Gielis' Superformula

This is my at rendering Giellis' Superformula. Think I might have got it wrong a bit.
If
you have any suggestions, please let me know.

A:

I think you are looking for something like this:
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}[
  every node