lily/cluster.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--2010 Juergen Reuter <reuter@ipd.uka.de>
   5   Han-Wen Nienhuys <hanwen@xs4all.nl>
   6
   7   LilyPond is free software: you can redistribute it and/or modify
   8   it under the terms of the GNU General Public License as published by
   9   the Free Software Foundation, either version 3 of the License, or
  10   (at your option) any later version.
  11
  12   LilyPond is distributed in the hope that it will be useful,
  13   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15   GNU General Public License for more details.
  16
  17   You should have received a copy of the GNU General Public License
  18   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "cluster.hh"
  22 #include "international.hh"
  23 #include "item.hh"
  24 #include "lookup.hh"
  25 #include "output-def.hh"
  26 #include "pitch.hh"
  27 #include "pointer-group-interface.hh"
  28 #include "spanner.hh"
  29 #include "staff-symbol-referencer.hh"
  30 #include "warn.hh"
  31
  32 /*
  33   TODO: Add support for cubic spline segments.
  34  */
  35 Stencil
  36 brew_cluster_piece (Grob *me, vector<Offset> bottom_points, vector<Offset> top_points)
  37 {
  38   Real blotdiameter = Staff_symbol_referencer::staff_space (me) / 2;
  39
  40   Real padding = robust_scm2double (me->get_property ("padding"), 0.0);
  41
  42   Offset vpadding = Offset (0, padding);
  43   Offset hpadding = Offset (0.5 * blotdiameter, 0);
  44   Offset hvpadding = 0.5 * hpadding + vpadding;
  45
  46   SCM shape_scm = me->get_property ("style");
  47   string shape;
  48
  49   if (scm_is_symbol (shape_scm))
  50     shape = ly_symbol2string (shape_scm);
  51   else
  52     {
  53       programming_error ("#'style should be symbol.");
  54       me->suicide ();
  55       return Stencil ();
  56     }
  57
  58   Stencil out;
  59   vector<Offset> points;
  60   points.clear ();
  61   int size = bottom_points.size ();
  62   if (shape == "leftsided-stairs")
  63     {
  64       for (int i = 0; i < size - 1; i++)
  65         {
  66           Box box;
  67           box.add_point (bottom_points[i] - hvpadding);
  68           box.add_point (Offset (top_points[i + 1][X_AXIS],
  69                                  top_points[i][Y_AXIS]) + hvpadding);
  70           out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
  71         }
  72     }
  73   else if (shape == "rightsided-stairs")
  74     {
  75       for (int i = 0; i < size - 1; i++)
  76         {
  77           Box box;
  78           box.add_point (Offset (bottom_points[i][X_AXIS],
  79                                  bottom_points[i + 1][Y_AXIS]) - hvpadding);
  80           box.add_point (top_points[i + 1] + hvpadding);
  81           out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
  82         }
  83     }
  84   else if (shape == "centered-stairs")
  85     {
  86       Real left_xmid = bottom_points[0][X_AXIS];
  87       for (int i = 0; i < size - 1; i++)
  88         {
  89           Real right_xmid
  90             = 0.5 * (bottom_points[i][X_AXIS] + bottom_points[i + 1][X_AXIS]);
  91           Box box;
  92           box.add_point (Offset (left_xmid, bottom_points[i][Y_AXIS])
  93                          - hvpadding);
  94           box.add_point (Offset (right_xmid, top_points[i][Y_AXIS])
  95                          + hvpadding);
  96           out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
  97           left_xmid = right_xmid;
  98         }
  99       Real right_xmid = bottom_points[size - 1][X_AXIS];
 100       Box box;
 101       box.add_point (Offset (left_xmid, bottom_points[size - 1][Y_AXIS])
 102                      - hvpadding);
 103       box.add_point (Offset (right_xmid, top_points[size - 1][Y_AXIS])
 104                      + hvpadding);
 105       out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
 106     }
 107   else if (shape == "ramp")
 108     {
 109       points.push_back (bottom_points[0] - vpadding + hpadding);
 110       for (int i = 1; i < size - 1; i++)
 111         points.push_back (bottom_points[i] - vpadding);
 112       points.push_back (bottom_points[size - 1] - vpadding - hpadding);
 113       points.push_back (top_points[size - 1] + vpadding - hpadding);
 114       for (int i = size - 2; i > 0; i--)
 115         points.push_back (top_points[i] + vpadding);
 116       points.push_back (top_points[0] + vpadding + hpadding);
 117       out.add_stencil (Lookup::round_filled_polygon (points, blotdiameter));
 118     }
 119   else
 120     me->warning (_f ("unknown cluster style `%s'", shape.c_str ()));
 121   return out;
 122 }
 123
 124 MAKE_SCHEME_CALLBACK (Cluster, calc_cross_staff, 1);
 125 SCM
 126 Cluster::calc_cross_staff (SCM smob)
 127 {
 128   Grob *me = unsmob_grob (smob);
 129
 130   extract_grob_set (me, "columns", cols);
 131   Grob *commony = common_refpoint_of_array (cols, me, Y_AXIS);
 132
 133   return scm_from_bool (commony != me->get_parent (Y_AXIS));
 134 }
 135
 136 MAKE_SCHEME_CALLBACK (Cluster, print, 1);
 137 SCM
 138 Cluster::print (SCM smob)
 139 {
 140   Grob *me = unsmob_grob (smob);
 141
 142   Spanner *spanner = dynamic_cast<Spanner *> (me);
 143   if (!spanner)
 144     {
 145       me->programming_error ("Cluster::print (): not a spanner");
 146       return SCM_EOL;
 147     }
 148
 149   Item *left_bound = spanner->get_bound (LEFT);
 150   Item *right_bound = spanner->get_bound (RIGHT);
 151
 152   Grob *commonx = left_bound->common_refpoint (right_bound, X_AXIS);
 153
 154   vector<Grob*> const &cols = extract_grob_array (me, "columns");
 155   if (cols.empty ())
 156     {
 157       me->warning (_ ("junking empty cluster"));
 158       me->suicide ();
 159
 160       return SCM_EOL;
 161     }
 162
 163   commonx = common_refpoint_of_array (cols, commonx, X_AXIS);
 164   Grob *commony = common_refpoint_of_array (cols, me, Y_AXIS);
 165   vector<Offset> bottom_points;
 166   vector<Offset> top_points;
 167
 168   Real left_coord = left_bound->relative_coordinate (commonx, X_AXIS);
 169
 170   /*
 171     TODO: should we move the cluster a little to the right to be in
 172     line with the center of the note heads?
 173
 174   */
 175   for (vsize i = 0; i < cols.size (); i++)
 176     {
 177       Grob *col = cols[i];
 178
 179       Interval yext = col->extent (commony, Y_AXIS);
 180
 181       Real x = col->relative_coordinate (commonx, X_AXIS) - left_coord;
 182       bottom_points.push_back (Offset (x, yext[DOWN]));
 183       top_points.push_back (Offset (x, yext[UP]));
 184     }
 185
 186   /*
 187     Across a line break we anticipate on the next pitches.
 188   */
 189   if (Spanner *next = spanner->broken_neighbor (RIGHT))
 190     {
 191       extract_grob_set (next, "columns", next_cols);
 192       if (next_cols.size () > 0)
 193         {
 194           Grob *next_commony = common_refpoint_of_array (next_cols, next, Y_AXIS);
 195           Grob *col = next_cols[0];
 196
 197           Interval v = col->extent (next_commony, Y_AXIS);
 198           Real x = right_bound->relative_coordinate (commonx, X_AXIS) - left_coord;
 199
 200           bottom_points.push_back (Offset (x, v[DOWN]));
 201           top_points.push_back (Offset (x, v[UP]));
 202         }
 203     }
 204
 205   Stencil out = brew_cluster_piece (me, bottom_points, top_points);
 206   out.translate_axis (- me->relative_coordinate (commony, Y_AXIS), Y_AXIS);
 207   return out.smobbed_copy ();
 208 }
 209
 210 ADD_INTERFACE (Cluster,
 211                "A graphically drawn musical cluster.\n"
 212                "\n"
 213                "@code{padding} adds to the vertical extent of the shape (top"
 214                " and bottom).\n"
 215                "\n"
 216                "The property @code{style} controls the shape of cluster"
 217                " segments.  Valid values include @code{leftsided-stairs},"
 218                " @code{rightsided-stairs}, @code{centered-stairs}, and"
 219                " @code{ramp}.\n",
 220
 221                /* properties */
 222                "style "
 223                "padding "
 224                "columns "
 225                );
 226
 227 struct Cluster_beacon
 228 {
 229 public:
 230   DECLARE_SCHEME_CALLBACK (height, (SCM));
 231   DECLARE_GROB_INTERFACE ();
 232 };
 233
 234 MAKE_SCHEME_CALLBACK (Cluster_beacon, height, 1);
 235 SCM
 236 Cluster_beacon::height (SCM g)
 237 {
 238   Grob *me = unsmob_grob (g);
 239   Interval v = robust_scm2interval (me->get_property ("positions"),
 240                                     Interval (0, 0));
 241   return ly_interval2scm (Staff_symbol_referencer::staff_space (me) * 0.5 * v);
 242 }
 243
 244 ADD_INTERFACE (Cluster_beacon,
 245                "A place holder for the cluster spanner to determine the"
 246                " vertical extents of a cluster spanner at this"
 247                " X@tie{}position.",
 248
 249                /* properties */
 250                "positions "
 251                );