source file of the GNU LilyPond music typesetter
- (c) 1999 Glen Prideaux <glenprideaux@iname.com>
+ (c) 1999--2003 Glen Prideaux <glenprideaux@iname.com>
- (adapted from extender-spanner)
+ (adapted from lyric-extender)
*/
#include <math.h>
#include "molecule.hh"
#include "paper-def.hh"
#include "hyphen-spanner.hh"
+#include "paper-column.hh"
#include "spanner.hh"
#include "item.hh"
-MAKE_SCHEME_SCORE_ELEMENT_CALLBACK(Hyphen_spanner,brew_molecule)
+MAKE_SCHEME_CALLBACK (Hyphen_spanner,brew_molecule,1)
SCM
Hyphen_spanner::brew_molecule (SCM smob)
{
- Spanner * sp =dynamic_cast<Spanner*> (unsmob_element (smob));
- Molecule mol;
+ 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);
- Real leftext = sp->get_bound (LEFT)->extent (X_AXIS).length ();
+ Interval span_points;
+ Direction d = LEFT;
+ do
+ {
+ Interval iv = bounds[d]->extent (common, X_AXIS);
- Real ss = sp->paper_l ()->get_var ("staffspace");
- Real lt = sp->paper_l ()->get_var ("stafflinethickness");
- Real th = gh_scm2double (sp->get_elt_property ("thickness")) * lt ;
- Real h = gh_scm2double (sp->get_elt_property ("height")) * ss;
- Real l = gh_scm2double (sp->get_elt_property ("minimum-length")) * ss;
- Real w = sp->spanner_length () - leftext - ss/2;
+ 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 = gh_scm2double (sp->get_grob_property ("thickness")) * lt ;
+ Real h = gh_scm2double (sp->get_grob_property ("height"));
+ // interval?
+
+ Real dp = gh_scm2double (sp->get_grob_property ("dash-period"));
+ Real dl = gh_scm2double (sp->get_grob_property ("length"));
- /* 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
- */
- if(l < w)
- l = sqrt(l*w);
+ if (dp < dl)
+ dp = 1.5 * dl;
- Box b (Interval ( (w-l)/2, (w+l)/2), Interval (h,h+th));
- mol.add_molecule (sp->lookup_l ()->filledbox (b));
- mol.translate_axis(leftext, X_AXIS);
- return mol.create_scheme ();
-}
+ 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;
+
+ /*
+ If there is not enough space, the hyphen should disappear.
+ */
+ if (space_left < 0)
+ return SCM_EOL;
-void
-Hyphen_spanner::set_textitem (Direction d, Item* textitem_l)
-{
- elt_l_->set_bound (d, textitem_l);
- elt_l_->add_dependency (textitem_l);
-}
+ Box b (Interval (0, dl), Interval (h,h+th));
+ Molecule dash_mol (Lookup::round_filled_box (b, 0.8 * lt));
-Hyphen_spanner::Hyphen_spanner (Spanner*s)
-{
- elt_l_ = s;
+ Molecule total;
+ for (int i = 0; i < n; i++)
+ {
+ Molecule m (dash_mol);
+ m.translate_axis (span_points[LEFT] + i * dp + space_left / 2, X_AXIS);
+ total.add_molecule (m);
+ }
+
+ 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");
+
+