Twisted MS to PS

I have a LISP which transforms a MS-point to a PS-point and uses this to insert a block in PS. This only works when the viewport is 'normal'. Now I want to make it work when the viewport is rotated (DVIEW - TWIST - 90). Now I get the same points as when the viewport wasn't twisted.
For the old LISP I used (trans mspoint 2 3) to get from MS to PS. Any-one have any ideas on how to twist PS to get the points right???

Jeroen

 

Hi Jeroen,

I haven't dealt with this specific situation myself, but... you might get
lucky and this work. If all your resulting point is lacking is the final
rotation about the origin, then this pair of formulas should be all you
need:
x = x cos(r) - y sin(r)
y = x sin (r) + y cos(r)

This assumes everything involved is 2D (or at least viewdir = 0,0,1). I'm a
little surprised that trans doesn't take care of that, but not too much. If
that isn't all it needs, you might have to calculate the whole
transformation yourself with raw information, but again, I haven't looked at
this particular situation in depth myself. If you need more help, posting
your code would be helpful to someone trying to help you.

--
James Allen, EIT
Malicoat-Winslow Engineers, P.C.
Columbia, MO

insert a block in PS. This only works when the viewport is 'normal'. Now I
want to make it work when the viewport is rotated (DVIEW - TWIST - 90). Now
I get the same points as when the viewport wasn't twisted.

have any ideas on how to twist PS to get the points right???