finkel@TAURUS.BITNET (05/15/88)
In article <10630003@hpesoc1.HP.COM> cunniff@hpesoc1.BITNET writes:
==>With all of the talk about a 2-d IFF drawing format, I thoughtfinkel@TAURUS.BITNET (05/17/88)
In article <737@taurus.BITNET> finkel@virgo.UUCP (Udi Finkelstein) writes: >In article <10630003@hpesoc1.HP.COM> cunniff@hpesoc1.BITNET writes:
mp1u+@andrew.cmu.edu.UUCP (05/18/88)
Richard Sexton expresses the following question: > >Having all four vertices allows the rectangle to be rotated by > >an arbitrary angle. > > Huh ? Imagine you have a rectangle defined by its top/left and bottom/right corner points: +------ | | ------+ You rotate an object by rotating its points: /\ / + / / + / \/ At this point it is pretty obvious to see that the two points that previously defined the rectangle no longer suffice to define its transformed version. You must have an additional piece of information, either in the form of the rotation angle (so you can transform the line segments) or all of its corners (so you can draw it like a polygon). --M Michael Portuesi / Carnegie Mellon University ARPA/UUCP: mp1u+@andrew.cmu.edu BITNET: rainwalker@drycas "Memories are uncertain friends, when recalled by messages" -- OMD, "Messages"