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

double f(double x)
{
  return x/3;
}

int main()
{
  picture(P(-2.5,-1), P(13.5,7), "3.2 x 1.6in");

  begin();
  cme_bold();
  fill(Black(0.05));
  rect(P(3,0), P(6,1));
  rect(P(6,0), P(9,2));
  rect(P(9,0), P(12,3));
  fill(false);

  h_axis_labels(P(3,0), P(12,0), 3, P(0,-4), b);
  v_axis_labels(P(0,1), P(0,5), 4, P(-4,0), l);

  clip_box(P(0,0,-1), P(12.5,5.5,1));
  plain();
  grid(P(0,0), P(13,6), 13, 6);
  clip_box();

  pen(2);
  white();
  line(P(0,5.5), P(12.5,5.5));
  line(P(12.5,0), P(12.5,5.5));
  cme_bold();
  black();

  axis_labels("", "$x$", "$y$");
  label(P(0,0), P(-2,-6), "$O$", bl);
  axes();
  plot(f, -2.5, 12, 1);

  caption("Fig.~54.");
  tikz_format();
  end();
}