As you have experienced the incompatibility between
pdflatex and
pstricks by yourself, I don't have to explain that. But I can offer you an alternative called
pst-pdf. So change your example at a few points to make it work.
Code: Select all
\documentclass{article}
\usepackage{pst-pdf,pst-text,pstricks-add}
\begin{document}
\begin{center}
\psset{linecolor=lightgray}
\begin{pspicture}[showgrid=true](-5,-3)(5,3)
\pstextpath[c]{\pscurve(-5,0)(-2.5,-2)(0,2)(2.5,-2)(5,0)}
{\color{blue}\large Esta frase sinuosa y peculiar est\'a escrita a lo largo de la curva $y=x^4-2x^2$}
\end{pspicture}
\end{center}
\end{document}
But that's only the half way to get the result in PDF. The
pst-pdf package needs some more processing to get all things right. This can be done by a special build profile I generated some time ago for a similar problem in a German forum. Details about the processing of a document can be read in the documentation of the package. I called the profile "LaTeX => pst-pdf => PDF". You can find it in the attachment. Note that you have to adapt the paths to all required binaries. The build profile was created on a German system. So, be very careful in your path adaptation. Otherwise the profile won't work. To import the profile, unzip the archive and go to the "Profiles" dialog (Alt+F7) in TeXnicCenter.
If you are very new in using such graphics packages, you could take a look at the
pgf/tikz package. But as far as I know, it doesn't provide the feature of writing text on a path. On the other side it creates both PS and PDF output.
Best regards an welcome on Board
Thorsten