lyric-extender.cc -- implement Lyric_extender
source file of the GNU LilyPond music typesetter
- (c) 1998--2002 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 1998--2004 Jan Nieuwenhuizen <janneke@gnu.org>
Han-Wen Nienhuys
*/
+#include <math.h>
#include "box.hh"
#include "warn.hh"
#include "paper-column.hh"
#include "paper-def.hh"
#include "lyric-extender.hh"
+#include "note-head.hh"
+#include "group-interface.hh"
+bool
+Lyric_extender::is_visible (Grob *gr)
+{
+ Spanner*me = dynamic_cast<Spanner*> (gr);
+
+ SCM heads = me->get_grob_property ("heads");
+ int l = scm_ilength (heads);
+ if (l == 0)
+ return false;
+
+ return true;
+}
+
MAKE_SCHEME_CALLBACK (Lyric_extender,brew_molecule,1)
SCM
Lyric_extender::brew_molecule (SCM smob)
{
- Spanner *sp = unsmob_spanner (smob);
-
- // ugh: refp
- Real leftext = sp->get_bound (LEFT)->extent (sp->get_bound (LEFT),
- X_AXIS).length ();
-
- Real sl = sp->paper_l ()->get_var ("linethickness");
- Real righttrim = 0.5; // default to half a space gap on the right
- SCM righttrim_scm = sp->get_grob_property ("right-trim-amount");
- if (gh_number_p (righttrim_scm)) {
- righttrim = gh_scm2double (righttrim_scm);
- }
- // The extender can exist in the word space of the left lyric ...
- SCM space = sp->get_bound (LEFT)->get_grob_property ("word-space");
- if (gh_number_p (space))
+ Spanner *me = unsmob_spanner (smob);
+ Item *l = me->get_bound (LEFT);
+ Item *r = me->get_bound (RIGHT);
+ Grob *common = l->common_refpoint (r, X_AXIS);
+
+
+ Real sl = me->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
+
+ Link_array<Grob> heads (Pointer_group_interface__extract_grobs (me, (Grob*)0,
+ "heads"));
+
+ if (!heads.size () && r->break_status_dir () == CENTER)
+ return SCM_EOL;
+
+ common = common_refpoint_of_array (heads, common, X_AXIS);
+
+ Real left_point = 0.0;
+ if (l->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
+ left_point = l->extent (common, X_AXIS)[RIGHT];
+ else
+ left_point = heads[0]->extent (common, X_AXIS)[LEFT];
+
+ if (isinf (left_point))
+ return SCM_EOL;
+
+ /*
+ It seems that short extenders are even lengthened to go past the
+ note head, but haven't found a pattern in it yet. --hwn 1/1/04
+
+ */
+ SCM minlen = me->get_grob_property ("minimum-length");
+ Real right_point
+ = left_point + (robust_scm2double (minlen,0));
+
+ Spanner *orig = dynamic_cast<Spanner*> (me->original_);
+ bool last_line = orig
+ && (me->get_break_index () == orig->broken_intos_.size() - 2)
+ && !Lyric_extender::is_visible (orig->broken_intos_.top ());
+
+
+ if (heads.size ())
+ right_point = right_point >? heads.top ()->extent (common, X_AXIS)[RIGHT];
+
+ Real h = sl * robust_scm2double (me->get_grob_property ("thickness"), 0);
+ Real pad = 2* h;
+
+ if (!r->break_status_dir ())
+ right_point = right_point <? (r->extent (common, X_AXIS)[LEFT] - pad);
+ else if (!last_line)
{
- leftext -= gh_scm2double (space);
+ /*
+ run to end of line.
+ */
+ right_point = right_point >? (r->extent (common, X_AXIS)[LEFT] - pad);
}
- Real w = sp->spanner_length () - leftext - righttrim;
- Real h = sl * gh_scm2double (sp->get_grob_property ("height"));
- Molecule mol (Lookup::filledbox (Box (Interval (0,w), Interval (0,h))));
- mol.translate (Offset (leftext, 0));
- return mol.smobbed_copy ();
-}
+ if (isinf (right_point))
+ {
+ programming_error ("Right point of extender not defined?");
+ right_point = r->relative_coordinate (common, X_AXIS);
+ }
-void
-Lyric_extender::set_textitem (Spanner*sp, Direction d, Grob*s)
-{
- sp->set_bound (d, s);
- sp->add_dependency (s);
-}
+ left_point += pad;
+ Real w = right_point - left_point;
+ if (w < 1.5 * h)
+ return SCM_EOL;
+
+ Molecule mol (Lookup::round_filled_box (Box (Interval (0,w), Interval (0,h)),
+ 0.8 * h));
+ mol.translate_axis (left_point - me->relative_coordinate (common, X_AXIS), X_AXIS);
+ return mol.smobbed_copy ();
+}
ADD_INTERFACE (Lyric_extender,"lyric-extender-interface",
- "The extender is a simple line at the baseline of the lyric
-that helps show the length of a melissima (tied/slurred note).",
- "word-space height right-trim-amount");
+ "The extender is a simple line at the baseline of the lyric "
+ " that helps show the length of a melissima (tied/slurred note).",
+ "thickness heads");