# -----------------------------------------------------------------------------
# Copyright (c) 2015, Nicolas P. Rougier. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
import numpy as np
import matplotlib.pyplot as plt

# New figure with white background
fig = plt.figure(figsize=(6,6), facecolor='white')

# New axis over the whole figureand a 1:1 aspect ratio
ax = fig.add_axes([0.005,0.005,.99,.99], frameon=True, aspect=1)

# Number of ring
n = 50
size_min = 50
size_max = 50*50
          
# Ring position 
P = np.random.uniform(0,1,(n,2))

# Ring colors
C = np.ones((n,4)) * (0,0,0,1)

# Alpha color channel goes from 0 (transparent) to 1 (opaque)
C[:,3] = np.linspace(0,1,n)

# Ring sizes
S = np.linspace(size_min, size_max, n)

# Scatter plot
scat = ax.scatter(P[:,0], P[:,1], s=S, lw = 0.5,
                  edgecolors = C, facecolors='None')

# Ensure limits are [0,1] and remove ticks
ax.set_xlim(0,1), ax.set_xticks([])
ax.set_ylim(0,1), ax.set_yticks([])

# plt.savefig("../figures/rain-static.png",dpi=72)
plt.show()