2 staff-side.cc -- implement Staff_side_element
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "side-position-interface.hh"
12 #include <cmath> // ceil.
14 #include "note-head.hh"
17 #include "dimensions.hh"
18 #include "staff-symbol-referencer.hh"
19 #include "group-interface.hh"
20 #include "directional-element-interface.hh"
21 #include "staff-symbol-referencer.hh"
24 Side_position_interface::add_support (Grob*me, Grob*e)
26 Pointer_group_interface::add_grob (me, ly_symbol2scm ("side-support-elements"), e);
30 Side_position_interface::get_direction (Grob*me)
32 SCM d = me->get_property ("direction");
33 if (is_direction (d) && to_dir (d))
36 Direction relative_dir = Direction (1);
37 SCM reldir = me->get_property ("side-relative-direction"); // should use a lambda.
38 if (is_direction (reldir))
40 relative_dir = to_dir (reldir);
43 SCM other_elt = me->get_property ("direction-source");
44 Grob * e = unsmob_grob (other_elt);
47 return (Direction) (relative_dir * get_grob_direction (e));
54 MAKE_SCHEME_CALLBACK (Side_position_interface,aligned_on_support_extents, 2);
56 Side_position_interface::aligned_on_support_extents (SCM element_smob, SCM axis)
58 Grob *me = unsmob_grob (element_smob);
59 Axis a = (Axis) scm_to_int (axis);
61 return general_side_position (me, a, true);
66 Puts the element next to the support, optionally taking in
67 account the extent of the support.
70 Side_position_interface::general_side_position (Grob * me, Axis a, bool use_extents)
72 Real ss = Staff_symbol_referencer::staff_space (me);
73 SCM support = me->get_property ("side-support-elements");
74 Grob *common = common_refpoint_of_list (support, me->get_parent (a), a);
75 Grob * st = Staff_symbol_referencer::get_staff_symbol (me);
76 bool include_staff = (st
78 && scm_is_number (me->get_property ("staff-padding")));
83 common = st->common_refpoint (common, Y_AXIS);
84 dim = st->extent (common, Y_AXIS);
87 for (SCM s = support; s != SCM_EOL; s = scm_cdr (s))
89 Grob * e = unsmob_grob (scm_car (s));
92 dim.unite (e->extent (common, a));
95 Real x = e->relative_coordinate (common, a);
96 dim.unite (Interval (x,x));
102 dim = Interval (0,0);
105 Direction dir = Side_position_interface::get_direction (me);
107 Real off = me->get_parent (a)->relative_coordinate (common, a);
108 Real minimum_space = ss * robust_scm2double (me->get_property ("minimum-space"), -1);
110 Real total_off = dim.linear_combination (dir) - off;
111 total_off += dir * ss * robust_scm2double (me->get_property ("padding"), 0);
113 if (minimum_space >= 0
115 && total_off * dir < minimum_space)
117 total_off = minimum_space * dir;
120 if (fabs (total_off) > 100 CM)
121 programming_error ("Huh ? Improbable staff side dim.");
126 return scm_make_real (total_off);
132 MAKE_SCHEME_CALLBACK (Side_position_interface,aligned_on_support_refpoints,2);
134 Side_position_interface::aligned_on_support_refpoints (SCM smob, SCM axis)
136 Grob *me = unsmob_grob (smob);
137 Axis a = (Axis) scm_to_int (axis);
139 return general_side_position (me, a, false);
146 directed_round (Real f, Direction d)
155 Callback that quantises in staff-spaces, rounding in the direction
156 of the elements "direction" elt property.
158 Only rounds when we're inside the staff, as determined by
159 Staff_symbol_referencer::staff_radius () */
160 MAKE_SCHEME_CALLBACK (Side_position_interface,quantised_position,2);
162 Side_position_interface::quantised_position (SCM element_smob, SCM)
164 Grob *me = unsmob_grob (element_smob);
166 Direction d = Side_position_interface::get_direction (me);
168 Grob * stsym = Staff_symbol_referencer::get_staff_symbol (me);
171 Real p = Staff_symbol_referencer::get_position (me);
172 Real rp = directed_round (p, d);
173 Real rad = Staff_symbol_referencer::staff_radius (me) *2 ;
176 Grob *head = me->get_parent (X_AXIS);
178 if (Staff_symbol_referencer::on_staffline (me,ip)
179 && ((abs (ip) <= rad)
180 || (Note_head::has_interface (head)
181 && sign (Staff_symbol_referencer::get_position (head))
189 return scm_make_real ((rp - p) * Staff_symbol_referencer::staff_space (me) / 2.0);
191 return scm_make_real (0.0);
195 Position next to support, taking into account my own dimensions and padding.
197 MAKE_SCHEME_CALLBACK (Side_position_interface,aligned_side,2);
199 Side_position_interface::aligned_side (SCM element_smob, SCM axis)
201 Grob *me = unsmob_grob (element_smob);
202 Axis a = (Axis) scm_to_int (axis);
204 Direction d = Side_position_interface::get_direction (me);
206 Real o = scm_to_double (aligned_on_support_extents (element_smob,axis));
208 Interval iv = me->extent (me, a);
214 programming_error ("Direction unknown, but aligned-side wanted.");
221 Maintain a minimum distance to the staff. This is similar to side
222 position with padding, but it will put adjoining objects on a row if
223 stuff sticks out of the staff a little.
225 Grob * st = Staff_symbol_referencer::get_staff_symbol (me);
226 if (st && a == Y_AXIS
227 && scm_is_number (me->get_property ("staff-padding")))
230 Staff_symbol_referencer::staff_space (me)
231 * scm_to_double (me->get_property ("staff-padding"));
233 Grob *common = me->common_refpoint (st, Y_AXIS);
235 Interval staff_size = st->extent (common, Y_AXIS);
236 Real diff = d*staff_size[d] + padding - d*(o + iv[-d]);
237 o += (d* (diff >? 0));
240 return scm_make_real (o);
245 Side_position_interface::set_axis (Grob*me, Axis a)
247 me->add_offset_callback (Side_position_interface::aligned_side_proc, a);
250 // ugh. doesn't catch all variants.
252 Side_position_interface::get_axis (Grob*me)
254 if (me->has_offset_callback (Side_position_interface::aligned_side_proc, X_AXIS)
255 || me->has_offset_callback (Side_position_interface::aligned_side_proc , X_AXIS))
262 ADD_INTERFACE (Side_position_interface,"side-position-interface",
263 "Position a victim object (this one) next to other objects (the "
264 "support). The property @code{direction} signifies where to put the "
265 "victim object relative to the support (left or right, up or down?)\n\n "
266 "The routine also takes the size the staff into account if "
267 "@code{staff-padding} is set. If undefined, the staff symbol is ignored."
269 "staff-padding side-support-elements direction-source "
270 "direction side-relative-direction minimum-space padding");