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DOC: Cleanup Spine placement example #24377

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Nov 6, 2022
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DOC: Cleanup Spine placement example #24377

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60 changes: 26 additions & 34 deletions examples/spines/spine_placement_demo.py
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Original file line number Diff line number Diff line change
@@ -1,9 +1,9 @@
"""
===============
Spine Placement
Spine placement
===============

Adjusting the location and appearance of axis spines.
The position of the axis spines can be influenced using `~.Spine.set_position`.

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.
Expand All @@ -14,49 +14,41 @@

###############################################################################

fig = plt.figure()
x = np.linspace(-np.pi, np.pi, 100)
x = np.linspace(0, 2*np.pi, 100)
y = 2 * np.sin(x)

ax = fig.add_subplot(2, 2, 1)
ax.set_title('centered spines')
fig, ax_dict = plt.subplot_mosaic(
[['center', 'zero'],
['axes', 'data']]
)
fig.suptitle('Spine positions')


ax = ax_dict['center']
ax.set_title("'center'")
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.spines[['left', 'bottom']].set_position('center')
ax.spines[['top', 'right']].set_visible(False)

ax = fig.add_subplot(2, 2, 2)
ax.set_title('zeroed spines')
ax = ax_dict['zero']
ax.set_title("'zero'")
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.spines[['left', 'bottom']].set_position('zero')
ax.spines[['top', 'right']].set_visible(False)

ax = fig.add_subplot(2, 2, 3)
ax.set_title('spines at axes (0.6, 0.1)')
ax = ax_dict['axes']
ax.set_title("'axes' (0.2, 0.2)")
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.spines.left.set_position(('axes', 0.2))
ax.spines.bottom.set_position(('axes', 0.2))
ax.spines[['top', 'right']].set_visible(False)

ax = fig.add_subplot(2, 2, 4)
ax.set_title('spines at data (1, 2)')
ax = ax_dict['data']
ax.set_title("'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')
ax.spines[['top', 'right']].set_visible(False)

###############################################################################
# Define a method that adjusts the location of the axis spines
Expand Down
8 changes: 6 additions & 2 deletions lib/matplotlib/spines.py
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Original file line number Diff line number Diff line change
Expand Up @@ -302,8 +302,12 @@ def set_position(self, position):

Additionally, shorthand notations define a special positions:

* 'center' -> ('axes', 0.5)
* 'zero' -> ('data', 0.0)
* 'center' -> ``('axes', 0.5)``
* 'zero' -> ``('data', 0.0)``

Examples
--------
:doc:`/gallery/spines/spine_placement_demo`
"""
if position in ('center', 'zero'): # special positions
pass
Expand Down