-/*
- line-spanner.cc -- implement Line_spanner
-
- source file of the GNU LilyPond music typesetter
-
- (c) 2000--2007 Jan Nieuwenhuizen <janneke@gnu.org>
-*/
-
-#include "line-spanner.hh"
-
-
-#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"
-
-MAKE_SCHEME_CALLBACK (Line_spanner, after_line_breaking, 1);
-SCM
-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
-Line_spanner::line_stencil (Grob *me,
- Offset from,
- Offset to)
-{
- Stencil line = Line_interface::line (me, from, to);
-
- if (to_boolean (me->get_property ("arrow")))
- line.add_stencil (Line_interface::arrows (me, from, to, false, true));
-
- return line;
-}
-
-/*
- Find a common Y parent, which --if found-- should be the
- fixed-distance alignment.
-*/
-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;
-}
-
-/*
- Warning: this thing is a cross-staff object, so it should have empty Y-dimensions.
-
- (If not, you risk that this is called from the staff-alignment
- routine, via stencil_extent. At this point, the staves aren't
- separated yet, so it doesn't work cross-staff.
-
- (huh? crossable staves have fixed distance? --hwn)
-*/
-
-MAKE_SCHEME_CALLBACK (Line_spanner, print, 1);
-SCM
-Line_spanner::print (SCM smob)
-{
- Spanner *me = dynamic_cast<Spanner *> (unsmob_grob (smob));
-
- Drul_array<Item *> bound (me->get_bound (LEFT),
- me->get_bound (RIGHT));
-
- Real gap = robust_scm2double (me->get_property ("gap"), 0.0);
-
- Offset ofxy (gap, 0); /* offset from start point to start of line */
- Offset dxy;
- Offset my_off;
- Offset his_off;
-
- Real extra_dy = robust_scm2double (me->get_property ("extra-dy"),
- 0.0);
-
- if (bound[RIGHT]->break_status_dir ())
- {
- if (bound[LEFT]->break_status_dir ())
- {
- programming_error ("line-spanner with two broken ends. Farewell sweet world.");
-
- me->suicide ();
- return SCM_EOL;
- }
-
- /*
- 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 (RIGHT);
- Item *next_bound = next_sp->get_bound (RIGHT);
-
- if (next_bound->break_status_dir ())
- {
- programming_error ("no note heads for the line spanner on next line?"
- " Confused.");
- me->suicide ();
- return SCM_EOL;
- }
-
- Grob *commonx = bound[LEFT]->common_refpoint (bound[RIGHT], X_AXIS);
- commonx = me->common_refpoint (commonx, X_AXIS);
-
- Grob *next_common_y = line_spanner_common_parent (next_bound);
- Grob *this_common_y = line_spanner_common_parent (bound[LEFT]);
-
- Grob *all_common_y = me->common_refpoint (this_common_y, Y_AXIS);
-
- Interval next_ext = next_bound->extent (next_common_y, Y_AXIS);
- Interval this_ext = bound[LEFT]->extent (this_common_y, Y_AXIS);
-
- Real yoff = this_common_y->relative_coordinate (all_common_y, Y_AXIS);
-
- Offset p1 (bound[LEFT]->extent (commonx, X_AXIS)[RIGHT],
- this_ext.center () + yoff - extra_dy / 2);
- Offset p2 (bound[RIGHT]->extent (commonx, X_AXIS)[LEFT],
- next_ext.center () + yoff + extra_dy / 2);
-
- Offset dz (p2 - p1);
- Real len = dz.length ();
-
- Offset dir = dz * (1 / len);
- dz = (dz.length () - 2 * gap) * dir;
-
- Stencil l (line_stencil (me, Offset (0, 0), dz));
-
- l.translate (dir * gap + p1
- - Offset (me->relative_coordinate (commonx, X_AXIS),
- me->relative_coordinate (all_common_y, Y_AXIS)));
-
- return l.smobbed_copy ();
- }
- else
- {
- Grob *common[] = { me, me };
- for (int a = X_AXIS; a < NO_AXES; a++)
- {
- common[a] = me->common_refpoint (bound[RIGHT], Axis (a));
- common[a] = common[a]->common_refpoint (bound[LEFT], Axis (a));
- }
-
- // distance from center to start of line
- Real off = gap + ((bound[LEFT]->extent (bound[LEFT], X_AXIS).length () * 3) / 4);
-
- for (int a = X_AXIS; a < NO_AXES; a++)
- {
- Axis ax = (Axis)a;
- dxy[ax]
- = + robust_relative_extent (bound[RIGHT], common[X_AXIS], ax).center ()
- - robust_relative_extent (bound[LEFT], common[X_AXIS], ax).center ();
-
- my_off[ax] = me->relative_coordinate (common[a], ax);
- his_off[ax] = bound[LEFT]->relative_coordinate (common[a], ax);
- }
-
- ofxy = dxy * (off / dxy.length ()) ;
- dxy -= 2*ofxy;
-
- dxy[Y_AXIS] += extra_dy;
-
- Stencil line = line_stencil (me, Offset (0, 0), dxy);
-
- line.translate_axis (bound[LEFT]->extent (bound[LEFT], X_AXIS).length () / 2, X_AXIS);
- line.translate (ofxy - my_off + his_off + Offset (0, -extra_dy/2));
- return line.smobbed_copy ();
- }
-}
-
-ADD_INTERFACE (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 "
- );
-
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