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"""Demonstrate/test the Sankey class by producing a long chain of connections.
"""
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.sankey import Sankey
from itertools import cycle
links_per_side = 6
def side(sankey, n=1):
"""Generate a side chain.
"""
prior = len(sankey.diagrams)
colors = cycle(['orange', 'b', 'g', 'r', 'c', 'm', 'y'])
for i in range(0, 2*n, 2):
sankey.add(flows=[1, -1], orientations=[-1, -1],
patchlabel=str(prior+i), facecolor=colors.next(),
prior=prior+i-1, connect=(1, 0), alpha=0.5)
sankey.add(flows=[1, -1], orientations=[1, 1],
patchlabel=str(prior+i+1), facecolor=colors.next(),
prior=prior+i, connect=(1, 0), alpha=0.5)
def corner(sankey):
"""Generate a corner link.
"""
prior = len(sankey.diagrams)
sankey.add(flows=[1, -1], orientations=[0, 1],
patchlabel=str(prior), facecolor='k',
prior=prior-1, connect=(1, 0), alpha=0.5)
fig = plt.figure()
ax = fig.add_subplot(1, 1, 1, xticks=[], yticks=[],
title="Why would you want to do this?\n(But you could.)")
sankey = Sankey(ax=ax, unit=None)
sankey.add(flows=[1, -1], orientations=[0, 1],
patchlabel="0", facecolor='k',
rotation=45)
side(sankey, n=links_per_side)
corner(sankey)
side(sankey, n=links_per_side)
corner(sankey)
side(sankey, n=links_per_side)
corner(sankey)
side(sankey, n=links_per_side)
sankey.finish()
# Notice:
# 1. The alignment doesn't drift significantly (if at all; with 16007
# subdiagrams there is still closure).
# 2. The first diagram is rotated 45 deg, so all other diagrams are rotated
# accordingly.
plt.show()
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