2 cluster.cc -- implement Cluster
4 source file of the GNU LilyPond music typesetter
6 (c) 2002--2004 Juergen Reuter <reuter@ipd.uka.de>
8 Han-Wen Nienhuys <hanwen@cs.uu.nl>
18 #include "staff-symbol-referencer.hh"
21 #include "interval.hh"
22 #include "output-def.hh"
27 TODO: Add support for cubic spline segments.
31 brew_cluster_piece (Grob *me, Array<Offset> bottom_points, Array<Offset> top_points)
33 Real blotdiameter = Staff_symbol_referencer::staff_space (me)/2;
35 Real padding =robust_scm2double ( me->get_property ("padding"), 0.0);
37 Offset vpadding = Offset (0, padding);
38 Offset hpadding = Offset (0.5 * blotdiameter, 0);
39 Offset hvpadding = 0.5 * hpadding + vpadding;
41 SCM shape_scm = me->get_property ("style");
44 if (scm_is_symbol (shape_scm))
46 shape = ly_symbol2string (shape_scm);
50 programming_error ("#'style should be symbol.");
59 int size = bottom_points.size ();
60 if (String::compare (shape, "leftsided-stairs") == 0)
62 for (int i = 0; i < size - 1; i++)
65 box.add_point (bottom_points[i] - hvpadding);
66 box.add_point (Offset (top_points[i + 1][X_AXIS],
67 top_points[i][Y_AXIS]) + hvpadding);
68 out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
71 else if (String::compare (shape, "rightsided-stairs") == 0)
73 for (int i = 0; i < size - 1; i++)
76 box.add_point (Offset (bottom_points[i][X_AXIS],
77 bottom_points[i + 1][Y_AXIS]) - hvpadding);
78 box.add_point (top_points[i + 1] + hvpadding);
79 out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
82 else if (String::compare (shape, "centered-stairs") == 0)
84 Real left_xmid = bottom_points[0][X_AXIS];
85 for (int i = 0; i < size - 1; i++)
88 0.5 * (bottom_points[i][X_AXIS] + bottom_points[i + 1][X_AXIS]);
90 box.add_point (Offset (left_xmid, bottom_points[i][Y_AXIS]) -
92 box.add_point (Offset (right_xmid, top_points[i][Y_AXIS]) +
94 out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
95 left_xmid = right_xmid;
97 Real right_xmid = bottom_points[size - 1][X_AXIS];
99 box.add_point (Offset (left_xmid, bottom_points[size - 1][Y_AXIS]) -
101 box.add_point (Offset (right_xmid, top_points[size - 1][Y_AXIS]) +
103 out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
105 else if (String::compare (shape, "ramp") == 0)
107 points.push (bottom_points[0] - vpadding + hpadding);
108 for (int i = 1; i < size - 1; i++)
110 points.push (bottom_points[i] - vpadding);
112 points.push (bottom_points[size - 1] - vpadding - hpadding);
113 points.push (top_points[size - 1] + vpadding - hpadding);
114 for (int i = size - 2; i > 0; i--)
116 points.push (top_points[i] + vpadding);
118 points.push (top_points[0] + vpadding + hpadding);
119 out.add_stencil (Lookup::round_filled_polygon (points, blotdiameter));
123 me->warning (_f ("unknown cluster style `%s'", shape.to_str0 ()));
128 MAKE_SCHEME_CALLBACK (Cluster,print,1);
130 Cluster::print (SCM smob)
132 Grob *me = unsmob_grob (smob);
134 Spanner *spanner = dynamic_cast<Spanner*> (me);
137 me->programming_error ("Cluster::print (): not a spanner");
141 Item *left_bound = spanner->get_bound (LEFT);
142 Item *right_bound = spanner->get_bound (RIGHT);
144 Grob *commonx = left_bound->common_refpoint (right_bound, X_AXIS);
145 SCM cols =me->get_property ("columns");
147 if (!scm_is_pair (cols))
149 me->warning ("junking empty cluster");
155 commonx = common_refpoint_of_list (cols, commonx, X_AXIS);
156 Grob * commony = common_refpoint_of_list (cols, me, Y_AXIS);
157 Array<Offset> bottom_points;
158 Array<Offset> top_points;
161 Real left_coord = left_bound->relative_coordinate (commonx, X_AXIS);
164 TODO: should we move the cluster a little to the right to be in
165 line with the center of the note heads?
168 for (SCM s = cols; scm_is_pair (s); s = scm_cdr (s))
170 Grob * col = unsmob_grob (scm_car (s));
171 Interval yext = col->extent (commony, Y_AXIS);
173 Real x = col->relative_coordinate (commonx, X_AXIS) - left_coord;
174 bottom_points.push (Offset (x, yext[DOWN]));
175 top_points.push (Offset (x, yext[UP]));
179 Across a line break we anticipate on the next pitches.
181 if (spanner->original_)
183 Spanner *orig = dynamic_cast<Spanner*> (spanner->original_);
185 if (spanner->get_break_index () < orig->broken_intos_.size ()-1)
187 Spanner * next = orig->broken_intos_[spanner->get_break_index () + 1];
188 SCM cols = next->get_property ("columns");
189 if (scm_is_pair (cols))
191 Grob *next_commony = common_refpoint_of_list (cols, next, Y_AXIS);
192 Grob * col = unsmob_grob (scm_car (scm_last_pair (cols)));
194 Interval v = col->extent (next_commony, Y_AXIS);
195 Real x = right_bound->relative_coordinate (commonx, X_AXIS) - left_coord;
197 bottom_points.insert (Offset (x, v[DOWN]),0);
198 top_points.insert (Offset (x, v[UP]),0);
203 bottom_points.reverse ();
204 top_points.reverse ();
206 Stencil out = brew_cluster_piece (me, bottom_points, top_points);
207 out.translate_axis (- me->relative_coordinate (commony, Y_AXIS), Y_AXIS);
208 return out.smobbed_copy ();
211 ADD_INTERFACE (Cluster,"cluster-interface",
212 "A graphically drawn musical cluster. "
214 "@code{padding} adds to the vertical extent of the shape (top and "
216 "The property @code{style} controls the shape of cluster segments. Valid values "
217 "include @code{leftsided-stairs}, @code{rightsided-stairs}, @code{centered-stairs}, "
220 "style padding columns");
224 struct Cluster_beacon
227 DECLARE_SCHEME_CALLBACK (height, (SCM, SCM));
228 static bool has_interface (Grob *);
231 MAKE_SCHEME_CALLBACK (Cluster_beacon,height,2);
233 Cluster_beacon::height (SCM g, SCM)
235 Grob *me = unsmob_grob (g);
236 Interval v = robust_scm2interval (me->get_property ("positions"),
238 return ly_interval2scm (Staff_symbol_referencer::staff_space (me) * 0.5 * v);
243 ADD_INTERFACE(Cluster_beacon,
244 "cluster-beacon-interface",
245 "A place holder for the cluster spanner to determine the vertical "
246 "extents of a cluster spanner at this X position.",