Calculates Convexity index of each object in given GeoDataFrame.
Adapted from [DPR+17].
GeoDataFrame containing objects
the name of the dataframe column, np.array, or pd.Series where is stored area value. If set to None, function will calculate areas
during the process without saving them separately.
>>> buildings_df['convexity'] = momepy.Convexity(buildings_df).series
Series containing resulting values
Series containing used area values
Initialize self. See help(type(self)) for accurate signature.