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

P f(double t)
{
  return P(0.5*t*(0.1 + t*t - 0.01*Sin(40*t)), t);
}

int main()
{
  picture(P(-1,-1), P(1,1), "2.5 x 2.5in");

  begin();

  double mm(-0.5), ht(0.75), tmax(0.5);
  P O(0, 0), NE(1, 1), SE(1, -1), NW(-1, 1), SW(-1, -1), pt(1, mm);

  fill();
  black(0.3);
  triangle(SW, SE, O);

  black(0.15);
  triangle(NE, NW, O);

  bold();
  black();
  nofill();
  line(NW, SE);
  line(NE, SW);

  plain();
  plot(f, -tmax, tmax, 40);
  v_axis_tick(f(-tmax));
  v_axis_tick(f(tmax));

  dashed();
  dash_size(6);
  line(pt, -pt);

  label(pt, P(-2, -2), "$t = 0$", bl);
  circ(O, P(6, -2), "$O$", tr);

  label(P(0, ht), P(0, 4), "\\textit{Active future.}", t);
  label(P(0,-ht), P(0,-4), "\\textit{Passive past.}", b);

  label(P(0.5*(xmin() + xmax()), ymin()), P(0, -24), "\\textsc{Fig.~10.}", b);
  tikz_format();
  end();
}