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patquem · 2022-03-25T10:35:44Z

PR Summary

Closes #22570
Make axis('equal') available
(I am new in PR - sorry for not doing things correctly)

PR Checklist

Tests and Styling

Has pytest style unit tests (and pytest passes).
Is Flake 8 compliant (install flake8-docstrings and run flake8 --docstring-convention=all).

Documentation

New features are documented, with examples if plot related.
New features have an entry in doc/users/next_whats_new/ (follow instructions in README.rst there).
[N/A] API changes documented in doc/api/next_api_changes/ (follow instructions in README.rst there).
Documentation is sphinx and numpydoc compliant (the docs should build without error).

Example

import numpy as np
import matplotlib.pyplot as plt


def plot_hexahedron(ax, x, y, z, *args, **kwargs):
    def plot_edge(i, j):
        ax.plot([x[i], x[j]], [y[i], y[j]], [z[i], z[j]], *args, **kwargs)

    # edges associated to the y=0 face
    plot_edge(0, 1)
    plot_edge(1, 3)
    plot_edge(3, 2)
    plot_edge(2, 0)

    # edges associated to the y=1 face
    plot_edge(4, 5)
    plot_edge(5, 7)
    plot_edge(7, 6)
    plot_edge(6, 4)

    # missing edges (x=cste)
    plot_edge(0, 4)
    plot_edge(1, 5)
    plot_edge(3, 7)
    plot_edge(2, 6)


def ex_hexahedron():
    """ Example of hexahedron representation with Matplotlib """
    points = np.array([[0, 0, 0], [1, 0, 0], [0, 1, 0], [1, 1, 0],
                       [0, 0, 3], [1, 0, 3], [0, 1, 3], [1, 1, 3]])

    x = np.asarray([coord[0] for coord in points])
    y = np.asarray([coord[1] for coord in points])
    z = np.asarray([coord[2] for coord in points])

    fig, axes = plt.subplots(1, 2, figsize=(12, 5),
                             subplot_kw={'projection': '3d'})

    def plot(ax):
        plot_hexahedron(ax, x, y, z, 'r')
        ax.set_xlabel("X")
        ax.set_ylabel("Y")
        ax.set_zlabel("Z")

    # standard representation (aspect='auto')
    plot(axes[0])
    axes[0].set_title("Standard representation")

    # 3d axis equal (aspect='equal')
    plot(axes[1])
    axes[1].set_aspect('equal')
    axes[1].set_title("set_aspect('equal)")
    plt.tight_layout()


ex_hexahedron()
plt.show()

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oscargus · 2022-03-25T15:01:24Z

patquem · 2022-03-29T09:29:58Z

Hi @oscargus,
I have changed the test.
I agree with you concerning the visualization (confusing in the Y-direction) but I have no idea of how to fix that.
Patrick

oscargus · 2022-04-01T13:59:59Z

It seems like it is the location of the ytick-labels that is off. The -1.0 label is outside of the viewable area and all other are shifted one position. So I guess that the actual box is drawn correctly, but the labels are misplaced.

Edit: To clarify, I guess that this problem is not caused by your change, so it seems to be an issue elsewhere.

patquem · 2022-04-01T14:14:43Z

I agree with you.

Concerning the test, I will try to finalize it next week.
Presently, the figure I gave for comparison was generated with my current working env.
This engenders some differences with figure generated by the main branch.
I have to generate a new figure from my forked (and updated) matplotlib branch, to be coherent with it, I guess.

oscargus · 2022-04-05T10:34:59Z

            value       description
            =========   ==================================================
            'auto'      automatic; fill the position rectangle with data.
+            'equal'     automatic; adapt the axes to have equal aspect


Suggested change

'equal' automatic; adapt the axes to have equal aspect

'equal' automatic; adapt the axes to have equal aspect.

oscargus · 2022-04-05T10:35:35Z

        mpl_toolkits.mplot3d.axes3d.Axes3D.set_box_aspect
        """
-        if aspect != 'auto':
+        if aspect not in ['auto', 'equal']:


Suggested change

if aspect not in ['auto', 'equal']:

if aspect not in ('auto', 'equal'):

Minor thing, but slightly faster this way as this can be "compiled".

oscargus · 2022-04-05T10:40:27Z

Approved subject to minor fixes and rebasing/squashing into single commit.

oscargus · 2022-04-05T10:41:09Z

The error comes from adding a figure in one commit and updating in another. If you rebase and squash the commits into a single one, it should go away.

oscargus · 2022-04-05T10:44:55Z

Oh, you are using the main branch. In general it is better to not do that, but to create a separate branch.

Now, you need to do something like
git rebase -i HEAD~4
(HEAD minus four commits)
change pick to fixup for the last three.
git push --force-with-lease

Then, for later updates you can do

git commit --amend

so that the change will stay in that single commit.

oscargus · 2022-04-05T14:43:52Z

We can also squash the commits when merging.

patquem · 2022-04-05T16:49:20Z

Hi @oscargus ,
It sounds like chinese for me.
I have tried to do what you wrote. Not sure I did the things correctly. (?)

oscargus · 2022-04-07T07:02:50Z

github-actions Bot reviewed Mar 25, 2022

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oscargus added the topic: mplot3d label Mar 25, 2022

oscargus reviewed Apr 5, 2022

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oscargus approved these changes Apr 5, 2022

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oscargus added the status: needs workflow approval For PRs from new contributors, from which GitHub blocks workflows by default. label Apr 5, 2022

patquem mentioned this pull request May 9, 2022

[ENH] : Provide axis('equal') for Axes3D (replace PR #22705) #23017

Closed

6 tasks

patquem closed this May 9, 2022

patquem force-pushed the main branch from e5b492e to 6b2d3f2 Compare May 9, 2022 10:06

QuLogic added the status: duplicate label May 9, 2022

liuzhenqi77 mentioned this pull request Nov 17, 2022

Update aspect parameter in plot_point_brain netneurolab/netneurotools#122

Open

	'equal' automatic; adapt the axes to have equal aspect
	'equal' automatic; adapt the axes to have equal aspect.

	if aspect not in ['auto', 'equal']:
	if aspect not in ('auto', 'equal'):

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patquem commented Mar 25, 2022 •

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