\documentclass[crop=true,border=5pt]{standalone}
\usepackage[T1]{fontenc}
\usepackage{libertine}
\usepackage[libertine]{newtxmath}
\input macroperso.tex
\begin{document}
\def\mandeltest#1#2{%
       \def\zx{0}\def\zy{0}%
       \def\zxx{0}\def\zyy{0}%
       \def\mandelresult{1}%
       \for\ii=1to\maxiter\do1{%
               \advance\count255 by1
               \edef\zy{\dimtodec\dimexpr\decmul{\decmul2\zx}\zy pt+#2pt\relax}%
               \edef\zx{\dimtodec\dimexpr\zxx pt-\zyy pt+#1pt\relax}%
               \edef\zxx{\decmul\zx\zx}%
               \edef\zyy{\decmul\zy\zy}%
               \ifdim\dimexpr\zxx pt+\zyy pt\relax>4pt
                       \def\mandelresult{0}%
                       \exitfor\ii
               \fi
       }%
}
\def\mandel#1#2{%
       \graphzone{-2}[1]{1}[2]{-1}[1]{1}[2]{%
               \def\maxiter{#2}%
               \edef\plotstuff{\the\dimexpr\xunit/#1\relax}%
               \edef\plotstuff{\vrule height\plotstuff width\plotstuff}%
               \edef\increment{\decdiv{1}{#1}}%
               \count255=0
               \FOR\xxx = -2 to 1 \do \increment{%
                       \FOR\yyy = 0 to 1 \do \increment{%
                               \mandeltest\xxx\yyy
                               \ifnum\mandelresult=1
                                       \plot(\xxx,\yyy)\plot(\xxx,-\yyy)%
                               \fi
                       }%
               }%
       \edef\plotstuff{$\scriptstyle\number\count255 $}%
       \plot(-1.99,0.92)%
       }%
}
\xunit=3cm \yunit=3cm \mandel{400}{500}
\end{document}

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