCHEME_CALLBACK (calc_bound_info, (SCM, Direction));
  43   DECLARE_GROB_INTERFACE ();
  44 };
  45
  46 Spanner *parent_spanner (Grob *g)
  47 {
  48   if (Spanner::has_interface (g))
  49     return dynamic_cast<Spanner *> (g);
  50   return parent_spanner (g->get_parent (Y_AXIS));
  51 }
  52
  53 SCM
  54 Line_spanner::calc_bound_info (SCM smob, Direction dir)
  55 {
  56   Spanner *me = unsmob_spanner (smob);
  57
  58   Grob *commonx = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT), X_AXIS);
  59   commonx = me->common_refpoint (commonx, X_AXIS);
  60
  61   SCM bound_details = me->get_property ("bound-details");
  62
  63   SCM details = SCM_BOOL_F;
  64   if (details == SCM_BOOL_F)
  65     details = ly_assoc_get ((dir == LEFT)
  66                             ? ly_symbol2scm ("left")
  67                             : ly_symbol2scm ("right"), bound_details, SCM_BOOL_F);
  68
  69   if (me->get_bound (dir)->break_status_dir ())
  70     {
  71       SCM extra = ly_assoc_get ((dir == LEFT)
  72                                 ? ly_symbol2scm ("left-broken")
  73                                 : ly_symbol2scm ("right-broken"), bound_details, SCM_EOL);
  74
  75       for (SCM s = scm_reverse (extra); scm_is_pair (s); s = scm_cdr (s))
  76         details = scm_cons (scm_car (s), details);
  77     }
  78
  79   if (details == SCM_BOOL_F)
  80     details = ly_assoc_get (ly_symbol2scm ("default"), bound_details, SCM_EOL);
  81
  82   SCM text = ly_assoc_get (ly_symbol2scm ("text"), details, SCM_BOOL_F);
  83   if (Text_interface::is_markup (text))
  84     {
  85       Output_def *layout = me->layout ();
  86       SCM properties = Font_interface::text_font_alist_chain (me);
  87       details = scm_acons (ly_symbol2scm ("stencil"),
  88                            Text_interface::interpret_markup (layout->self_scm (),
  89                                                              properties, text),
  90                            details);
  91     }
  92
  93   if (!scm_is_number (ly_assoc_get (ly_symbol2scm ("X"), details, SCM_BOOL_F)))
  94     {
  95       Direction attach = (Direction)
  96         robust_scm2int (ly_assoc_get (ly_symbol2scm ("attach-dir"),
  97                                                      details, SCM_BOOL_F),
  98                         CENTER);
  99
 100       Item *bound_item = me->get_bound (dir);
 101       Grob *bound_grob = bound_item;
 102       if (to_boolean (ly_assoc_get (ly_symbol2scm ("end-on-note"), details, SCM_BOOL_F))
 103           && bound_item->break_status_dir ())
 104         {
 105           extract_grob_set (me, "note-columns", columns);
 106           if (columns.size ())
 107             bound_grob = (dir == LEFT)
 108               ? columns[0] : columns.back();
 109         }
 110
 111       details = scm_acons (ly_symbol2scm ("X"),
 112                            scm_from_double (robust_relative_extent (bound_grob, commonx, X_AXIS)
 113                                             .linear_combination (attach)),
 114                            details);
 115     }
 116
 117
 118   if (!scm_is_number (ly_assoc_get (ly_symbol2scm ("Y"), details, SCM_BOOL_F)))
 119     {
 120       Real y = 0.0;
 121
 122       Real extra_dy = robust_scm2double (me->get_property ("extra-dy"),
 123                                          0.0);
 124
 125       Grob *common_y = me->common_refpoint (me->get_bound (dir), Y_AXIS);
 126       if (me->get_bound (dir)->break_status_dir ())
 127         {
 128           Spanner *next_sp = me->broken_neighbor (dir);
 129           Item *next_bound = next_sp->get_bound (dir);
 130
 131           if (next_bound->break_status_dir ())
 132             {
 133               programming_error ("no note heads for the line spanner on neighbor line?"
 134                                  " Confused.");
 135               me->suicide ();
 136               return SCM_EOL;
 137             }
 138
 139           Spanner *next_bound_parent = parent_spanner (next_bound);
 140           Interval next_ext = next_bound->extent (next_bound_parent, Y_AXIS);
 141
 142           /*
 143             We want to know what would be the y-position of the next
 144             bound (relative to my y-parent) if it belonged to the
 145             same system as this bound.  We rely on the fact that the
 146             y-parent of the next bound is a spanner (probably the
 147             VerticalAxisGroup of a staff) that extends over the break.
 148           */
 149           Spanner *next_bound_parent_on_this_line =
 150             next_bound_parent->broken_neighbor (other_dir (dir));
 151
 152           if (next_bound_parent_on_this_line)
 153             {
 154               Grob *common = me->common_refpoint (next_bound_parent_on_this_line, Y_AXIS);
 155               Real bound_offset = next_bound_parent_on_this_line->relative_coordinate (common, Y_AXIS);
 156               y = next_ext.center () + bound_offset - me->relative_coordinate (common, Y_AXIS);
 157             }
 158           else
 159             {
 160               /*
 161                 We fall back to assuming that the distance between
 162                 staves doesn't change over line breaks.
 163               */
 164               programming_error ("next-bound's parent doesn't extend to this line");
 165               Grob *next_system = next_bound->get_system ();
 166               Grob *this_system = me->get_system ();
 167               y = next_ext.center () + next_bound_parent->relative_coordinate (next_system, Y_AXIS)
 168                 - me->relative_coordinate (this_system, Y_AXIS);
 169             }
 170         }
 171       else
 172         {
 173           y = me->get_bound (dir)->extent (common_y, Y_AXIS).center ();
 174           details = scm_acons (ly_symbol2scm ("common-Y"), common_y->self_scm (), details);
 175         }
 176
 177       y += dir * extra_dy / 2;
 178       details = scm_acons (ly_symbol2scm ("Y"), scm_from_double (y), details);
 179     }
 180
 181   return details;
 182 }
 183
 184 MAKE_SCHEME_CALLBACK (Line_spanner, calc_right_bound_info, 1);
 185 SCM
 186 Line_spanner::calc_right_bound_info (SCM smob)
 187 {
 188   return Line_spanner::calc_bound_info (smob, RIGHT);
 189 }
 190
 191 MAKE_SCHEME_CALLBACK (Line_spanner, calc_left_bound_info, 1);
 192 SCM
 193 Line_spanner::calc_left_bound_info (SCM smob)
 194 {
 195   return Line_spanner::calc_bound_info (smob, LEFT);
 196 }
 197
 198 MAKE_SCHEME_CALLBACK (Line_spanner, calc_left_bound_info_and_text, 1);
 199 SCM
 200 Line_spanner::calc_left_bound_info_and_text (SCM smob)
 201 {
 202   SCM alist = Line_spanner::calc_bound_info (smob, LEFT);
 203   Spanner *me = unsmob_spanner (smob);
 204
 205   SCM text = me->get_property ("text");
 206   if (Text_interface::is_markup (text)
 207       && me->get_bound (LEFT)->break_status_dir () == CENTER
 208       && ly_assoc_get (ly_symbol2scm ("stencil"), alist, SCM_BOOL_F) == SCM_BOOL_F)
 209     {
 210       Output_def *layout = me->layout ();
 211       SCM properties = Font_interface::text_font_alist_chain (me);
 212       alist = scm_acons (ly_symbol2scm ("stencil"),
 213                          Text_interface::interpret_markup (layout->self_scm (),
 214                                                            properties, text),
 215                          alist);
 216     }
 217
 218   return alist;
 219 }
 220
 221 MAKE_SCHEME_CALLBACK (Line_spanner, print, 1);
 222 SCM
 223 Line_spanner::print (SCM smob)
 224 {
 225   Spanner *me = dynamic_cast<Spanner *> (unsmob_grob (smob));
 226
 227   Drul_array<SCM> bounds (me->get_property ("left-bound-info"),
 228                           me->get_property ("right-bound-info"));
 229
 230   Grob *commonx = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT), X_AXIS);
 231   commonx = me->common_refpoint (commonx, X_AXIS);
 232
 233   Drul_array<Offset> span_points;
 234
 235   Direction d =  LEFT;
 236   do
 237     {
 238       Offset z (robust_scm2double (ly_assoc_get (ly_symbol2scm ("X"),
 239                                                  bounds[d], SCM_BOOL_F), 0.0),
 240                 robust_scm2double (ly_assoc_get (ly_symbol2scm ("Y"),
 241                                                  bounds[d], SCM_BOOL_F), 0.0));
 242
 243       span_points[d] = z;
 244     }
 245   while (flip (&d) != LEFT);
 246
 247   Drul_array<Real> gaps (0, 0);
 248   Drul_array<bool> arrows (0, 0);
 249   Drul_array<Real> anchor_align (0, 0);
 250   Drul_array<Stencil *> stencils (0,0);
 251   Drul_array<Grob *> common_y (0, 0);
 252
 253   // For scaling of 'padding and 'stencil-offset
 254   Real magstep
 255     = pow (2, robust_scm2double (me->get_property ("font-size"), 0.0) / 6);
 256
 257   do
 258     {
 259       gaps[d] = robust_scm2double (ly_assoc_get (ly_symbol2scm ("padding"),
 260                                                  bounds[d], SCM_BOOL_F), 0.0);
 261       arrows[d] = to_boolean (ly_assoc_get (ly_symbol2scm ("arrow"),
 262                                             bounds[d], SCM_BOOL_F));
 263       anchor_align[d] = robust_scm2double (ly_assoc_get (ly_symbol2scm ("anchor-alignment"),
 264                                                          bounds[d], SCM_BOOL_F), LEFT);
 265       stencils[d] = unsmob_stencil (ly_assoc_get (ly_symbol2scm ("stencil"),
 266                                                   bounds[d], SCM_BOOL_F));
 267       common_y[d] = unsmob_grob (ly_assoc_get (ly_symbol2scm ("common-Y"),
 268                                                bounds[d], SCM_BOOL_F));
 269       if (!common_y[d])
 270         common_y[d] = me;
 271     }
 272   while (flip (&d) != LEFT);
 273
 274   Grob *my_common_y = common_y[LEFT]->common_refpoint (common_y[RIGHT], Y_AXIS);
 275   do
 276     span_points[d][Y_AXIS] += common_y[d]->relative_coordinate (my_common_y, Y_AXIS);
 277   while (flip (&d) != LEFT);
 278
 279   Offset dz = (span_points[RIGHT] - span_points[LEFT]);
 280   Offset dz_dir = dz.direction ();
 281   if (gaps[LEFT] + gaps[RIGHT] > dz.length ())
 282     {
 283       return SCM_EOL;
 284     }
 285
 286   Stencil line;
 287   do
 288     {
 289       span_points[d] += -d * gaps[d] * magstep * dz.direction ();
 290
 291       if (stencils[d])
 292         {
 293           Interval ext = stencils[d]->extent (X_AXIS);
 294           Real anchor = ext.linear_combination (anchor_align[d]) - ext[LEFT];
 295           span_points[d][X_AXIS] -= anchor;
 296
 297           Stencil s = stencils[d]->translated (span_points[d]);
 298           SCM align = ly_assoc_get (ly_symbol2scm ("stencil-align-dir-y"),
 299                                     bounds[d], SCM_BOOL_F);
 300           SCM off = ly_assoc_get (ly_symbol2scm ("stencil-offset"),
 301                                   bounds[d], SCM_BOOL_F);
 302
 303           if (scm_is_number (align))
 304             s.align_to (Y_AXIS, scm_to_double (align));
 305
 306           if (is_number_pair (off))
 307             s.translate (ly_scm2offset (off) * magstep);
 308
 309           line.add_stencil (s);
 310         }
 311     }
 312   while (flip (&d) != LEFT);
 313
 314   do
 315     {
 316       if (stencils[d])
 317         span_points[d] += dz_dir *
 318           (stencils[d]->extent (X_AXIS)[-d] / dz_dir[X_AXIS]);
 319     }
 320   while (flip (&d) != LEFT);
 321
 322   Offset adjust = dz.direction() * Staff_symbol_referencer::staff_space (me);
 323
 324   Offset line_left = span_points[LEFT] + (arrows[LEFT] ? adjust*1.4 : Offset (0, 0));
 325   Offset line_right = span_points[RIGHT] - (arrows[RIGHT] ? adjust*0.55 : Offset (0, 0));
 326   if (line_right[X_AXIS] > line_left[X_AXIS])
 327     {
 328       line.add_stencil (Line_interface::line (me, line_left, line_right));
 329
 330       line.add_stencil (Line_interface::arrows (me,
 331                                                 span_points[LEFT],
 332                                                 span_points[RIGHT],
 333                                                 arrows[LEFT],
 334                                                 arrows[RIGHT]));
 335     }
 336
 337   line.translate (Offset (-me->relative_coordinate (commonx, X_AXIS),
 338                           -me->relative_coordinate (my_common_y, Y_AXIS)));
 339
 340
 341   return line.smobbed_copy ();
 342 }
 343
 344 ADD_INTERFACE (Line_spanner,
 345                "Generic line drawn between two objects, e.g., for use with"
 346                " glissandi.",
 347
 348                /* properties */
 349                "bound-details "
 350                "extra-dy "
 351                "gap "
 352                "left-bound-info "
 353                "note-columns "
 354                "right-bound-info "
 355                "thickness "
 356                "to-barline "
 357                );