source file of the GNU LilyPond music typesetter
- (c) 2004--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ (c) 2004--2008 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);
+ }
+
+ return total;
+}
+
+
Stencil
Line_interface::make_dashed_line (Real thick, Offset from, Offset to,
Real dash_period, Real dash_fraction)
{
dash_fraction = min (max (dash_fraction, 0.0), 1.0);
Real on = dash_fraction * dash_period + thick;
- Real off = dash_period - on;
+ Real off = max (0.0, dash_period - on);
SCM at = scm_list_n (ly_symbol2scm ("dashed-line"),
scm_from_double (thick),
* 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 stencil;
- Stencil stil;
-
- SCM dash_fraction = me->get_property ("dash-fraction");
- if (scm_is_number (dash_fraction) || type == ly_symbol2scm ("dotted-line"))
+ if (type == ly_symbol2scm ("dashed-line") || type == ly_symbol2scm ("dotted-line"))
{
Real fraction
= type == ly_symbol2scm ("dotted-line")
? 0.0
- : robust_scm2double (dash_fraction, 0.4);
+ : robust_scm2double (me->get_property ("dash-fraction"), 0.4);
fraction = min (max (fraction, 0.0), 1.0);
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 ();
- stil = make_dashed_line (thick, from, to, period, fraction);
+ Real len = (to-from).length ();
+
+ int n = (int) rint ((len - period * fraction) / period);
+ n = max (0, n);
+ if (n > 0)
+ {
+ /*
+ TODO: figure out something intelligent for really short
+ sections.
+ */
+ period = ((to-from).length () - period * fraction) / n;
+ }
+ stencil = make_dashed_line (thick, from, to, period, fraction);
}
else
- stil = make_line (thick, from, to);
+ stencil = make_line (thick, from, to);
- return stil;
+ return stencil;
}
ADD_INTERFACE (Line_interface,
- "Generic line objects. Any object using lines supports this. Normally, "
- "you get a straight line. If @code{dash-period} is defined, a dashed line is "
- "produced; the length of the dashes is tuned with "
- "@code{dash-fraction}. If the latter is set to 0, a dotted line is "
- "produced. If @code{dash-fraction} is negative, the line is made "
- "transparent.",
+ "Generic line objects. Any object using lines supports this."
+ " The property @code{style} can be @code{line},"
+ " @code{dashed-line}, @code{trill}, @code{dotted-line} or"
+ " @code{zigzag}.\n"
+ "\n"
+ "For @code{dashed-line}, the length of the dashes is tuned"
+ " with @code{dash-fraction}. If the latter is set to@tie{}0, a"
+ " dotted line is produced. If @code{dash-period} is negative,"
+ " the line is made transparent.",
/* properties */
"dash-period "
"dash-fraction "
"thickness "
"style "
+ "zigzag-length "
+ "zigzag-width "
"arrow-length "
"arrow-width ")
projects / lilypond.git / blobdiff