May be I'm being a bit goofy, but I just made a stack called "POO" and put the
following commands/messages into the message box:
1. put the vis of stack "POO"
which yielded 'true'
2. set the vis of stack "POO" to false
3. put the vis of stack "POO"
which yielded 'false'
4. set the vis of stack "POO" to true
which yielded 'true'
not strictly rocket science !
I then tried this:
5. move stack "POO" to -1000,-1000
and it sedately moved off-screen
4. put the vis of stack "POO"
which yielded 'true' [obviously]
although I could not see the stack.
So I concluded, with my philosophical hat jammed well down over my eyes,
that VIS has nothing to do with whether I can see the stack or not, but has
something to do with one of the properties of an object.
Of course this confusion is one of the side-effects of using a programming
language which resembles natural language in some respects. Had the language
been written so that VIS referred to both the object's opacity being either
100% or 0% and/or whether it was within a bounding rectangle (whether computer
screen or containing object) that confusion would not have arisen, as that is
closer to the way 'visible' is defined in the English language.
sincerely, Richmond Mathewson.
____________________________________________________________
A Thorn in the flesh is better than a failed Systems Development Life Cycle.
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