Issue with HiDPI on Linux

[m-pilia]

It seems there is an issue with HiDPI scaling on Linux.

How to reproduce

I got the following on Arch Linux, KDE, monitor resolution 3200x1800, scale factor set to 2.0 through KScreen settings.

import numpy as np
import pptk
x = np.random.rand(100, 3)
v = pptk.viewer(x)