"""
Imshow demo
============

Demoing imshow
"""

import numpy as np
import matplotlib.pyplot as plt

def f(x, y):
    return (1 - x / 2 + x ** 5 + y ** 3) * np.exp(-x ** 2 - y ** 2)

n = 10
x = np.linspace(-3, 3, 8 * n)
y = np.linspace(-3, 3, 6 * n)
X, Y = np.meshgrid(x, y)
Z = f(X, Y)
plt.imshow(Z, interpolation='nearest', cmap='bone', origin='lower')
plt.xticks([])
plt.yticks([])


# Add a title and a box around it
from matplotlib.patches import FancyBboxPatch
ax = plt.gca()
ax.add_patch(FancyBboxPatch((-0.05, .87),
                            width=.66, height=.165, clip_on=False,
                            boxstyle="square,pad=0", zorder=3,
                            facecolor='white', alpha=1.0,
                            transform=plt.gca().transAxes))

plt.text(-0.05, 1.02, " Imshow:       plt.imshow(...)\n",
        horizontalalignment='left',
        verticalalignment='top',
        size='xx-large',
        transform=plt.gca().transAxes)

plt.text(-0.05, 1.01, "\n\n   Display an image to current axes ",
        horizontalalignment='left',
        verticalalignment='top',
        family='DejaVu Sans',
        size='large',
        transform=plt.gca().transAxes)

plt.show()