source file of the GNU LilyPond music typesetter
- (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include <math.h>
expr_ = scm_list_n (ly_symbol2scm ("translate-molecule"),
ly_offset2scm (o),
expr_, SCM_UNDEFINED);
- if (!empty_b ())
+ if (!is_empty ())
dim_.translate (o);
}
void
-Molecule::align_to (Axis a, Direction d)
+Molecule::align_to (Axis a, Real x)
{
- if (empty_b())
+ if (is_empty ())
return ;
Interval i (extent (a));
- Real r = (d == CENTER) ? i.center () : i[d];
- translate_axis (-r, a);
+ translate_axis (-i.linear_combination (x), a);
}
+/*
+ See scheme Function.
+ */
void
-Molecule::add_at_edge (Axis a, Direction d, Molecule const &m, Real padding)
+Molecule::add_at_edge (Axis a, Direction d, Molecule const &m, Real padding,
+ Real minimum)
{
- Real my_extent= empty_b () ? 0.0 : dim_[a][d];
+ Real my_extent= is_empty () ? 0.0 : dim_[a][d];
Interval i (m.extent (a));
Real his_extent;
- if (i.empty_b ())
+ if (i.is_empty ())
{
programming_error ("Molecule::add_at_edge: adding empty molecule.");
his_extent = 0.0;
else
his_extent = i[-d];
- Real offset = my_extent - his_extent;
+ Real offset = (my_extent - his_extent) + d*padding;
+ if (minimum > 0 && fabs (offset) < minimum)
+ offset = sign (offset) * minimum;
+
Molecule toadd (m);
- toadd.translate_axis (offset + d * padding, a);
+ toadd.translate_axis (offset, a);
add_molecule (toadd);
}
-LY_DEFINE(ly_set_molecule_extent_x,"ly-set-molecule-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
-@var{axis} direction (0 or 1 for x- and y-axis respectively).
-
-Note that an extent @code{(A . B)} is an interval and hence @code{A} is
-smaller than @code{B}, and is often negative.
-5")
-{
- Molecule* m = unsmob_molecule (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "molecule");
- SCM_ASSERT_TYPE (ly_axis_p (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE (ly_number_pair_p (np), np, SCM_ARG3, __FUNCTION__, "number pair");
-
- Interval iv = ly_scm2interval (np);
- m->dim_[Axis (gh_scm2int (axis))] = iv;
-
- return SCM_UNDEFINED;
-}
-
-LY_DEFINE(ly_get_molecule_extent,
- "ly-get-molecule-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).
-")
-{
- Molecule *m = unsmob_molecule (mol);
- SCM_ASSERT_TYPE (m, mol, SCM_ARG1, __FUNCTION__, "molecule");
- SCM_ASSERT_TYPE (ly_axis_p (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
-
- return ly_interval2scm (m->extent (Axis (gh_scm2int (axis))));
-}
-
-
-LY_DEFINE(ly_molecule_combined_at_edge,
- "ly-combine-molecule-at-edge",
- 5 , 0, 0, (SCM first, SCM axis, SCM direction,
- SCM second, SCM padding),
- "Construct a molecule 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). @var{padding} specifies extra
-space to add in between measured in global staff space.")
-
-{
- Molecule * m1 = unsmob_molecule (first);
- Molecule * m2 = unsmob_molecule (second);
- Molecule result;
-
-
- SCM_ASSERT_TYPE(ly_axis_p (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE(ly_dir_p (direction), direction, SCM_ARG3, __FUNCTION__, "dir");
- SCM_ASSERT_TYPE(gh_number_p (padding), padding, SCM_ARG4, __FUNCTION__, "number");
-
- if (m1)
- result = *m1;
- if (m2)
- result.add_at_edge (Axis (gh_scm2int (axis)), Direction (gh_scm2int (direction)),
- *m2, gh_scm2double (padding));
-
- return result.smobbed_copy ();
-}
-
-/*
- FIXME: support variable number of arguments "
- */
-LY_DEFINE(ly_add_molecule ,
- "ly-add-molecule", 2, 0,0,(SCM first, SCM second),
- "Combine two molecules."
- )
-{
- Molecule * m1 = unsmob_molecule (first);
- Molecule * m2 = unsmob_molecule (second);
- Molecule result;
-
-
- if (m1)
- result = *m1;
- if (m2)
- result.add_molecule (*m2);
-
- return result.smobbed_copy ();
-}
-
-LY_DEFINE(ly_make_molecule,
- "ly-make-molecule", 3, 0, 0, (SCM expr, SCM xext, SCM yext),
- "
-The objective of any typesetting system is to put ink on paper in the
-right places. For LilyPond, this final stage is left to the @TeX{} and
-the printer subsystem. For lily, the last stage in processing a score is
-outputting a description of what to put where. This description roughly
-looks like
-@example
- PUT glyph AT (x,y)
- PUT glyph AT (x,y)
- PUT glyph AT (x,y)
-@end example
-you merely have to look at the tex output of lily to see this.
-Internally these instructions are encoded in Molecules.@footnote{At some
-point LilyPond also contained Atom-objects, but they have been replaced
-by Scheme expressions, making the name outdated.} A molecule is
-what-to-print-where information that also contains dimension information
-(how large is this glyph?).
-
-Conceptually, Molecules can be constructed from Scheme code, by
-translating a Molecule and by combining two molecules. In BNF
-notation:
-
-@example
-Molecule :: COMBINE Molecule Molecule
- | TRANSLATE Offset Molecule
- | GLYPH-DESCRIPTION
- ;
-@end example
-
-If you are interested in seeing how this information is stored, you
-can run with the @code{-f scm} option. The scheme expressions are then
-dumped in the output file.")
-{
- SCM_ASSERT_TYPE (ly_number_pair_p (xext), xext, SCM_ARG2, __FUNCTION__, "number pair");
- SCM_ASSERT_TYPE (ly_number_pair_p (yext), yext, SCM_ARG3, __FUNCTION__, "number pair");
-
- Box b (ly_scm2interval (xext), ly_scm2interval(yext));
- Molecule m (b, expr);
- return m.smobbed_copy ();
-}
-
-SCM
-fontify_atom (Font_metric const * met, SCM f)
-{
- if (f == SCM_EOL)
- return f;
- else
- return scm_list_n (ly_symbol2scm ("fontify"),
- ly_quote_scm (met->description_), f, SCM_UNDEFINED);
-}
-
-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}.")
-{
- SCM_ASSERT_TYPE(unsmob_metrics (met), met, SCM_ARG1, __FUNCTION__, "font metric");
-
- return fontify_atom (unsmob_metrics (met), f);
-}
-LY_DEFINE(ly_align_to_x,"ly-align-to!", 3, 0, 0, (SCM mol, SCM axis, SCM dir),
- "Align @var{mol} using its own extents.")
-{
- SCM_ASSERT_TYPE(unsmob_molecule (mol), mol, SCM_ARG1, __FUNCTION__, "molecule");
- SCM_ASSERT_TYPE(ly_axis_p (axis), axis, SCM_ARG2, __FUNCTION__, "axis");
- SCM_ASSERT_TYPE(ly_dir_p (dir), dir, SCM_ARG3, __FUNCTION__, "dir");
-
- unsmob_molecule (mol)->align_to ((Axis)gh_scm2int (axis), Direction (gh_scm2int (dir)));
-
- return SCM_UNDEFINED;
-}
-
/*
while expr_ == '()
*/
bool
-Molecule::empty_b () const
+Molecule::is_empty () const
{
return expr_ == SCM_EOL;
}
Molecule::print_smob (SCM , SCM port, scm_print_state *)
{
scm_puts ("#<Molecule ", port);
-#if 0
- Molecule *r = (Molecule *) ly_cdr (s);
- String string (r->string ());
- scm_puts ((char *)str.to_str0 (), port);
-#endif
scm_puts (" >", port);
return 1;
return r->expr_;
}
-IMPLEMENT_TYPE_P (Molecule, "molecule?");
+IMPLEMENT_TYPE_P (Molecule, "ly:molecule?");
IMPLEMENT_DEFAULT_EQUAL_P (Molecule);
projects / lilypond.git / blobdiff