Hi Stephen (and everybody else reading this)

I am sorry, but I do not understand your answer. Well,
I think I understand it, but I do not see how it can solve
my problem.

I don't see the difference between
(a) working with semi-axis ('radii') of r and R
and
(b) semi-axis of R and L*R

Isn't a scaled circle (cylinder) an ellipse ?
circle at origin:
  x=R*cos(theta)
  y=R*sin(theta)

scale <1,L,*> =>
  x=1*R*cos(theta)=R*cos(theta)
  y=L*R*cos(theta)

translate <x0,y0,*>
  x=x0+R*cos(theta)
  y=y0+L*R*cos(theta)

- this is an ellipse


Is this wrong?

(See also my next post which explain my
problem further)


Thanks


Philippe

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