#!/usr/bin/env python

import numpy as npy
import matplotlib.cm as cm
from matplotlib.pyplot import figure, show, rc, savefig
 
# force square figure and square axes (looks better for polar, IMHO)
fig = figure(figsize=(8,8))
ax = fig.add_axes([0.1, 0.1, 0.8, 0.8], polar=True)
 
N = 20
theta = npy.arange(0.0, 2*npy.pi, 2*npy.pi/N)  # random angles
radii = 10*npy.random.rand(N)  # random bar heights
width = npy.pi/4*npy.random.rand(N) # random widths
 
# Create the bar plot
bars = ax.bar(theta, radii, width=width, bottom=0.0)
 
# Step through bars (a list of Rectangle objects) and
# change color based on its height and set its alpha transparency
# to 0.5
 
for r,bar in zip(radii, bars):
    bar.set_facecolor( cm.jet(r/10.))
    bar.set_alpha(0.5)
 
savefig('fig_polarBarColor.png')
show()