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Any interaction is only useful if the target users understand it. I'd suggest making a quick and dirty prototype that just has the radial slider and asking users to input various values and see how they get on. You should also test inputting the same values using two sliders, two text fields with number pads, and any other methods you can think of that ...


1

I clicked around with that radial slider in the link you provided and can tell you that I much prefer more standard methods of input (numerical input, horizontal sliders/range selectors, etc.). Why? Because a number range doesn't conceptually end where it begins as the radial slider shows. Furthermore, it tends to be a bit unclear how to update the range ...



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