lily/dot-column.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--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 "dot-column.hh"
  21
  22 #include <cstdio>
  23 #include <cmath>
  24 #include <map>
  25 #include <set>
  26
  27 using namespace std;
  28
  29 #include "axis-group-interface.hh"
  30 #include "directional-element-interface.hh"
  31 #include "dot-column.hh"
  32 #include "dot-configuration.hh"
  33 #include "dot-formatting-problem.hh"
  34 #include "dots.hh"
  35 #include "grob.hh"
  36 #include "note-head.hh"
  37 #include "pointer-group-interface.hh"
  38 #include "rest.hh"
  39 #include "rhythmic-head.hh"
  40 #include "side-position-interface.hh"
  41 #include "staff-symbol-referencer.hh"
  42 #include "stem.hh"
  43
  44 MAKE_SCHEME_CALLBACK (Dot_column, calc_positioning_done, 1);
  45 SCM
  46 Dot_column::calc_positioning_done (SCM smob)
  47 {
  48   Grob *me = unsmob_grob (smob);
  49
  50   /*
  51     Trigger note collision resolution first, since that may kill off
  52     dots when merging.
  53   */
  54   if (Grob *collision = unsmob_grob (me->get_object ("note-collision")))
  55     (void) collision->get_property ("positioning-done");
  56
  57   me->set_property ("positioning-done", SCM_BOOL_T);
  58
  59   vector<Grob*> dots
  60     = extract_grob_array (me, "dots");
  61
  62   vector<Grob*> main_heads;
  63   Real ss = 0;
  64
  65   Grob *commonx = me;
  66   for (vsize i = 0; i < dots.size (); i++)
  67     {
  68       Grob *n = dots[i]->get_parent (Y_AXIS);
  69       commonx = n->common_refpoint (commonx, X_AXIS);
  70
  71       if (Grob *stem = unsmob_grob (n->get_object("stem")))
  72         {
  73           commonx = stem->common_refpoint (commonx, X_AXIS);
  74
  75           if (Stem::first_head (stem) == n)
  76             main_heads.push_back (n);
  77         }
  78     }
  79
  80   vector<Box> boxes;
  81   set<Grob*> stems;
  82
  83   extract_grob_set(me, "side-support-elements", support);
  84
  85   Interval base_x;
  86   for (vsize i = 0; i < main_heads.size (); i++)
  87     base_x.unite (main_heads[i]->extent (commonx, X_AXIS));
  88
  89   for (vsize i = 0; i < support.size (); i++)
  90     {
  91       Grob *s = support[i];
  92       if (!ss)
  93         ss = Staff_symbol_referencer::staff_space (s);
  94
  95       /* can't inspect Y extent of rest.
  96
  97          Rest collisions should wait after line breaking.
  98       */
  99       Interval y;
 100       if (Rest::has_interface (s))
 101         {
 102           base_x.unite (s->extent (commonx, X_AXIS));
 103           continue;
 104         }
 105       else if (Stem::has_interface (s))
 106         {
 107           Real y1 = Stem::head_positions (s)[-get_grob_direction (s)];
 108           Real y2 = y1 + get_grob_direction (s) * 7;
 109
 110           y.add_point (y1);
 111           y.add_point (y2);
 112         }
 113       else if (Note_head::has_interface (s))
 114         y = Interval (-1, 1);
 115       else
 116         {
 117           programming_error ("unknown grob in dot col support");
 118           continue;
 119         }
 120
 121       y *= 2 / ss;
 122       y += Staff_symbol_referencer::get_position (s);
 123
 124       Box b (s->extent (commonx, X_AXIS), y);
 125       boxes.push_back (b);
 126
 127       if (Grob *stem = unsmob_grob (s->get_object ("stem")))
 128         stems.insert (stem);
 129     }
 130
 131   for (set<Grob*>::const_iterator i (stems.begin());
 132        i != stems.end (); i++)
 133     {
 134       Grob *stem = (*i);
 135       Stencil flag = Stem::flag (stem);
 136       if (!flag.is_empty ())
 137         {
 138           Interval y = flag.extent (Y_AXIS)
 139             * (2 / ss)
 140             + Stem::stem_end_position (stem);
 141
 142           Interval x = stem->relative_coordinate (commonx, X_AXIS)
 143             + flag.extent (X_AXIS);
 144
 145           boxes.push_back (Box (x,y));
 146         }
 147     }
 148
 149   vector_sort (dots, position_less);
 150   for (vsize i = dots.size (); i--;)
 151     {
 152       if (!dots[i]->is_live ())
 153         dots.erase (dots.begin () + i);
 154       else
 155         // Undo any fake translations that were done in add_head.
 156         dots[i]->translate_axis (-dots[i]->relative_coordinate (me, X_AXIS), X_AXIS);
 157     }
 158
 159   Dot_formatting_problem problem (boxes, base_x);
 160
 161   Dot_configuration cfg (problem);
 162   for (vsize i = 0; i < dots.size (); i++)
 163     {
 164       Dot_position dp;
 165       dp.dot_ = dots[i];
 166
 167       Grob *note = dots[i]->get_parent (Y_AXIS);
 168       if (note)
 169         {
 170           Grob *stem = unsmob_grob (note->get_object ("stem"));
 171           if (stem)
 172             dp.extremal_head_ = Stem::first_head (stem) == note;
 173
 174           dp.x_extent_ = note->extent (commonx, X_AXIS);
 175         }
 176
 177       int p = Staff_symbol_referencer::get_rounded_position (dp.dot_);
 178
 179       /* icky, since this should go via a Staff_symbol_referencer
 180          offset callback but adding a dot overwrites Y-offset. */
 181       p += (int) robust_scm2double (dp.dot_->get_property ("staff-position"), 0.0);
 182       dp.pos_ = p;
 183       if (dp.extremal_head_)
 184         dp.dir_ = to_dir (dp.dot_->get_property ("direction"));
 185
 186       cfg.remove_collision (p);
 187       cfg[p] = dp;
 188       if (Staff_symbol_referencer::on_line (dp.dot_, p))
 189         cfg.remove_collision (p);
 190     }
 191
 192   problem.register_configuration (cfg);
 193
 194   for (Dot_configuration::const_iterator i (cfg.begin ());
 195        i != cfg.end (); i++)
 196     {
 197       /*
 198         Junkme?
 199        */
 200       Staff_symbol_referencer::set_position (i->second.dot_, i->first);
 201     }
 202
 203   me->translate_axis (cfg.x_offset () - me->relative_coordinate (commonx, X_AXIS),
 204                       X_AXIS);
 205   return SCM_BOOL_T;
 206 }
 207
 208 void
 209 Dot_column::add_head (Grob *me, Grob *head)
 210 {
 211   Grob *d = unsmob_grob (head->get_object ("dot"));
 212   if (d)
 213     {
 214       Side_position_interface::add_support (me, head);
 215
 216       Pointer_group_interface::add_grob (me, ly_symbol2scm ("dots"), d);
 217       d->set_property ("Y-offset", Grob::x_parent_positioning_proc);
 218       // Dot formatting requests the Y-offset, which for rests may
 219       // trigger post-linebreak callbacks.  On the other hand, we need the
 220       // correct X-offset of the dots for horizontal collision avoidance.
 221       // The translation here is undone in calc_positioning_done, where we
 222       // do the X-offset properly.
 223       if (Rest::has_interface (head))
 224         d->translate_axis (head->extent (head, X_AXIS).length (), X_AXIS);
 225       else
 226         d->set_property ("X-offset", Grob::x_parent_positioning_proc);
 227       Axis_group_interface::add_element (me, d);
 228     }
 229 }
 230
 231 ADD_INTERFACE (Dot_column,
 232                "Group dot objects so they form a column, and position"
 233                " dots so they do not clash with staff lines.",
 234
 235                /* properties */
 236                "dots "
 237                "positioning-done "
 238                "direction "
 239                );
 240