lily/vaticana-ligature.cc

   1 /*
   2   vaticana-ligature.cc -- implement Vaticana_ligature
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2003--2009 Juergen Reuter <reuter@ipd.uka.de>
   7 */
   8
   9 #include "vaticana-ligature.hh"
  10
  11 #include "bezier.hh"
  12 #include "font-interface.hh"
  13 #include "international.hh"
  14 #include "item.hh"
  15 #include "lookup.hh"
  16 #include "note-head.hh"
  17 #include "output-def.hh"
  18 #include "staff-symbol-referencer.hh"
  19 #include "warn.hh"
  20
  21 Stencil
  22 vaticana_brew_cauda (Grob *me,
  23                      int pos,
  24                      int delta_pitch,
  25                      Real thickness,
  26                      Real blotdiameter)
  27 {
  28   bool on_staffline = Staff_symbol_referencer::on_line (me, pos);
  29   int interspaces = Staff_symbol_referencer::line_count (me) - 1;
  30   bool above_staff = pos > interspaces;
  31
  32   if (delta_pitch > -1)
  33     {
  34       me->programming_error ("flexa cauda: invalid delta_pitch; assuming -1");
  35       delta_pitch = -1;
  36     }
  37   Real length;
  38   if (on_staffline)
  39     {
  40       if (delta_pitch >= -1)
  41         length = 1.30;
  42       else if (delta_pitch >= -2)
  43         length = 1.35;
  44       else
  45         length = 1.85;
  46     }
  47   else
  48     {
  49       if (delta_pitch >= -1)
  50         if (above_staff)
  51           length = 1.30;
  52         else
  53           length = 1.00;
  54       else if (delta_pitch >= -2)
  55         length = 1.35;
  56       else if (delta_pitch >= -3)
  57         length = 1.50;
  58       else
  59         length = 1.85;
  60     }
  61   Box cauda_box (Interval (0, thickness), Interval (-length, 0));
  62   return Lookup::round_filled_box (cauda_box, blotdiameter);
  63 }
  64
  65 /*
  66  * TODO: move this function to class Lookup?
  67  */
  68 Stencil
  69 vaticana_brew_flexa (Grob *me,
  70                      bool solid,
  71                      Real line_thickness)
  72 {
  73   Real staff_space = Staff_symbol_referencer::staff_space (me);
  74   Stencil stencil;
  75   Real right_height = 0.6 * staff_space;
  76
  77   Real interval;
  78   SCM flexa_height_scm = me->get_property ("flexa-height");
  79   if (flexa_height_scm != SCM_EOL)
  80     interval = scm_to_int (flexa_height_scm);
  81   else
  82     {
  83       me->warning ("Vaticana_ligature: "
  84                    + _ ("flexa-height undefined; assuming 0"));
  85       interval = 0.0;
  86     }
  87
  88   if (interval >= 0.0)
  89     me->warning (_ ("ascending vaticana style flexa"));
  90
  91   Real width = robust_scm2double (me->get_property ("flexa-width"), 2);
  92
  93   /*
  94    * Compensate curve thickness that appears to be smaller in steep
  95    * section of bend.
  96    */
  97   Real left_height
  98     = right_height
  99     + min (0.12 * abs (interval), 0.3) * staff_space;
 100
 101   /*
 102    * Compensate optical illusion regarding vertical position of left
 103    * and right endings due to curved shape.
 104    */
 105   Real ypos_correction = -0.1 * staff_space * sign (interval);
 106   Real interval_correction = 0.2 * staff_space * sign (interval);
 107   Real corrected_interval = interval * staff_space + interval_correction;
 108
 109   /*
 110    * middle curve of flexa shape
 111    */
 112   Bezier curve;
 113   curve.control_[0] = Offset (0.00 * width, 0.0);
 114   curve.control_[1] = Offset (0.33 * width, corrected_interval / 2.0);
 115   curve.control_[2] = Offset (0.66 * width, corrected_interval / 2.0);
 116   curve.control_[3] = Offset (1.00 * width, corrected_interval / 2.0);
 117
 118   Bezier top_curve = curve, bottom_curve = curve;
 119   for (int i = 0; i < 4; i++)
 120     {
 121       Real curve_thickness = 0.33 * ((3 - i) * left_height + i * right_height);
 122       top_curve.control_[i] += Offset (0, 0.5 * curve_thickness);
 123       bottom_curve.control_[i] -= Offset (0, 0.5 * curve_thickness);
 124     }
 125
 126   if (solid)
 127     {
 128       Stencil solid_head
 129         = Lookup::bezier_sandwich (top_curve, bottom_curve);
 130       stencil.add_stencil (solid_head);
 131     }
 132   else // outline
 133     {
 134       Bezier inner_top_curve = top_curve;
 135       inner_top_curve.translate (Offset (0.0, -line_thickness));
 136       Stencil top_edge
 137         = Lookup::bezier_sandwich (top_curve, inner_top_curve);
 138       stencil.add_stencil (top_edge);
 139
 140       Bezier inner_bottom_curve = bottom_curve;
 141       inner_bottom_curve.translate (Offset (0.0, +line_thickness));
 142       Stencil bottom_edge
 143         = Lookup::bezier_sandwich (bottom_curve, inner_bottom_curve);
 144       stencil.add_stencil (bottom_edge);
 145
 146       /*
 147        * TODO: Use horizontal slope with proper slope value rather
 148        * than filled box for left edge, since the filled box stands
 149        * out from the flexa shape if the interval is big and the line
 150        * thickness small.  The difficulty here is to compute a proper
 151        * slope value, as it should roughly be equal with the slope of
 152        * the left end of the bezier curve.
 153        */
 154       Box left_edge_box (Interval (0, line_thickness),
 155                          Interval (-0.5 * left_height, +0.5 * left_height));
 156       Stencil left_edge = Lookup::filled_box (left_edge_box);
 157       stencil.add_stencil (left_edge);
 158
 159       Box right_edge_box (Interval (-line_thickness, 0),
 160                           Interval (-0.5 * right_height, +0.5 * right_height));
 161       Stencil right_edge = Lookup::filled_box (right_edge_box);
 162       right_edge.translate_axis (width, X_AXIS);
 163       right_edge.translate_axis (corrected_interval / 2.0, Y_AXIS);
 164       stencil.add_stencil (right_edge);
 165     }
 166   stencil.translate_axis (ypos_correction, Y_AXIS);
 167   return stencil;
 168 }
 169
 170 Stencil
 171 vaticana_brew_join (Grob *me, int delta_pitch,
 172                     Real join_thickness, Real blotdiameter)
 173 {
 174   Real staff_space = Staff_symbol_referencer::staff_space (me);
 175   if (!delta_pitch)
 176     {
 177       me->programming_error (_ ("Vaticana_ligature: "
 178                                 "zero join (delta_pitch == 0)"));
 179       return Lookup::blank (Box (Interval (0, 0), Interval (0, 0)));
 180     }
 181   Interval x_extent = Interval (0, join_thickness);
 182   Interval y_extent = (delta_pitch > 0)
 183     ? Interval (0, delta_pitch * 0.5 * staff_space) : // ascending join
 184     Interval (delta_pitch * 0.5 * staff_space, 0); // descending join
 185   Box join_box (x_extent, y_extent);
 186   return Lookup::round_filled_box (join_box, blotdiameter);
 187 }
 188
 189 Stencil
 190 vaticana_brew_primitive (Grob *me)
 191 {
 192   SCM glyph_name_scm = me->get_property ("glyph-name");
 193   if (glyph_name_scm == SCM_EOL)
 194     {
 195       me->programming_error ("Vaticana_ligature: "
 196                              "undefined glyph-name -> ignoring grob");
 197       return Lookup::blank (Box (Interval (0, 0), Interval (0, 0)));
 198     }
 199
 200   string glyph_name = ly_scm2string (glyph_name_scm);
 201
 202   Stencil out;
 203   Real thickness = robust_scm2double (me->get_property ("thickness"), 1);
 204
 205   Real line_thickness
 206     = thickness * me->layout ()->get_dimension (ly_symbol2scm ("line-thickness"));
 207
 208   Real blotdiameter
 209     = (me->layout ()->get_dimension (ly_symbol2scm ("blot-diameter")));
 210
 211   int pos = Staff_symbol_referencer::get_rounded_position (me);
 212
 213   SCM delta_pitch_scm = me->get_property ("delta-position");
 214   int delta_pitch;
 215   if (delta_pitch_scm != SCM_EOL)
 216     delta_pitch = scm_to_int (delta_pitch_scm);
 217   else
 218     delta_pitch = 0;
 219
 220   Real x_offset = robust_scm2double (me->get_property ("x-offset"), 0);
 221
 222   bool add_stem = to_boolean (me->get_property ("add-stem"));
 223   bool add_cauda = to_boolean (me->get_property ("add-cauda"));
 224   bool add_join = to_boolean (me->get_property ("add-join"));
 225
 226   if (glyph_name == "")
 227     {
 228       /*
 229        * This is an empty head.  This typically applies for the right
 230        * side of a curved flexa shape, which is already typeset by the
 231        * associated left side head.  The only possible thing left to
 232        * do is to draw a vertical join to the next head.  (Urgh: need
 233        * flexa_width.)
 234        */
 235       Real staff_space = Staff_symbol_referencer::staff_space (me);
 236       Real flexa_width = robust_scm2double (me->get_property ("flexa-width"), 2) * staff_space;
 237       out
 238         = Lookup::blank (Box (Interval (0, 0.5 * flexa_width), Interval (0, 0)));
 239     }
 240   else if (glyph_name == "flexa")
 241     out = vaticana_brew_flexa (me, true, line_thickness);
 242   else
 243     {
 244       out
 245         = Font_interface::get_default_font (me)->
 246         find_by_name ("noteheads.s" + glyph_name);
 247     }
 248   out.translate_axis (x_offset, X_AXIS);
 249   Real head_width = out.extent (X_AXIS).length ();
 250
 251   if (add_cauda)
 252     {
 253       Stencil cauda
 254         = vaticana_brew_cauda (me, pos, delta_pitch,
 255                                line_thickness, blotdiameter);
 256       out.add_stencil (cauda);
 257     }
 258
 259   if (add_stem)
 260     {
 261       Stencil stem
 262         = vaticana_brew_cauda (me, pos, -1,
 263                                line_thickness, blotdiameter);
 264       stem.translate_axis (head_width - line_thickness, X_AXIS);
 265       out.add_stencil (stem);
 266     }
 267
 268   if (add_join)
 269     {
 270       Stencil join
 271         = vaticana_brew_join (me, delta_pitch, line_thickness, blotdiameter);
 272       join.translate_axis (head_width - line_thickness, X_AXIS);
 273       out.add_stencil (join);
 274     }
 275
 276   return out;
 277 }
 278
 279 MAKE_SCHEME_CALLBACK (Vaticana_ligature, brew_ligature_primitive, 1);
 280 SCM
 281 Vaticana_ligature::brew_ligature_primitive (SCM smob)
 282 {
 283   Grob *me = unsmob_grob (smob);
 284   SCM primitive = vaticana_brew_primitive (me).smobbed_copy ();
 285   return primitive;
 286 }
 287
 288 MAKE_SCHEME_CALLBACK (Vaticana_ligature, print, 1);
 289 SCM
 290 Vaticana_ligature::print (SCM)
 291 {
 292   return SCM_EOL;
 293 }
 294
 295 ADD_INTERFACE (Vaticana_ligature,
 296                "A vaticana style Gregorian ligature.",
 297
 298                /* properties */
 299                "glyph-name "
 300                "flexa-height "
 301                "flexa-width "
 302                "thickness "
 303                "add-cauda "
 304                "add-stem "
 305                "add-join "
 306                "delta-position "
 307                "x-offset "
 308                );