Bokeh Alpha Testing

bokeh_alpha_testing.py

import bokeh.plotting as plt
from itertools import product

plt.output_file('test.html')
alpha = 0.5
circle_size = 50
line_size = 5

cats = ['RGB', 'RGBA', 'Alpha+RGB', 'Alpha+RGBA']
p = plt.figure(x_range=cats, y_range=cats)

fill_color = (255., 0., 0.)
fill_color_alpha = (255., 0., 0., alpha)

line_color = (0., 255., 0.)
line_color_alpha = (0., 255., 0., alpha)


fill = [(1, {'fill_color': fill_color}),
        (2, {'fill_color': fill_color_alpha}),
        (3, {'fill_alpha': alpha, 'fill_color': fill_color}),
        (4, {'fill_alpha': alpha, 'fill_color': fill_color_alpha})]

line = [(1, {'line_color': line_color}),
        (2, {'line_color': line_color_alpha}),
        (3, {'line_alpha': alpha, 'line_color': line_color}),
        (4, {'line_alpha': alpha, 'line_color': line_color_alpha})]

combinations = product(fill, line)

for comb in combinations:
    this_fill, this_line = comb
    x, fill_options = this_fill
    y, line_options = this_line

    options = fill_options.copy()
    options.update(line_options)

    p.circle(x, y, line_width=line_size, size=circle_size, **options)

p.xaxis[0].axis_label = "Fill Options"
p.yaxis[0].axis_label = "Line Options"
p.title = "Fill and Line Option Combinations"

plt.show(p)