Thanks very much.  asymptote's function is very much like tikz . I can use asymptote.
Besides asymptote, I can use metapost.

2009/8/17 Eric Schulte <schulte.eric@gmail.com>
Sorry,

Please disregard this email, I didn't realize tikz/pgf was a package of
TeX macros and not an external tool. -- Eric

"Eric Schulte" <schulte.eric@gmail.com> writes:

> Hi,
>
> Adding support for a new block type is fairly easy for any tool that can
> be called from the command line.  If you would like to try this please
> read the documentation of org-exp-blocks on worg [1] and follow the
> example of the asymptote block type [2].
>
> Best -- Eric
>
> Footnotes:
> [1]  http://orgmode.org/worg/org-contrib/org-exp-blocks.php
>
> [2]  http://orgmode.org/worg/org-contrib/org-exp-blocks.php#sec-4.1