Address matplotlib user warning on wind rose plot

[pablo-benito]

Supress matplotlib UserWarning on wind rose plot

The WindRose functions plot_wind_rose and plot_wind_rose_ti triggers a matplotlib UserWarning.

Example code:

from floris.tools.wind_rose import WindRose
import matplotlib.pylab as plt

wr = WindRose()
wr.make_wind_rose_from_user_data([1,2,3], [4,5,6])
wr.plot_wind_rose()

plt.show()

Output:

Correcting negative Overhang:-2.5
Correcting negative Overhang:-7.5
wind_rose.py:1481: UserWarning: FixedFormatter should only be used together with FixedLocator

This pull request removes this warning by explicitly setting the ticks associated with the windrose labels.

Related issue

None

Impacted areas of the software

wind_rose.py

Additional supporting information

Matplotlib issue, with a similar question about this UserWarning: matplotlib/matplotlib#18848

Test results, if applicable

[Bartdoekemeijer]

Nice find, the PR looks good to me! And good to see you around here @pablo-benito!!

[rafmudaf]

Well done @pablo-benito, thanks for the contribution!