2 side-position-interface.cc -- implement Side_position_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "side-position-interface.hh"
11 #include <cmath> // ceil.
16 #include "directional-element-interface.hh"
20 #include "note-head.hh"
21 #include "pointer-group-interface.hh"
22 #include "staff-symbol-referencer.hh"
23 #include "staff-symbol.hh"
25 #include "string-convert.hh"
29 Side_position_interface::add_support (Grob *me, Grob *e)
31 Pointer_group_interface::add_unordered_grob (me, ly_symbol2scm ("side-support-elements"), e);
35 Side_position_interface::get_direction (Grob *me)
37 Direction relative_dir = Direction (1);
38 SCM reldir = me->get_property ("side-relative-direction");
39 if (is_direction (reldir))
40 relative_dir = to_dir (reldir);
42 SCM other_elt = me->get_object ("direction-source");
43 Grob *e = unsmob_grob (other_elt);
45 return (Direction) (relative_dir * get_grob_direction (e));
50 /* Put the element next to the support, optionally taking in
51 account the extent of the support.
53 Does not take into account the extent of ME.
56 Side_position_interface::general_side_position (Grob *me, Axis a, bool use_extents,
57 bool include_my_extent,
58 bool pure, int start, int end,
61 Real ss = Staff_symbol_referencer::staff_space (me);
63 extract_grob_set (me, "side-support-elements", support);
65 Grob *common = common_refpoint_of_array (support, me->get_parent (a), a);
66 Grob *staff_symbol = Staff_symbol_referencer::get_staff_symbol (me);
70 && scm_is_number (me->get_property ("staff-padding"))
71 && !to_boolean (me->get_property ("quantize-position"));
74 Interval staff_extents;
77 common = staff_symbol->common_refpoint (common, Y_AXIS);
78 staff_extents = staff_symbol->maybe_pure_extent (common, Y_AXIS, pure, start, end);
81 dim.unite (staff_extents);
84 Direction dir = get_grob_direction (me);
86 for (vsize i = 0; i < support.size (); i++)
90 // In the case of a stem, we will find a note head as well
91 // ignoring the stem solves cyclic dependencies if the stem is
92 // attached to a cross-staff beam.
94 && Stem::has_interface (e)
95 && dir == - get_grob_direction (e))
101 dim.unite (e->maybe_pure_extent (common, a, pure, start, end));
104 Real x = e->maybe_pure_coordinate (common, a, pure, start, end);
105 dim.unite (Interval (x, x));
111 dim = Interval (0, 0);
113 Real off = me->get_parent (a)->maybe_pure_coordinate (common, a, pure, start, end);
114 Real minimum_space = ss * robust_scm2double (me->get_property ("minimum-space"), -1);
116 Real total_off = dim.linear_combination (dir) - off;
117 total_off += dir * ss * robust_scm2double (me->get_property ("padding"), 0);
119 if (minimum_space >= 0
121 && total_off * dir < minimum_space)
122 total_off = minimum_space * dir;
124 if (include_my_extent)
126 Interval iv = me->maybe_pure_extent (me, a, pure, start, end);
131 programming_error ("direction unknown, but aligned-side wanted");
134 total_off += -iv[-dir];
139 total_off = dir * max (dir * total_off,
140 dir * (*current_offset));
143 /* FIXME: 1000 should relate to paper size. */
144 if (fabs (total_off) > 1000)
147 = String_convert::form_string ("Improbable offset for grob %s: %f",
148 me->name ().c_str (), total_off);
150 programming_error (msg);
151 if (strict_infinity_checking)
152 scm_misc_error (__FUNCTION__, "Improbable offset.", SCM_EOL);
154 return scm_from_double (total_off);
158 MAKE_SCHEME_CALLBACK (Side_position_interface, y_aligned_on_support_refpoints, 1);
160 Side_position_interface::y_aligned_on_support_refpoints (SCM smob)
162 return general_side_position (unsmob_grob (smob), Y_AXIS, false, false, false, 0, 0, 0);
165 MAKE_SCHEME_CALLBACK (Side_position_interface, pure_y_aligned_on_support_refpoints, 3);
167 Side_position_interface::pure_y_aligned_on_support_refpoints (SCM smob, SCM start, SCM end)
169 return general_side_position (unsmob_grob (smob), Y_AXIS, false, false,
170 true, scm_to_int (start), scm_to_int (end), 0);
175 Position next to support, taking into account my own dimensions and padding.
178 axis_aligned_side_helper (SCM smob, Axis a, bool pure, int start, int end, SCM current_off_scm)
181 Real *current_off_ptr = 0;
182 if (scm_is_number (current_off_scm))
184 r = scm_to_double (current_off_scm);
185 current_off_ptr = &r;
188 return Side_position_interface::aligned_side (unsmob_grob (smob), a, pure, start, end, current_off_ptr);
192 MAKE_SCHEME_CALLBACK_WITH_OPTARGS (Side_position_interface, x_aligned_side, 2, 1, "");
194 Side_position_interface::x_aligned_side (SCM smob, SCM current_off)
196 return axis_aligned_side_helper (smob, X_AXIS, false, 0, 0, current_off);
199 MAKE_SCHEME_CALLBACK_WITH_OPTARGS (Side_position_interface, y_aligned_side, 2, 1, "");
201 Side_position_interface::y_aligned_side (SCM smob, SCM current_off)
203 return axis_aligned_side_helper (smob, Y_AXIS, false, 0, 0, current_off);
206 MAKE_SCHEME_CALLBACK_WITH_OPTARGS (Side_position_interface, pure_y_aligned_side, 4, 1, "");
208 Side_position_interface::pure_y_aligned_side (SCM smob, SCM start, SCM end, SCM cur_off)
210 return axis_aligned_side_helper (smob, Y_AXIS, true,
216 MAKE_SCHEME_CALLBACK (Side_position_interface, calc_cross_staff, 1)
218 Side_position_interface::calc_cross_staff (SCM smob)
220 Grob *me = unsmob_grob (smob);
221 extract_grob_set (me, "side-support-elements", elts);
223 for (vsize i = 0; i < elts.size (); i++)
224 if (to_boolean (elts[i]->get_property ("cross-staff")))
227 Grob *common = common_refpoint_of_array (elts, me->get_parent (Y_AXIS), Y_AXIS);
228 return scm_from_bool (common != me->get_parent (Y_AXIS));
232 Side_position_interface::aligned_side (Grob *me, Axis a, bool pure, int start, int end,
235 Direction dir = get_grob_direction (me);
237 Real o = scm_to_double (general_side_position (me, a, true, true, pure, start, end, current_off));
240 Maintain a minimum distance to the staff. This is similar to side
241 position with padding, but it will put adjoining objects on a row if
242 stuff sticks out of the staff a little.
244 Grob *staff = Staff_symbol_referencer::get_staff_symbol (me);
245 if (staff && a == Y_AXIS)
247 if (to_boolean (me->get_property ("quantize-position")))
249 Grob *common = me->common_refpoint (staff, Y_AXIS);
250 Real my_off = me->get_parent (Y_AXIS)->maybe_pure_coordinate (common, Y_AXIS, pure, start, end);
251 Real staff_off = staff->maybe_pure_coordinate (common, Y_AXIS, pure, start, end);
252 Real ss = Staff_symbol::staff_space (staff);
253 Real position = 2 * (my_off + o - staff_off) / ss;
254 Real rounded = directed_round (position, dir);
255 Grob *head = me->get_parent (X_AXIS);
257 if (fabs (position) <= 2 * Staff_symbol_referencer::staff_radius (me) + 1
258 /* In case of a ledger lines, quantize even if we're outside the staff. */
259 || (Note_head::has_interface (head)
261 && abs (Staff_symbol_referencer::get_position (head)) > abs (position)))
263 o += (rounded - position) * 0.5 * ss;
264 if (Staff_symbol_referencer::on_line (me, int (rounded)))
268 else if (scm_is_number (me->get_property ("staff-padding")) && dir)
270 Interval iv = me->maybe_pure_extent (me, a, pure, start, end);
273 = Staff_symbol_referencer::staff_space (me)
274 * scm_to_double (me->get_property ("staff-padding"));
276 Grob *common = me->common_refpoint (staff, Y_AXIS);
278 Interval staff_size = staff->maybe_pure_extent (common, Y_AXIS, pure, start, end);
279 Real diff = dir*staff_size[dir] + padding - dir * (o + iv[-dir]);
280 o += dir * max (diff, 0.0);
283 return scm_from_double (o);
287 Side_position_interface::set_axis (Grob *me, Axis a)
289 if (!scm_is_number (me->get_property ("side-axis")))
291 me->set_property ("side-axis", scm_from_int (a));
292 chain_offset_callback (me,
294 ? x_aligned_side_proc
295 : y_aligned_side_proc,
301 Side_position_interface::get_axis (Grob *me)
303 if (scm_is_number (me->get_property ("side-axis")))
304 return Axis (scm_to_int (me->get_property ("side-axis")));
306 string msg = String_convert::form_string ("side-axis not set for grob %s.",
307 me->name ().c_str ());
308 me->programming_error (msg);
312 ADD_INTERFACE (Side_position_interface,
313 "Position a victim object (this one) next to other objects"
314 " (the support). The property @code{direction} signifies where"
315 " to put the victim object relative to the support (left or"
316 " right, up or down?)\n"
318 "The routine also takes the size of the staff into account if"
319 " @code{staff-padding} is set. If undefined, the staff symbol"
329 "side-relative-direction "
330 "side-support-elements "