source file of the GNU LilyPond music typesetter
- (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
+ (c) 2000--2006 Jan Nieuwenhuizen <janneke@gnu.org>
*/
-#include "molecule.hh"
-#include "item.hh"
-#include "spanner.hh"
#include "line-spanner.hh"
-#include "paper-def.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"
+
+Stencil
+zigzag_stencil (Grob *me,
+ Offset from,
+ Offset to)
+{
+ Offset dz = to -from;
+
+ Real thick = Staff_symbol_referencer::line_thickness (me);
+ thick *= robust_scm2double (me->get_property ("thickness"), 1.0); // todo: staff sym referencer?
+
+ Real staff_space = Staff_symbol_referencer::staff_space (me);
+
+ Real w = robust_scm2double (me->get_property ("zigzag-width"), 1) * staff_space;
+ int count = (int) ceil (dz.length () / w);
+ w = dz.length () / count;
+ Real l = robust_scm2double (me->get_property ("zigzag-length"), 1) * w;
+ Real h = l > w / 2 ? sqrt (l * l - w * w / 4) : 0;
+
+ Offset rotation_factor = complex_exp (Offset (0, dz.arg ()));
+
+ Offset points[3];
+ points[0] = Offset (0, -h / 2);
+ points[1] = Offset (w / 2, h / 2);
+ points[2] = Offset (w, -h / 2);
+ for (int i = 0; i < 3; i++)
+ points[i] = complex_multiply (points[i], rotation_factor);
+
+ Stencil squiggle (Line_interface::make_line (thick, points[0], points[1]));
+ squiggle.add_stencil (Line_interface::make_line (thick, points[1], points[2]));
+
+ Stencil total;
+ for (int i = 0; i < count; i++)
+ {
+ Stencil moved_squiggle (squiggle);
+ moved_squiggle.translate (from + Offset (i * w, 0) * rotation_factor);
+ total.add_stencil (moved_squiggle);
+ }
+
+ Box b;
+ b.add_point (Offset (0, 0));
+ b.add_point (dz);
+ b[X_AXIS].widen (thick / 2);
+ b[Y_AXIS].widen (thick / 2);
+
+ return Stencil (b, total.expr ());
+}
+
+MAKE_SCHEME_CALLBACK (Line_spanner, after_line_breaking, 1);
SCM
-Line_spanner::line_atom (Grob* me, Real dx, Real dy)
+Line_spanner::after_line_breaking (SCM g)
{
- SCM list = SCM_EOL;
- SCM type = me->get_grob_property ("type");
- if (gh_symbol_p (type)
+ 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)
+{
+ 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 ("dotted-line")
+ || type == ly_symbol2scm ("zigzag")
+ || (type == ly_symbol2scm ("trill") && dz[Y_AXIS] != 0)))
{
- Real staff_space = Staff_symbol_referencer::staff_space (me);
- Real thick = me->paper_l ()->get_var ("stafflinethickness");
-
- SCM s = me->get_grob_property ("line-thickness");
- if (gh_number_p (s))
- thick *= gh_scm2double (s);
-
- // maybe these should be in line-thickness?
- Real length = staff_space;
- s = me->get_grob_property ("dash-length");
- if (gh_number_p (s))
- length = gh_scm2double (s) * staff_space;
-
- Real period = 2 * length + thick;
- s = me->get_grob_property ("dash-period");
- if (gh_number_p (s))
- period = gh_scm2double (s) * staff_space;
-
- if (type == ly_symbol2scm ("dotted-line"))
- length = thick;
-
- if (type == ly_symbol2scm ("line"))
- length = period + thick;
-
- Real on = length - thick;
- Real off = period - on;
-
- list = gh_list (ly_symbol2scm ("dashed-line"),
- gh_double2scm (thick),
- gh_double2scm (on),
- gh_double2scm (off),
- gh_double2scm (dx),
- gh_double2scm (dy),
- SCM_UNDEFINED);
+ line = (type == ly_symbol2scm ("zigzag"))
+ ? zigzag_stencil (me, from, to)
+ : Line_interface::line (me, from, to);
}
- return list;
+ 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, 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;
}
+/*
+ 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 molecule_extent. At this point, the staffs aren't
+ 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, brew_molecule, 1);
+MAKE_SCHEME_CALLBACK (Line_spanner, print, 1);
SCM
-Line_spanner::brew_molecule (SCM smob)
+Line_spanner::print (SCM smob)
{
- Grob *me= unsmob_grob (smob);
- Spanner *spanner = dynamic_cast<Spanner*> (me);
+ Spanner *me = dynamic_cast<Spanner *> (unsmob_grob (smob));
- Grob *common[] = { 0, 0 };
+ Drul_array<Item *> bound (me->get_bound (LEFT),
+ me->get_bound (RIGHT));
- Item *l = spanner->get_bound (LEFT);
- Item *r = spanner->get_bound (RIGHT);
+ Real gap = robust_scm2double (me->get_property ("gap"), 0.0);
- /*
- FIXME: should also do something sensible across line breaks.
- */
- if (l->break_status_dir () || r->break_status_dir ())
- return SCM_EOL;
-
- for (Axis a = X_AXIS; a < NO_AXES; a = Axis (a + 1))
+ Offset ofxy (gap, 0); /* offset from start point to start of line */
+ Offset dxy;
+ Offset my_off;
+ Offset his_off;
+
+ if (bound[RIGHT]->break_status_dir ())
{
- common[a] = l->common_refpoint (r, a);
-
- if (!common[a])
- return SCM_EOL;
+ 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.
+ */
+
+ int k = broken_spanner_index (me);
+ Spanner *parent_sp = dynamic_cast<Spanner *> (me->original ());
+ Spanner *next_sp = parent_sp->broken_intos_ [k + 1];
+ 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);
+ Offset p2 (bound[RIGHT]->extent (commonx, X_AXIS)[LEFT],
+ next_ext.center () + yoff);
+
+ 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 ();
}
-
- Offset dxy ;
- for (Axis a = X_AXIS; a < NO_AXES; a = Axis (a + 1))
+ else
{
- dxy[a] = r->extent (common[a], a)[LEFT] -
- l->extent (common[a], a)[RIGHT];
+ 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;
+
+ 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);
+ return line.smobbed_copy ();
}
-
- Molecule line;
- Real gap = gh_scm2double (me->get_grob_property ("gap"));
-
- Offset my_off(me->relative_coordinate (common[X_AXIS], X_AXIS),
- me->relative_coordinate (common[Y_AXIS], Y_AXIS) );
-
- Offset his_off(l->relative_coordinate (common[X_AXIS], X_AXIS),
- l->relative_coordinate (common[Y_AXIS], Y_AXIS) );
-
- dxy *= (dxy.length () - 2 * gap) / dxy.length ();
-
- SCM list = Line_spanner::line_atom (me, dxy[X_AXIS], dxy[Y_AXIS]);
-
- if (list == SCM_EOL)
- return SCM_EOL;
-
- Box b (Interval (0, dxy[X_AXIS]), Interval (0, dxy[Y_AXIS]));
-
- line = Molecule (b, list);
- line.translate_axis (l->extent (l, X_AXIS).length (), X_AXIS);
-
-
- Offset g = dxy * (gap / dxy.length ());
- line.translate (g - my_off + his_off);
-
- return line.smobbed_copy ();
}
+ADD_INTERFACE (Line_spanner, "line-spanner-interface",
+ "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",
+ "gap zigzag-width zigzag-length thickness arrow");
projects / lilypond.git / blobdiff