8000 Arbitrary spine placement · matplotlib/matplotlib@43ca13b · GitHub
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Arbitrary spine placement
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‎CHANGELOG

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2009-05-26 Add support for "axis spines" to have arbitrary location. -ADS
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2009-05-20 Add an empty matplotlibrc to the tests/ directory so that running
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tests will use the default set of rcparams rather than the user's
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config. - RMM

‎doc/api/api_changes.rst

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Changes beyond 0.98.x
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=====================
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* Axes instanaces no longer have a "frame" attribute. Instead, use the
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new "spines" attribute. Spines is a dictionary where the keys are
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the names of the spines (e.g. 'left','right' and so on) and the
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values are the artists that draw the spines. For normal
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(rectilinear) axes, these artists are Line2D instances. For other
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axes (such as polar axes), these artists may be Patch instances.
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* Polar plots no longer accept a resolution kwarg. Instead, each Path
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must specify its own number of interpolation steps. This is
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unlikely to be a user-visible change -- if interpolation of data is

‎doc/users/whats_new.rst

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What's new in matplotlib
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***************************
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.. _whats-new-svn:
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What new in svn
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===============
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Axis spine placement
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--------------------
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Andrew Straw has added the ability to place "axis spines" -- the lines
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that denote the data limits -- in various arbitrary locations. See
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:class:`matplotlib.spines.Spine`.
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.. _whats-new-0-98-4:
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What new in 0.98.4

‎examples/api/custom_projection_example.py

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from matplotlib.transforms import Affine2D, Affine2DBase, Bbox, \
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BboxTransformTo, IdentityTransform, Transform, TransformWrapper
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from matplotlib.projections import register_projection
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import matplotlib.spines as mspines
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import matplotlib.axis as maxis
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import numpy as np
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self.set_aspect(0.5, adjustable='box', anchor='C')
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self.cla()
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def _init_axis(self):
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self.xaxis = maxis.XAxis(self)
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self.yaxis = maxis.YAxis(self)
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# Do not register xaxis or yaxis with spines -- as done in
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# Axes._init_axis() -- until HammerAxes.xaxis.cla() works.
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# self.spines['hammer'].register_axis(self.yaxis)
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self._update_transScale()
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def cla(self):
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"""
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Override to set up some reasonable defaults.
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yaxis_text_base + \
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Affine2D().translate(8.0, 0.0)
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def get_xaxis_transform(self):
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def get_xaxis_transform(self,which=None):
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"""
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Override this method to provide a transformation for the
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x-axis grid and ticks.
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"""
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assert which in ['tick1','tick2','grid']
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return self._xaxis_transform
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def get_xaxis_text1_transform(self, pixelPad):
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"""
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return self._xaxis_text2_transform, 'top', 'center'
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def get_yaxis_transform(self):
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def get_yaxis_transform(self,which=None):
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"""
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Override this method to provide a transformation for the
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y-axis grid and ticks.
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"""
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assert which in ['tick1','tick2','grid']
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return self._yaxis_transform
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def get_yaxis_text1_transform(self, pixelPad):
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"""
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return Circle((0.5, 0.5), 0.5)
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def _gen_axes_spines(self):
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return {'hammer':mspines.Spine(self,'hammer',Circle((0.5, 0.5), 0.5))}
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# Prevent the user from applying scales to one or both of the
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# axes. In this particular case, scaling the axes wouldn't make
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# sense, so we don't allow it.

‎examples/pylab_examples/spine_placement_demo.py

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import matplotlib.pyplot as plt
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import numpy as np
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from matplotlib.pyplot import show
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fig = plt.figure()
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x = np.linspace(0,2*np.pi,100)
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y = 2*np.sin(x)
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ax = fig.add_subplot(1,2,1)
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ax.set_title('dropped spines')
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ax.plot(x,y)
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for loc, spine in ax.spines.iteritems():
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if loc in ['left','bottom']:
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spine.set_position(('outward',10)) # outward by 10 points
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elif loc in ['right','top']:
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spine.set_color('none') # don't draw spine
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else:
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raise ValueError('unknown spine location: %s'%loc)
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# turn off ticks where there is no spine
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ax.xaxis.set_ticks_position('bottom')
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ax.yaxis.set_ticks_position('left')
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ax = fig.add_subplot(1,2,2,sharex=ax)
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ax.plot(x,y)
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ax.set_title('normal spines')
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# ----------------------------------------------------
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fig = plt.figure()
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x = np.linspace(-np.pi,np.pi,100)
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y = 2*np.sin(x)
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ax = fig.add_subplot(2,2,1)
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ax.set_title('centered spines')
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ax.plot(x,y)
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ax.spines['left'].set_position('center')
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ax.spines['right'].set_color('none')
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ax.spines['bottom'].set_position('center')
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ax.spines['top'].set_color('none')
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ax.xaxis.set_ticks_position('bottom')
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ax.yaxis.set_ticks_position('left')
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ax = fig.add_subplot(2,2,2)
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ax.set_title('zeroed spines')
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ax.plot(x,y)
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ax.spines['left'].set_position('zero')
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ax.spines['right'].set_color('none')
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ax.spines['bottom'].set_position('zero')
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ax.spines['top'].set_color('none')
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ax.xaxis.set_ticks_position('bottom')
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ax.yaxis.set_ticks_position('left')
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ax = fig.add_subplot(2,2,3)
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ax.set_title('spines at axes (0.6, 0.1)')
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ax.plot(x,y)
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ax.spines['left'].set_position(('axes',0.6))
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ax.spines['right'].set_color('none')
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ax.spines['bottom'].set_position(('axes',0.1))
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ax.spines['top'].set_color('none')
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ax.xaxis.set_ticks_position('bottom')
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ax.yaxis.set_ticks_position('left')
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ax = fig.add_subplot(2,2,4)
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ax.set_title('spines at data (1,2)')
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ax.plot(x,y)
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ax.spines['left'].set_position(('data',1))
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ax.spines['right'].set_color('none')
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ax.spines['bottom'].set_position(('data',2))
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ax.spines['top'].set_color('none')
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ax.xaxis.set_ticks_position('bottom')
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ax.yaxis.set_ticks_position('left')
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# ----------------------------------------------------
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def adjust_spines(ax,spines):
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for loc, spine in ax.spines.iteritems():
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if loc in spines:
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spine.set_position(('outward',10)) # outward by 10 points
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else:
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spine.set_color('none') # don't draw spine
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# turn off ticks where there is no spine
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if 'left' in spines:
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ax.yaxis.set_ticks_position('left')
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else:
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# no yaxis ticks
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ax.yaxis.set_ticks([])
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if 'bottom' in spines:
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ax.xaxis.set_ticks_position('bottom')
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else:
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# no xaxis ticks
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ax.xaxis.set_ticks([])
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fig = plt.figure()
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x = np.linspace(0,2*np.pi,100)
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y = 2*np.sin(x)
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ax = fig.add_subplot(2,2,1)
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ax.plot(x,y)
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adjust_spines(ax,['left'])
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ax = fig.add_subplot(2,2,2)
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ax.plot(x,y)
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adjust_spines(ax,[])
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ax = fig.add_subplot(2,2,3)
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ax.plot(x,y)
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adjust_spines(ax,['left','bottom'])
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ax = fig.add_subplot(2,2,4)
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ax.plot(x,y)
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adjust_spines(ax,['bottom'])
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show()

‎examples/tests/backend_driver.py

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'simple_plot.py',
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'simplification_clipping_test.py',
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'specgram_demo.py',
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'spine_placement_demo.py',
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'spy_demos.py',
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'stem_plot.py',
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'step_demo.py',

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