Alan W. Irwin schrieb:
> [...] I would suggest you
> handle aspect ratio (question 2) above by sticking to one of the
> pre-existing PLplot coordinate systems to specify the semimajor and
> semiminor axes of the ellipse.  Probably you would want to use world
> coordinates (and similarly you would want to use world coordinates to
> specify the centre of the ellipse), but the choice of coordinate system
> really depends on how convenient those coordinates would be for your
> proposed use case(s), see my question above.

Let me mention that example x32c.c shows a use case for not using world
coordinates: drawing an undistorted circle as a marker.

Robert

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