source file of the GNU LilyPond music typesetter
- (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
-#include <math.h>
-#include <libc-extension.hh> // isinf
-
-#include "input-smob.hh"
-#include "font-metric.hh"
-#include "dimensions.hh"
-#include "interval.hh"
-#include "string.hh"
#include "stencil.hh"
+
+#include "main.hh"
+#include "font-metric.hh"
+#include "input.hh"
+#include "string-convert.hh"
#include "warn.hh"
#include "ly-smobs.icc"
SCM
Stencil::mark_smob (SCM smob)
{
- Stencil *s = (Stencil*) ly_cdr (smob);
+ Stencil *s = (Stencil *) SCM_CELL_WORD_1 (smob);
return s->expr_;
}
return dim_[a];
}
-/* Hmm... maybe this is not such a good idea ; stuff can be empty,
- while expr_ == '() */
bool
Stencil::is_empty () const
{
- return expr_ == SCM_EOL;
+ return (expr_ == SCM_EOL
+ || dim_[X_AXIS].is_empty ()
+ || dim_[Y_AXIS].is_empty ());
}
SCM
{
return dim_;
}
-Offset
-Stencil::origin () const
+
+void
+Stencil::rotate (Real a, Offset off)
+{
+ rotate_degrees (a * 180/M_PI, off);
+}
+
+/*
+ Rotate this stencil around the point ABSOLUTE_OFF.
+
+ */
+void
+Stencil::rotate_degrees_absolute (Real a, Offset absolute_off)
+{
+ const Real x = absolute_off[X_AXIS];
+ const Real y = absolute_off[Y_AXIS];
+
+ /*
+ * Build scheme expression (processed in stencil-interpret.cc)
+ */
+ /* TODO: by hanwenn 2008/09/10 14:38:56:
+ * in effect, this copies the underlying expression. It might be a
+ * little bit nicer to mirror this in the api, ie. make a
+ * Stencil::rotated()
+ * and have Stencil::rotate be an abbrev of
+ * *this = rotated()
+ */
+
+ expr_ = scm_list_n (ly_symbol2scm ("rotate-stencil"),
+ scm_list_2 (scm_from_double (a),
+ scm_cons (scm_from_double (x), scm_from_double (y))),
+ expr_, SCM_UNDEFINED);
+
+ /*
+ * Calculate the new bounding box
+ */
+ Box shifted_box = extent_box ();
+ shifted_box.translate (-absolute_off);
+
+ vector<Offset> pts;
+ pts.push_back (Offset (shifted_box.x ().at(LEFT), shifted_box.y ().at(DOWN)));
+ pts.push_back (Offset (shifted_box.x ().at(RIGHT), shifted_box.y ().at(DOWN)));
+ pts.push_back (Offset (shifted_box.x ().at(RIGHT), shifted_box.y ().at(UP)));
+ pts.push_back (Offset (shifted_box.x ().at(LEFT), shifted_box.y ().at(UP)));
+
+ const Offset rot = complex_exp (Offset (0, a * M_PI / 180.0));
+ dim_.set_empty ();
+ for (vsize i = 0; i < pts.size (); i++)
+ dim_.add_point (pts[i] * rot + absolute_off);
+}
+
+/*
+ Rotate this stencil around the point RELATIVE_OFF.
+
+ RELATIVE_OFF is measured in terms of the extent of the stencil, so
+ -1 = LEFT/DOWN edge, 1 = RIGHT/UP edge.
+ */
+void
+Stencil::rotate_degrees (Real a, Offset relative_off)
{
- return origin_;
+ /*
+ * Calculate the center of rotation
+ */
+ const Real x = extent (X_AXIS).linear_combination (relative_off[X_AXIS]);
+ const Real y = extent (Y_AXIS).linear_combination (relative_off[Y_AXIS]);
+ rotate_degrees_absolute (a, Offset (x, y));
}
void
Axis a = X_AXIS;
while (a < NO_AXES)
{
- if (abs (o[a]) > 100 CM
- || isinf (o[a]) || isnan (o[a]))
+ if (isinf (o[a])
+ || isnan (o[a])
+
+ // ugh, hardcoded.
+ || fabs (o[a]) > 1e6)
{
- programming_error ("Improbable offset for translation: setting to zero");
- o[a] = 0.0;
+ programming_error (String_convert::form_string ("Improbable offset for stencil: %f staff space", o[a])
+ + "\n"
+ + "Setting to zero.");
+ o[a] = 0.0;
+ if (strict_infinity_checking)
+ scm_misc_error (__FUNCTION__, "Improbable offset.", SCM_EOL);
}
incr (a);
}
expr_, SCM_UNDEFINED);
if (!is_empty ())
dim_.translate (o);
- origin_ += o;
}
-
+
void
Stencil::translate_axis (Real x, Axis a)
{
- Offset o (0,0);
+ Offset o (0, 0);
o[a] = x;
translate (o);
}
dim_.unite (s.dim_);
}
-
-
void
Stencil::set_empty (bool e)
{
}
else
{
- dim_[X_AXIS] = Interval (0,0);
- dim_[Y_AXIS] = Interval (0,0);
+ dim_[X_AXIS] = Interval (0, 0);
+ dim_[Y_AXIS] = Interval (0, 0);
}
}
translate_axis (-i.linear_combination (x), a);
}
-/* FIXME: unintuitive naming, you would expect *this to be moved.
- Kept (keeping?) API for compat with add_at_edge ().
-
- What is PADDING, what is MINIMUM, exactly? */
-Stencil
-Stencil::moved_to_edge (Axis a, Direction d, Stencil const &s,
- Real padding, Real minimum) const
+/* See scheme Function. */
+void
+Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding)
{
Interval my_extent = dim_[a];
Interval i (s.extent (a));
Real his_extent;
if (i.is_empty ())
{
- programming_error ("Stencil::moved_to_edge: adding empty stencil.");
+ programming_error ("Stencil::add_at_edge: adding empty stencil.");
his_extent = 0.0;
}
else
+ d * padding;
Stencil toadd (s);
- toadd.translate_axis (offset,a);
-
- if (minimum > 0 && d * (-origin ()[a] + toadd.origin ()[a]) < minimum)
- toadd.translate_axis ( -toadd.origin ()[a]
- + origin ()[a] + d * minimum, a);
-
- return toadd;
+ toadd.translate_axis (offset, a);
+ add_stencil (toadd);
}
-/* See scheme Function. */
-void
-Stencil::add_at_edge (Axis a, Direction d, Stencil const &s, Real padding,
- Real minimum)
-{
- add_stencil (moved_to_edge (a, d, s, padding, minimum));
-}
-
-
-/****************************************************************/
-
-
-void
-interpret_stencil_expression (SCM expr,
- void (*func) (void*, SCM),
- void *func_arg,
- Offset o)
-{
- while (1)
- {
- if (!ly_c_pair_p (expr))
- return;
-
- SCM head = ly_car (expr);
-
- if (head == ly_symbol2scm ("translate-stencil"))
- {
- o += ly_scm2offset (ly_cadr (expr));
- expr = ly_caddr (expr);
- }
- else if (head == ly_symbol2scm ("combine-stencil"))
- {
- for (SCM x = ly_cdr (expr); ly_c_pair_p (x); x = ly_cdr (x))
- interpret_stencil_expression (ly_car (x), func, func_arg, o);
- return;
- }
- else if (head == ly_symbol2scm ("grob-cause"))
- {
- SCM grob = ly_cadr (expr);
-
- (*func) (func_arg, scm_list_2 (head, grob));
- interpret_stencil_expression (ly_caddr (expr), func, func_arg, o);
- (*func) (func_arg, scm_list_1 (ly_symbol2scm ("no-origin")));
- }
- else
- {
- (*func) (func_arg,
- scm_list_4 (ly_symbol2scm ("placebox"),
- scm_make_real (o[X_AXIS]),
- scm_make_real (o[Y_AXIS]),
- expr));
- return;
- }
- }
-}
-
-
-struct Font_list
-{
- SCM fonts_;
-};
-
-static void
-find_font_function (void *fs, SCM x)
-{
- Font_list *me = (Font_list*) fs;
-
- if (ly_car (x) == ly_symbol2scm ("placebox"))
- {
- SCM args = ly_cdr (x);
- SCM what = ly_caddr (args);
-
- if (ly_c_pair_p (what))
- {
- SCM head = ly_car (what);
- if (ly_symbol2scm ("text") == head)
- me->fonts_ = scm_cons (ly_cadr (what), me->fonts_);
- else if (head == ly_symbol2scm ("char"))
- me->fonts_ = scm_cons (ly_cadr (what), me->fonts_);
- }
- }
-}
-
-SCM
-find_expression_fonts (SCM expr)
-{
- Font_list fl;
-
- fl.fonts_ = SCM_EOL;
-
- interpret_stencil_expression (expr, &find_font_function,
- (void*) &fl, Offset (0,0));
-
- return fl.fonts_;
-}
-
-
-LY_DEFINE (ly_stencil_fonts, "ly:stencil-fonts",
- 1, 0, 0, (SCM s),
- " Analyse @var{s}, and return a list of fonts used in @var{s}.")
-{
- Stencil *stil = unsmob_stencil (s);
- SCM_ASSERT_TYPE (stil, s, SCM_ARG1, __FUNCTION__, "Stencil");
- return find_expression_fonts (stil->expr ());
-}
-
-struct Stencil_interpret_arguments
-{
- SCM func;
- SCM arg1;
-};
-
-void stencil_interpret_in_scm (void *p, SCM expr)
+Stencil
+Stencil::in_color (Real r, Real g, Real b) const
{
- Stencil_interpret_arguments *ap = (Stencil_interpret_arguments*) p;
- scm_call_2 (ap->func, ap->arg1, expr);
+ Stencil new_stencil (extent_box (),
+ scm_list_3 (ly_symbol2scm ("color"),
+ scm_list_3 (scm_from_double (r),
+ scm_from_double (g),
+ scm_from_double (b)),
+ expr ()));
+ return new_stencil;
}
-
-
-LY_DEFINE (ly_interpret_stencil_expression, "ly:interpret-stencil-expression",
- 4, 0, 0, (SCM expr, SCM func, SCM arg1, SCM offset),
- "Parse EXPR, feed bits to FUNC with first arg ARG1")
+/* convenience */
+Stencil
+Stencil::translated (Offset z) const
{
- SCM_ASSERT_TYPE (ly_c_procedure_p(func), func, SCM_ARG1, __FUNCTION__,
- "procedure");
-
- 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;
+ Stencil s (*this);
+ s.translate (z);
+ return s;
}
projects / lilypond.git / blobdiff