+++ /dev/null
-/*
- self-alignment-interface.cc -- implement Self_alignment_interface
-
- source file of the GNU LilyPond music typesetter
-
- (c) 2004--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
-*/
-
-#include "self-alignment-interface.hh"
-
-#include "warn.hh"
-#include "paper-column.hh"
-#include "grob.hh"
-
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, y_aligned_on_self, 1);
-SCM
-Self_alignment_interface::y_aligned_on_self (SCM element)
-{
- return aligned_on_self (unsmob_grob (element), Y_AXIS);
-}
-
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, x_aligned_on_self, 1);
-SCM
-Self_alignment_interface::x_aligned_on_self (SCM element)
-{
- return aligned_on_self (unsmob_grob (element), X_AXIS);
-}
-
-SCM
-Self_alignment_interface::aligned_on_self (Grob *me, Axis a)
-{
- SCM sym = (a == X_AXIS) ? ly_symbol2scm ("self-alignment-X")
- : ly_symbol2scm ("self-alignment-Y");
-
- SCM align (me->internal_get_property (sym));
- if (scm_is_number (align))
- {
- Interval ext (me->extent (me, a));
- if (ext.is_empty ())
- programming_error ("cannot align on self: empty element");
- else
- return scm_from_double (- ext.linear_combination (scm_to_double (align)));
- }
- return scm_from_double (0.0);
-}
-
-
-
-SCM
-Self_alignment_interface::centered_on_object (Grob *him, Axis a)
-{
- return scm_from_double (robust_relative_extent (him, him, a).center ());
-}
-
-
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_x_parent, 1);
-SCM
-Self_alignment_interface::centered_on_x_parent (SCM smob)
-{
- return centered_on_object (unsmob_grob (smob)->get_parent (X_AXIS), X_AXIS);
-}
-
-
-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)
-{
- return aligned_on_parent (unsmob_grob (smob), X_AXIS);
-}
-
-MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_y_parent,1);
-SCM
-Self_alignment_interface::aligned_on_y_parent (SCM smob)
-{
- return aligned_on_parent (unsmob_grob (smob), Y_AXIS);
-}
-
-SCM
-Self_alignment_interface::aligned_on_parent (Grob *me, Axis a)
-{
- Grob *him = me->get_parent (a);
- if (Paper_column::has_interface (him))
- return scm_from_double (0.0);
-
- Interval he = him->extent (him, a);
-
- SCM sym = (a == X_AXIS) ? ly_symbol2scm ("self-alignment-X")
- : ly_symbol2scm ("self-alignment-Y");
- SCM align_prop (me->internal_get_property (sym));
-
- if (!scm_is_number (align_prop))
- return scm_from_int (0);
-
- Real x = 0.0;
- 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
- x -= ext.linear_combination (align);
-
- if (!he.is_empty ())
- x += he.linear_combination (align);
-
- return scm_from_double (x);
-}
-
-void
-Self_alignment_interface::set_center_parent (Grob *me, Axis a)
-{
- add_offset_callback (me,
- (a==X_AXIS) ? centered_on_x_parent_proc : centered_on_y_parent_proc,
- a);
-}
-
-void
-Self_alignment_interface::set_align_self (Grob *me, Axis a)
-{
- add_offset_callback (me,
- (a==X_AXIS) ? x_aligned_on_self_proc : y_aligned_on_self_proc,
- a);
-}
-
-ADD_INTERFACE (Self_alignment_interface,
- "Position this object on itself and/or on its parent. To this"
- " end, the following functions are provided:\n"
- "\n"
- "@table @code\n"
- "@item Self_alignment_interface::[xy]_aligned_on_self\n"
- "Align self on reference point, using"
- " @code{self-alignment-X} and @code{self-alignment-Y}."
- "@item Self_alignment_interface::aligned_on_[xy]_parent\n"
- "@item Self_alignment_interface::centered_on_[xy]_parent\n"
- "Shift the object so its own reference point is centered on"
- " the extent of the parent\n"
- "@end table\n",
-
- /* properties */
- "self-alignment-X "
- "self-alignment-Y "
- );
-