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colorbar resizes in animation #12550

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sakra1 opened this issue Oct 17, 2018 · 4 comments
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colorbar resizes in animation #12550

sakra1 opened this issue Oct 17, 2018 · 4 comments
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@jklymak
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Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions.
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v3.0.1

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@sakra1
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sakra1 commented Oct 17, 2018 •
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Bug report

When animating a 2D plot with a colorbar, updating the color limits in each iteration changes the size of the colorbar. This issue did not exist with matplotlib 2.2.3.

import numpy as np
import matplotlib.pyplot as plt
from scipy.ndimage import laplace


def main():
    time = np.arange(0, 1, 0.01)
    c = np.zeros(shape=(11, 11))
    c[5, 5] = 1

    fig = plt.figure()
    ax = fig.gca()
    im = ax.imshow(c)
    fig.colorbar(im)

    for t in time:
        c += laplace(c) / 10
        im.set_data(c)
        im.set_clim(0, np.max(c))
        plt.pause(0.001)
    plt.show()


if __name__ == "__main__":
    main()

Actual outcome
outcome_matplotlib300

Expected outcome
outcome_matplotlib223

Matplotlib version

  • Operating system: windows 7
  • Matplotlib version: 3.0.0
  • Matplotlib backend (print(matplotlib.get_backend())): TkAgg
  • Python version: 3.7

Python was installed using the latest Anaconda distribution.
@ImportanceOfBeingErnest ImportanceOfBeingErnest added this to the v3.0.x milestone Oct 17, 2018
@ImportanceOfBeingErnest ImportanceOfBeingErnest added the Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions. label Oct 17, 2018
@ImportanceOfBeingErnest
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This bug came in in ENH: adjustable colorbar ticks #9903.

@sakra1
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sakra1 commented Oct 17, 2018

Apologies for my lack of experience with Python, and bug reporting, but I am confused about the #9903 issue. Unfortunately I do not fully grasp that piece of Python code, but also that issue was reported in December 2017 with a Matplotlib version earlier than 2.2.3, which does not reveal the issue I raised above. Are you saying my animation issue is a new but comparable issue that is introduced in Matplotlib 3.0.0?

@ImportanceOfBeingErnest
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@sakra1 Your bug report is fine, thanks for that. To explain a bit on the structure here:

The bug appears first in the development version after #9903 has been merged on 22 March. (This can be found out via git bisect) This commit has been tagged for the 3.0 branch, such that it is not part of the (later) 2.2.3 release. The first release with this bug in it is hence the 3.0.0rc1.

@jklymak jklymak self-assigned this Oct 17, 2018
@jklymak
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jklymak commented Oct 17, 2018

Yes, sorry this broke. I believe it is fixed in #12159 and on master, and will be part of 3.0.1 release in early Nov.

@jklymak jklymak closed this as completed Oct 17, 2018
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