lily/cluster.cc

   1 /*
   2   cluster.cc -- implement Cluster
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2002--2004 Juergen Reuter <reuter@ipd.uka.de>
   7
   8   Han-Wen Nienhuys <hanwen@cs.uu.nl>
   9
  10 */
  11
  12 #include <stdio.h>
  13
  14 #include "cluster.hh"
  15 #include "spanner.hh"
  16 #include "item.hh"
  17 #include "pitch.hh"
  18 #include "staff-symbol-referencer.hh"
  19 #include "lookup.hh"
  20 #include "box.hh"
  21 #include "interval.hh"
  22 #include "paper-def.hh"
  23 #include "warn.hh"
  24
  25
  26 /*
  27    TODO: Add support for cubic spline segments.
  28
  29  */
  30 Stencil
  31 brew_cluster_piece (Grob *me, Array<Offset> bottom_points, Array<Offset> top_points)
  32 {
  33   Real blotdiameter = Staff_symbol_referencer::staff_space (me)/2;
  34
  35   Real padding =robust_scm2double ( me->get_property ("padding"), 0.0);
  36
  37   Offset vpadding = Offset (0, padding);
  38   Offset hpadding = Offset (0.5 * blotdiameter, 0);
  39   Offset hvpadding = 0.5 * hpadding + vpadding;
  40
  41   SCM shape_scm = me->get_property ("style");
  42   String shape;
  43
  44   if (gh_symbol_p (shape_scm))
  45     {
  46       shape = ly_symbol2string (shape_scm);
  47     }
  48   else
  49     {
  50       programming_error ("#'style should be symbol.");
  51       me->suicide ();
  52       return  Stencil ();
  53     }
  54
  55
  56   Stencil out = Stencil ();
  57   Array<Offset> points;
  58   points.clear ();
  59   int size = bottom_points.size ();
  60   if (String::compare (shape, "leftsided-stairs") == 0)
  61     {
  62       for (int i = 0; i < size - 1; i++)
  63         {
  64           Box box;
  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));
  69         }
  70     }
  71   else if (String::compare (shape, "rightsided-stairs") == 0)
  72     {
  73       for (int i = 0; i < size - 1; i++)
  74         {
  75           Box box;
  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));
  80         }
  81     }
  82   else if (String::compare (shape, "centered-stairs") == 0)
  83     {
  84       Real left_xmid = bottom_points[0][X_AXIS];
  85       for (int i = 0; i < size - 1; i++)
  86         {
  87           Real right_xmid =
  88             0.5 * (bottom_points[i][X_AXIS] + bottom_points[i + 1][X_AXIS]);
  89           Box box;
  90           box.add_point (Offset (left_xmid, bottom_points[i][Y_AXIS]) -
  91                          hvpadding);
  92           box.add_point (Offset (right_xmid, top_points[i][Y_AXIS]) +
  93                          hvpadding);
  94           out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
  95           left_xmid = right_xmid;
  96         }
  97       Real right_xmid = bottom_points[size - 1][X_AXIS];
  98       Box box;
  99       box.add_point (Offset (left_xmid, bottom_points[size - 1][Y_AXIS]) -
 100                      hvpadding);
 101       box.add_point (Offset (right_xmid, top_points[size - 1][Y_AXIS]) +
 102                      hvpadding);
 103       out.add_stencil (Lookup::round_filled_box (box, blotdiameter));
 104     }
 105   else if (String::compare (shape, "ramp") == 0)
 106     {
 107       points.push (bottom_points[0] - vpadding + hpadding);
 108       for (int i = 1; i < size - 1; i++)
 109         {
 110           points.push (bottom_points[i] - vpadding);
 111         }
 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--)
 115         {
 116           points.push (top_points[i] + vpadding);
 117         }
 118       points.push (top_points[0] + vpadding + hpadding);
 119       out.add_stencil (Lookup::round_filled_polygon (points, blotdiameter));
 120     }
 121   else
 122     {
 123       me->warning (_f ("unknown cluster style `%s'", shape.to_str0 ()));
 124     }
 125   return out;
 126 }
 127
 128 MAKE_SCHEME_CALLBACK (Cluster,print,1);
 129 SCM
 130 Cluster::print (SCM smob)
 131 {
 132   Grob *me = unsmob_grob (smob);
 133
 134   Spanner *spanner = dynamic_cast<Spanner*> (me);
 135   if (!spanner)
 136     {
 137       me->programming_error ("Cluster::print (): not a spanner");
 138       return SCM_EOL;
 139     }
 140
 141   Item *left_bound = spanner->get_bound (LEFT);
 142   Item *right_bound = spanner->get_bound (RIGHT);
 143
 144   Grob *commonx = left_bound->common_refpoint (right_bound, X_AXIS);
 145   SCM cols  =me->get_property ("columns");
 146
 147   if (!gh_pair_p (cols))
 148     {
 149       me->warning ("junking empty cluster");
 150       me->suicide ();
 151
 152       return SCM_EOL;
 153     }
 154
 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;
 159
 160
 161   Real left_coord = left_bound->relative_coordinate (commonx, X_AXIS);
 162
 163   /*
 164     TODO: should we move the cluster a little to the right to be in
 165     line with the center of the note heads?
 166
 167    */
 168   for (SCM s = cols; gh_pair_p (s); s = ly_cdr (s))
 169     {
 170       Grob * col = unsmob_grob (ly_car (s));
 171       Interval yext = col->extent (commony, Y_AXIS);
 172
 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]));
 176     }
 177
 178   /*
 179     Across a line break we anticipate on the next pitches.
 180    */
 181   if (spanner->original_)
 182     {
 183       Spanner *orig = dynamic_cast<Spanner*> (spanner->original_);
 184
 185       if (spanner->get_break_index () < orig->broken_intos_.size ()-1)
 186         {
 187           Spanner * next = orig->broken_intos_[spanner->get_break_index () + 1];
 188           SCM cols = next->get_property ("columns");
 189           if (gh_pair_p (cols))
 190             {
 191               Grob *next_commony = common_refpoint_of_list (cols, next, Y_AXIS);
 192               Grob * col = unsmob_grob (ly_car (scm_last_pair (cols)));
 193
 194               Interval v = col->extent (next_commony, Y_AXIS);
 195               Real x = right_bound->relative_coordinate (commonx, X_AXIS) - left_coord;
 196
 197               bottom_points.insert (Offset (x, v[DOWN]),0);
 198               top_points.insert (Offset (x, v[UP]),0);
 199             }
 200         }
 201     }
 202
 203   bottom_points.reverse ();
 204   top_points.reverse ();
 205
 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 ();
 209 }
 210
 211 ADD_INTERFACE (Cluster,"cluster-interface",
 212                "A graphically drawn musical cluster. "
 213                "\n\n"
 214                "@code{padding} adds to the vertical extent of the shape (top and "
 215                "bottom). \n\n"
 216                "The property @code{style} controls the shape of cluster segments.  Valid values "
 217                "include @code{leftsided-stairs}, @code{rightsided-stairs}, @code{centered-stairs}, "
 218                "and @code{ramp}.\n"
 219 ,
 220   "style padding columns");
 221
 222
 223
 224 struct Cluster_beacon
 225 {
 226 public:
 227   DECLARE_SCHEME_CALLBACK (height, (SCM, SCM));
 228   static bool has_interface (Grob *);
 229 };
 230
 231 MAKE_SCHEME_CALLBACK (Cluster_beacon,height,2);
 232 SCM
 233 Cluster_beacon::height (SCM g, SCM ax)
 234 {
 235   Grob *me = unsmob_grob (g);
 236
 237   Interval v = robust_scm2interval (me->get_property ("positions"), Interval (0,0));
 238   return ly_interval2scm (Staff_symbol_referencer::staff_space (me) * 0.5  * v);
 239 }
 240
 241
 242
 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.",
 247               "positions");