/*
- lookup.cc -- implement simple Lookup methods.
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
-
- (c) 1997--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
+ Copyright (C) 1997--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
+
+ 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 "lookup.hh"
Lookup::dot (Offset p, Real radius)
{
SCM at = (scm_list_n (ly_symbol2scm ("dot"),
- scm_from_double (p[X_AXIS]),
- scm_from_double (p[Y_AXIS]),
- scm_from_double (radius),
- SCM_UNDEFINED));
+ scm_from_double (p[X_AXIS]),
+ scm_from_double (p[Y_AXIS]),
+ scm_from_double (radius),
+ SCM_UNDEFINED));
Box box;
box.add_point (p - Offset (radius, radius));
box.add_point (p + Offset (radius, radius));
SCM points = SCM_EOL;
points = scm_cons (scm_from_double (p[X_AXIS]),
- scm_cons (scm_from_double (p[Y_AXIS]),
- points));
+ scm_cons (scm_from_double (p[Y_AXIS]),
+ points));
p = Offset (0, -thick / 2);
b.add_point (p);
p += Offset (1, 1) * (blot / 2);
points = scm_cons (scm_from_double (p[X_AXIS]),
- scm_cons (scm_from_double (p[Y_AXIS]),
- points));
+ scm_cons (scm_from_double (p[Y_AXIS]),
+ points));
p = Offset (width, width * slope - thick / 2);
b.add_point (p);
p += Offset (-1, 1) * (blot / 2);
points = scm_cons (scm_from_double (p[X_AXIS]),
- scm_cons (scm_from_double (p[Y_AXIS]),
- points));
+ scm_cons (scm_from_double (p[Y_AXIS]),
+ points));
p = Offset (width, width * slope + thick / 2);
b.add_point (p);
p += Offset (-1, -1) * (blot / 2);
points = scm_cons (scm_from_double (p[X_AXIS]),
- scm_cons (scm_from_double (p[Y_AXIS]),
- points));
+ scm_cons (scm_from_double (p[Y_AXIS]),
+ points));
SCM expr = scm_list_n (ly_symbol2scm ("polygon"),
- ly_quote_scm (points),
- scm_from_double (blot),
- SCM_BOOL_T,
- SCM_UNDEFINED);
+ ly_quote_scm (points),
+ scm_from_double (blot),
+ SCM_BOOL_T,
+ SCM_UNDEFINED);
return Stencil (b, expr);
}
-Stencil
-Lookup::dashed_slur (Bezier b, Real thick, Real dash_period, Real dash_fraction)
-{
- SCM l = SCM_EOL;
-
- Real on = dash_fraction * dash_period;
- Real off = dash_period - on;
-
- for (int i = 4; i--;)
- l = scm_cons (ly_offset2scm (b.control_[i]), l);
-
- SCM at = (scm_list_n (ly_symbol2scm ("dashed-slur"),
- scm_from_double (thick),
- scm_from_double (on),
- scm_from_double (off),
- ly_quote_scm (l),
- SCM_UNDEFINED));
-
- Box box (b.extent (X_AXIS), b.extent (Y_AXIS));
- return Stencil (box, at);
-}
-
Stencil
Lookup::rotated_box (Real slope, Real width, Real thick, Real blot)
{
vector<Offset> pts;
Offset rot (1, slope);
- thick -= 2*blot;
- width -= 2*blot;
- rot /= sqrt (1 + slope*slope);
+ thick -= 2 * blot;
+ width -= 2 * blot;
+ rot /= sqrt (1 + slope * slope);
pts.push_back (Offset (0, -thick / 2) * rot);
pts.push_back (Offset (width, -thick / 2) * rot);
pts.push_back (Offset (width, thick / 2) * rot);
Lookup::horizontal_line (Interval w, Real th)
{
SCM at = scm_list_n (ly_symbol2scm ("draw-line"),
- scm_from_double (th),
- scm_from_double (w[LEFT]),
- scm_from_double (0),
- scm_from_double (w[RIGHT]),
- scm_from_double (0),
- SCM_UNDEFINED);
+ scm_from_double (th),
+ scm_from_double (w[LEFT]),
+ scm_from_double (0),
+ scm_from_double (w[RIGHT]),
+ scm_from_double (0),
+ SCM_UNDEFINED);
Box box;
box[X_AXIS] = w;
blotdiameter = b.y ().length ();
SCM at = (scm_list_n (ly_symbol2scm ("round-filled-box"),
- scm_from_double (-b[X_AXIS][LEFT]),
- scm_from_double (b[X_AXIS][RIGHT]),
- scm_from_double (-b[Y_AXIS][DOWN]),
- scm_from_double (b[Y_AXIS][UP]),
- scm_from_double (blotdiameter),
- SCM_UNDEFINED));
+ scm_from_double (-b[X_AXIS][LEFT]),
+ scm_from_double (b[X_AXIS][RIGHT]),
+ scm_from_double (-b[Y_AXIS][DOWN]),
+ scm_from_double (b[Y_AXIS][UP]),
+ scm_from_double (blotdiameter),
+ SCM_UNDEFINED));
return Stencil (b, at);
}
*/
Stencil
Lookup::round_filled_polygon (vector<Offset> const &points,
- Real blotdiameter)
+ Real blotdiameter)
{
/* TODO: Maybe print a warning if one of the above limitations
applies to the given polygon. However, this is quite complicated
int next = (i + 1) % points.size ();
Real d = (points[i] - points[next]).length ();
if (d < epsilon)
- programming_error ("Polygon should not have duplicate points");
+ programming_error ("Polygon should not have duplicate points");
}
#endif
Offset p10 = p0 - p1;
Offset p12 = p2 - p1;
if (p10.length () != 0.0)
- { // recompute ccw
- Real phi = p10.arg ();
- // rotate (p2 - p0) by (-phi)
- Offset q = complex_multiply (p2 - p0, complex_exp (Offset (1.0, -phi)));
-
- if (q[Y_AXIS] > 0)
- ccw = 1;
- else if (q[Y_AXIS] < 0)
- ccw = 0;
- else {} // keep ccw unchanged
- }
+ {
+ // recompute ccw
+ Real phi = p10.arg ();
+ // rotate (p2 - p0) by (-phi)
+ Offset q = complex_multiply (p2 - p0, complex_exp (Offset (1.0, -phi)));
+
+ if (q[Y_AXIS] > 0)
+ ccw = 1;
+ else if (q[Y_AXIS] < 0)
+ ccw = 0;
+ else {} // keep ccw unchanged
+ }
else {} // keep ccw unchanged
Offset p10n = (1.0 / p10.length ()) * p10; // normalize length to 1.0
Offset p12n = (1.0 / p12.length ()) * p12;
Offset p13;
Real d = p13n.length () * p14n.length (); // distance p3n to line (p1..p0)
if (d < epsilon)
- // special case: p0, p1, p2 are on a single line => build
- // vector orthogonal to (p2-p0) of length 0.5 blotdiameter
- {
- p13[X_AXIS] = p10[Y_AXIS];
- p13[Y_AXIS] = -p10[X_AXIS];
- p13 = (0.5 * blotdiameter / p13.length ()) * p13;
- }
+ // special case: p0, p1, p2 are on a single line => build
+ // vector orthogonal to (p2-p0) of length 0.5 blotdiameter
+ {
+ p13[X_AXIS] = p10[Y_AXIS];
+ p13[Y_AXIS] = -p10[X_AXIS];
+ p13 = (0.5 * blotdiameter / p13.length ()) * p13;
+ }
else
- p13 = (0.5 * blotdiameter / d) * p13n;
+ p13 = (0.5 * blotdiameter / d) * p13n;
shrunk_points[i1] = p1 + ((ccw) ? p13 : -p13);
}
box.add_point (points[i]);
}
SCM polygon_scm = scm_list_n (ly_symbol2scm ("polygon"),
- ly_quote_scm (shrunk_points_scm),
- scm_from_double (blotdiameter),
- SCM_BOOL_T,
- SCM_UNDEFINED);
+ ly_quote_scm (shrunk_points_scm),
+ scm_from_double (blotdiameter),
+ SCM_BOOL_T,
+ SCM_UNDEFINED);
Stencil polygon = Stencil (box, polygon_scm);
shrunk_points.clear ();
Direction d = LEFT;
for (Axis a = X_AXIS; a < NO_AXES; a = Axis (a + 1))
{
- Axis o = Axis ((a + 1)%NO_AXES);
+ Axis o = Axis ((a + 1) % NO_AXES);
do
- {
- Box edges;
- edges[a] = b[a][d] + 0.5 * thick * Interval (-1, 1);
- edges[o][DOWN] = b[o][DOWN] - thick / 2;
- edges[o][UP] = b[o][UP] + thick / 2;
-
- m.add_stencil (round_filled_box (edges, blot));
- }
+ {
+ Box edges;
+ edges[a] = b[a][d] + 0.5 * thick * Interval (-1, 1);
+ edges[o][DOWN] = b[o][DOWN] - thick / 2;
+ edges[o][UP] = b[o][UP] + thick / 2;
+
+ m.add_stencil (round_filled_box (edges, blot));
+ }
while (flip (&d) != LEFT);
}
return m;
Make a smooth curve along the points
*/
Stencil
-Lookup::slur (Bezier curve, Real curvethick, Real linethick)
+Lookup::slur (Bezier curve, Real curvethick, Real linethick,
+ SCM dash_details)
{
+ Stencil return_value;
+
+ /*
+ calculate the offset for the two beziers that make the sandwich
+ for the slur
+ */
Real alpha = (curve.control_[3] - curve.control_[0]).arg ();
Bezier back = curve;
Offset perp = curvethick * complex_exp (Offset (0, alpha + M_PI / 2)) * 0.5;
- back.reverse ();
back.control_[1] += perp;
back.control_[2] += perp;
curve.control_[1] -= perp;
curve.control_[2] -= perp;
- SCM scontrols[8];
-
- for (int i = 0; i < 4; i++)
- scontrols[i] = ly_offset2scm (back.control_[i]);
- for (int i = 0; i < 4; i++)
- scontrols[i + 4] = ly_offset2scm (curve.control_[i]);
-
- /*
- Need the weird order b.o. the way PS want its arguments
- */
- int indices[] = {5, 6, 7, 4, 1, 2, 3, 0};
- SCM list = SCM_EOL;
- for (int i = 8; i--;)
- list = scm_cons (scontrols[indices[i]], list);
-
- SCM at = (scm_list_n (ly_symbol2scm ("bezier-sandwich"),
- ly_quote_scm (list),
- scm_from_double (linethick),
- SCM_UNDEFINED));
- Box b (curve.extent (X_AXIS),
- curve.extent (Y_AXIS));
-
- b[X_AXIS].unite (back.extent (X_AXIS));
- b[Y_AXIS].unite (back.extent (Y_AXIS));
-
- b.widen (0.5 * linethick, 0.5 * linethick);
- return Stencil (b, at);
+ if (!scm_is_pair (dash_details))
+ {
+ /* solid slur */
+ return_value = bezier_sandwich (back, curve, linethick);
+ }
+ else
+ {
+ /* dashed or combination slur */
+ int num_segments = scm_to_int (scm_length (dash_details));
+ for (int i = 0; i < num_segments; i++)
+ {
+ SCM dash_pattern = scm_list_ref (dash_details, scm_from_int (i));
+ Real t_min = robust_scm2double (scm_car (dash_pattern), 0);
+ Real t_max = robust_scm2double (scm_cadr (dash_pattern), 1.0);
+ Real dash_fraction
+ = robust_scm2double (scm_caddr (dash_pattern), 1.0);
+ Real dash_period
+ = robust_scm2double (scm_cadddr (dash_pattern), 0.75);
+ Bezier back_segment = back.extract (t_min, t_max);
+ Bezier curve_segment = curve.extract (t_min, t_max);
+ if (dash_fraction == 1.0)
+ return_value.add_stencil (bezier_sandwich (back_segment,
+ curve_segment,
+ linethick));
+ else
+ {
+ Bezier back_dash, curve_dash;
+ Real seg_length = (back_segment.control_[3]
+ - back_segment.control_[0]).length ();
+ int pattern_count = (int) (seg_length / dash_period);
+ Real pattern_length = 1.0 / (pattern_count + dash_fraction);
+ Real start_t, end_t;
+ for (int p = 0; p <= pattern_count; p++)
+ {
+ start_t = p * pattern_length;
+ end_t = (p + dash_fraction) * pattern_length;
+ back_dash
+ = back_segment.extract (start_t, end_t);
+ curve_dash
+ = curve_segment.extract (start_t, end_t);
+ return_value.add_stencil (bezier_sandwich (back_dash,
+ curve_dash,
+ linethick));
+ }
+ }
+ }
+ }
+ return return_value;
}
/*
*
*/
Stencil
-Lookup::bezier_sandwich (Bezier top_curve, Bezier bottom_curve)
+Lookup::bezier_sandwich (Bezier top_curve, Bezier bottom_curve, Real thickness)
{
/*
Need the weird order b.o. the way PS want its arguments
list = scm_cons (ly_offset2scm (top_curve.control_[1]), list);
SCM horizontal_bend = scm_list_n (ly_symbol2scm ("bezier-sandwich"),
- ly_quote_scm (list),
- scm_from_double (0.0),
- SCM_UNDEFINED);
+ ly_quote_scm (list),
+ scm_from_double (thickness),
+ SCM_UNDEFINED);
Interval x_extent = top_curve.extent (X_AXIS);
x_extent.unite (bottom_curve.extent (X_AXIS));
y_extent.unite (bottom_curve.extent (Y_AXIS));
Box b (x_extent, y_extent);
+ b.widen (0.5 * thickness, 0.5 * thickness);
return Stencil (b, horizontal_bend);
}
SCM sl = scm_from_double (s);
SCM thick = scm_from_double (t);
SCM slashnodot = scm_list_n (ly_symbol2scm ("repeat-slash"),
- wid, sl, thick, SCM_UNDEFINED);
+ wid, sl, thick, SCM_UNDEFINED);
Box b (Interval (0, w + sqrt (sqr (t / s) + sqr (t))),
- Interval (0, w * s));
+ Interval (0, w * s));
return Stencil (b, slashnodot); // http://slashnodot.org
}
Lookup::bracket (Axis a, Interval iv, Real thick, Real protrude, Real blot)
{
Box b;
- Axis other = Axis ((a + 1)%2);
+ Axis other = Axis ((a + 1) % 2);
b[a] = iv;
b[other] = Interval (-1, 1) * thick * 0.5;
points.push_back (Offset (iv[LEFT], 0));
points.push_back (Offset (iv[RIGHT], 0));
points.push_back (Offset (iv.center (), protrude));
+ points.push_back (Offset (iv[LEFT], 0)); // close triangle
return points_to_line_stencil (thick, points);
}
-
-
Stencil
Lookup::points_to_line_stencil (Real thick, vector<Offset> const &points)
{
Stencil ret;
for (vsize i = 1; i < points.size (); i++)
{
- if (points[i-1].is_sane () && points[i].is_sane ())
- {
- Stencil line
- = Line_interface::make_line (thick, points[i-1], points[i]);
- ret.add_stencil (line);
- }
+ if (points[i - 1].is_sane () && points[i].is_sane ())
+ {
+ Stencil line
+ = Line_interface::make_line (thick, points[i - 1], points[i]);
+ ret.add_stencil (line);
+ }
}
return ret;
}