% Steve's macro for drawing big circles
%
% Works in picture or math modes

\usepackage{fltpoint}       % used to do arithmetic within LaTeX code.
\usepackage{bez123}         % used to draw more compolicated bezier curves
\fpDecimalSign{.}

% bigcircle parameters are x,y,r.  They must be entered as decimals.
% ex: Enter 5 as 5.0, .3 as 0.3, etc.
\newcounter{bck}
\newcounter{bcx} \newcounter{bcy}
\newcounter{bcxmr} \newcounter{bcxpr}
\newcounter{bcymr} \newcounter{bcypr}
\newcounter{bcxmk} \newcounter{bcxpk}
\newcounter{bcymk} \newcounter{bcypk}
\newcommand{\bigcircle}[3]{ \fpMul{\bck}{0.5522847498}{#3}
    \fpSub{\bcxmr}{#1}{#3} \fpAdd{\bcxpr}{#1}{#3}
    \fpSub{\bcymr}{#2}{#3} \fpAdd{\bcypr}{#2}{#3}
    \fpSub{\bcxmk}{#1}{\bck} \fpAdd{\bcxpk}{#1}{\bck}
    \fpSub{\bcymk}{#2}{\bck} \fpAdd{\bcypk}{#2}{\bck}
    \fpAdd{\bcx}{#1}{0.0} \fpAdd{\bcy}{#2}{0.0}
    \cbezier(\bcxmr,\bcy)(\bcxmr,\bcypk)(\bcxmk,\bcypr)(\bcx,\bcypr)
    \cbezier(\bcx,\bcypr)(\bcxpk,\bcypr)(\bcxpr,\bcypk)(\bcxpr,\bcy)
    \cbezier(\bcxpr,\bcy)(\bcxpr,\bcymk)(\bcxpk,\bcymr)(\bcx,\bcymr)
    \cbezier(\bcx,\bcymr)(\bcxmk,\bcymr)(\bcxmr,\bcymk)(\bcxmr,\bcy) }
% *********  End graphics macros  *********