>>> """
===============
Spine Placement
===============

Adjusting the location and appearance of axis spines.

Note: If you want to obtain arrow heads at the ends of the axes, also check
out the :doc:`/gallery/spines/centered_spines_with_arrows` example.
"""
... import numpy as np
... import matplotlib.pyplot as plt
... 
... 
... ###############################################################################
... 
... fig = plt.figure()
... x = np.linspace(-np.pi, np.pi, 100)
... y = 2 * np.sin(x)
... 
... ax = fig.add_subplot(2, 2, 1)
... ax.set_title('centered spines')
... ax.plot(x, y)
... ax.spines.left.set_position('center')
... ax.spines.right.set_color('none')
... ax.spines.bottom.set_position('center')
... ax.spines.top.set_color('none')
... ax.xaxis.set_ticks_position('bottom')
... ax.yaxis.set_ticks_position('left')
... 
... ax = fig.add_subplot(2, 2, 2)
... ax.set_title('zeroed spines')
... ax.plot(x, y)
... ax.spines.left.set_position('zero')
... ax.spines.right.set_color('none')
... ax.spines.bottom.set_position('zero')
... ax.spines.top.set_color('none')
... ax.xaxis.set_ticks_position('bottom')
... ax.yaxis.set_ticks_position('left')
... 
... ax = fig.add_subplot(2, 2, 3)
... ax.set_title('spines at axes (0.6, 0.1)')
... ax.plot(x, y)
... ax.spines.left.set_position(('axes', 0.6))
... ax.spines.right.set_color('none')
... ax.spines.bottom.set_position(('axes', 0.1))
... ax.spines.top.set_color('none')
... ax.xaxis.set_ticks_position('bottom')
... ax.yaxis.set_ticks_position('left')
... 
... ax = fig.add_subplot(2, 2, 4)
... ax.set_title('spines at data (1, 2)')
... ax.plot(x, y)
... ax.spines.left.set_position(('data', 1))
... ax.spines.right.set_color('none')
... ax.spines.bottom.set_position(('data', 2))
... ax.spines.top.set_color('none')
... ax.xaxis.set_ticks_position('bottom')
... ax.yaxis.set_ticks_position('left')
... 
... ###############################################################################
... # Define a method that adjusts the location of the axis spines
... 
... 
... def adjust_spines(ax, spines):
...     for loc, spine in ax.spines.items():
...         if loc in spines:
...             spine.set_position(('outward', 10))  # outward by 10 points
...         else:
...             spine.set_color('none')  # don't draw spine
... 
...     # turn off ticks where there is no spine
...     if 'left' in spines:
...         ax.yaxis.set_ticks_position('left')
...     else:
...         # no yaxis ticks
...         ax.yaxis.set_ticks([])
... 
...     if 'bottom' in spines:
...         ax.xaxis.set_ticks_position('bottom')
...     else:
...         # no xaxis ticks
...         ax.xaxis.set_ticks([])
... 
... 
... ###############################################################################
... # Create another figure using our new ``adjust_spines`` method
... 
... fig = plt.figure()
... 
... x = np.linspace(0, 2 * np.pi, 100)
... y = 2 * np.sin(x)
... 
... ax = fig.add_subplot(2, 2, 1)
... ax.plot(x, y, clip_on=False)
... adjust_spines(ax, ['left'])
... 
... ax = fig.add_subplot(2, 2, 2)
... ax.plot(x, y, clip_on=False)
... adjust_spines(ax, [])
... 
... ax = fig.add_subplot(2, 2, 3)
... ax.plot(x, y, clip_on=False)
... adjust_spines(ax, ['left', 'bottom'])
... 
... ax = fig.add_subplot(2, 2, 4)
... ax.plot(x, y, clip_on=False)
... adjust_spines(ax, ['bottom'])
... 
... plt.show()
...