[MWForum]large coordinates for "setpos" command

[Jeff Knope]

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<DIV style="FONT: 10pt arial">--------- Original Message --------<BR>From:
mwforum@lists.mathcats.com<BR>To: "MWForum@lists.mathcats.com"
&lt;MWForum@lists.mathcats.com&gt;<BR>Subject: [MWForum]large coordinates
for "setpos" command<BR>Date: 09/13/04 11:32<BR><BR><FONT face="Courier New"
size=2>hello all!<BR>I want to know the behavier of the turtle against
various screen size in <BR>getting the command like "setpos [-300 -200],
sometime its goes to the <BR>lowest point of the screen,and sometimes its
goes up, how can I know what is <BR>the limit of coordinates of each
size,and what's the turtle does is a turn, <BR>can we calculate where setpos
will be (when its larger than screen)' I <BR>search information in Help and
didn't find....<BR>thanks
Zehava<BR><BR>_________________________________________________________________<BR>MSN
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<BR>mailto:mwforum-admin@lists.mathcats.com<BR><BR>Hi Zehava,<BR><BR>I have
only a partial answer to your question. The behavior of a turtle "bouncing"
off one margin and showing up someplace else on the screen is a function of
Projectsize creating a display boundary. <BR><BR>It is probably possible to
calculate the amount by which a setpos is outside the boundaries created by
Projectsize. I believe the turtle shows up the same distance inside the
opposite boundary as it is outside the exceeded boundary. <BR><BR>Sometimes
this can be used to interesting effect, as in the Lineweaver program I've
previously posted.<BR>&nbsp;<BR>More often, in my uses, it is an undesirable
effect. I've found issuing a <STRONG>setprojectsize</STRONG> [2000 2000]
when&nbsp;I first launch MW will get rid of most all of that "bouncing"
effect. The only problem is the turtle will&nbsp;then be out of sight, off
the screen. In my uses this is not a problem. But in most applications it
will leave the user bewildered.<BR><BR>Older versions of Logo had the
commands <STRONG>fence</STRONG> and <STRONG>nofence,</STRONG> which gave the
option of having the "bounce" effect or not. Let me take this chance to urge
LCSI to restore these very useful commands.<BR><BR>Good luck,
Jeff</FONT></DIV></BLOCKQUOTE><BR />
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