It does appear from your illustration, you can calculate the major and
minor access vectors.
You could also consider doing an axonometric drawing tool, that way you
only ever need know 3 different ellipses (top,left,right).
Or, you could calculate it using trig and the designer's trick where you
draw the box, bisect it horizontally, vertically and diagonally (both
ways), then compute a polygon based upon the tangents to the horizontal
and vertical bisectors, and 2/3 the diagonal bisectors. A bit of
interpolation and you could probably estimate a decent ellipse.
-Chipp
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