# Imports
#
from libpysal import examples
import geopandas as gpd
import matplotlib.pyplot as plt
import matplotlib
import numpy as np
from splot.mapping import value_by_alpha_cmap
#
# Load Example Data
#
link_to_data = examples.get_path('columbus.shp')
gdf = gpd.read_file(link_to_data)
x = gdf['HOVAL'].values
y = gdf['CRIME'].values
#
# Create rgba values
#
rgba, _ = value_by_alpha_cmap(x, y)
#
# Create divergent rgba and change Colormap
#
div_rgba, _ = value_by_alpha_cmap(x, y, cmap='seismic', divergent=True)
#
# Create rgba values with reverted alpha values
#
rev_rgba, _  = value_by_alpha_cmap(x, y, cmap='RdBu', revert_alpha=True)