2 vaticana-ligature.cc -- implement Vaticana_ligature
4 source file of the GNU LilyPond music typesetter
6 (c) 2003--2005 Juergen Reuter <reuter@ipd.uka.de>
9 #include "vaticana-ligature.hh"
14 #include "font-interface.hh"
16 #include "staff-symbol-referencer.hh"
17 #include "note-head.hh"
18 #include "output-def.hh"
23 vaticana_brew_cauda (Grob *me,
29 bool on_staffline = Staff_symbol_referencer::on_staffline (me, pos);
30 int interspaces = Staff_symbol_referencer::line_count (me) - 1;
31 bool above_staff = pos > interspaces;
35 me->programming_error ("flexa cauda: invalid delta_pitch; assuming -1");
41 if (delta_pitch >= -1)
43 else if (delta_pitch >= -2)
50 if (delta_pitch >= -1)
55 else if (delta_pitch >= -2)
57 else if (delta_pitch >= -3)
62 Box cauda_box (Interval (0, thickness), Interval (-length, 0));
63 return Lookup::round_filled_box (cauda_box, blotdiameter);
67 * TODO: move this function to class Lookup?
70 vaticana_brew_flexa (Grob *me,
74 Real staff_space = Staff_symbol_referencer::staff_space (me);
76 Real right_height = 0.6 * staff_space;
79 SCM flexa_height_scm = me->get_property ("flexa-height");
80 if (flexa_height_scm != SCM_EOL)
81 interval = scm_to_int (flexa_height_scm);
84 me->warning ("Vaticana_ligature: "
85 + _ ("flexa-height undefined; assuming 0"));
90 me->warning (_ ("ascending vaticana style flexa"));
92 Real width = robust_scm2double (me->get_property ("flexa-width"), 2);
95 * Compensate curve thickness that appears to be smaller in steep
100 + min (0.12 * abs (interval), 0.3) * staff_space;
103 * Compensate optical illusion regarding vertical position of left
104 * and right endings due to curved shape.
106 Real ypos_correction = -0.1 * staff_space * sign (interval);
107 Real interval_correction = 0.2 * staff_space * sign (interval);
108 Real corrected_interval = interval * staff_space + interval_correction;
111 * middle curve of flexa shape
114 curve.control_[0] = Offset (0.00 * width, 0.0);
115 curve.control_[1] = Offset (0.33 * width, corrected_interval / 2.0);
116 curve.control_[2] = Offset (0.66 * width, corrected_interval / 2.0);
117 curve.control_[3] = Offset (1.00 * width, corrected_interval / 2.0);
119 Bezier top_curve = curve, bottom_curve = curve;
120 for (int i = 0; i < 4; i++)
122 Real curve_thickness = 0.33 * ((3 - i) * left_height + i * right_height);
123 top_curve.control_[i] += Offset (0, 0.5 * curve_thickness);
124 bottom_curve.control_[i] -= Offset (0, 0.5 * curve_thickness);
130 = Lookup::bezier_sandwich (top_curve, bottom_curve);
131 stencil.add_stencil (solid_head);
135 Bezier inner_top_curve = top_curve;
136 inner_top_curve.translate (Offset (0.0, -line_thickness));
138 = Lookup::bezier_sandwich (top_curve, inner_top_curve);
139 stencil.add_stencil (top_edge);
141 Bezier inner_bottom_curve = bottom_curve;
142 inner_bottom_curve.translate (Offset (0.0, +line_thickness));
144 = Lookup::bezier_sandwich (bottom_curve, inner_bottom_curve);
145 stencil.add_stencil (bottom_edge);
148 * TODO: Use horizontal slope with proper slope value rather
149 * than filled box for left edge, since the filled box stands
150 * out from the flexa shape if the interval is big and the line
151 * thickness small. The difficulty here is to compute a proper
152 * slope value, as it should roughly be equal with the slope of
153 * the left end of the bezier curve.
155 Box left_edge_box (Interval (0, line_thickness),
156 Interval (-0.5 * left_height, +0.5 * left_height));
157 Stencil left_edge = Lookup::filled_box (left_edge_box);
158 stencil.add_stencil (left_edge);
160 Box right_edge_box (Interval (-line_thickness, 0),
161 Interval (-0.5 * right_height, +0.5 * right_height));
162 Stencil right_edge = Lookup::filled_box (right_edge_box);
163 right_edge.translate_axis (width, X_AXIS);
164 right_edge.translate_axis (corrected_interval / 2.0, Y_AXIS);
165 stencil.add_stencil (right_edge);
167 stencil.translate_axis (ypos_correction, Y_AXIS);
172 vaticana_brew_join (Grob *me, int delta_pitch,
173 Real join_thickness, Real blotdiameter)
175 Real staff_space = Staff_symbol_referencer::staff_space (me);
178 me->programming_error (_f ("Vaticana_ligature: "
179 "zero join (delta_pitch == 0)"));
182 Interval x_extent = Interval (0, join_thickness);
183 Interval y_extent = (delta_pitch > 0)
184 ? Interval (0, delta_pitch * 0.5 * staff_space) : // ascending join
185 Interval (delta_pitch * 0.5 * staff_space, 0); // descending join
186 Box join_box (x_extent, y_extent);
187 return Lookup::round_filled_box (join_box, blotdiameter);
191 vaticana_brew_primitive (Grob *me)
193 SCM glyph_name_scm = me->get_property ("glyph-name");
194 if (glyph_name_scm == SCM_EOL)
196 me->programming_error ("Vaticana_ligature: "
197 "undefined glyph-name -> ignoring grob");
201 String glyph_name = ly_scm2string (glyph_name_scm);
204 Real thickness = robust_scm2double (me->get_property ("thickness"), 1);
207 = thickness * me->get_layout ()->get_dimension (ly_symbol2scm ("linethickness"));
210 = (me->get_layout ()->get_dimension (ly_symbol2scm ("blotdiameter")));
212 int pos = Staff_symbol_referencer::get_rounded_position (me);
214 SCM delta_pitch_scm = me->get_property ("delta-pitch");
216 if (delta_pitch_scm != SCM_EOL)
217 delta_pitch = scm_to_int (delta_pitch_scm);
221 Real x_offset = robust_scm2double (me->get_property ("x-offset"), 0);
223 bool add_stem = to_boolean (me->get_property ("add-stem"));
224 bool add_cauda = to_boolean (me->get_property ("add-cauda"));
225 bool add_join = to_boolean (me->get_property ("add-join"));
227 if (!String::compare (glyph_name, ""))
230 * This is an empty head. This typically applies for the right
231 * side of a curved flexa shape, which is already typeset by the
232 * associated left side head. The only possible thing left to
233 * do is to draw a vertical join to the next head. (Urgh: need
236 Real staff_space = Staff_symbol_referencer::staff_space (me);
237 Real flexa_width = robust_scm2double (me->get_property ("flexa-width"), 2) * staff_space;
239 = Lookup::blank (Box (Interval (0, 0.5 * flexa_width), Interval (0, 0)));
241 else if (!String::compare (glyph_name, "flexa"))
242 out = vaticana_brew_flexa (me, true, line_thickness);
246 = Font_interface::get_default_font (me)->
247 find_by_name ("noteheads." + glyph_name);
249 out.translate_axis (x_offset, X_AXIS);
250 Real head_width = out.extent (X_AXIS).length ();
255 = vaticana_brew_cauda (me, pos, delta_pitch,
256 line_thickness, blotdiameter);
257 out.add_stencil (cauda);
263 = vaticana_brew_cauda (me, pos, -1,
264 line_thickness, blotdiameter);
265 stem.translate_axis (head_width - line_thickness, X_AXIS);
266 out.add_stencil (stem);
272 = vaticana_brew_join (me, delta_pitch, line_thickness, blotdiameter);
273 join.translate_axis (head_width - line_thickness, X_AXIS);
274 out.add_stencil (join);
280 MAKE_SCHEME_CALLBACK (Vaticana_ligature, brew_ligature_primitive, 1);
282 Vaticana_ligature::brew_ligature_primitive (SCM smob)
284 Grob *me = unsmob_grob (smob);
285 SCM primitive = vaticana_brew_primitive (me).smobbed_copy ();
289 MAKE_SCHEME_CALLBACK (Vaticana_ligature, print, 1);
291 Vaticana_ligature::print (SCM)
296 ADD_INTERFACE (Vaticana_ligature, "vaticana-ligature-interface",
297 "A vaticana style gregorian ligature",
298 "glyph-name flexa-height flexa-width thickness add-cauda "
299 "add-stem add-join delta-pitch x-offset "
300 "ligature-primitive-callback");