Re: plugins: possibility to define new data type/format

[Jean Bréfort <jean brefort normalesup org>]

Le jeudi 21 janvier 2010 à 17:50 -0800, RLa a écrit :
> Have a good evening,
>
> As an astronomer, I need to enter coordinates in the classical sexagesimal
> format using degrees (0 to 360 with 1/60 and 1/3600 divisions) or angle
> hours (0 to 24 with 1/60 and 1/3600 divisions, that's right ascension). 
> Using "time" format with "[HH]:mm:ss" is OK, until one has to use
> trigonometric functions to perform spherical trigonometry... then you have
> to multiply by 180/pi() or 12/pi() in each call to a trigonometric function,
> and not to get confused between declination (180/pi) and right ascension
> (12/pi)!
>
> Would it be possible to define a new data type via plugins (angles using
> radians internally, but displaying something else via formats, like dates
> that are represented internally like an offseted Julian Day) like one
> defines functions? 

You can't define such units, but you migth define trigonometric
functions using degrees as intput (or output).

Regards,
Jean