How to fill region on Folium of Descartes like this:

![enter image description here](https://i.stack.imgur.com/KMJWi.gif)

Here is my codes:

```
\documentclass[10pt]{article}
\usepackage{pstricks-add}
\usepackage{pst-func}
\pagestyle{empty}

\begin{document}

\begin{figure}[!ht]
\centering
\psset{algebraic=true,dimen=middle,dotstyle=o,linewidth=0.8pt,arrowsize=3pt 2,arrowinset=0.25,unit=4}
\begin{pspicture*}(-.5,-.5)(2,2)
\psaxes[linecolor=gray,xAxis=true,yAxis=true,labels=none,ticks=none]{->}(0,0)(-.5,-.5)(2,2)
\psplotImp[linecolor=blue,linewidth=1.5pt,plotpoints=500](0,0)(2,2){y^3-3*x*y+x^3}

\end{pspicture*}
\caption{Folium Descartes}
\end{figure}

\end{document}

```