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 "lookup.hh"
-#include "molecule.hh"
+#include "stencil.hh"
#include "paper-column.hh"
-#include "paper-def.hh"
+#include "output-def.hh"
#include "lyric-extender.hh"
+#include "note-head.hh"
+#include "group-interface.hh"
-MAKE_SCHEME_CALLBACK (Lyric_extender,brew_molecule,1)
+
+MAKE_SCHEME_CALLBACK (Lyric_extender, print, 1)
SCM
-Lyric_extender::brew_molecule (SCM smob)
+Lyric_extender::print (SCM smob)
{
- Spanner *sp = unsmob_spanner (smob);
- Item* l = sp->get_bound (LEFT);
- Item*r = sp->get_bound (RIGHT);
+ Spanner *me = unsmob_spanner (smob);
+ Item *left_edge = me->get_bound (LEFT);
+ Item *right_text = unsmob_item (me->get_property ("next"));
- Real leftext = l->extent (l, X_AXIS).length ();
-
- Real sl = sp->get_paper ()->get_var ("linethickness");
- Real righttrim = 0.5; // default to half a space gap on the right
-
-
- /*
- If we're broken, we shouldn't extend past the end of the line.
- */
- if (r->break_status_dir () == CENTER)
- {
- SCM righttrim_scm = sp->get_grob_property ("right-trim-amount");
- if (gh_number_p (righttrim_scm))
- {
- righttrim = gh_scm2double (righttrim_scm);
- }
- }
+ Grob *common = left_edge;
+
+ if (right_text)
+ common = common->common_refpoint (right_text, X_AXIS);
- // 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))
- {
- leftext -= gh_scm2double (space);
- }
- Real w = sp->spanner_length () - leftext - righttrim;
+ common = common->common_refpoint (me->get_bound (RIGHT), X_AXIS);
+ Real sl = me->get_paper ()->get_dimension (ly_symbol2scm ("linethickness"));
+ Link_array<Grob> heads (Pointer_group_interface__extract_grobs (me, (Grob*)0,
+ "heads"));
+
+ if (!heads.size ())
+ return SCM_EOL;
+
+ common = common_refpoint_of_array (heads, common, X_AXIS);
- 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 ();
-}
+ Real left_point = 0.0;
+ if (left_edge->internal_has_interface (ly_symbol2scm ("lyric-syllable-interface")))
+ left_point = left_edge->extent (common, X_AXIS)[RIGHT];
+ else if (heads.size ())
+ left_point = heads[0]->extent (common, X_AXIS)[LEFT];
+ else
+ left_point = left_edge->extent (common, X_AXIS)[RIGHT];
-void
-Lyric_extender::set_textitem (Spanner*sp, Direction d, Grob*s)
-{
- sp->set_bound (d, s);
- sp->add_dependency (s);
-}
+ 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_property ("minimum-length");
+ Real right_point
+ = left_point + (robust_scm2double (minlen, 0));
+ if (heads.size ())
+ right_point = right_point >? heads.top ()->extent (common, X_AXIS)[RIGHT];
+ Real h = sl * robust_scm2double (me->get_property ("thickness"), 0);
+ Real pad = 2* h;
+
+ if (right_text)
+ right_point = right_point <? (robust_relative_extent (right_text, common, X_AXIS)[LEFT] - pad);
+
+ /* run to end of line. */
+ right_point = right_point >? (robust_relative_extent (me->get_bound (RIGHT), common, X_AXIS)[LEFT] - pad);
+
+ left_point += pad;
+
+ Real w = right_point - left_point;
+
+ if (w < 1.5 * h)
+ return SCM_EOL;
+
+ Stencil 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).",
+ "next thickness heads");