/*
- stencil-scheme.cc -- implement Stencil
+ This file is part of LilyPond, the GNU music typesetter.
- source file of the GNU LilyPond music typesetter
+ Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
- (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.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 "stencil.hh"
#include "font-metric.hh"
+#include "libc-extension.hh"
+#include "lookup.hh"
+#include "offset.hh"
+#include "stencil.hh"
+
+/*
+ * A few general helpers in degrees
+ */
-LY_DEFINE(ly_stencil_set_extent_x,"ly:stencil-set-extent!", 3 , 0, 0,
- (SCM mol, SCM axis, SCM np),
- "Set the extent (@var{extent} must be a pair of numbers) of @var{mol} in \n"
- "@var{axis} direction (0 or 1 for x- and y-axis respectively).\n"
- )
+LY_DEFINE (ly_angle, "ly:angle",
+ 1, 1, 0, (SCM x, SCM y),
+ "Calculates angle in degrees of given vector. With one argument,"
+ " @var{x} is a number pair indicating the vector. With two"
+ " arguments, @var{x} and @var{y} specify the respective coordinates.")
{
- Stencil* m = unsmob_stencil (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "stencil");
- SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE (is_number_pair (np), np, SCM_ARG3, __FUNCTION__, "number pair");
+ Offset off;
+ if (SCM_UNBNDP (y)) {
+ LY_ASSERT_TYPE (is_number_pair, x, 1);
+ off = ly_scm2offset (x);
+ } else {
+ LY_ASSERT_TYPE (scm_is_number, x, 1);
+ LY_ASSERT_TYPE (scm_is_number, y, 2);
+ off = Offset (scm_to_double (x), scm_to_double (y));
+ }
+ return scm_from_double (off.angle_degrees ());
+}
- Interval iv = ly_scm2interval (np);
- m->dim_[Axis (gh_scm2int (axis))] = iv;
+LY_DEFINE (ly_length, "ly:length",
+ 1, 1, 0, (SCM x, SCM y),
+ "Calculates magnitude of given vector. With one argument,"
+ " @var{x} is a number pair indicating the vector. With two"
+ " arguments, @var{x} and @var{y} specify the respective coordinates.")
+{
+ Offset off;
+ if (SCM_UNBNDP (y)) {
+ LY_ASSERT_TYPE (is_number_pair, x, 1);
+ off = ly_scm2offset (x);
+ } else {
+ LY_ASSERT_TYPE (scm_is_number, x, 1);
+ LY_ASSERT_TYPE (scm_is_number, y, 2);
+ off = Offset (scm_to_double (x), scm_to_double (y));
+ }
+ return scm_from_double (off.length ());
+}
- return SCM_UNDEFINED;
+LY_DEFINE (ly_directed, "ly:directed",
+ 1, 1, 0, (SCM direction, SCM magnitude),
+ "Calculates an @code{(x . y)} pair with optional @var{magnitude}"
+ " (defaulting to @code{1.0}) and @var{direction} specified either"
+ " as an angle in degrees or a coordinate pair giving the direction. "
+ " If @var{magnitude} is a pair, the respective coordinates are"
+ " scaled independently, useful for ellipse drawings.")
+{
+ Offset res;
+ if (scm_is_pair (direction))
+ {
+ LY_ASSERT_TYPE (is_number_pair, direction, 1);
+ res = ly_scm2offset (direction).direction ();
+ }
+ else
+ {
+ LY_ASSERT_TYPE (scm_is_number, direction, 1);
+ res = offset_directed (scm_to_double (direction));
+ }
+ if (SCM_UNBNDP (magnitude))
+ return ly_offset2scm (res);
+ if (scm_is_pair (magnitude))
+ {
+ LY_ASSERT_TYPE (is_number_pair, magnitude, 2);
+ return ly_offset2scm (res.scale (ly_scm2offset (magnitude)));
+ }
+ LY_ASSERT_TYPE (scm_is_number, magnitude, 2);
+ return ly_offset2scm (scm_to_double (magnitude) * res);
}
-LY_DEFINE(ly_translate_stencil_axis,"ly:stencil-translate-axis", 3, 0, 0,
- (SCM mol, SCM amount, SCM axis),
- "Return a @var{mol}, but translated by @var{amount} in @var{axis} direction")
+/*
+ TODO: naming add/combine.
+*/
+
+LY_DEFINE (ly_stencil_translate_axis, "ly:stencil-translate-axis",
+ 3, 0, 0, (SCM stil, SCM amount, SCM axis),
+ "Return a copy of @var{stil} but translated by @var{amount}"
+ " in @var{axis} direction.")
{
- Stencil* m = unsmob_stencil (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "stencil");
- SCM_ASSERT_TYPE (gh_number_p (amount), amount, SCM_ARG2, __FUNCTION__, "number pair");
- SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
+ Stencil *s = unsmob<Stencil> (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ LY_ASSERT_TYPE (scm_is_number, amount, 2);
+ LY_ASSERT_TYPE (is_axis, axis, 3);
- Stencil q (*m);
- q.translate_axis (gh_scm2double (amount), Axis (gh_scm2int (axis)));
+ Real real_amount = scm_to_double (amount);
- return q.smobbed_copy();
+ SCM new_s = s->smobbed_copy ();
+ scm_remember_upto_here_1 (stil);
+
+ Stencil *q = unsmob<Stencil> (new_s);
+ q->translate_axis (real_amount, Axis (scm_to_int (axis)));
+ return new_s;
}
-LY_DEFINE(ly_translate_stencil,"ly:stencil-translate", 2, 0, 0,
- (SCM mol, SCM offset),
- "Return a @var{mol}, but translated by @var{offset} (a pair of numbers).")
+LY_DEFINE (ly_stencil_translate, "ly:stencil-translate",
+ 2, 0, 0, (SCM stil, SCM offset),
+ "Return a @var{stil}, but translated by @var{offset}"
+ " (a pair of numbers).")
{
- Stencil* m = unsmob_stencil (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "stencil");
- SCM_ASSERT_TYPE (is_number_pair (offset), offset, SCM_ARG2, __FUNCTION__, "number pair");
+ Stencil *s = unsmob<Stencil> (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ LY_ASSERT_TYPE (is_number_pair, offset, 2);
Offset o = ly_scm2offset (offset);
-
- Stencil q (*m);
- q.translate (o);
- return q.smobbed_copy();
-}
-
-LY_DEFINE(ly_stencil_get_extent,
- "ly:stencil-get-extent", 2 , 0, 0, (SCM mol, SCM axis),
- "Return a pair of numbers signifying the extent of @var{mol} in "
-"@var{axis} direction (0 or 1 for x and y axis respectively)."
-)
-{
- Stencil *m = unsmob_stencil (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "stencil");
- SCM_ASSERT_TYPE (is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
-
- return ly_interval2scm (m->extent (Axis (gh_scm2int (axis))));
-}
-
-
-LY_DEFINE(ly_stencil_combined_at_edge,
- "ly:stencil-combine-at-edge",
- 4, 2, 0, (SCM first, SCM axis, SCM direction,
- SCM second,
- SCM padding,
- SCM minimum),
- "Construct a stencil by putting @var{second} next to "
-"@var{first}. @var{axis} can be 0 (x-axis) or 1 (y-axis), @var{direction} can be "
-"-1 (left or down) or 1 (right or up). "
-"The stencils are juxtaposed with @var{padding} as extra space. If "
-"this puts the reference points closer than @var{minimum}, they are moved "
-"by the latter amount.")
-
-{
- Stencil * m1 = unsmob_stencil (first);
- Stencil * m2 = unsmob_stencil (second);
+
+ SCM new_s = s->smobbed_copy ();
+ scm_remember_upto_here_1 (stil);
+
+ Stencil *q = unsmob<Stencil> (new_s);
+ q->translate (o);
+ return new_s;
+}
+
+LY_DEFINE (ly_stencil_expr, "ly:stencil-expr",
+ 1, 0, 0, (SCM stil),
+ "Return the expression of @var{stil}.")
+{
+ Stencil *s = unsmob<Stencil> (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ return s->expr ();
+}
+
+LY_DEFINE (ly_stencil_extent, "ly:stencil-extent",
+ 2, 0, 0, (SCM stil, SCM axis),
+ "Return a pair of numbers signifying the extent of @var{stil} in"
+ " @var{axis} direction (@code{0} or @code{1} for x and"
+ " y@tie{}axis, respectively).")
+{
+ Stencil *s = unsmob<Stencil> (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ LY_ASSERT_TYPE (is_axis, axis, 2);
+
+ return ly_interval2scm (s->extent (Axis (scm_to_int (axis))));
+}
+
+LY_DEFINE (ly_stencil_empty_p, "ly:stencil-empty?",
+ 1, 1, 0, (SCM stil, SCM axis),
+ "Return whether @var{stil} is empty. If an optional"
+ " @var{axis} is supplied, the emptiness check is"
+ " restricted to that axis.")
+{
+ Stencil *s = unsmob<Stencil> (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ if (SCM_UNBNDP (axis))
+ return scm_from_bool (s->is_empty ());
+ LY_ASSERT_TYPE (is_axis, axis, 2);
+ return scm_from_bool (s->is_empty (Axis (scm_to_int (axis))));
+}
+
+LY_DEFINE (ly_stencil_combine_at_edge, "ly:stencil-combine-at-edge",
+ 4, 1, 0, (SCM first, SCM axis, SCM direction,
+ SCM second,
+ SCM padding),
+ "Construct a stencil by putting @var{second} next to @var{first}."
+ " @var{axis} can be 0 (x-axis) or@tie{}1 (y-axis)."
+ " @var{direction} can be -1 (left or down) or@tie{}1 (right or"
+ " up). The stencils are juxtaposed with @var{padding} as extra"
+ " space. @var{first} and @var{second} may also be @code{'()} or"
+ " @code{#f}.")
+{
+ Stencil *s1 = unsmob<Stencil> (first);
+ Stencil *s2 = unsmob<Stencil> (second);
Stencil result;
+ SCM_ASSERT_TYPE (s1 || scm_is_false (first) || scm_is_null (first),
+ first, SCM_ARG1, __FUNCTION__, "Stencil, #f or ()");
+ SCM_ASSERT_TYPE (s2 || scm_is_false (second) || scm_is_null (second),
+ second, SCM_ARG4, __FUNCTION__, "Stencil, #f or ()");
+ LY_ASSERT_TYPE (is_axis, axis, 2);
+ LY_ASSERT_TYPE (is_direction, direction, 3);
+
+ Real p = 0.0;
+ if (!SCM_UNBNDP (padding))
+ {
+ LY_ASSERT_TYPE (scm_is_number, padding, 5);
+ p = scm_to_double (padding);
+ }
- SCM_ASSERT_TYPE(is_axis (axis), axis, SCM_ARG3, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE(is_direction (direction), direction, SCM_ARG4, __FUNCTION__, "dir");
+ if (s1)
+ result = *s1;
+
+ if (s2)
+ result.add_at_edge (Axis (scm_to_int (axis)),
+ Direction (scm_to_int (direction)), *s2, p);
+
+ scm_remember_upto_here_2 (first, second);
+
+ return result.smobbed_copy ();
+}
+
+LY_DEFINE (ly_stencil_stack, "ly:stencil-stack",
+ 4, 2, 0, (SCM first, SCM axis, SCM direction,
+ SCM second,
+ SCM padding,
+ SCM mindist),
+ "Construct a stencil by stacking @var{second} next to @var{first}."
+ " @var{axis} can be 0 (x-axis) or@tie{}1 (y-axis)."
+ " @var{direction} can be -1 (left or down) or@tie{}1 (right or"
+ " up). The stencils are juxtaposed with @var{padding} as extra"
+ " space. @var{first} and @var{second} may also be @code{'()} or"
+ " @code{#f}. As opposed to @code{ly:stencil-combine-at-edge},"
+ " metrics are suited for successively accumulating lines of"
+ " stencils. Also, @var{second} stencil is drawn last.\n\n"
+ "If @var{mindist} is specified, reference points are placed"
+ " apart at least by this distance. If either of the stencils"
+ " is spacing, @var{padding} and @var{mindist} do not apply.")
+{
+ Stencil *s1 = unsmob<Stencil> (first);
+ Stencil *s2 = unsmob<Stencil> (second);
+ Stencil result;
+
+ SCM_ASSERT_TYPE (s1 || scm_is_false (first) || scm_is_null (first),
+ first, SCM_ARG1, __FUNCTION__, "Stencil, #f or ()");
+ SCM_ASSERT_TYPE (s2 || scm_is_false (second) || scm_is_null (second),
+ second, SCM_ARG4, __FUNCTION__, "Stencil, #f or ()");
+ LY_ASSERT_TYPE (is_axis, axis, 2);
+ LY_ASSERT_TYPE (is_direction, direction, 3);
Real p = 0.0;
- if (padding != SCM_UNDEFINED)
+ if (!SCM_UNBNDP (padding))
{
- SCM_ASSERT_TYPE(gh_number_p (padding), padding, SCM_ARG5, __FUNCTION__, "number");
- p = gh_scm2double (padding);
+ LY_ASSERT_TYPE (scm_is_number, padding, 5);
+ p = scm_to_double (padding);
}
- Real m =0.0;
- if (minimum != SCM_UNDEFINED)
+ Real d = -infinity_f;
+ if (!SCM_UNBNDP (mindist))
{
- SCM_ASSERT_TYPE(gh_number_p (minimum), minimum, SCM_ARG6, __FUNCTION__, "number");
- m = gh_scm2double (minimum);
+ LY_ASSERT_TYPE (scm_is_number, mindist, 6);
+ d = scm_to_double (mindist);
}
-
- if (m1)
- result = *m1;
- if (m2)
- result.add_at_edge (Axis (gh_scm2int (axis)), Direction (gh_scm2int (direction)),
- *m2, p, m);
+
+ if (s1)
+ result = *s1;
+
+ if (s2)
+ result.stack (Axis (scm_to_int (axis)),
+ Direction (scm_to_int (direction)), *s2, p, d);
+
+ scm_remember_upto_here_2 (first, second);
return result.smobbed_copy ();
}
-/*
- FIXME: support variable number of arguments.
-
- */
-LY_DEFINE(ly_stencil_add ,
- "ly:stencil-add", 0, 0, 1, (SCM args),
- "Combine stencils. Takes any number of arguments."
- )
+LY_DEFINE (ly_stencil_add, "ly:stencil-add",
+ 0, 0, 1, (SCM args),
+ "Combine stencils. Takes any number of arguments.")
{
#define FUNC_NAME __FUNCTION__
SCM_VALIDATE_REST_ARGUMENT (args);
- Stencil result;
+ SCM expr = SCM_EOL;
+ SCM cs = ly_symbol2scm ("combine-stencil");
+
+ Box extent;
+ extent.set_empty ();
while (!SCM_NULLP (args))
{
- Stencil * m = unsmob_stencil (gh_car (args));
+ Stencil *s = unsmob<Stencil> (scm_car (args));
+ if (!s)
+ SCM_ASSERT_TYPE (s, scm_car (args), SCM_ARGn, __FUNCTION__, "Stencil");
+
+ extent.unite (s->extent_box ());
+ if (scm_is_pair (s->expr ()) && scm_is_eq (cs, s->expr ()))
+ {
+ expr = scm_reverse_x (scm_list_copy (scm_cdr (s->expr ())),
+ expr);
+ }
+ else
+ expr = scm_cons (s->expr (), expr);
+
+ args = scm_cdr (args);
+ }
- if (!m)
- SCM_ASSERT_TYPE(m, gh_car (args), SCM_ARGn, __FUNCTION__,
- "Stencil");
+ expr = scm_cons (cs, scm_reverse_x (expr, SCM_EOL));
+ return Stencil (extent, expr).smobbed_copy ();
+}
+
+LY_DEFINE (ly_make_stencil, "ly:make-stencil",
+ 1, 2, 0, (SCM expr, SCM xext, SCM yext),
+ "Stencils are device independent output expressions."
+ " They carry two pieces of information:\n"
+ "\n"
+ "@enumerate\n"
+ "@item\n"
+ "A specification of how to print this object."
+ " This specification is processed by the output backends,"
+ " for example @file{scm/output-ps.scm}.\n"
+ "\n"
+ "@item\n"
+ "The vertical and horizontal extents of the object, given as"
+ " pairs. If an extent is unspecified (or if you use"
+ " @code{empty-interval} as its value), it is taken to be empty.\n"
+ "@end enumerate\n")
+{
+ SCM_ASSERT_TYPE (!scm_is_pair (expr)
+ || is_stencil_head (scm_car (expr)),
+ expr, SCM_ARG1, __FUNCTION__, "registered stencil expression");
- result.add_stencil (*m);
+ Interval x;
+ if (!SCM_UNBNDP (xext))
+ {
+ LY_ASSERT_TYPE (is_number_pair, xext, 2);
+ x = ly_scm2interval (xext);
+ }
- args = gh_cdr (args);
+ Interval y;
+ if (!SCM_UNBNDP (yext))
+ {
+ LY_ASSERT_TYPE (is_number_pair, yext, 3);
+ y = ly_scm2interval (yext);
}
-
- return result.smobbed_copy ();
+
+ Box b (x, y);
+ Stencil s (b, expr);
+ return s.smobbed_copy ();
}
-LY_DEFINE(ly_make_stencil,
- "ly:make-stencil", 3, 0, 0, (SCM expr, SCM xext, SCM yext),
- " \n"
- "Stencils are a device independent output expressions."
- "They carry two pieces of information: \n\n"
- "1: a specification of how to print this object. "
- "This specification is processed by the output backends, for example "
- "@file{scm/output-tex.scm}.\n\n"
- "2: the vertical and horizontal extents of the object.\n\n"
-
- )
+LY_DEFINE (ly_stencil_aligned_to, "ly:stencil-aligned-to",
+ 3, 0, 0, (SCM stil, SCM axis, SCM dir),
+ "Align @var{stil} using its own extents. @var{dir} is a number."
+ " @w{@code{-1}} and @code{1} are left and right, respectively."
+ " Other values are interpolated (so @code{0} means the center).")
{
- SCM_ASSERT_TYPE (is_number_pair (xext), xext, SCM_ARG2, __FUNCTION__, "number pair");
- SCM_ASSERT_TYPE (is_number_pair (yext), yext, SCM_ARG3, __FUNCTION__, "number pair");
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ LY_ASSERT_TYPE (is_axis, axis, 2);
+ LY_ASSERT_TYPE (scm_is_number, dir, 3);
+
+ Stencil target = *unsmob<Stencil> (stil);
- Box b (ly_scm2interval (xext), ly_scm2interval(yext));
- Stencil m (b, expr);
- return m.smobbed_copy ();
+ target.align_to ((Axis)scm_to_int (axis),
+ scm_to_double (dir));
+ return target.smobbed_copy ();
}
+LY_DEFINE (ly_stencil_fonts, "ly:stencil-fonts",
+ 1, 0, 0, (SCM s),
+ "Analyze @var{s}, and return a list of fonts used"
+ " in@tie{}@var{s}.")
+{
+ LY_ASSERT_SMOB (Stencil, s, 1);
+ Stencil *stil = unsmob<Stencil> (s);
+ return find_expression_fonts (stil->expr ());
+}
-SCM
-fontify_atom (Font_metric const * met, SCM f)
+LY_DEFINE (ly_stencil_in_color, "ly:stencil-in-color",
+ 4, 0, 0, (SCM stc, SCM r, SCM g, SCM b),
+ "Put @var{stc} in a different color.")
{
- if (f == SCM_EOL)
- return f;
- else
- return scm_list_n (ly_symbol2scm ("fontify"),
- ly_quote_scm (met->description_), f, SCM_UNDEFINED);
+ LY_ASSERT_SMOB (Stencil, stc, 1);
+ Stencil *stil = unsmob<Stencil> (stc);
+ return Stencil (stil->extent_box (),
+ scm_list_3 (ly_symbol2scm ("color"),
+ scm_list_3 (r, g, b),
+ stil->expr ())).smobbed_copy ();
}
-LY_DEFINE(ly_fontify_atom,"ly:fontify-atom", 2, 0, 0,
- (SCM met, SCM f),
- "Add a font selection command for the font metric @var{met} to @var{f}.")
+struct Stencil_interpret_arguments
{
- SCM_ASSERT_TYPE(unsmob_metrics (met), met, SCM_ARG1, __FUNCTION__, "font metric");
+ SCM func;
+ SCM arg1;
+};
- return fontify_atom (unsmob_metrics (met), f);
+SCM stencil_interpret_in_scm (void *p, SCM expr)
+{
+ Stencil_interpret_arguments *ap = (Stencil_interpret_arguments *) p;
+ return scm_call_2 (ap->func, ap->arg1, expr);
}
-LY_DEFINE(ly_align_to_x,"ly:stencil-align-to!", 3, 0, 0, (SCM mol, SCM axis, SCM dir),
- "Align @var{mol} using its own extents. @var{dir} is a number -1, 1 are "
- " left and right respectively. Other values are interpolated (so 0 means "
- " the center. ")
+LY_DEFINE (ly_interpret_stencil_expression, "ly:interpret-stencil-expression",
+ 4, 0, 0, (SCM expr, SCM func, SCM arg1, SCM offset),
+ "Parse @var{expr}, feed bits to @var{func} with first arg"
+ " @var{arg1} having offset @var{offset}.")
{
- SCM_ASSERT_TYPE(unsmob_stencil (mol), mol, SCM_ARG1, __FUNCTION__, "stencil");
- SCM_ASSERT_TYPE(is_axis (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE(gh_number_p (dir), dir, SCM_ARG3, __FUNCTION__, "number");
+ LY_ASSERT_TYPE (ly_is_procedure, func, 2);
- unsmob_stencil (mol)->align_to ((Axis)gh_scm2int (axis),
- gh_scm2double (dir));
+ Stencil_interpret_arguments a;
+ a.func = func;
+ a.arg1 = arg1;
+ Offset o = ly_scm2offset (offset);
+
+ interpret_stencil_expression (expr, stencil_interpret_in_scm, (void *) & a, o);
+
+ return SCM_UNSPECIFIED;
+}
+
+LY_DEFINE (ly_bracket, "ly:bracket",
+ 4, 0, 0,
+ (SCM a, SCM iv, SCM t, SCM p),
+ "Make a bracket in direction@tie{}@var{a}. The extent of the"
+ " bracket is given by @var{iv}. The wings protrude by an amount"
+ " of@tie{}@var{p}, which may be negative. The thickness is given"
+ " by@tie{}@var{t}.")
+{
+ LY_ASSERT_TYPE (is_axis, a, 1);
+ LY_ASSERT_TYPE (is_number_pair, iv, 2);
+ LY_ASSERT_TYPE (scm_is_number, t, 3);
+ LY_ASSERT_TYPE (scm_is_number, p, 4);
+
+ return Lookup::bracket ((Axis)scm_to_int (a), ly_scm2interval (iv),
+ scm_to_double (t),
+ scm_to_double (p),
+ 0.95 * scm_to_double (t)).smobbed_copy ();
+}
+
+LY_DEFINE (ly_stencil_rotate, "ly:stencil-rotate",
+ 4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y),
+ "Return a stencil @var{stil} rotated @var{angle} degrees around"
+ " the relative offset (@var{x}, @var{y}). E.g., an offset of"
+ " (-1, 1) will rotate the stencil around the left upper corner.")
+{
+ Stencil *s = unsmob<Stencil> (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ LY_ASSERT_TYPE (scm_is_number, angle, 2);
+ LY_ASSERT_TYPE (scm_is_number, x, 3);
+ LY_ASSERT_TYPE (scm_is_number, y, 4);
+ Real a = scm_to_double (angle);
+ Real x_off = scm_to_double (x);
+ Real y_off = scm_to_double (y);
+
+ SCM new_s = s->smobbed_copy ();
+ Stencil *q = unsmob<Stencil> (new_s);
+ q->rotate_degrees (a, Offset (x_off, y_off));
+ return new_s;
+}
- return SCM_UNDEFINED;
+LY_DEFINE (ly_stencil_rotate_absolute, "ly:stencil-rotate-absolute",
+ 4, 0, 0, (SCM stil, SCM angle, SCM x, SCM y),
+ "Return a stencil @var{stil} rotated @var{angle} degrees around"
+ " point (@var{x}, @var{y}), given in absolute coordinates.")
+{
+ Stencil *s = unsmob<Stencil> (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ LY_ASSERT_TYPE (scm_is_number, angle, 2);
+ LY_ASSERT_TYPE (scm_is_number, x, 3);
+ LY_ASSERT_TYPE (scm_is_number, y, 4);
+ Real a = scm_to_double (angle);
+ Real x_off = scm_to_double (x);
+ Real y_off = scm_to_double (y);
+
+ SCM new_s = s->smobbed_copy ();
+ Stencil *q = unsmob<Stencil> (new_s);
+ q->rotate_degrees_absolute (a, Offset (x_off, y_off));
+ return new_s;
+}
+
+LY_DEFINE (ly_round_filled_box, "ly:round-filled-box",
+ 3, 0, 0,
+ (SCM xext, SCM yext, SCM blot),
+ "Make a @code{Stencil} object that prints a black box of"
+ " dimensions @var{xext}, @var{yext} and roundness @var{blot}.")
+{
+ LY_ASSERT_TYPE (is_number_pair, xext, 1);
+ LY_ASSERT_TYPE (is_number_pair, yext, 2);
+ LY_ASSERT_TYPE (scm_is_number, blot, 3);
+
+ return Lookup::round_filled_box (Box (ly_scm2interval (xext), ly_scm2interval (yext)),
+ scm_to_double (blot)).smobbed_copy ();
+}
+
+LY_DEFINE (ly_round_filled_polygon, "ly:round-filled-polygon",
+ 2, 1, 0,
+ (SCM points, SCM blot, SCM extroversion),
+ "Make a @code{Stencil} object that prints a black polygon with"
+ " corners at the points defined by @var{points} (list of coordinate"
+ " pairs) and roundness @var{blot}. Optional"
+ "@var{extroversion} shifts the outline outward, with the"
+ "default of@tie{}@code{-1.0} keeping the outer boundary of"
+ "the outline just inside of the polygon.")
+{
+ SCM_ASSERT_TYPE (scm_ilength (points) > 0, points, SCM_ARG1, __FUNCTION__, "list of coordinate pairs");
+ LY_ASSERT_TYPE (scm_is_number, blot, 2);
+ Real ext = -1;
+ if (!SCM_UNBNDP (extroversion))
+ {
+ LY_ASSERT_TYPE (scm_is_number, extroversion, 3);
+ ext = scm_to_double (extroversion);
+ }
+ vector<Offset> pts;
+ for (SCM p = points; scm_is_pair (p); p = scm_cdr (p))
+ {
+ SCM scm_pt = scm_car (p);
+ if (scm_is_pair (scm_pt))
+ {
+ pts.push_back (ly_scm2offset (scm_pt));
+ }
+ else
+ {
+ // TODO: Print out warning
+ }
+ }
+ return Lookup::round_filled_polygon (pts, scm_to_double (blot), ext)
+ .smobbed_copy ();
+}
+
+LY_DEFINE (ly_register_stencil_expression, "ly:register-stencil-expression",
+ 1, 0, 0,
+ (SCM symbol),
+ "Add @var{symbol} as head of a stencil expression.")
+{
+ LY_ASSERT_TYPE (ly_is_symbol, symbol, 1);
+ register_stencil_head (symbol);
+ return SCM_UNSPECIFIED;
+}
+
+LY_DEFINE (ly_all_stencil_expressions, "ly:all-stencil-expressions",
+ 0, 0, 0,
+ (),
+ "Return all symbols recognized as stencil expressions.")
+{
+ return all_stencil_heads ();
+}
+
+LY_DEFINE (ly_stencil_scale, "ly:stencil-scale",
+ 3, 0, 0, (SCM stil, SCM x, SCM y),
+ "Scale stencil @var{stil} using the horizontal and vertical"
+ " scaling factors @var{x} and @var{y}. Negative values will"
+ " flip or mirror @var{stil} without changing its origin;"
+ " this may result in collisions unless it is repositioned.")
+{
+ Stencil *s = unsmob<Stencil> (stil);
+ LY_ASSERT_SMOB (Stencil, stil, 1);
+ LY_ASSERT_TYPE (scm_is_number, x, 2);
+ LY_ASSERT_TYPE (scm_is_number, y, 3);
+
+ SCM new_s = s->smobbed_copy ();
+ Stencil *q = unsmob<Stencil> (new_s);
+
+ q->scale (scm_to_double (x), scm_to_double (y));
+ return new_s;
+}
+
+LY_DEFINE (ly_stencil_outline, "ly:stencil-outline",
+ 2, 0, 0, (SCM stil, SCM outline),
+ "Return a stencil with the stencil expression (inking)"
+ " of stencil @var{stil} but with outline and dimensions"
+ " from stencil @var{outline}.")
+{
+ Stencil s = *LY_ASSERT_SMOB (Stencil, stil, 1);
+ Stencil o = *LY_ASSERT_SMOB (Stencil, outline, 2);
+ return s.with_outline (o).smobbed_copy ();
}