lily/separation-item.cc

   1 /*
   2   separation-item.cc -- implement Separation_item
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7 */
   8
   9 #include "separation-item.hh"
  10
  11 #include "accidental-placement.hh"
  12 #include "axis-group-interface.hh"
  13 #include "lookup.hh"
  14 #include "note-column.hh"
  15 #include "note-head.hh"
  16 #include "paper-column.hh"
  17 #include "pointer-group-interface.hh"
  18 #include "skyline-pair.hh"
  19 #include "stencil.hh"
  20 #include "warn.hh"
  21
  22 void
  23 Separation_item::add_item (Grob *s, Item *i)
  24 {
  25   assert (i);
  26   Pointer_group_interface::add_grob (s, ly_symbol2scm ("elements"), i);
  27 }
  28
  29 void
  30 Separation_item::add_conditional_item (Grob *me, Grob *e)
  31 {
  32   Pointer_group_interface::add_grob (me, ly_symbol2scm ("conditional-elements"), e);
  33 }
  34
  35 Real
  36 Separation_item::set_distance (Item *l, Item *r, Real padding)
  37 {
  38   Drul_array<Skyline_pair*> lines (Skyline_pair::unsmob (l->get_property ("horizontal-skylines")),
  39                                    Skyline_pair::unsmob (r->get_property ("horizontal-skylines")));
  40   Skyline right = conditional_skyline (r, l);
  41   right.merge ((*lines[RIGHT])[LEFT]);
  42
  43   Real dist = padding + (*lines[LEFT])[RIGHT].distance (right);
  44   if (dist > 0)
  45     {
  46       Rod rod;
  47
  48       rod.item_drul_ = Drul_array<Item*> (l, r);
  49
  50       rod.distance_ = dist;
  51       rod.add_to_cols ();
  52     }
  53
  54   return max (dist, 0.0);
  55 }
  56
  57 bool
  58 Separation_item::is_empty (Grob *me)
  59 {
  60   Skyline_pair *sky = Skyline_pair::unsmob (me->get_property ("horizontal-skylines"));
  61   return (!sky || sky->is_empty ());
  62 }
  63
  64 /*
  65   Return the width of ME given that we are considering the object on
  66   the LEFT.
  67 */
  68 Skyline
  69 Separation_item::conditional_skyline (Grob *me, Grob *left)
  70 {
  71   vector<Box> bs = boxes (me, left);
  72   return Skyline (bs, 0.1, Y_AXIS, LEFT);
  73 }
  74
  75
  76 MAKE_SCHEME_CALLBACK (Separation_item, calc_skylines,1);
  77 SCM
  78 Separation_item::calc_skylines (SCM smob)
  79 {
  80   Item *me = unsmob_item (smob);
  81   vector<Box> bs = boxes (me, 0);
  82   /* todo: the horizon_padding is somewhat arbitrary */
  83   return Skyline_pair (bs, 0.1, Y_AXIS).smobbed_copy ();
  84 }
  85
  86 /* if left is non-NULL, get the boxes corresponding to the
  87    conditional-elements (conditioned on the grob LEFT). This
  88    sounds more general than it is: conditional-elements are
  89    always accidentals attached to a tied note.
  90 */
  91 vector<Box>
  92 Separation_item::boxes (Grob *me, Grob *left)
  93 {
  94   Item *item = dynamic_cast<Item *> (me);
  95
  96   int very_large = INT_MAX;
  97   Paper_column *pc = item->get_column ();
  98   vector<Box> out;
  99   extract_grob_set (me, left ? "conditional-elements" : "elements", read_only_elts);
 100   vector<Grob*> elts;
 101
 102   if (left)
 103     elts = Accidental_placement::get_relevant_accidentals (read_only_elts, left);
 104   else
 105     {
 106       elts = read_only_elts;
 107
 108       /* This is a special-case for NoteColumn: we want to include arpeggio in its
 109          skyline (so spacing takes it into account) but we don't want to include it
 110          in the NoteColumn's extent because some spanners (eg. Hairpin) bound themselves
 111          on the NoteColumn and we don't want them to include arpeggios in their bounds.
 112       */
 113       if (Grob *a = Note_column::arpeggio (me)) {
 114         elts.push_back (a);
 115       }
 116     }
 117
 118   Grob *ycommon = common_refpoint_of_array (elts, me, Y_AXIS);
 119
 120   for (vsize i = 0; i < elts.size (); i++)
 121     {
 122       Item *il = dynamic_cast<Item *> (elts[i]);
 123       if (pc != il->get_column ())
 124         continue;
 125
 126       /* ugh. We want to exclude groups of grobs (so that we insert each grob
 127          individually into the skyline instead of adding a single box that
 128          bounds all of them). However, we can't exclude an axis-group that
 129          adds to its childrens' stencil. Currently, this is just TrillPitchGroup;
 130          hence the check for note-head-interface. */
 131       if (Axis_group_interface::has_interface (il)
 132           && !Note_head::has_interface (il))
 133         continue;
 134
 135       Interval y (il->pure_height (ycommon, 0, very_large));
 136       Interval x (il->extent (pc, X_AXIS));
 137
 138       Interval extra_width = robust_scm2interval (elts[i]->get_property ("extra-spacing-width"),
 139                                                   Interval (-0.1, 0.1));
 140       Interval extra_height = robust_scm2interval (elts[i]->get_property ("extra-spacing-height"),
 141                                                    Interval (-0.1, 0.1));
 142
 143       x[LEFT] += extra_width[LEFT];
 144       x[RIGHT] += extra_width[RIGHT];
 145       y[DOWN] += extra_height[DOWN];
 146       y[UP] += extra_height[UP];
 147
 148       if (!x.is_empty () && !y.is_empty ())
 149         out.push_back (Box (x, y));
 150     }
 151
 152   return out;
 153 }
 154
 155 MAKE_SCHEME_CALLBACK (Separation_item, print, 1)
 156 SCM
 157 Separation_item::print (SCM smob)
 158 {
 159   if (!debug_skylines)
 160     return SCM_BOOL_F;
 161
 162   Grob *me = unsmob_grob (smob);
 163   Stencil ret;
 164   if (Skyline_pair *s = Skyline_pair::unsmob (me->get_property ("horizontal-skylines")))
 165     {
 166       ret.add_stencil (Lookup::points_to_line_stencil (0.1, (*s)[LEFT].to_points (Y_AXIS)).in_color (255, 255, 0));
 167       ret.add_stencil (Lookup::points_to_line_stencil (0.1, (*s)[RIGHT].to_points (Y_AXIS)).in_color (0, 255, 255));
 168     }
 169   return ret.smobbed_copy ();
 170 }
 171
 172 ADD_INTERFACE (Separation_item,
 173                "Item that computes widths to generate spacing rods.",
 174
 175                /* properties */
 176                "X-extent "
 177                "conditional-elements "
 178                "elements "
 179                "padding "
 180                "horizontal-skylines "
 181                );