[MWForum]Erasing turtle lines

[Dan Stone]

Freezebg will do what you want, I believe.

> -----Original Message-----
> From: mwforum-admin@lists.mathcats.com 
> [mailto:mwforum-admin@lists.mathcats.com] On Behalf Of Karen Randall
> Sent: Thursday, June 24, 2004 3:07 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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