/*
  slur.cc -- implement external interface for Slur

  source file of the GNU LilyPond music typesetter

  (c) 1996--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
  Jan Nieuwenhuizen <janneke@gnu.org>
*/


#include <math.h>

#include "beam.hh"
#include "bezier.hh"
#include "directional-element-interface.hh"
#include "font-interface.hh"
#include "group-interface.hh"
#include "lily-guile.hh"
#include "lookup.hh"
#include "main.hh"
#include "note-column.hh"
#include "output-def.hh"
#include "rod.hh"
#include "slur.hh"
#include "spanner.hh"
#include "staff-symbol-referencer.hh"
#include "staff-symbol.hh"
#include "stem.hh"
#include "stencil.hh"
#include "text-item.hh"
#include "warn.hh"

MAKE_SCHEME_CALLBACK (Slur, height, 2);
SCM
Slur::height (SCM smob, SCM ax)
{
  Axis a = (Axis)scm_to_int (ax);
  Grob *me = unsmob_grob (smob);
  assert (a == Y_AXIS);

  SCM mol = me->get_uncached_stencil ();
  Interval ext;
  if (Stencil *m = unsmob_stencil (mol))
    ext = m->extent (a);
  return ly_interval2scm (ext);
}

/*
  Ugh should have dash-length + dash-period
*/
MAKE_SCHEME_CALLBACK (Slur, print,1);
SCM
Slur::print (SCM smob)
{
  Grob *me = unsmob_grob (smob);
  if (!scm_ilength (me->get_property ("note-columns")))
    {
      me->suicide ();
      return SCM_EOL;
    }

  Real base_thick = robust_scm2double (me->get_property ("thickness"), 1);
  Real thick = base_thick * Staff_symbol_referencer::line_thickness (me);

  Real ss = Staff_symbol_referencer::staff_space (me);
  Bezier one = get_curve (me);

  Stencil a;

  /*
    TODO: replace dashed with generic property.
  */
  SCM d =  me->get_property ("dashed");
  if (scm_is_number (d))
    a = Lookup::dashed_slur (one, thick, thick * robust_scm2double (d, 0));
  else
    a = Lookup::slur (one, get_grob_direction (me) * base_thick * ss / 10.0,
		      thick);

#if DEBUG_SLUR_QUANTING
  SCM quant_score = me->get_property ("quant-score");

  if (to_boolean (me->get_paper ()
		  ->lookup_variable (ly_symbol2scm ("debug-slur-quanting")))
      && scm_is_string (quant_score))
    {
      String str;
      SCM properties = Font_interface::text_font_alist_chain (me);

      Stencil tm = *unsmob_stencil (Text_item::interpret_markup
				    (me->get_paper ()->self_scm (), properties,
				     quant_score));
      a.add_at_edge (Y_AXIS, get_grob_direction (me), tm, 1.0, 0);
    }
#endif

  return a.smobbed_copy ();
}


Bezier
Slur::get_curve (Grob*me)
{
  Bezier b;
  int i = 0;
  for (SCM s = me->get_property ("control-points"); s != SCM_EOL;
       s = ly_cdr (s))
    b.control_[i++] = ly_scm2offset (ly_car (s));

  return b;
}

void
Slur::add_column (Grob*me, Grob*n)
{
  Pointer_group_interface::add_grob (me, ly_symbol2scm ("note-columns"), n);
  add_bound_item (dynamic_cast<Spanner*> (me), dynamic_cast<Item*> (n));
}


void
Slur::add_extra_encompass (Grob*me, Grob*n)
{
  Pointer_group_interface::add_grob (me, ly_symbol2scm ("encompass-objects"), n);
}



MAKE_SCHEME_CALLBACK (Slur, outside_slur_callback, 2);
SCM
Slur::outside_slur_callback (SCM grob, SCM axis)
{
  Grob *script = unsmob_grob (grob);
  Axis a = Axis (scm_to_int (axis));
  assert (a == Y_AXIS);

  Grob *slur = unsmob_grob (script->get_property ("slur"));

  if (!slur)
    return scm_from_int (0);
  
  Grob *cx = script->common_refpoint (slur, X_AXIS);
  Grob *cy = script->common_refpoint (slur, Y_AXIS);

  Bezier curve = Slur::get_curve (slur);

  curve.translate (Offset (slur->relative_coordinate (cx, X_AXIS),
			   slur->relative_coordinate (cy, Y_AXIS)));

  Interval yext = robust_relative_extent (script, cy, Y_AXIS);
  Interval xext = robust_relative_extent (script, cx, X_AXIS);


  Real slur_padding = 0.2;	// todo: slur property, script property?
  yext.widen (slur_padding);
  
  Interval bezext (curve.control_[0][X_AXIS],
		   curve.control_[3][X_AXIS]);

  Real x = xext.center ();
  if (!bezext.contains (xext[RIGHT]))
    x = xext[LEFT];
  else if (!bezext.contains (xext[LEFT]))
    x = xext[RIGHT];

  
  if (!bezext.contains (x))
    return scm_make_real (0);

  Real y = curve.get_other_coordinate (X_AXIS, x);
  if (yext.contains (y)) 
    {
      Direction dir = get_grob_direction (script); 
      return scm_make_real (y - yext[-dir] + dir * slur_padding);
    }
  return scm_make_real (0.0);
}


ADD_INTERFACE (Slur, "slur-interface",
	       "A slur",
	       "quant-score excentricity encompass-objects control-points dashed slur-details direction height-limit note-columns ratio thickness");

