source file of the GNU LilyPond music typesetter
- (c) 1999 Glen Prideaux <glenprideaux@iname.com>
+ (c) 1999--2004 Glen Prideaux <glenprideaux@iname.com>
- (adapted from extender-spanner)
+ (adapted from lyric-extender)
*/
-/*
- TODO: too complicated implementation. Why the dx_drul?.
- */
-
#include <math.h>
+
#include "box.hh"
-#include "debug.hh"
#include "lookup.hh"
#include "molecule.hh"
-#include "paper-column.hh"
#include "paper-def.hh"
#include "hyphen-spanner.hh"
-#include "dimension-cache.hh"
+#include "paper-column.hh"
+#include "spanner.hh"
+#include "item.hh"
-Hyphen_spanner::Hyphen_spanner ()
- : Spanner ()
-{
- dx_f_drul_[LEFT] = dx_f_drul_[RIGHT] = 0.0;
- set_extent_callback (Score_element::point_dimension_callback,Y_AXIS);
-}
-
-Molecule
-Hyphen_spanner::do_brew_molecule () const
+MAKE_SCHEME_CALLBACK (Hyphen_spanner,brew_molecule,1)
+SCM
+Hyphen_spanner::brew_molecule (SCM smob)
{
- Molecule mol;
-
- Real w = spanner_length ();
+ Spanner * sp = unsmob_spanner (smob);
+ Drul_array<Item*> bounds (sp->get_bound (LEFT),
+ sp->get_bound (RIGHT));
+
+ Grob * common = bounds[LEFT]->common_refpoint (bounds[RIGHT], X_AXIS);
- w += (dx_f_drul_[RIGHT] - dx_f_drul_[LEFT]);
+ Interval span_points;
+ Direction d = LEFT;
+ do
+ {
+ Interval iv = bounds[d]->extent (common, X_AXIS);
- Real th = paper_l ()->get_var ("hyphen_thickness");
- Real h = paper_l ()->get_var ("hyphen_height");
+ span_points[d] = iv.is_empty ()
+ ? bounds[d]->relative_coordinate (common, X_AXIS)
+ : iv[-d];
+ }
+ while (flip (&d) != LEFT);
+
+ Real lt = sp->get_paper ()->get_realvar (ly_symbol2scm ("linethickness"));
+ Real th = robust_scm2double (sp->get_grob_property ("thickness"), 1) * lt ;
+ Real h = robust_scm2double (sp->get_grob_property ("height"), 0.5);
- // UGH. First try: just make the hyphen take 1/3 of the available space
- // for length, use a geometric mean of the available space and some minimum
- Real l = paper_l ()->get_var ("hyphen_minimum_length");
- if(l < w)
- l = sqrt(l*w);
- Molecule a = lookup_l ()->filledbox ( Box (Interval ((w-l)/2,(w+l)/2), Interval (h,h+th)));
- a.translate (Offset (dx_f_drul_[LEFT], 0));
+ // interval?
+
+ Real dp = robust_scm2double (sp->get_grob_property ("dash-period"), 1.0);
+ Real dl = robust_scm2double (sp->get_grob_property ("length"), .5 );
- mol.add_molecule (a);
+ if (dp < dl)
+ dp = 1.5 * dl;
- return mol;
-}
+ Real l = span_points.length ();
+ int n = int (ceil (l/dp - 0.5));
+ if (n <= 0)
+ n = 1;
+ Real space_left = l - dl - (n-1)* dp;
-void
-Hyphen_spanner::after_line_breaking ()
-{
- // UGH
- Real gap = paper_l ()->get_var ("interline");
+ /*
+ If there is not enough space, the hyphen should disappear.
+ */
+ if (space_left < 0)
+ return SCM_EOL;
+
+ Box b (Interval (0, dl), Interval (h,h+th));
+ Molecule dash_mol (Lookup::round_filled_box (b, 0.8 * lt));
- Direction d = LEFT;
- do
+ Molecule total;
+ for (int i = 0; i < n; i++)
{
- Item* t = get_bound (d)
- ? get_bound (d) : get_bound ((Direction)-d);
- if (d == LEFT)
- dx_f_drul_[d] += t->extent (X_AXIS).length ();
- else
- dx_f_drul_[d] -= d * gap / 2;
+ Molecule m (dash_mol);
+ m.translate_axis (span_points[LEFT] + i * dp + space_left / 2, X_AXIS);
+ total.add_molecule (m);
}
- while (flip(&d) != LEFT);
-}
-
-void
-Hyphen_spanner::set_textitem (Direction d, Item* textitem_l)
-{
- set_bound (d, textitem_l);
- add_dependency (textitem_l);
+ total.translate_axis ( -sp->relative_coordinate (common, X_AXIS), X_AXIS);
+ return total.smobbed_copy ();
}
+ADD_INTERFACE (Hyphen_spanner, "lyric-hyphen-interface",
+ "A centred hyphen is a simple line between lyrics used to divide syllables",
+ "thickness height dash-period length");
+
+