[MWForum]Erasing turtle lines

[krandall]

Ah!  Everything should be so simple.  We just were trying
plan "freeze".
Thanks for the clarification.

> Karen,
>
> Have you looked at the freezebg command?  Here's the blurb
> on it from the Help section of LCSI's MW Pro help
> materials.
> "Stands for freeze background. Freezes the background
> graphics in their current state. You can still draw over
> the background and erase the new drawings, but the
> original background (before freezing) won't be erased.
> When you click on the page icon in the Project Tab area, a
> message appears in the Status bar if the background is
> frozen. See unfreezebg."
> Christopher Myers
> OpenWorld Learning (OWL)
> www.openworldlearning.org
>
>
>
>
> > -----Original Message-----
> > From: mwforum-admin@lists.mathcats.com [mailto:mwforum-
> > admin@lists.mathcats.com] On Behalf Of Karen Randall
> > Sent: Thursday, June 24, 2004 1:07 PM
> > To: mwforum@lists.mathcats.com
> > Subject: [MWForum]Erasing turtle lines
> >
> > I have a student working on an animation where it would
> > be rather useful to freeze the background, then have a
> > turtle drawing on top of the frozen background.  That
> > would allow the turtle lines to be erased without
> > messing up the setting.   As far as we can tell, MW
> > doesn't allow for that kind of layering.
> > Using changing turtle shapes for the drawing/erasing
> > doesn't give enough flexibility in what the turtle
> > drawing is doing.
> >   Our solution so far is to have the background a solid
> > color, then erase the turtle's lines after they are
> > drawn by giving the same turtle commands with the pen
> > set to the background color.  Since it would be nice to
> > have a scene as the background instead of a plain color,
> > I'm wondering if there really is a way that background
> freezing can be made to help, or if you have any other
> > suggestions.
> > Thanks,
> > Karen
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