2 side-position-interface.cc -- implement Side_position_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "side-position-interface.hh"
11 #include <cmath> // ceil.
15 #include "note-head.hh"
18 #include "dimensions.hh"
19 #include "staff-symbol-referencer.hh"
20 #include "pointer-group-interface.hh"
21 #include "directional-element-interface.hh"
22 #include "staff-symbol-referencer.hh"
23 #include "string-convert.hh"
26 Side_position_interface::add_support (Grob *me, Grob *e)
28 Pointer_group_interface::add_grob (me, ly_symbol2scm ("side-support-elements"), e);
32 Side_position_interface::get_direction (Grob *me)
34 Direction relative_dir = Direction (1);
35 SCM reldir = me->get_property ("side-relative-direction"); // should use a lambda.
36 if (is_direction (reldir))
37 relative_dir = to_dir (reldir);
39 SCM other_elt = me->get_object ("direction-source");
40 Grob *e = unsmob_grob (other_elt);
42 return (Direction) (relative_dir * get_grob_direction (e));
47 MAKE_SCHEME_CALLBACK (Side_position_interface, aligned_on_support_extents, 2);
49 Side_position_interface::aligned_on_support_extents (SCM element_smob, SCM axis)
51 Grob *me = unsmob_grob (element_smob);
52 Axis a = (Axis) scm_to_int (axis);
54 return general_side_position (me, a, true);
57 /* Put the element next to the support, optionally taking in
58 account the extent of the support. */
60 Side_position_interface::general_side_position (Grob *me, Axis a, bool use_extents)
62 Real ss = Staff_symbol_referencer::staff_space (me);
64 extract_grob_set (me, "side-support-elements", support);
66 Grob *common = common_refpoint_of_array (support, me->get_parent (a), a);
67 Grob *st = Staff_symbol_referencer::get_staff_symbol (me);
68 bool include_staff = (st
70 && scm_is_number (me->get_property ("staff-padding")));
75 common = st->common_refpoint (common, Y_AXIS);
76 dim = st->extent (common, Y_AXIS);
79 for (int i = 0; i < support.size (); i++)
84 dim.unite (e->extent (common, a));
87 Real x = e->relative_coordinate (common, a);
88 dim.unite (Interval (x, x));
93 dim = Interval (0, 0);
95 Direction dir = get_grob_direction (me);
97 Real off = me->get_parent (a)->relative_coordinate (common, a);
98 Real minimum_space = ss * robust_scm2double (me->get_property ("minimum-space"), -1);
100 Real total_off = dim.linear_combination (dir) - off;
101 total_off += dir * ss * robust_scm2double (me->get_property ("padding"), 0);
103 if (minimum_space >= 0
105 && total_off * dir < minimum_space)
106 total_off = minimum_space * dir;
108 /* FIXME: 100CM should relate to paper size. */
109 if (fabs (total_off) > 100 CM)
112 = String_convert::form_string ("Improbable offset for grob %s: %f%s",
113 me->name ().to_str0 (), total_off,
116 programming_error (msg);
118 return scm_from_double (total_off);
124 MAKE_SCHEME_CALLBACK (Side_position_interface, aligned_on_support_refpoints, 2);
126 Side_position_interface::aligned_on_support_refpoints (SCM smob, SCM axis)
128 Grob *me = unsmob_grob (smob);
129 Axis a = (Axis) scm_to_int (axis);
131 return general_side_position (me, a, false);
135 directed_round (Real f, Direction d)
144 Callback that quantises in staff-spaces, rounding in the direction
145 of the elements "direction" elt property.
147 Only rounds when we're inside the staff, as determined by
148 Staff_symbol_referencer::staff_radius () */
149 MAKE_SCHEME_CALLBACK (Side_position_interface, quantised_position, 2);
151 Side_position_interface::quantised_position (SCM element_smob, SCM)
153 Grob *me = unsmob_grob (element_smob);
155 Direction d = get_grob_direction (me);
157 Grob *stsym = Staff_symbol_referencer::get_staff_symbol (me);
160 Real p = Staff_symbol_referencer::get_position (me);
161 Real rp = directed_round (p, d);
162 Real rad = Staff_symbol_referencer::staff_radius (me) * 2;
165 Grob *head = me->get_parent (X_AXIS);
167 if (Staff_symbol_referencer::on_staffline (me, ip)
168 && ((abs (ip) <= rad)
169 || (Note_head::has_interface (head)
170 && sign (Staff_symbol_referencer::get_position (head))
177 return scm_from_double ((rp - p) * Staff_symbol_referencer::staff_space (me) / 2.0);
179 return scm_from_double (0.0);
183 Position next to support, taking into account my own dimensions and padding.
185 MAKE_SCHEME_CALLBACK (Side_position_interface, aligned_side, 2);
187 Side_position_interface::aligned_side (SCM element_smob, SCM axis)
189 Grob *me = unsmob_grob (element_smob);
190 Axis a = (Axis) scm_to_int (axis);
192 Direction d = get_grob_direction (me);
193 Real o = scm_to_double (aligned_on_support_extents (element_smob, axis));
195 Interval iv = me->extent (me, a);
201 programming_error ("direction unknown, but aligned-side wanted");
208 Maintain a minimum distance to the staff. This is similar to side
209 position with padding, but it will put adjoining objects on a row if
210 stuff sticks out of the staff a little.
212 Grob *st = Staff_symbol_referencer::get_staff_symbol (me);
213 if (st && a == Y_AXIS
214 && scm_is_number (me->get_property ("staff-padding")))
217 = Staff_symbol_referencer::staff_space (me)
218 * scm_to_double (me->get_property ("staff-padding"));
220 Grob *common = me->common_refpoint (st, Y_AXIS);
222 Interval staff_size = st->extent (common, Y_AXIS);
223 Real diff = d*staff_size[d] + padding - d * (o + iv[-d]);
224 o += d * max (diff, 0.0);
227 return scm_from_double (o);
231 Side_position_interface::set_axis (Grob *me, Axis a)
233 me->add_offset_callback (Side_position_interface::aligned_side_proc, a);
236 // ugh. doesn't catch all variants.
238 Side_position_interface::get_axis (Grob *me)
240 if (me->has_offset_callback (Side_position_interface::aligned_side_proc, X_AXIS)
241 || me->has_offset_callback (Side_position_interface::aligned_side_proc, X_AXIS))
247 ADD_INTERFACE (Side_position_interface, "side-position-interface",
248 "Position a victim object (this one) next to other objects (the "
249 "support). The property @code{direction} signifies where to put the "
250 "victim object relative to the support (left or right, up or down?)\n\n "
251 "The routine also takes the size the staff into account if "
252 "@code{staff-padding} is set. If undefined, the staff symbol is ignored.",
259 "side-relative-direction "
260 "side-support-elements "