source file of the GNU LilyPond music typesetter
- (c) 2004--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ (c) 2004--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
#include "line-interface.hh"
#include "lookup.hh"
#include "output-def.hh"
#include "grob.hh"
+#include "font-interface.hh"
Stencil
Line_interface::make_arrow (Offset begin, Offset end,
return Lookup::round_filled_polygon (points, thick);
}
+Stencil
+Line_interface::make_trill_line (Grob *me,
+ Offset from,
+ Offset to)
+{
+ Offset dz = (to-from);
+ SCM alist_chain = Font_interface::text_font_alist_chain (me);
+ SCM style_alist = scm_list_n (scm_cons (ly_symbol2scm ("font-encoding"),
+ ly_symbol2scm ("fetaMusic")),
+ SCM_UNDEFINED);
+
+ Font_metric *fm = select_font (me->layout (),
+ scm_cons (style_alist,
+ alist_chain));
+
+ Stencil elt = fm->find_by_name ("scripts.trill_element");
+ elt.align_to (Y_AXIS, CENTER);
+ Real elt_len = elt.extent (X_AXIS).length ();
+ if (elt_len <= 0.0)
+ {
+ programming_error ("can't find scripts.trill_element");
+ return Stencil ();
+ }
+
+ Stencil line;
+ Real len = 0.0;
+ do
+ {
+ line.add_at_edge (X_AXIS, RIGHT, elt, 0);
+ len = line.extent (X_AXIS).length ();
+ }
+ while (len + elt_len < dz.length ());
+
+ line.rotate (dz.arg (), Offset (LEFT, CENTER));
+ line.translate (from);
+
+ return line;
+}
+
+
+Stencil
+Line_interface::make_zigzag_line (Grob *me,
+ Offset from,
+ Offset to)
+{
+ Offset dz = to -from;
+
+ Real thick = Staff_symbol_referencer::line_thickness (me);
+ thick *= robust_scm2double (me->get_property ("thickness"), 1.0); // todo: staff sym referencer?
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+
+ Real w = robust_scm2double (me->get_property ("zigzag-width"), 1) * staff_space;
+ int count = (int) ceil (dz.length () / w);
+ w = dz.length () / count;
+
+ Real l = robust_scm2double (me->get_property ("zigzag-length"), 1) * w;
+ Real h = l > w / 2 ? sqrt (l * l - w * w / 4) : 0;
+
+ Offset rotation_factor = complex_exp (Offset (0, dz.arg ()));
+
+ Offset points[3];
+ points[0] = Offset (0, -h / 2);
+ points[1] = Offset (w / 2, h / 2);
+ points[2] = Offset (w, -h / 2);
+ for (int i = 0; i < 3; i++)
+ points[i] = complex_multiply (points[i], rotation_factor);
+
+ Stencil squiggle (Line_interface::make_line (thick, points[0], points[1]));
+ squiggle.add_stencil (Line_interface::make_line (thick, points[1], points[2]));
+
+ Stencil total;
+ for (int i = 0; i < count; i++)
+ {
+ Stencil moved_squiggle (squiggle);
+ moved_squiggle.translate (from + Offset (i * w, 0) * rotation_factor);
+ total.add_stencil (moved_squiggle);
+ }
+
+ Box b;
+ b.add_point (Offset (0, 0));
+ b.add_point (dz);
+ b[X_AXIS].widen (thick / 2);
+ b[Y_AXIS].widen (thick / 2);
+
+ return Stencil (b, total.expr ());
+}
+
+
Stencil
Line_interface::make_dashed_line (Real thick, Offset from, Offset to,
Real dash_period, Real dash_fraction)
* robust_scm2double (me->get_property ("thickness"), 1);
SCM type = me->get_property ("style");
-
+ if (type == ly_symbol2scm ("zigzag"))
+ {
+ return make_zigzag_line (me, from, to);
+ }
+ else if (type == ly_symbol2scm ("trill"))
+ return make_trill_line (me, from, to);
+
Stencil stil;
SCM dash_fraction = me->get_property ("dash-fraction");
Real period = Staff_symbol_referencer::staff_space (me)
* robust_scm2double (me->get_property ("dash-period"), 1.0);
- if (period < 0)
+ if (period <= 0)
return Stencil ();
+ Real len = (to-from).length();
+
+ int n = (int) rint ((len - period * fraction) / period);
+ if (n > 0)
+ {
+ /*
+ TODO: figure out something intelligent for really short
+ sections.
+ */
+ period = ((to-from).length() - period * fraction) / n;
+ }
stil = make_dashed_line (thick, from, to, period, fraction);
}
else
"dash-fraction "
"thickness "
"style "
+ "zigzag-length "
+ "zigzag-width "
"arrow-length "
- "arrow-width")
+ "arrow-width ")