/* -*-ePiX-*- */
#include "epix.h"
using namespace ePiX;

int main()
{
  picture(P(-1,-1), P(1,1), "3.5 x 3.5in");

  begin();

  label(P(0, ymin()), P(0,-8), "\\textsc{Fig.~3.}", b);

  /*
  arrow_inset(0.5);
  arrow_width(5);
  arrow_ratio(2.5);
  */

  const double MAX(0.9);
  const double X1(-0.4);

  bold();
  P O(0,0), U1(MAX,MAX), U2(-U1), V1(-MAX,MAX), V2(-V1);
  P T(0,ymax()), X(xmax()), P1(X1, 0.5*(1+MAX)), P2(X1,0.1), N(X1,-X1);

  line(U1, U2);
  line(V1, V2);

  line(-T, T);
  line(-X, X);

  dashed();
  line(P1, P2);

  font_size("footnotesize");
  label(O, P(-12,-4), "$O$", bl);
  label(X, P(4), "$X$", r);
  label(T, P(4), "$T$", r);

  label(U1, P( 2,2),  "$U$", tr);
  label(U2, P(-2,2), "$U'$", tl);

  label(V1, P( 2,2),  "$V$", tr);
  label(V2, P( 2,2), "$V'$", tr);

  dot(P1, P(4),  "$P$", r);
  dot(P2, P(4), "$P'$", r);

  label(N, P(2,2), "$N$", tr);

  tikz_format();
  end();
}