[pstricks] Naive question

[José Emilio Vila Forcén]

Hello all,

  I am starting to write a latex package, and I am very interested in 
the answers of this thread: Could you give me a hint to understand how 
to write a package?

  In fact, I have several macros with pst-plot already working, but I 
would like to be able to have 'options' for them. Instead of defining 
something like:

\newcommand{macroname}[2][red]{color = #1, linewidth=#2 pt}
and using it as
\macroname[red]{2}

What should I write in order to be able to use it as:

\macroname[color=red, linewidth=2pt]{ ---- }.....
            ^^^^^^^^^^^^^^^^^^^^^^^^

which is much more flexible.

Thank you very much for your time
Jose