/*
- line-interface.cc -- implement Line_interface
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 2004--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 2004--2006 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ LilyPond is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ LilyPond is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
*/
#include "line-interface.hh"
-#include "staff-symbol-referencer.hh"
+#include "font-interface.hh"
+#include "grob.hh"
#include "lookup.hh"
#include "output-def.hh"
-#include "grob.hh"
+#include "staff-symbol-referencer.hh"
Stencil
Line_interface::make_arrow (Offset begin, Offset end,
- Real thick,
- Real length, Real width)
+ Real thick,
+ Real length, Real width)
{
Real angle = (end - begin).arg ();
vector<Offset> points;
return Lookup::round_filled_polygon (points, thick);
}
+Stencil
+Line_interface::make_trill_line (Grob *me,
+ Offset from,
+ Offset to)
+{
+ Offset dz = (to - from);
+
+ Font_metric *fm = Font_interface::get_default_font (me);
+
+ 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)
+ 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),
- scm_from_double (on),
- scm_from_double (off),
- scm_from_double (to[X_AXIS] - from[X_AXIS]),
- scm_from_double (to[Y_AXIS] - from[Y_AXIS]),
- scm_from_double (0.0),
- SCM_UNDEFINED);
+ scm_from_double (thick),
+ scm_from_double (on),
+ scm_from_double (off),
+ scm_from_double (to[X_AXIS] - from[X_AXIS]),
+ scm_from_double (to[Y_AXIS] - from[Y_AXIS]),
+ scm_from_double (0.0),
+ SCM_UNDEFINED);
Box box;
box.add_point (Offset (0, 0));
Line_interface::make_line (Real th, Offset from, Offset to)
{
SCM at = scm_list_n (ly_symbol2scm ("draw-line"),
- scm_from_double (th),
- scm_from_double (from[X_AXIS]),
- scm_from_double (from[Y_AXIS]),
- scm_from_double (to[X_AXIS]),
- scm_from_double (to[Y_AXIS]),
- SCM_UNDEFINED);
+ scm_from_double (th),
+ scm_from_double (from[X_AXIS]),
+ scm_from_double (from[Y_AXIS]),
+ scm_from_double (to[X_AXIS]),
+ scm_from_double (to[Y_AXIS]),
+ SCM_UNDEFINED);
Box box;
box.add_point (from);
Stencil
Line_interface::arrows (Grob *me, Offset from, Offset to,
- bool from_arrow,
- bool to_arrow)
+ bool from_arrow,
+ bool to_arrow)
{
Stencil a;
if (from_arrow || to_arrow)
{
Real thick = Staff_symbol_referencer::line_thickness (me)
- * robust_scm2double (me->get_property ("thickness"), 1);
+ * robust_scm2double (me->get_property ("thickness"), 1);
Real ss = Staff_symbol_referencer::staff_space (me);
Real len = robust_scm2double (me->get_property ("arrow-length"), 1.3 * ss);
Real wid = robust_scm2double (me->get_property ("arrow-width"), 0.5 * ss);
if (to_arrow)
- a.add_stencil (make_arrow (from, to, thick, len, wid));
+ a.add_stencil (make_arrow (from, to, thick, len, wid));
if (from_arrow)
- a.add_stencil (make_arrow (to, from, thick, len, wid));
+ a.add_stencil (make_arrow (to, from, thick, len, wid));
}
return a;
Line_interface::line (Grob *me, Offset from, Offset to)
{
Real thick = Staff_symbol_referencer::line_thickness (me)
- * robust_scm2double (me->get_property ("thickness"), 1);
+ * 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);
+ else if (type == ly_symbol2scm ("none"))
+ return Stencil ();
- Stencil stil;
+ Stencil stencil;
- 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);
+ = type == ly_symbol2scm ("dotted-line")
+ ? 0.0
+ : 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)
- return Stencil ();
-
- stil = make_dashed_line (thick, from, to, period, fraction);
+ * robust_scm2double (me->get_property ("dash-period"), 1.0);
+
+ if (period <= 0)
+ return Stencil ();
+
+ 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.",
-
- /* properties */
- "dash-period "
- "dash-fraction "
- "thickness "
- "style "
- "arrow-length "
- "arrow-width")
-
+ "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},"
+ " @code{zigzag} or @code{none} (a transparent line).\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.",
+
+ /* properties */
+ "arrow-length "
+ "arrow-width "
+ "dash-fraction "
+ "dash-period "
+ "style "
+ "thickness "
+ "zigzag-length "
+ "zigzag-width "
+ );
projects / lilypond.git / blobdiff