/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 2004--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 2004--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
LilyPond is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include "self-alignment-interface.hh"
-#include "directional-element-interface.hh"
#include "grob.hh"
-#include "grob-array.hh"
-#include "interval-minefield.hh"
#include "note-column.hh"
#include "paper-column.hh"
#include "pointer-group-interface.hh"
if (scm_is_number (align))
{
Interval ext (me->maybe_pure_extent (me, a, pure, start, end));
+ // Empty extent doesn't mean an error - we simply don't align such grobs.
+ // However, empty extent and non-empty stencil would be suspicious.
if (!ext.is_empty ())
return scm_from_double (- ext.linear_combination (scm_to_double (align)));
+ else if (me->get_stencil ())
+ warning (me->name () + " has empty extent and non-empty stencil.");
}
return scm_from_double (0.0);
}
return centered_on_object (unsmob_grob (smob)->get_parent (X_AXIS), X_AXIS);
}
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_note_columns, 1);
-SCM
-Self_alignment_interface::centered_on_note_columns (SCM smob)
-{
- Item *it = unsmob_item (smob)->get_column ();
- if (!it)
- return scm_from_double (0.0);
-
- extract_grob_set (it, "elements", elts);
- vector<Grob *> ncs;
- Interval centers;
- for (vsize i = 0; i < elts.size (); i++)
- if (Note_column::has_interface (elts[i]))
- centers.add_point (scm_to_double (centered_on_object (elts[i], X_AXIS)));
-
- if (centers.is_empty ())
- return scm_from_double (0.0);
-
- return scm_from_double (centers.center ());
-}
-
MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_y_parent, 1);
SCM
Self_alignment_interface::centered_on_y_parent (SCM smob)
return centered_on_object (unsmob_grob (smob)->get_parent (Y_AXIS), Y_AXIS);
}
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, x_centered_on_y_parent, 1);
-SCM
-Self_alignment_interface::x_centered_on_y_parent (SCM smob)
-{
- return centered_on_object (unsmob_grob (smob)->get_parent (Y_AXIS), X_AXIS);
-}
-
MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_x_parent, 1);
SCM
Self_alignment_interface::aligned_on_x_parent (SCM smob)
Self_alignment_interface::aligned_on_parent (Grob *me, Axis a)
{
Grob *him = me->get_parent (a);
+ Interval he;
if (Paper_column::has_interface (him))
- return scm_from_double (0.0);
-
- Interval he = him->extent (him, a);
+ /*
+ PaperColumn extents aren't reliable (they depend on size and alignment
+ of PaperColumn's children), so we align on NoteColumn instead.
+ This happens e.g. for lyrics without associatedVoice.
+ */
+ he = Paper_column::get_interface_extent
+ (him, ly_symbol2scm ("note-column-interface"), a);
+ else
+ he = him->extent (him, a);
SCM sym = (a == X_AXIS) ? ly_symbol2scm ("self-alignment-X")
: ly_symbol2scm ("self-alignment-Y");
Real align = scm_to_double (align_prop);
Interval ext (me->extent (me, a));
- if (ext.is_empty ())
- programming_error ("cannot align on self: empty element");
- else
+
+ // Empty extent doesn't mean an error - we simply don't align such grobs.
+ // However, empty extent and non-empty stencil would be suspicious.
+ if (!ext.is_empty ())
x -= ext.linear_combination (align);
+ else if (me->get_stencil ())
+ warning (me->name () + " has empty extent and non-empty stencil.");
+ // See comment above.
if (!he.is_empty ())
x += he.linear_combination (align);
+ else if (him->get_stencil ())
+ warning (him->name () + " has empty extent and non-empty stencil.");
return scm_from_double (x);
}
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, avoid_x_colliding_grobs, 2);
-SCM
-Self_alignment_interface::avoid_x_colliding_grobs (SCM smob, SCM o)
-{
- SCM avoided = avoid_colliding_grobs (unsmob_grob (smob), X_AXIS, robust_scm2double (o, 0.0));
- return scm_is_null (avoided) ? o : avoided;
-}
-
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, x_colliding_grobs, 1);
-SCM
-Self_alignment_interface::x_colliding_grobs (SCM smob)
-{
- Grob *me = unsmob_grob (smob);
- extract_grob_set (me, "potential-X-colliding-grobs", pot);
- vector<Grob *> act;
- Direction d = get_grob_direction (me->get_parent (Y_AXIS));
- for (vsize i = 0; i < pot.size (); i++)
- if (d == get_grob_direction (pot[i])
- && to_boolean (pot[i]->get_property ("cross-staff")))
- act.push_back (pot[i]);
-
- SCM grobs_scm = Grob_array::make_array ();
- unsmob_grob_array (grobs_scm)->set_array (act);
-
- return grobs_scm;
-}
-
-SCM
-Self_alignment_interface::avoid_colliding_grobs (Grob *me, Axis a, Real offset)
-{
- extract_grob_set (me, a == X_AXIS ? "X-colliding-grobs" : "Y-colliding-grobs", colls);
- if (!colls.size ())
- return SCM_EOL;
- vector<Interval> ivs;
-
- Item *refp = dynamic_cast<Item *> (common_refpoint_of_array (colls, me, a));
- if (!refp)
- return SCM_EOL;
-
- Interval iv = me->extent (me, a) + offset;
- for (vsize i = 0; i < colls.size (); i++)
- ivs.push_back (colls[i]->extent (refp, a));
-
- Interval_minefield minefield (Interval (iv.center (), iv.center ()), iv.length ());
- for (vsize i = 0; i < ivs.size (); i++)
- minefield.add_forbidden_interval (ivs[i]);
- minefield.solve ();
- Interval pos = minefield.feasible_placements ();
-
- if (pos[LEFT] == pos[RIGHT])
- return SCM_EOL;
-
- Direction col_dir = ((abs (pos[LEFT] - iv.center ())
- + robust_scm2double (me->get_property ("collision-bias"), 0.0))
- > abs (pos[RIGHT] - iv.center ()))
- ? RIGHT
- : LEFT;
-
- return scm_from_double ((pos[col_dir] - (iv.length () / 2)
- + col_dir
- * robust_scm2double (me->get_property ("collision-padding"), 0.0)));
-}
-
void
Self_alignment_interface::set_center_parent (Grob *me, Axis a)
{
a);
}
-void
-Self_alignment_interface::avoid_x_collisions (Grob *me)
-{
- chain_offset_callback (me, avoid_x_colliding_grobs_proc, X_AXIS);
-}
-
void
Self_alignment_interface::set_align_self (Grob *me, Axis a)
{
"@end table\n",
/* properties */
- "collision-bias "
- "collision-padding "
- "potential-X-colliding-grobs "
"self-alignment-X "
"self-alignment-Y "
- "X-colliding-grobs "
- "Y-colliding-grobs "
);