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image_rgba.py — Bokeh 1.0.3 documentation
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image_rgba.py

from __future__ import division

import numpy as np

from bokeh.plotting import figure, show, output_file

N = 20
img = np.empty((N,N), dtype=np.uint32)
view = img.view(dtype=np.uint8).reshape((N, N, 4))
for i in range(N):
    for j in range(N):
        view[i, j, 0] = int(i/N*255)
        view[i, j, 1] = 158
        view[i, j, 2] = int(j/N*255)
        view[i, j, 3] = 255

p = figure(x_range=(0,10), y_range=(0,10))

# must give a vector of images
p.image_rgba(image=[img], x=0, y=0, dw=10, dh=10)

output_file("image_rgba.html", title="image_rgba.py example")

show(p)  # open a browser