[MWForum]Erasing turtle lines

[Chris Myers]

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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