Playing with Colors

[Han]

Is it possible to request a list of supported packages? (It appears the \require{} command is similar to \usepackage{}.) Let's try:

\[ \require{pst-plot}
\psset{xunit=8mm,yunit=8mm}
\begin{pspicture}(-1.5,-2.5)(4,6)
\psaxes[labels=none,ticks=none](0,0)(-1.5,-2.5)(4,5.5)
\psplot[linecolor=red, linewidth=1pt]%
{-1.5}{3.5}{x x mul 2 x mul sub}
\psdot(-1,3) \uput[r](-1,3){$P=(-1,\hspace{5mm})$}
\psdot(1,-1) \uput[r](1,-1){$Q=(\hspace{5mm},-1)$}
\uput[u](2,-2.5){$f(x)=x^2-2x$}
\end{pspicture}
\]

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Oh well, was worth the shot