RE: MIA, Ask an Expert: fence or window but not wrap

["Alain Tougas" <alain@xxxxxxx>]

Hi,
This feature was present in the old days of Apple Logo (pre 1980). The
primitives wrap, fence and window were the three modes then. Unfortunately
for the rare user who needs them, these features were dropped a long time
ago.

In many cases, a ?fence? can be built around the screen by drawing a frame
and programming color detection. But this only works if the turtles are
moving under program control (fd bk glide), not by drag and drop.

In other cases, some primitives can be reprogrammed. For example, you may
create your own setpos and call it mysetpos, and use this one instead.
Mysetpos could do the appropriate calculation (or not move is the position
is out of bounds).

AT

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Sent: February 15, 2007 11:46 AM
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Subject: MIA, Ask an Expert: fence or window but not wrap

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from: Eric Brown <eric.brown@xxxxxxxx>
date: Thu Feb 15 08:35:51 2007

Is there a way to disable or otherwise nullify the
'wrap-round' effect when the turtle goes off the screen? I
have procedures for tessellations (multi-colored) and the
problem is getting them to end neatly at the edges of the
screen.

from: Eric brown <eric.brown@xxxxxxxx>
date: Thu Feb 15 08:38:07 2007

I have just posted a question about nullifying the 'wrap-round'effect
when the turtle goes off the screen. I should have said that I'm using
version 2.0.