2 staff-side.cc -- implement Staff_side_element
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include <math.h> // ceil.
11 #include "side-position-interface.hh"
14 #include "dimensions.hh"
16 #include "staff-symbol-referencer.hh"
17 #include "group-interface.hh"
20 Side_position::add_support (Score_element*me, Score_element*e)
22 Pointer_group_interface (me, "side-support-elements").add_element (e);
28 Side_position::get_direction (Score_element*me)
30 SCM d = me->get_elt_property ("direction");
32 return to_dir (d) ? to_dir (d) : DOWN;
34 Direction relative_dir = UP;
35 SCM reldir = me->get_elt_property ("side-relative-direction"); // should use a lambda.
38 relative_dir = to_dir (reldir);
41 SCM other_elt = me->get_elt_property ("direction-source");
42 Score_element * e = unsmob_element(other_elt);
45 return (Direction)(relative_dir * Side_position::get_direction (e));
52 Callback that does the aligning. Puts the element next to the support
56 Side_position::side_position (Score_element *cme, Axis axis)
58 Score_element* me = (Score_element*)cme;
59 Score_element *common = me->parent_l (axis);
60 SCM support = me->get_elt_property ("side-support-elements");
61 for (SCM s = support; s != SCM_EOL; s = gh_cdr (s))
63 Score_element * e = unsmob_element (gh_car (s));
65 common = common->common_refpoint (e, axis);
69 for (SCM s = support; s != SCM_EOL; s = gh_cdr (s))
72 Score_element * e = unsmob_element ( gh_car (s));
75 Real coord = e->relative_coordinate (common, axis);
77 dim.unite (coord + e->extent (axis));
86 Direction dir = Side_position::get_direction (me);
88 Real off = me->parent_l (axis)->relative_coordinate (common, axis);
89 SCM minimum = me->remove_elt_property ("minimum-space");
91 Real total_off = dim[dir] + off;
92 SCM padding = me->remove_elt_property ("padding");
93 if (gh_number_p (padding))
95 total_off += gh_scm2double (padding) * dir;
97 if (gh_number_p (minimum) && total_off * dir < gh_scm2double (minimum))
99 total_off = gh_scm2double (minimum) * dir;
101 if (fabs (total_off) > 100 CM)
102 programming_error ("Huh ? Improbable staff side dim.");
108 callback that centers the element on itself
111 Side_position::aligned_on_self (Score_element *me, Axis ax)
113 String s ("self-alignment-");
115 s += (ax == X_AXIS) ? "X" : "Y";
117 SCM align (me->get_elt_property (s.ch_C()));
118 if (gh_number_p (align))
120 Interval ext(me->extent (ax));
124 programming_error ("I'm empty. Can't align on self");
129 Real lambda = (0.5 - gh_scm2double (align) / 2.0);
130 return - (lambda * ext[LEFT] + (1 - lambda) * ext[RIGHT]);
133 else if (unsmob_element (align))
135 return - unsmob_element (align)->relative_coordinate (me, ax);
143 directed_round (Real f, Direction d)
152 Callback that quantises in staff-spaces, rounding in the direction
153 of the elements "direction" elt property.
155 Only rounds when we're inside the staff, as determined by
156 Staff_symbol_referencer::staff_radius() */
158 Side_position::quantised_position (Score_element *me, Axis )
160 Direction d = Side_position::get_direction (me);
162 if (Staff_symbol_referencer::has_interface (me))
164 Real p = Staff_symbol_referencer::position_f (me);
165 Real rp = directed_round (p, d);
166 Real rad = Staff_symbol_referencer::staff_radius (me) *2 ;
169 if (abs (ip) < rad && (ip % 2) == 0)
175 return (rp - p) * Staff_symbol_referencer::staff_space (me) / 2.0;
181 Position next to support, taking into account my own dimensions and padding.
184 Side_position::aligned_side (Score_element *me, Axis ax)
187 Direction d = Side_position ::get_direction (me);
188 Real o = side_position (me,ax);
190 Interval iv = me->extent (ax);
196 SCM pad = me->get_elt_property ("padding");
197 if (gh_number_p (pad))
198 o += d *gh_scm2double (pad) ;
204 Position centered on parent.
207 Side_position::centered_on_parent (Score_element * me, Axis a)
209 Score_element *him = me->parent_l (a);
211 return him->extent (a).center ();
216 Side_position::add_staff_support (Score_element*me)
218 Score_element* st = Staff_symbol_referencer::staff_symbol_l (me);
226 Side_position::set_axis (Score_element*me, Axis a)
228 if (!me->has_offset_callback_b (aligned_side, a))
229 me->add_offset_callback (aligned_side, a);
236 Side_position::get_axis (Score_element*me)
238 if (me->has_offset_callback_b (&side_position, X_AXIS)
239 || me->has_offset_callback_b (&aligned_side , X_AXIS))
247 Side_position::set_direction (Score_element*me, Direction d)
249 me->set_elt_property ("direction", gh_int2scm (d));
253 Side_position::set_minimum_space (Score_element*me, Real m)
255 me->set_elt_property ("minimum-space", gh_double2scm (m));
259 Side_position::set_padding (Score_element*me, Real p)
261 me->set_elt_property ("padding", gh_double2scm (p));
265 Side_position::has_interface (Score_element*me)
267 return me->has_interface (ly_symbol2scm ("side-position-interface"));
271 Side_position::supported_b (Score_element*me)
273 SCM s = me->get_elt_property ("side-support-elements");