2 staff-side.cc -- implement Staff_side_element
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2002 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 (ly_dir_p (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 (ly_dir_p (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 * Directional_element_interface::get (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 SCM padding = me->get_grob_property ("padding");
110 if (gh_number_p (padding))
112 total_off += gh_scm2double (padding) * dir;
115 if (gh_number_p (minimum)
117 && total_off * dir < gh_scm2double (minimum))
119 total_off = gh_scm2double (minimum) * dir;
122 if (fabs (total_off) > 100 CM)
123 programming_error ("Huh ? Improbable staff side dim.");
125 return gh_double2scm (total_off);
131 MAKE_SCHEME_CALLBACK (Side_position_interface,aligned_on_support_refpoints,2);
133 Side_position_interface::aligned_on_support_refpoints (SCM smob, SCM axis)
135 Grob *me = unsmob_grob (smob);
136 Axis a = (Axis) gh_scm2int (axis);
138 return general_side_position (me, a, false);
145 directed_round (Real f, Direction d)
154 Callback that quantises in staff-spaces, rounding in the direction
155 of the elements "direction" elt property.
157 Only rounds when we're inside the staff, as determined by
158 Staff_symbol_referencer::staff_radius () */
159 MAKE_SCHEME_CALLBACK (Side_position_interface,quantised_position,2);
161 Side_position_interface::quantised_position (SCM element_smob, SCM)
163 Grob *me = unsmob_grob (element_smob);
165 Direction d = Side_position_interface::get_direction (me);
167 Grob * stsym = Staff_symbol_referencer::get_staff_symbol (me);
170 Real p = Staff_symbol_referencer::get_position (me);
171 Real rp = directed_round (p, d);
172 Real rad = Staff_symbol_referencer::staff_radius (me) *2 ;
175 if (abs (ip) <= rad && Staff_symbol_referencer::on_staffline (me,ip))
181 return gh_double2scm ((rp - p) * Staff_symbol_referencer::staff_space (me) / 2.0);
183 return gh_double2scm (0.0);
187 Position next to support, taking into account my own dimensions and padding.
189 MAKE_SCHEME_CALLBACK (Side_position_interface,aligned_side,2);
191 Side_position_interface::aligned_side (SCM element_smob, SCM axis)
193 Grob *me = unsmob_grob (element_smob);
194 Axis a = (Axis) gh_scm2int (axis);
196 Direction d = Side_position_interface::get_direction (me);
198 Real o = gh_scm2double (aligned_on_support_extents (element_smob,axis));
200 Interval iv = me->extent (me, a);
206 programming_error ("Direction unknown, but aligned-side wanted.");
211 return gh_double2scm (o);
215 Side_position_interface::add_staff_support (Grob*me)
217 Grob* st = Staff_symbol_referencer::get_staff_symbol (me);
218 if (st && get_axis (me) == Y_AXIS)
225 Side_position_interface::set_axis (Grob*me, Axis a)
227 me->add_offset_callback (Side_position_interface::aligned_side_proc, a);
232 // ugh. doesn't cactch all variants.
234 Side_position_interface::get_axis (Grob*me)
236 if (me->has_offset_callback_b (Side_position_interface::aligned_side_proc, X_AXIS)
237 || me->has_offset_callback_b (Side_position_interface::aligned_side_proc , X_AXIS))
245 Side_position_interface::set_direction (Grob*me, Direction d)
247 me->set_grob_property ("direction", gh_int2scm (d));
251 Side_position_interface::set_minimum_space (Grob*me, Real m)
253 me->set_grob_property ("minimum-space", gh_double2scm (m));
257 Side_position_interface::set_padding (Grob*me, Real p)
259 me->set_grob_property ("padding", gh_double2scm (p));
264 Side_position_interface::supported_b (Grob*me)
266 SCM s = me->get_grob_property ("side-support-elements");
267 return gh_pair_p (s);
273 ADD_INTERFACE (Side_position_interface,"side-position-interface",
274 "Position a victim object (this one) next to other objects (the "
275 "support). In this case, the direction signifies where to put the "
276 "victim object relative to the support (left or right, up or down?) "
278 "side-support-elements direction-source direction side-relative-direction minimum-space padding");