2 separation-item.cc -- implement Separation_item
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "separation-item.hh"
11 #include "axis-group-interface.hh"
13 #include "note-head.hh"
16 #include "paper-column.hh"
18 #include "pointer-group-interface.hh"
19 #include "accidental-placement.hh"
22 Separation_item::add_item (Grob *s, Item *i)
25 Pointer_group_interface::add_grob (s, ly_symbol2scm ("elements"), i);
29 Separation_item::add_conditional_item (Grob *me, Grob *e)
31 Pointer_group_interface::add_grob (me, ly_symbol2scm ("conditional-elements"), e);
35 Separation_item::set_distance (Item *l, Item *r, Real padding)
37 Drul_array<Skyline_pair*> lines (Skyline_pair::unsmob (l->get_property ("horizontal-skylines")),
38 Skyline_pair::unsmob (r->get_property ("horizontal-skylines")));
39 Skyline right = conditional_skyline (r, l);
40 right.merge ((*lines[RIGHT])[LEFT]);
42 Real dist = padding + (*lines[LEFT])[RIGHT].distance (right);
47 rod.item_drul_ = Drul_array<Item*> (l, r);
53 return max (dist, 0.0);
57 Separation_item::is_empty (Grob *me)
59 Skyline_pair *sky = Skyline_pair::unsmob (me->get_property ("horizontal-skylines"));
60 return (!sky || sky->is_empty ());
64 Return the width of ME given that we are considering the object on
68 Separation_item::conditional_skyline (Grob *me, Grob *left)
70 vector<Box> bs = boxes (me, left);
71 return Skyline (bs, 0.1, Y_AXIS, LEFT);
75 MAKE_SCHEME_CALLBACK (Separation_item, calc_skylines,1);
77 Separation_item::calc_skylines (SCM smob)
79 Item *me = unsmob_item (smob);
80 vector<Box> bs = boxes (me, 0);
81 /* todo: the horizon_padding is somewhat arbitrary */
82 return Skyline_pair (bs, 0.1, Y_AXIS).smobbed_copy ();
85 /* if left is non-NULL, get the boxes corresponding to the
86 conditional-elements (conditioned on the grob LEFT). This
87 sounds more general than it is: conditional-elements are
88 always accidentals attached to a tied note.
91 Separation_item::boxes (Grob *me, Grob *left)
93 Item *item = dynamic_cast<Item *> (me);
95 int very_large = INT_MAX;
96 Paper_column *pc = item->get_column ();
98 extract_grob_set (me, left ? "conditional-elements" : "elements", read_only_elts);
102 elts = Accidental_placement::get_relevant_accidentals (read_only_elts, left);
104 elts = read_only_elts;
106 Grob *ycommon = common_refpoint_of_array (elts, me, Y_AXIS);
108 for (vsize i = 0; i < elts.size (); i++)
110 Item *il = dynamic_cast<Item *> (elts[i]);
111 if (pc != il->get_column ())
114 /* ugh. We want to exclude groups of grobs (so that we insert each grob
115 individually into the skyline instead of adding a single box that
116 bounds all of them). However, we can't exclude an axis-group that
117 adds to its childrens' stencil. Currently, this is just TrillPitchGroup;
118 hence the check for note-head-interface. */
119 if (Axis_group_interface::has_interface (il)
120 && !Note_head::has_interface (il))
123 Interval y (il->pure_height (ycommon, 0, very_large));
124 Interval x (il->extent (pc, X_AXIS));
126 Interval extra = robust_scm2interval (elts[i]->get_property ("extra-spacing-width"),
127 Interval (-0.1, 0.1));
128 x[LEFT] += extra[LEFT];
129 x[RIGHT] += extra[RIGHT];
130 if (to_boolean (elts[i]->get_property ("infinite-spacing-height")))
131 y = Interval (-infinity_f, infinity_f);
133 if (!x.is_empty () && !y.is_empty ())
134 out.push_back (Box (x, y));
140 extern bool debug_skylines;
141 MAKE_SCHEME_CALLBACK (Separation_item, print, 1)
143 Separation_item::print (SCM smob)
148 Grob *me = unsmob_grob (smob);
150 if (Skyline_pair *s = Skyline_pair::unsmob (me->get_property ("horizontal-skylines")))
152 ret.add_stencil (Lookup::points_to_line_stencil (0.1, (*s)[LEFT].to_points (Y_AXIS)).in_color (255, 255, 0));
153 ret.add_stencil (Lookup::points_to_line_stencil (0.1, (*s)[RIGHT].to_points (Y_AXIS)).in_color (0, 255, 255));
155 return ret.smobbed_copy ();
158 ADD_INTERFACE (Separation_item,
159 "Item that computes widths to generate spacing rods. "
163 "conditional-elements "
166 "horizontal-skylines "