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

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

std::string sfmt(const std::string& msg)
{
#ifdef SANSSERIF
  return "$\\mathsf{"+msg+"}$";
#else
  return "$"+msg+"$";
#endif
}
/*
void ray(const P& tail, const P& head, double s)
{
  line(tail, tail + (1+0.01*s)*(head-tail));
}
*/

P f(double t)
{
  return P(0.75*t*t, t);
}

P ptQ(f(0)), ptP(f(1)), ptV(f(0.5)), ptM(0.5*(ptQ+ptP));

int main()
{
  picture(P(0,0), P(0.75,1), "2.25 x 3in");

  begin();

  plot(f, -0.125, 1.05, 40);

  triangle(ptQ, ptP, ptV);
  line(ptV, ptM);

  label(ptQ, -LdX, sfmt("Q"), l);
  label(ptV, -LdX, sfmt("V"), l);
  label(ptP,  LdY, sfmt("P"), t);

  label(ptM,  LdX, sfmt("M"), r);

  tikz_format();
  end();
}