2 This file is part of LilyPond, the GNU music typesetter.
4 Copyright (C) 2004--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
6 LilyPond is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 LilyPond is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
20 #include "self-alignment-interface.hh"
23 #include "note-column.hh"
24 #include "paper-column.hh"
25 #include "pointer-group-interface.hh"
29 MAKE_SCHEME_CALLBACK (Self_alignment_interface, y_aligned_on_self, 1);
31 Self_alignment_interface::y_aligned_on_self (SCM element)
33 return aligned_on_self (unsmob<Grob> (element), Y_AXIS, false, 0, 0);
36 MAKE_SCHEME_CALLBACK (Self_alignment_interface, x_aligned_on_self, 1);
38 Self_alignment_interface::x_aligned_on_self (SCM element)
40 return aligned_on_self (unsmob<Grob> (element), X_AXIS, false, 0, 0);
43 MAKE_SCHEME_CALLBACK (Self_alignment_interface, pure_y_aligned_on_self, 3);
45 Self_alignment_interface::pure_y_aligned_on_self (SCM smob, SCM start, SCM end)
47 return aligned_on_self (unsmob<Grob> (smob), Y_AXIS, true, robust_scm2int (start, 0), robust_scm2int (end, INT_MAX));
51 Self_alignment_interface::aligned_on_self (Grob *me, Axis a, bool pure, int start, int end)
53 SCM align = (a == X_AXIS)
54 ? me->get_property ("self-alignment-X")
55 : me->get_property ("self-alignment-Y");
56 if (scm_is_number (align))
58 Interval ext (me->maybe_pure_extent (me, a, pure, start, end));
59 // Empty extent doesn't mean an error - we simply don't align such grobs.
60 // However, empty extent and non-empty stencil would be suspicious.
62 return scm_from_double (- ext.linear_combination (scm_to_double (align)));
65 Stencil *st = me->get_stencil ();
66 if (st && !st->is_empty ())
67 warning (me->name () + " has empty extent and non-empty stencil.");
70 return scm_from_double (0.0);
74 Self_alignment_interface::centered_on_object (Grob *him, Axis a)
76 return scm_from_double (robust_relative_extent (him, him, a).center ());
79 MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_x_parent, 1);
81 Self_alignment_interface::centered_on_x_parent (SCM smob)
83 return centered_on_object (unsmob<Grob> (smob)->get_parent (X_AXIS), X_AXIS);
86 MAKE_SCHEME_CALLBACK (Self_alignment_interface, centered_on_y_parent, 1);
88 Self_alignment_interface::centered_on_y_parent (SCM smob)
90 return centered_on_object (unsmob<Grob> (smob)->get_parent (Y_AXIS), Y_AXIS);
93 MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_x_parent, 1);
95 Self_alignment_interface::aligned_on_x_parent (SCM smob)
97 return aligned_on_parent (unsmob<Grob> (smob), X_AXIS);
100 MAKE_SCHEME_CALLBACK (Self_alignment_interface, aligned_on_y_parent, 1);
102 Self_alignment_interface::aligned_on_y_parent (SCM smob)
104 return aligned_on_parent (unsmob<Grob> (smob), Y_AXIS);
108 Self_alignment_interface::aligned_on_parent (Grob *me, Axis a)
110 Grob *him = me->get_parent (a);
112 if (has_interface<Paper_column> (him))
114 PaperColumn extents aren't reliable (they depend on size and alignment
115 of PaperColumn's children), so we align on NoteColumn instead.
116 This happens e.g. for lyrics without associatedVoice.
118 he = Paper_column::get_interface_extent
119 (him, ly_symbol2scm ("note-column-interface"), a);
122 if (to_boolean (me->get_property ("X-align-on-main-noteheads"))
123 && has_interface<Note_column> (him))
124 he = Note_column::calc_main_extent(him);
126 he = him->extent (him, a);
129 SCM self_align = (a == X_AXIS)
130 ? me->get_property ("self-alignment-X")
131 : me->get_property ("self-alignment-Y");
133 SCM par_align = (a == X_AXIS)
134 ? me->get_property ("parent-alignment-X")
135 : me->get_property ("parent-alignment-Y");
137 if (scm_is_null (par_align))
138 par_align = self_align;
141 Interval ext (me->extent (me, a));
143 if (scm_is_number (self_align))
145 // Empty extent doesn't mean an error - we simply don't align such grobs.
146 // However, empty extent and non-empty stencil would be suspicious.
147 if (!ext.is_empty ())
148 x -= ext.linear_combination (scm_to_double (self_align));
151 Stencil *st = me->get_stencil ();
152 if (st && !st->is_empty ())
153 warning (me->name () + " has empty extent and non-empty stencil.");
157 if (scm_is_number (par_align))
159 // See comment above.
161 x += he.linear_combination (scm_to_double (par_align));
164 Stencil *st = him->get_stencil ();
165 if (st && !st->is_empty ())
166 warning (him->name () + " has empty extent and non-empty stencil.");
170 return scm_from_double (x);
174 Self_alignment_interface::set_aligned_on_parent (Grob *me, Axis a)
176 add_offset_callback (me,
177 (a == X_AXIS) ? aligned_on_x_parent_proc : aligned_on_y_parent_proc,
181 ADD_INTERFACE (Self_alignment_interface,
182 "Position this object on itself and/or on its parent. To this"
183 " end, the following functions are provided:\n"
186 "@item Self_alignment_interface::[xy]_aligned_on_self\n"
187 "Align self on reference point, using"
188 " @code{self-alignment-X} and @code{self-alignment-Y}."
189 "@item Self_alignment_interface::aligned_on_[xy]_parent\n"
190 "@item Self_alignment_interface::centered_on_[xy]_parent\n"
191 "Shift the object so its own reference point is centered on"
192 " the extent of the parent\n"
196 "parent-alignment-X "
197 "parent-alignment-Y "
200 "X-align-on-main-noteheads "