On Tue, 9 Feb 2010, Matthew Kenworthy wrote:

> Tim,
>
> That's not a problem if we step away from trying to implement axis labelling
>> in each subsystem. The AST library
>>
>>  http://starlink.jach.hawaii.edu/starlink/AST
>>
>> is a generalised coordinate library but more importantly it includes a
>> generic plotting interface.
>>
>
> The issue (as I understand it) with PGPLOT is that its license is not free
> enough for several Linux distributions.

The PGPLOT issue is interesting in that Starlink were given a licence to 
use and distribute PGPLOT but no-one can find the paperwork from 20 years 
ago :-) That's just a sidetrack though. The point being that, for example, 
the Starlink::AST perl module can create plots for PGPLOT, PLplot and Tk 
without any code changes at the user level once the device is created.

>  If the licensing is anything but
> 'free' for the AST library, then any plotting built with AST will have the
> same problem as PGPLOT. Do you know if the ASt licensing is acceptable to
> all Linux distributions?
>

It's GPL. We own the code so we can be reasonably flexible 
on this (although probably not Artistic).

-- 
Tim Jenness
JAC software
http://www.jach.hawaii.edu/~timj


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