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Commit 0edb99f

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ImportanceOfBeingErnestMeeseeksDev[bot]
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Backport PR #12394: DOC: fix CL tutorial to give same output from saved file and example
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‎tutorials/intermediate/constrainedlayout_guide.py

Copy file name to clipboardExpand all lines: tutorials/intermediate/constrainedlayout_guide.py
+38-22Lines changed: 38 additions & 22 deletions
Original file line numberDiff line numberDiff line change
@@ -205,11 +205,10 @@ def example_plot(ax, fontsize=12, nodec=False):
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#############################################
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# However, this will steal space from a subplot layout:
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fig, axs = plt.subplots(2, 2, constrained_layout=True)
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for ax in axs.flatten()[:-1]:
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ax.plot(np.arange(10))
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axs[1, 1].plot(np.arange(10), label='This is a plot')
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axs[1, 1].legend(loc='center left', bbox_to_anchor=(0.8, 0.5))
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fig, axs = plt.subplots(1, 2, figsize=(4, 2), constrained_layout=True)
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axs[0].plot(np.arange(10))
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axs[1].plot(np.arange(10), label='This is a plot')
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axs[1].legend(loc='center left', bbox_to_anchor=(0.8, 0.5))
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#############################################
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# In order for a legend or other artist to *not* steal space
@@ -218,30 +217,47 @@ def example_plot(ax, fontsize=12, nodec=False):
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# cropped, but can be useful if the plot is subsequently called
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# with ``fig.savefig('outname.png', bbox_inches='tight')``. Note,
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# however, that the legend's ``get_in_layout`` status will have to be
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# toggled again to make the saved file work:
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# toggled again to make the saved file work, and we must manually
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# trigger a draw if we want constrained_layout to adjust the size
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# of the axes before printing.
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fig, axs = plt.subplots(2, 2, constrained_layout=True)
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for ax in axs.flatten()[:-1]:
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ax.plot(np.arange(10))
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axs[1, 1].plot(np.arange(10), label='This is a plot')
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leg = axs[1, 1].legend(loc='center left', bbox_to_anchor=(0.8, 0.5))
224+
fig, axs = plt.subplots(1, 2, figsize=(4, 2), constrained_layout=True)
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axs[0].plot(np.arange(10))
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axs[1].plot(np.arange(10), label='This is a plot')
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leg = axs[1].legend(loc='center left', bbox_to_anchor=(0.8, 0.5))
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leg.set_in_layout(False)
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wanttoprint = False
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if wanttoprint:
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leg.set_in_layout(True)
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fig.do_constrained_layout(False)
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fig.savefig('outname.png', bbox_inches='tight')
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# trigger a draw so that constrained_layout is executed once
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# before we turn it off when printing....
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fig.canvas.draw()
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# we want the legend included in the bbox_inches='tight' calcs.
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leg.set_in_layout(True)
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# we don't want the layout to change at this point.
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fig.set_constrained_layout(False)
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fig.savefig('CL01.png', bbox_inches='tight', dpi=100)
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#############################################
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# The saved file looks like:
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#
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# .. image:: /_static/constrained_layout/CL01.png
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# :align: center
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#
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# A better way to get around this awkwardness is to simply
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# use a legend for the figure:
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fig, axs = plt.subplots(2, 2, constrained_layout=True)
239-
for ax in axs.flatten()[:-1]:
240-
ax.plot(np.arange(10))
241-
lines = axs[1, 1].plot(np.arange(10), label='This is a plot')
246+
# use the legend method provided by `.Figure.legend`:
247+
fig, axs = plt.subplots(1, 2, figsize=(4, 2), constrained_layout=True)
248+
axs[0].plot(np.arange(10))
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lines = axs[1].plot(np.arange(10), label='This is a plot')
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labels = [l.get_label() for l in lines]
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leg = fig.legend(lines, labels, loc='center left',
244-
bbox_to_anchor=(0.8, 0.5), bbox_transform=axs[1, 1].transAxes)
252+
bbox_to_anchor=(0.8, 0.5), bbox_transform=axs[1].transAxes)
253+
fig.savefig('CL02.png', bbox_inches='tight', dpi=100)
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255+
#############################################
256+
# The saved file looks like:
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#
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# .. image:: /_static/constrained_layout/CL02.png
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# :align: center
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#
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###############################################################################
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# Padding and Spacing

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