Sector proportion

By default, sectors are of equal proportion. The proportions can be determined by the angles argument.

import plotly
import ptvis


elements = list(ptvis.Element) * 3
angles = (
    [50]*len(ptvis.Element)
    + [50]*len(ptvis.Element)
    + list(range(len(ptvis.Element)))
)

fig = plotly.graph_objects.Figure()
ptvis.attach_pie_cells(fig, elements, angles=angles)

plotly.io.show(fig)

Notice that data are not sorted and are arranged clockwise for each chemical element.