2 staff-side.cc -- implement Staff_side_element
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include <math.h> // ceil.
11 #include "side-position-interface.hh"
14 #include "dimensions.hh"
15 #include "staff-symbol-referencer.hh"
16 #include "group-interface.hh"
17 #include "directional-element-interface.hh"
20 Side_position_interface::add_support (Grob*me, Grob*e)
22 Pointer_group_interface::add_grob (me, ly_symbol2scm ("side-support-elements"), e);
28 Side_position_interface::get_direction (Grob*me)
30 SCM d = me->get_grob_property ("direction");
31 if (is_direction (d) && to_dir (d))
34 Direction relative_dir = Direction (1);
35 SCM reldir = me->get_grob_property ("side-relative-direction"); // should use a lambda.
36 if (is_direction (reldir))
38 relative_dir = to_dir (reldir);
41 SCM other_elt = me->get_grob_property ("direction-source");
42 Grob * e = unsmob_grob (other_elt);
45 return (Direction) (relative_dir * get_grob_direction (e));
52 MAKE_SCHEME_CALLBACK (Side_position_interface,aligned_on_support_extents, 2);
54 Side_position_interface::aligned_on_support_extents (SCM element_smob, SCM axis)
56 Grob *me = unsmob_grob (element_smob);
57 Axis a = (Axis) gh_scm2int (axis);
59 return general_side_position (me, a, true);
64 Puts the element next to the support, optionally taking in
65 account the extent of the support.
68 Side_position_interface::general_side_position (Grob * me, Axis a, bool use_extents)
73 As this is only used as a callback, this is called only once. We
74 could wipe SIDE-SUPPORT-ELEMENTS after we retrieve it to conserve
75 memory; however -- we should look more into benefits of such actions?
77 The benefit is small, it seems: total GC times taken don't
78 differ. Would this also hamper Generational GC ?
81 SCM support = me->get_grob_property ("side-support-elements");
82 Grob *common = common_refpoint_of_list (support, me->get_parent (a), a);
85 for (SCM s = support; s != SCM_EOL; s = ly_cdr (s))
87 Grob * e = unsmob_grob (ly_car (s));
90 dim.unite (e->extent (common, a));
93 Real x = e->relative_coordinate (common, a);
94 dim.unite (Interval (x,x));
100 dim = Interval (0,0);
103 Direction dir = Side_position_interface::get_direction (me);
105 Real off = me->get_parent (a)->relative_coordinate (common, a);
106 SCM minimum = me->get_grob_property ("minimum-space");
108 Real total_off = dim.linear_combination (dir) - off;
109 total_off += robust_scm2double ( me->get_grob_property ("padding"), 0);
111 if (gh_number_p (minimum)
113 && total_off * dir < gh_scm2double (minimum))
115 total_off = gh_scm2double (minimum) * dir;
118 if (fabs (total_off) > 100 CM)
119 programming_error ("Huh ? Improbable staff side dim.");
121 return gh_double2scm (total_off);
127 MAKE_SCHEME_CALLBACK (Side_position_interface,aligned_on_support_refpoints,2);
129 Side_position_interface::aligned_on_support_refpoints (SCM smob, SCM axis)
131 Grob *me = unsmob_grob (smob);
132 Axis a = (Axis) gh_scm2int (axis);
134 return general_side_position (me, a, false);
141 directed_round (Real f, Direction d)
150 Callback that quantises in staff-spaces, rounding in the direction
151 of the elements "direction" elt property.
153 Only rounds when we're inside the staff, as determined by
154 Staff_symbol_referencer::staff_radius () */
155 MAKE_SCHEME_CALLBACK (Side_position_interface,quantised_position,2);
157 Side_position_interface::quantised_position (SCM element_smob, SCM)
159 Grob *me = unsmob_grob (element_smob);
161 Direction d = Side_position_interface::get_direction (me);
163 Grob * stsym = Staff_symbol_referencer::get_staff_symbol (me);
166 Real p = Staff_symbol_referencer::get_position (me);
167 Real rp = directed_round (p, d);
168 Real rad = Staff_symbol_referencer::staff_radius (me) *2 ;
171 if (abs (ip) <= rad && Staff_symbol_referencer::on_staffline (me,ip))
177 return gh_double2scm ((rp - p) * Staff_symbol_referencer::staff_space (me) / 2.0);
179 return gh_double2scm (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) gh_scm2int (axis);
192 Direction d = Side_position_interface::get_direction (me);
194 Real o = gh_scm2double (aligned_on_support_extents (element_smob,axis));
196 Interval iv = me->extent (me, a);
202 programming_error ("Direction unknown, but aligned-side wanted.");
207 return gh_double2scm (o);
211 Maintain a minimum distance to the staff. This is similar to side
212 position with padding, but it will put adjoining objects on a row if
213 stuff sticks out of the staff a little.
215 MAKE_SCHEME_CALLBACK (Side_position_interface,out_of_staff,2);
217 Side_position_interface::out_of_staff (SCM element_smob, SCM axis)
219 Grob *me = unsmob_grob (element_smob);
220 Axis a = (Axis) gh_scm2int (axis);
222 Grob * st = Staff_symbol_referencer::get_staff_symbol (me);
225 return gh_int2scm (0);
227 Real padding= robust_scm2double ( me->get_grob_property ("staff-padding"), 0);
229 Grob *common = me->common_refpoint (st, Y_AXIS);
230 Direction d = Side_position_interface::get_direction (me);
231 Interval staff_size = st->extent (common, Y_AXIS);
232 Interval me_ext = me->extent (common, a);
233 Real diff = d*staff_size[d] + padding - d*me_ext[-d];
234 return gh_double2scm (d* (diff >? 0));
238 Side_position_interface::add_staff_support (Grob*me)
240 Grob* st = Staff_symbol_referencer::get_staff_symbol (me);
241 if (st && get_axis (me) == Y_AXIS)
248 Side_position_interface::set_axis (Grob*me, Axis a)
250 me->add_offset_callback (Side_position_interface::aligned_side_proc, a);
255 // ugh. doesn't cactch all variants.
257 Side_position_interface::get_axis (Grob*me)
259 if (me->has_offset_callback_b (Side_position_interface::aligned_side_proc, X_AXIS)
260 || me->has_offset_callback_b (Side_position_interface::aligned_side_proc , X_AXIS))
268 Side_position_interface::set_direction (Grob*me, Direction d)
270 me->set_grob_property ("direction", gh_int2scm (d));
274 Side_position_interface::set_minimum_space (Grob*me, Real m)
276 me->set_grob_property ("minimum-space", gh_double2scm (m));
280 Side_position_interface::set_padding (Grob*me, Real p)
282 me->set_grob_property ("padding", gh_double2scm (p));
287 Side_position_interface::supported_b (Grob*me)
289 SCM s = me->get_grob_property ("side-support-elements");
290 return gh_pair_p (s);
296 ADD_INTERFACE (Side_position_interface,"side-position-interface",
297 "Position a victim object (this one) next to other objects (the "
298 "support). In this case, the property @code{direction} signifies where to put the "
299 "victim object relative to the support (left or right, up or down?) "
301 "staff-padding side-support-elements direction-source direction side-relative-direction minimum-space padding");