I don't think the rectangle will work for me because I need some
diaganol lines.
The canvas will most likely be fine, but there will be some overhead
in tracking which lines need to be redrawn each time the lines
displayed changes. Basically in this project the lines interconnect
nodes/buttons and the lines can disappear and reappear when nodes are
clicked. Interconnecting nodes with lines and using a
line.visible=TRUE or line.visible=FALSE in the node mouseup event is
fast and simple and should do exactly what I need, but lines don't
display properly at the moment of course. Well, off to the drawing
board.. err.. canvas I mean.
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