[pstricks] Re: Hyperbolas

[Herbert Voss]

Jacques L'helgoualc'h wrote:

> \makeatletter
> \def\psthyperbola{\pst at object{psthyperbola}}
> \def\psthyperbola at i#1#2{%

it maybe a good idea to gave a \hyperbola with an optional
origin:

\def\psthyperbola{\pst at object{psthyperbola}}
\def\psthyperbola at i{\@ifnextchar({\psthyperbola at ii}{\psthyperbola at ii(0,0)}}
\def\psthyperbola at ii(#1,#2)#3#4{
...


then we can have something like
\psthyperbola[linecolor=blue]{1}{3 sqrt}% a b
\psthyperbola[linecolor=blue](1,-1){1}{3 sqrt}% a b


Herbert


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