10000 Update diagram in subplots_adjust documentation to clarify parameters by Bindi003 · Pull Request #30029 · matplotlib/matplotlib · GitHub
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Update diagram in subplots_adjust documentation to clarify parameters #30029

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Merged
merged 3 commits into from
May 9, 2025
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Update diagram in subplots_adjust documentation to clarify parameters #30029

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Update diagram in subplots_adjust documentation to clarify parameter …
May 9, 2025
dd7f51b
Corrected subplots_adjust diagram
May 9, 2025
785140b
Addressed diagram feedback and simplified annotation calls
May 9, 2025
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25 changes: 14 additions & 11 deletions doc/_embedded_plots/figure_subplots_adjust.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,27 +2,30 @@


def arrow(p1, p2, **props):
axs[0, 0].annotate(
"", p1, p2, xycoords='figure fraction',
overlay.annotate(
"", p1, p2, xycoords='figure fraction',
arrowprops=dict(arrowstyle="<->", shrinkA=0, shrinkB=0, **props))


fig, axs = plt.subplots(2, 2, figsize=(6.5, 4))
fig.set_facecolor('lightblue')
fig.subplots_adjust(0.1, 0.1, 0.9, 0.9, 0.4, 0.4)

overlay = fig.add_axes([0, 0, 1, 1], zorder=100)
overlay.axis("off")

for ax in axs.flat:
ax.set(xticks=[], yticks=[])

arrow((0, 0.75), (0.1, 0.75)) # left
arrow((0.435, 0.75), (0.565, 0.75)) # wspace
arrow((0.9, 0.75), (1, 0.75)) # right
arrow((0.435, 0.25), (0.565, 0.25)) # wspace
arrow((0, 0.8), (0.9, 0.8)) # right
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@story645 story645 May 9, 2025 •
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looking at the function and function calls, I think the arrow function adds in an unncessary layer of indirection given that the only argument actually passed in is the point. I think here it would be a lot clearer to just do:

arrowprops=dict(arrowstyle="<->", shrinkA=0, shrinkB=0)
xycoords = 'figure fraction'

overlay.annotate("", (0, 0.75), (0.1, 0.75)), xycoords=xycoords, arrowprops=arrowprops)
overlay.annotate("",(0.435, 0.25), (0.565, 0.25)  , xycoords=xycoords, arrowprops=arrowprops)
overlay.annotate("", (0, 0.8), (0.9, 0.8), xycoords=xycoords, arrowprops=arrowprops)

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Hi @story645 , thanks for the suggestion! I've updated the code to use the direct overlay.annotate() calls as you recommended :)

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@story645 I disagree. I intentionally introduced the arrow function as a semantic wrapper. I still find annotate("", xy1, xy2) a really awkward API. This is basically the discussion of #29826 (which is only deferred because we need to agree what the underlying artist should be), and the need for a reasonable high-level API still persists.

I'm not quite happy with reverting the wrapper, but since this is only an internal helper script and does not show up prominently in the docs, it's not worth fighting over.

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@story645 story645 May 9, 2025 •
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Sorry, but I also think doc examples are not the place to introduce new API. In this example, the extra arrow function to me felt very distracting once I figured out it wasn't doing anything extra. I would say here if anything then ConnectionPatch should just be used explicitly or the arrow function here should be wrapping ConnectionPatch.

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This is not intoducing new API and the code is not user-facing or teaching by intent. In my perspective, it's just a helper function making the example more readable for editors of that code. Obviously, YMMV. Let's not get into the discussion right now.

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Sorry, is kinda how I read `intentionally introduced the arrow function as a semantic wrapper. I still find annotate("", xy1, xy2) a really awkward API."

fig.text(0.05, 0.7, "left", ha="center")
fig.text(0.5, 0.7, "wspace", ha="center")
fig.text(0.95, 0.7, "right", ha="center")
fig.text(0.5, 0.3, "wspace", ha="center")
fig.text(0.05, 0.83, "right", ha="center")

arrow((0.25, 0), (0.25, 0.1)) # bottom
arrow((0.75, 0), (0.75, 0.1)) # bottom
arrow((0.25, 0.435), (0.25, 0.565)) # hspace
arrow((0.25, 0.9), (0.25, 1)) # top
fig.text(0.28, 0.05, "bottom", va="center")
arrow((0.80, 0), (0.8, 0.9)) # top
fig.text(0.65, 0.05, "bottom", va="center")
fig.text(0.28, 0.5, "hspace", va="center")
fig.text(0.28, 0.95, "top", va="center")
fig.text(0.82, 0.05, "top", va="center")
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