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answered 2019-08-23 10:27:13 +0100
Wouldn't a slider for $x_r\in\left[0~1\right]$ and a label reporting "\alpha = 2\pi{}".format(x)do the job ? Of course, in the computation, you'd have to use $\alpha=x_r\cdot2\pi$. So what ?
"\alpha = 2\pi{}".format(x)