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"""

This example shows how to use a path patch to draw a bunch of

rectangles for an animated histogram

"""

import numpy as np

import matplotlib.pyplot as plt

import matplotlib.patches as patches

import matplotlib.path as path

import matplotlib.animation as animation

fig, ax = plt.subplots()

# histogram our data with numpy

data = np.random.randn(1000)

n, bins = np.histogram(data, 100)

# get the corners of the rectangles for the histogram

left = np.array(bins[:-1])

right = np.array(bins[1:])

bottom = np.zeros(len(left))

top = bottom + n

nrects = len(left)

# here comes the tricky part -- we have to set up the vertex and path

# codes arrays using moveto, lineto and closepoly

# for each rect: 1 for the MOVETO, 3 for the LINETO, 1 for the

# CLOSEPOLY; the vert for the closepoly is ignored but we still need

# it to keep the codes aligned with the vertices

nverts = nrects*(1+3+1)

verts = np.zeros((nverts, 2))

codes = np.ones(nverts, int) * path.Path.LINETO

codes[0::5] = path.Path.MOVETO

codes[4::5] = path.Path.CLOSEPOLY

verts[0::5,0] = left

verts[0::5,1] = bottom

verts[1::5,0] = left

verts[1::5,1] = top

verts[2::5,0] = right

verts[2::5,1] = top

verts[3::5,0] = right

verts[3::5,1] = bottom

barpath = path.Path(verts, codes)

patch = patches.PathPatch(barpath, facecolor='green', edgecolor='yellow', alpha=0.5)

ax.add_patch(patch)

ax.set_xlim(left[0], right[-1])

ax.set_ylim(bottom.min(), top.max())

def animate(i):

# simulate new data coming in

data = np.random.randn(1000)

n, bins = np.histogram(data, 100)

top = bottom + n

verts[1::5,1] = top

verts[2::5,1] = top

ani = animation.FuncAnimation(fig, animate, 100, repeat=False)

plt.show()

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