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

const P LdY(0, 4);
const P LdX(4, 0);

const P ptB(cis(M_PI/3));
const P ptC(cis(2*M_PI/3));

std::string sfmt(const std::string& msg)
{
#ifdef SANSSERIF
  return "$\\mathsf{"+msg+"}$";
#else
  return "$"+msg+"$";
#endif
}

int main()
{
  picture(P(-1,-0.5), P(1.25,1), "4 x 2.666in");

  begin();

  quad(P(1,0), ptB, ptC, P(-1,0));

  arc(P(0,0), 1, 0, M_PI);

  pen(2);

  line(P(0,0), P(1,0));
  arc(P(0,0), 1, 0, M_PI/3);
  arc(P(0.5,0), 0.5, -M_PI, 0);
  arc(0.5*(P(1,0) + ptB), 0.5, -M_PI/3, 2*M_PI/3);

  label(P(-1, 0), -LdY, sfmt("D"), b);
  label(P( 1, 0), 0.5*(LdX-LdY), sfmt("A"), br);
  label(P( 0, 0), -LdX-LdY, sfmt("O"), bl);

  label(ptB,  LdY, sfmt("B"), t);
  label(ptC,  0.5*(-LdX+LdY), sfmt("C"), t);

  label(cis(M_PI/6), 0.5*(LdX+LdY), sfmt("F"), tr);
  label(polar(0.5*(1+sqrt(3)), M_PI/6), 0.5*(LdX+LdY), sfmt("E"), tr);

  tikz_format();
  end();
}