From: Joe Van Dyk <joevandyk@...>
Date: 2005-06-22T05:41:48+09:00
Subject: Re: tk canvas question

On 6/21/05, Joe Van Dyk <joevandyk@gmail.com> wrote:
> Hi,
> 
> I'm drawing stuff on a TkCanvas.  Essentially, a bunch of shapes that
> move around.  I need to keep track of where each shape has been, so I
> can draw the shape's history if needed (a "slug track").
> 
> So every time a shape move, I store its position.  When I want to view
> a shape's history, I draw a line connecting each stored position.
> 
> I'm currently drawing all of these lines directly on to the main canvas.
> 
> The problem is when I want to hide the history lines.  There can be
> 400 shapes, and each of them could have thousands of lines that detail
> their previous history.  Going through and deleting all the TkcLines
> is taking a very long time.
> 
> Is there a way to "group" each shape's history lines and then be able
> to give one command that shows and hides the lines in that group?
> 
> Thanks,
> Joe


Aha.  I found something called TkcGroup.  I'm having difficulties
figuring out how to remove and/or hide the canvas objects that are in
each group though.