/*
This file is part of LilyPond, the GNU music typesetter.
- Copyright (C) 2004--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 2004--2012 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"
#include "warn.hh"
MAKE_SCHEME_CALLBACK (Self_alignment_interface, y_aligned_on_self, 1);
if (scm_is_number (align))
{
Interval ext (me->maybe_pure_extent (me, a, pure, start, end));
- 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 ())
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)
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);
}
"@end table\n",
/* properties */
+ "collision-bias "
+ "collision-padding "
+ "potential-X-colliding-grobs "
"self-alignment-X "
"self-alignment-Y "
+ "X-colliding-grobs "
+ "Y-colliding-grobs "
);