Re: [pygame] how to "think rotation" on a longitude-latitude reference system ?

[Michael George <mdgeorge@xxxxxxxxxxxxxx>]

Massimo Di Stefano wrote:
> to learn more maybe i need numerical examples, so now i'm creating 2 
> first function to :
>
> transform lon-lat-heading to quaternion representation and viceversa 
> from quaternion to euler angles.
>
> something like :
>
> euler2quat(lon,lat,heading)
> quat2euler(q)  # where q = array((x,y,z,w),float)
>
>
> btw, i'll continue to reading and study
> tring to find a solution to a numerical example, like
>
> start:
> point_0 = 0,0,0 
> - go ahead for  ( 0 degres_X ;  45 degres_Y )  (north direction) 
> stop1 : position = point1
>
> point_1 = 0,45,0
> - rotate = 22.5° (NorthNorth East) and go ahead for ( 5 degres_X' ; 5 
> degres_Y' ) where X' and Y' are new axis " |_ "
> point_2 = x,y,heading  <- unknow

Massimo,

The Quaternion class in pyeuclid contains methods to convert to and from 
euler angles and matrices (see rotate_euler, get_euler, new_rotate_euler 
and similarly for _matrix and _axis_angle).  For some reason these 
aren't in the docs, but you should be able to use them and/or study them.

--Mike