Re: [Stellarium-pubdevel] AstroImage mod functions

[Matthew G. <mat...@gm...>]

On Wednesday 11 July 2007, Fabien Ch=C3=A9reau wrote:
> Hi Matthew,
>
> I think you should keep things simple in the AstroImage class. I.e. you
> shouldn't include in it the notion of angular size and rotation which is
> quite undefined for a polygon...
> I thik AstroImage should only contain methods like:
> //! Rotate the image with respect to it center
> //! @param angle the rotation angle in radian
> void rotate(double angle);
>
> //! Scale the image with respect to its center
> //! @param factor the scaling factor. The image is shrinked if <1
> void scale(double factor);
>
> Those methods would only modify the polygon points with respect to their
> previous position. Each method would compute a transformation matrix and
> apply it to the vectors of the polygon.

OK, I shall move them out of  you wish.

> Your plug-in itself will have to know what the absolute rotation and
> scaling are for one nebula, but these definitions are nebula specific.

Would you prefer that the Nebula class provides a method to get and set the=
=20
ConvexPolygon, and the manipulation of the Nebula position is done outside=
=20
the Nebula class, or for the Nebula class to have these functions?


Matthew