[pstricks] Re: Hyperbolas
Jacques L'helgoualc'h
lhh+nospam at free.fr
Mon Feb 7 10:08:40 CET 2005
Herbert Voss a écrit, lundi 7 février 2005, à 08:09 :
[...]
> \def\psthyperbola at ii#1#2#3#4{% a b -1/+1 -1/+1
> \parametricplot{0}{6.28}{%
> /a #1 def /b #2 def
> a t COSH mul #3 mul b t SINH mul #4 mul}
> }
I suggest rational parameters (quicker, and maybe a better plotpoints
repartition)
\def\psthyperbola at ii#1#2#3#4{% a b -1/+1 -1/+1
\parametricplot{0}{.99}{%
/a #1 def /b #2 def
/d {1 t dup mul sub} bind def
a t dup mul 1 add d div mul #3 mul
b t 2 mul d div mul #4 mul}
}
--
Jacques L'helgoualc'h
More information about the PSTricks
mailing list