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

const double dx(0.333);
double rad(0.45*(2 - dx));
const double m(sqrt(1.0/3));

int main()
{
  picture(P(0,0), P(2,1.25), "2.5 x 1.5625in");

  begin();
  cme_init();
  P O(0,0);

  triangle(O, P(2,0), P(2, 2*m));
  line(P(2 - dx, 0), P(2 - dx, m*(2 - dx)));
  line(P(2 - dx, m*(2 - dx)), P(2, m*(2 - dx)));

  label(P(1 - 0.5*dx, 0), P(0,-4), "$x$", b);
  label(P(2 - 0.5*dx, 0), P(0,-4), "$dx$", b);

  label(P(2 - dx, 0.5*m*(2 - dx)), P(-4, 0), "$y$", l);
  label(P(2, 0.5*m*(2 - dx)), P(4,0), "$y$", r);

  label(P(2, m*(2 - 0.5*dx)), P(4,0), "$dy$", r);

  label(polar(rad, 15), P(2,0), "$30°$", tr);
  bold();
  cme_dashed();
  arc_arrow(O, rad, 15, 30);
  arc_arrow(O, rad, 15, 0);

  caption("Fig.~4.");
  tikz_format();
  end();
}