From: Ignatz Hafflegab <mcpeople@...>
Date: 2011-03-01T12:06:19+09:00
Subject: Re: tk canvas drag items

Thank you very much for your reply.  I hope that you didn't feel
obligated because I dropped your name.  It was mentioned because I was
grateful for the samples included in the 1.8.6 Ruby installer.

The plot.rb sample prompted my ambiguous questions. I wanted to
constrain the points to the actual size of the canvas.  When
plot.rb's window is not maximized, a point can be dragged completely off
the canvas.  If it is dragged off the east edge of the canvas, it will
reappear when the window is maximized.  I assume that's because the
canvas is set to FILL X.  However, if a point is dragged far enough off
of the west, north, or south edge when the canvas is not maximized,  it
is consigned to oblivion, and it will not be see again.

What I'm looking for is an example that will confine a selected item
within the boundaries fixed-size canvas while the item is dragged.

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