2 cluster.cc -- implement Cluster
4 source file of the GNU LilyPond music typesetter
6 (c) 2002--2003 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 "paper-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;
36 SCM padding_scm = me->get_grob_property ("padding");
37 if (gh_number_p (padding_scm))
38 padding = gh_scm2double (padding_scm);
41 Offset vpadding = Offset (0, padding);
42 Offset hpadding = Offset (0.5 * blotdiameter, 0);
43 Offset hvpadding = 0.5 * hpadding + vpadding;
45 SCM shape_scm = me->get_grob_property ("style");
48 if (gh_symbol_p (shape_scm))
50 shape = ly_symbol2string (shape_scm);
54 programming_error ("#'style should be symbol.");
60 Molecule out = Molecule ();
63 int size = bottom_points.size ();
64 if (String::compare (shape, "leftsided-stairs") == 0)
66 for (int i = 0; i < size - 1; i++)
69 box.add_point (bottom_points[i] - hvpadding);
70 box.add_point (Offset(top_points[i + 1][X_AXIS],
71 top_points[i][Y_AXIS]) + hvpadding);
72 out.add_molecule (Lookup::round_filled_box (box, blotdiameter));
75 else if (String::compare (shape, "rightsided-stairs") == 0)
77 for (int i = 0; i < size - 1; i++)
80 box.add_point (Offset(bottom_points[i][X_AXIS],
81 bottom_points[i + 1][Y_AXIS]) - hvpadding);
82 box.add_point (top_points[i + 1] + hvpadding);
83 out.add_molecule (Lookup::round_filled_box (box, blotdiameter));
86 else if (String::compare (shape, "centered-stairs") == 0)
88 Real left_xmid = bottom_points[0][X_AXIS];
89 for (int i = 0; i < size - 1; i++)
92 0.5 * (bottom_points[i][X_AXIS] + bottom_points[i + 1][X_AXIS]);
94 box.add_point (Offset (left_xmid, bottom_points[i][Y_AXIS]) -
96 box.add_point (Offset (right_xmid, top_points[i][Y_AXIS]) +
98 out.add_molecule (Lookup::round_filled_box (box, blotdiameter));
99 left_xmid = right_xmid;
101 Real right_xmid = bottom_points[size - 1][X_AXIS];
103 box.add_point (Offset (left_xmid, bottom_points[size - 1][Y_AXIS]) -
105 box.add_point (Offset (right_xmid, top_points[size - 1][Y_AXIS]) +
107 out.add_molecule (Lookup::round_filled_box (box, blotdiameter));
109 else if (String::compare (shape, "ramp") == 0)
111 points.push (bottom_points[0] - vpadding + hpadding);
112 for (int i = 1; i < size - 1; i++)
114 points.push (bottom_points[i] - vpadding);
116 points.push (bottom_points[size - 1] - vpadding - hpadding);
117 points.push (top_points[size - 1] + vpadding - hpadding);
118 for (int i = size - 2; i > 0; i--)
120 points.push (top_points[i] + vpadding);
122 points.push (top_points[0] + vpadding + hpadding);
123 out.add_molecule (Lookup::round_filled_polygon (points, blotdiameter));
127 me->warning (_f ("unknown cluster style `%s'", shape.to_str0 ()));
132 MAKE_SCHEME_CALLBACK (Cluster,brew_molecule,1);
134 Cluster::brew_molecule (SCM smob)
136 Grob *me = unsmob_grob (smob);
138 Spanner *spanner = dynamic_cast<Spanner*> (me);
141 me->programming_error ("Cluster::brew_molecule(): not a spanner");
145 Item *left_bound = spanner->get_bound (LEFT);
146 Item *right_bound = spanner->get_bound (RIGHT);
148 Grob *common = left_bound->common_refpoint (right_bound, X_AXIS);
149 SCM cols =me->get_grob_property ("columns");
151 if (!gh_pair_p (cols))
153 me->warning ("junking empty cluster");
158 common = common_refpoint_of_list (cols, common, X_AXIS);
159 Array<Offset> bottom_points;
160 Array<Offset> top_points;
163 Real left_coord = left_bound->relative_coordinate (common, X_AXIS);
165 Real unit = Staff_symbol_referencer::staff_space (me) *0.5;
168 TODO: should we move the cluster a little to the right to be in
169 line with the center of the note heads?
172 for (SCM s = cols; gh_pair_p (s); s = ly_cdr (s))
174 Grob * col = unsmob_grob (ly_car (s));
176 SCM posns = col->get_grob_property ("positions");
179 if (is_number_pair (posns))
180 s = Slice (gh_scm2int (gh_car (posns)),
181 gh_scm2int (gh_cdr (posns)));
183 Real x = col->relative_coordinate (common, X_AXIS) - left_coord;
184 bottom_points.push (Offset (x, s[DOWN] *unit));
185 top_points.push (Offset (x, s[UP] * unit));
189 Across a line break we anticipate on the next pitches.
191 if (spanner->original_)
193 Spanner *orig = dynamic_cast<Spanner*> (spanner->original_);
195 if (spanner->break_index_ < orig->broken_intos_.size()-1)
197 Spanner * next = orig->broken_intos_[spanner->break_index_+1];
198 SCM cols = next->get_grob_property ("columns");
199 if (gh_pair_p (cols))
201 Grob * col = unsmob_grob (ly_car (scm_last_pair (cols)));
202 SCM posns = col->get_grob_property ("positions");
205 if (is_number_pair (posns))
206 s = Slice (gh_scm2int (gh_car (posns)),
207 gh_scm2int (gh_cdr (posns)));
209 Real x = right_bound->relative_coordinate (common,X_AXIS) - left_coord;
211 bottom_points.insert (Offset (x, s[DOWN] * unit),0);
212 top_points.insert (Offset (x, s[UP] * unit),0);
217 bottom_points.reverse ();
218 top_points.reverse ();
220 Molecule out = brew_cluster_piece (me, bottom_points, top_points);
221 return out.smobbed_copy ();
224 ADD_INTERFACE (Cluster,"cluster-interface",
225 "A graphically drawn musical cluster. "
227 "@code{padding} adds to the vertical extent of the shape (top and "
228 "bottom) and is expressed in units of staffspace. Since the pitch "
229 "range of a single pitch is infinitely small, if padding is set to "
230 "@code{0.0}, this possibly results in an invisible shape, if you,for "
231 "example, say @code{c-\\startCluster d e-\\endCluster}. The default "
232 "value for @code{padding} therefore is @code{0.25}, such that a single "
233 "pitch roughly shows the same height as a note head. "
235 "@code{style} controls the shape of cluster segments. Valid values include 'leftsided-stairs', 'rightsided-stairs', 'centered-stairs', and 'ramp'.\n"
237 "style padding columns");