--- /dev/null
+/*
+ line-spanner.cc -- implement New_line_spanner
+
+ source file of the GNU LilyPond music typesetter
+
+ (c) 2000--2007 Jan Nieuwenhuizen <janneke@gnu.org>
+*/
+
+#include "spanner.hh"
+#include "output-def.hh"
+#include "paper-column.hh"
+#include "staff-symbol-referencer.hh"
+#include "font-interface.hh"
+#include "warn.hh"
+#include "align-interface.hh"
+#include "lookup.hh"
+#include "line-interface.hh"
+#include "moment.hh"
+
+#include "lily-proto.hh"
+#include "grob-interface.hh"
+
+class New_line_spanner
+{
+public:
+ DECLARE_SCHEME_CALLBACK (print, (SCM));
+ DECLARE_SCHEME_CALLBACK (after_line_breaking, (SCM));
+
+ DECLARE_SCHEME_CALLBACK (calc_left_bound_info, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_right_bound_info, (SCM));
+ DECLARE_SCHEME_CALLBACK (calc_bound_info, (SCM, Direction));
+ DECLARE_GROB_INTERFACE();
+
+ static Stencil line_stencil (Grob *me, Offset f, Offset t);
+};
+
+
+
+static Grob *
+line_spanner_common_parent (Grob *me)
+{
+ Grob *common = find_fixed_alignment_parent (me);
+ if (!common)
+ {
+ common = Staff_symbol_referencer::get_staff_symbol (me);
+ if (common)
+ common = common->get_parent (Y_AXIS);
+ else
+ common = me->get_parent (Y_AXIS);
+ }
+
+ return common;
+}
+
+MAKE_SCHEME_CALLBACK (New_line_spanner, after_line_breaking, 1);
+SCM
+New_line_spanner::after_line_breaking (SCM g)
+{
+ Grob *me = unsmob_grob (g);
+ Spanner *sp = dynamic_cast<Spanner *> (me);
+
+ /*
+ We remove the line at the start of the line. For piano voice
+ indicators, it makes no sense to have them at the start of the
+ line.
+
+ I'm not sure what the official rules for glissandi are, but
+ usually the 2nd note of the glissando is "exact", so when playing
+ from the start of the line, there is no need to glide.
+
+ From a typographical p.o.v. this makes sense, since the amount of
+ space left of a note at the start of a line is very small.
+
+ --hwn.
+
+ */
+ if (sp->get_bound (LEFT)->break_status_dir ()
+ && !sp->get_bound (RIGHT)->break_status_dir ())
+ {
+ /*
+ Can't do suicide, since this mucks up finding the trend.
+ */
+ me->set_property ("transparent", SCM_BOOL_T);
+ }
+ return SCM_EOL;
+}
+
+Stencil
+New_line_spanner::line_stencil (Grob *me,
+ Offset from,
+ Offset to)
+{
+ Offset dz = to -from;
+ SCM type = me->get_property ("style");
+
+ Stencil line;
+
+ if (scm_is_symbol (type)
+ && (type == ly_symbol2scm ("line")
+ || type == ly_symbol2scm ("dashed-line")
+ || type == ly_symbol2scm ("dotted-line")
+ || type == ly_symbol2scm ("zigzag")
+ || (type == ly_symbol2scm ("trill") && dz[Y_AXIS] != 0)))
+ {
+ line = Line_interface::line (me, from, to);
+ }
+ else if (scm_is_symbol (type)
+ && type == ly_symbol2scm ("trill"))
+ {
+ SCM alist_chain = Font_interface::text_font_alist_chain (me);
+ SCM style_alist = scm_list_n (scm_cons (ly_symbol2scm ("font-encoding"),
+ ly_symbol2scm ("fetaMusic")),
+ SCM_UNDEFINED);
+
+ Font_metric *fm = select_font (me->layout (),
+ scm_cons (style_alist,
+ alist_chain));
+ Stencil m = fm->find_by_name ("scripts.trill_element");
+ Stencil mol;
+
+ do
+ mol.add_at_edge (X_AXIS, RIGHT, m, 0);
+ while (m.extent (X_AXIS).length ()
+ && mol.extent (X_AXIS).length ()
+ + m.extent (X_AXIS).length () < dz[X_AXIS])
+ ;
+
+ /*
+ FIXME: should center element on x/y
+ */
+ mol.translate_axis (m.extent (X_AXIS).length () / 2, X_AXIS);
+ mol.translate_axis (- (mol.extent (Y_AXIS)[DOWN]
+ + mol.extent (Y_AXIS).length ()) / 2, Y_AXIS);
+
+ mol.translate (from);
+ line = mol;
+ }
+
+ if (to_boolean (me->get_property ("arrow")))
+ line.add_stencil (Line_interface::arrows (me, from, to, false, true));
+
+ return line;
+}
+
+
+SCM
+New_line_spanner::calc_bound_info (SCM smob, Direction dir)
+{
+ Spanner *me = unsmob_spanner (smob);
+
+ Grob *commonx = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT), X_AXIS);
+ commonx = me->common_refpoint (commonx, X_AXIS);
+
+ SCM bound_details = me->get_property ("bound-details");
+
+
+ SCM sym =
+ (me->get_bound (dir)->break_status_dir ())
+ ? (dir == LEFT ? ly_symbol2scm ("left-broken")
+ : ly_symbol2scm ("right-broken"))
+ : (dir == LEFT ? ly_symbol2scm ("left")
+ : ly_symbol2scm ("right"));
+
+ SCM details = ly_assoc_get (sym, bound_details, SCM_BOOL_F);
+ if (details == SCM_BOOL_F)
+ details = ly_assoc_get (ly_symbol2scm ("default"), bound_details, SCM_EOL);
+
+ if (!scm_is_number (ly_assoc_get (ly_symbol2scm ("X"), details, SCM_BOOL_F)))
+ {
+ Direction attach = (Direction)
+ robust_scm2int (ly_assoc_get (ly_symbol2scm ("attach-dir"),
+ details, SCM_BOOL_F),
+ CENTER);
+
+ details = scm_acons (ly_symbol2scm ("X"),
+ scm_from_double (me->get_bound (dir)->extent (commonx, X_AXIS)
+ .linear_combination (attach)),
+ details);
+ }
+
+
+ if (!scm_is_number (ly_assoc_get (ly_symbol2scm ("Y"), details, SCM_BOOL_F)))
+ {
+ Real y = 0.0;
+
+ if (me->get_bound (dir)->break_status_dir ())
+ {
+ /*
+ This is hairy. For the normal case, we simply find common
+ parents, and draw a line between the bounds. When two note
+ heads are on different systems, there is no common parent
+ anymore. We have to find the piano-staff object.
+ */
+
+ Spanner *next_sp = me->broken_neighbor (dir);
+ Item *next_bound = next_sp->get_bound (dir);
+
+ if (next_bound->break_status_dir ())
+ {
+ programming_error ("no note heads for the line spanner on neighbor line?"
+ " Confused.");
+ me->suicide ();
+ return SCM_EOL;
+ }
+
+ Grob *next_common_y = line_spanner_common_parent (next_bound);
+ Interval next_ext = next_bound->extent (next_common_y, Y_AXIS);
+
+ y = next_ext.center ();
+ }
+ else
+ {
+ Grob *commony = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT), Y_AXIS);
+ commony = me->common_refpoint (commony, Y_AXIS);
+
+ details = scm_acons (ly_symbol2scm ("Y"),
+ scm_from_double (me->get_bound (dir)->extent (commony, Y_AXIS).center()),
+ details);
+ }
+ }
+
+ return details;
+}
+
+MAKE_SCHEME_CALLBACK (New_line_spanner, calc_right_bound_info, 1);
+SCM
+New_line_spanner::calc_right_bound_info (SCM smob)
+{
+ return New_line_spanner::calc_bound_info (smob, RIGHT);
+}
+
+MAKE_SCHEME_CALLBACK (New_line_spanner, calc_left_bound_info, 1);
+SCM
+New_line_spanner::calc_left_bound_info (SCM smob)
+{
+ return New_line_spanner::calc_bound_info (smob, LEFT);
+}
+
+MAKE_SCHEME_CALLBACK (New_line_spanner, print, 1);
+SCM
+New_line_spanner::print (SCM smob)
+{
+ Spanner *me = dynamic_cast<Spanner *> (unsmob_grob (smob));
+
+ Interval_t<Moment> moments = me->spanned_time ();
+ if (moments.length () == Moment (0,0))
+ {
+ me->set_property ("transparent", SCM_BOOL_T);
+ return SCM_EOL;
+ }
+
+ Drul_array<SCM> bounds (me->get_property ("left-bound-info"),
+ me->get_property ("right-bound-info"));
+
+
+ Grob *commonx = me->get_bound (LEFT)->common_refpoint (me->get_bound (RIGHT), X_AXIS);
+ commonx = me->common_refpoint (commonx, X_AXIS);
+
+ Drul_array<Offset> span_points;
+
+ Direction d = LEFT;
+ do
+ {
+ Offset z (robust_scm2double (ly_assoc_get (ly_symbol2scm ("X"),
+ bounds[d], SCM_BOOL_F), 0.0)
+ + commonx->relative_coordinate (commonx, X_AXIS),
+ robust_scm2double (ly_assoc_get (ly_symbol2scm ("Y"),
+ bounds[d], SCM_BOOL_F), 0.0));
+
+ span_points[d] = z;
+ }
+ while (flip (&d) != LEFT);
+
+ Offset dz = (span_points[RIGHT] - span_points[LEFT]);
+ Drul_array<Real> gaps;
+ do
+ gaps[d] = robust_scm2double (ly_assoc_get (ly_symbol2scm ("padding"),
+ bounds[d], SCM_BOOL_F), 0.0);
+ while (flip (&d) != LEFT);
+
+ if (gaps[LEFT] + gaps[RIGHT] > dz.length ())
+ {
+ me->set_property ("transparent", SCM_BOOL_T);
+ return SCM_EOL;
+ }
+
+ do
+ span_points[d] += -d * gaps[d] * dz.direction ();
+ while (flip (&d) != LEFT);
+
+ Offset my_z (me->relative_coordinate (commonx, X_AXIS), 0);
+
+ span_points[LEFT] -= my_z;
+ span_points[RIGHT] -= my_z;
+
+ Stencil line = line_stencil (me,
+ span_points[LEFT],
+ span_points[RIGHT]);
+
+
+ return line.smobbed_copy ();
+}
+
+ADD_INTERFACE (New_line_spanner,
+ "Generic line drawn between two objects, e.g. for use with glissandi.\n"
+ "The property @code{style} can be @code{line}, "
+ "@code{dashed-line}, @code{trill}, \n"
+ "@code{dotted-line} or @code{zigzag}.\n"
+ "\n",
+
+ "extra-dy "
+ "arrow "
+ "gap "
+ "thickness "
+ "zigzag-length "
+ "zigzag-width "
+ );
+
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