prologues:=3;

if scantokens(mpversion) > 1.005:
  outputtemplate :=
else:
  filenametemplate
fi
"%j.mps";

verbatimtex
%&latex
\documentclass[11pt]{article}
\usepackage[charter]{mathdesign}
\usepackage[T1]{fontenc}
\renewcommand*{\ttdefault}{lmtt}
\begin{document}
etex

beginfig(0);
	% Set unit size to 108pt = 3/2in
	u:=72;
	v:=2*u/(1+sqrt(5));

	% Determine the size of the default font
	w:=fontsize defaultfont;

	% Draw the parabola
	draw (-u,2*v){dir -angle(1*u,4*v)}..(-u/2,v/2){dir -angle(1*u,2*v)}..(0,0){right}..(u/2,v/2){dir angle(1*u,2*v)}..(u,2*v){dir angle(1*u,4*v)} withcolor red withpen pencircle scaled 1bp;

	% Label f(x)
	label.lft(btex $f(x)=x^2$ etex,(sqrt(3)/2*u,3/2*v));
	
	% Draw x and y axes arrows
	drawarrow (-u,0)--(u+w/2,0);
	drawarrow (0,0)--(0,2*v+w/2);
	
	% Label the x and y axes
	label.rt(btex $x$ etex,(u+w/2,0));
	label.top(btex $y$ etex,(0,2*v+w/2));

	% Pad left size to horizontally center figure
	label.lft(btex $\phantom{x}$ etex,(-u-w/2,0));

endfig;
end