Specifying a point of origin

[Dar Scott]

On Tuesday, October 22, 2002, at 11:16 AM, Roger.E.Eller at sealedair.com 
wrote:

>> Probably the simplest approch would be to
>> subtract the y coordinate from the
>> height of the stack for each point -- could be done in a loop fairly
>> quickly.
>
> Thanks Richard!  That did the trick. I should have figured that one out,
> but you know how it is after the 12th hour of writing code.

I don't understand why this works.  Are all shapes symmetrical up and down?

Dar