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Wrong figure height after set_size_inches within event handler #10083

bwohlberg opened this Issue Dec 24, 2017 · 1 comment


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bwohlberg commented Dec 24, 2017

Bug report

Bug summary

When calling set_size_inches within an event handler, the new figure width is as requested, but the new height is not. This occurs with the TkAgg backend, but not the Qt5Agg backend (which suggests that this issue may not be related to #7302, since that issue is also reported to occur with Qt5Agg).

Code for reproduction

import matplotlib.pyplot as plt

fig = plt.figure(figsize=(8, 6))
def press(event):
    print('Before resize, size is ', fig.get_size_inches())
    sz = 1.1 * fig.get_size_inches()
    print('Size will be set to ', sz)
    fig.set_size_inches(sz, forward=True)
    print('After resize, size is ', fig.get_size_inches())
fig.canvas.mpl_connect('key_press_event', press)


Pressing any key while the cursor is within the figure will attempt to resize the figure. The requested and actual sizes are printed to the console. If

import matplotlib

is added at the start of this example, resizing behaves as expected.

Matplotlib version

  • Operating system: Ubuntu 16.04 64 bit
  • Matplotlib version: 2.1.1 (installed with pip)
  • Matplotlib backend: TkAgg
  • Python version: 3.5 (Ubuntu packaged version)

@tacaswell tacaswell added this to the v2.2 milestone Dec 24, 2017

@tacaswell tacaswell added the GUI/tk label Dec 24, 2017


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tacaswell commented Dec 24, 2017

This is likely the same issue, on changing the size of the figure we change the size of the window to fit the figure + the toolbar and on window resize adjust the figure to the space it actually has. I suspect that the issue is we are incorrectly accounting for the toolbar size (which fits with it being backend dependent as the exact details of that logic is GUI framework dependent.

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