trying to understand the equivalent of clearing a widget/view/canvas and
recreating a different one in the same space.

let me explain:

I am creating a way to visualize different curves. when I change say the
desired curve I want to redraw the curve. If I went from Sin(x) to
Sin(x)+Cos(x) I want to wipe the canvas clean and then draw the new curve.

not clear how I could do that under gonga. not getting any ideas from the
examples/tutorials.

thanks, srini
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