[Bug] The window shrink after using the matplotlib.pyplot.show()

[CaffreyR]

Type of Issue (Enhancement, Error, Bug, Question)

Bug

Operating System

Win10

PySimpleGUI Port (tkinter, Qt, Wx, Web)

tkinter

Versions

Version information can be obtained by calling sg.main_get_debug_data()
Or you can print each version shown in ()

Python version (sg.sys.version)

3.6.2 |Continuum Analytics, Inc.| (default, Jul 20 2017, 12:30:02) [MSC v.1900 64 bit (AMD64)]

PySimpleGUI Version (sg.__version__)

PySimpleGUI version: 4.45.0

GUI Version (tkinter (sg.tclversion_detailed), PySide2, WxPython, Remi)

tkinter version: 8.6.6

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Your Experience In Months or Years (optional)

Years Python programming experience

Years Programming experience overall

Have used another Python GUI Framework? (tkinter, Qt, etc) (yes/no is fine)

Anything else you think would be helpful?

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Troubleshooting

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• For non tkinter - Looked at readme for your specific port if not PySimpleGUI (Qt, WX, Remi)
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Detailed Description

I've defined a button that, when clicked, will call a drawing function and draw a ’plt‘ image. However when the image has been drawn, the entire window will be smaller than it was before, and the font will be smaller.But the function will still work except for the size.Thank you .

Code To Duplicate

A short program that isolates and demonstrates the problem (Do not paste your massive program, but instead 10-20 lines that clearly show the problem)

This pre-formatted code block is all set for you to paste in your bit of code:

# Paste your code here
`def draw_graph(G,alpha,node_scale,figsize):
    plt.rcParams['font.sans-serif'] = ['SimHei']
    plt.figure(figsize=figsize)
    pos = nx.spring_layout(G)
    nx.draw_networkx_nodes(G,pos,node_size=[G.degree[x]*node_scale for x in G.nodes])
    nx.draw_networkx_edges(G,pos,alpha=alpha)
    nx.draw_networkx_labels(G,pos)
    plt.axis("off")
    plt.show()

layout3=[[sg.Button('Social Network'),sg.Button('Exit')]]
window = sg.Window("Social Network demo", layout3)
while True:
     XXXX
     if event =='XXX':
               draw_graph(G_sub, alpha=0.5, node_scale=10, figsize=(6, 4))`

Screenshot, Sketch, or Drawing

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[jason990420]

No executable short code to show what the issue.
I guess the diemnesion of window reduced by a scale when call matplotlib.pyplot.show.

Basically, PySimpleGUI use backend tkinter and Matplotlib use backend Qt5.
You use two different GUIs at the same time, do it only if you know how to handle both of them.

IMO, they use different DPI or Scale for GUI, so you got the odd issue.
Following code may work for you,

import numpy as np
import matplotlib.pyplot as plt
import PySimpleGUI as sg

def set_scale(scale):

    root = sg.tk.Tk()
    root.tk.call('tk', 'scaling', scale)
    root.destroy()

def show():

    x = np.random.randint(low=1, high=11, size=50)
    y = x + np.random.randint(1, 5, size=x.size)
    data = np.column_stack((x, y))

    ax1.scatter(x=x, y=y, marker='o', c='r', edgecolor='b')
    ax1.set_title('Scatter: $x$ versus $y$')
    ax1.set_xlabel('$x$')
    ax1.set_ylabel('$y$')

    ax2.hist(data, bins=np.arange(data.min(), data.max()), label=('x', 'y'))
    ax2.legend(loc=(0.65, 0.8))
    ax2.set_title('Frequencies of $x$ and $y$')
    ax2.yaxis.tick_right()
    plt.show()

sg.theme("DarkBlue3")
sg.set_options(font=("Courier New", 80))

fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2, figsize=(8, 4))
set_scale(fig.dpi/72)       # Set DPI of PySimpleGUI/tkinter to be same as it of Matplotlib/Qt5

layout = [[sg.Button("Show")]]
window = sg.Window('Title', layout, location=(0, 0) , finalize=True)

while True:

    event, values = window.read()
    if event == sg.WINDOW_CLOSED:
        break
    elif event == "Show":
        show()

window.close()

[CaffreyR]

Not executable short code to show what the issue.
I guess the diemnesion of window reduced by a scale when call matplotlib.pyplot.show.

Basically, PySimpleGUI use backend tkinter and Matplotlib use backend Qt5.
You use two different GUIs at the same time, do it only if you know how to handle both of them.

IMO, they use different DPI or Scale for GUI, so you got the odd issue.
Following code may work for you,

import numpy as np
import matplotlib.pyplot as plt
import PySimpleGUI as sg

def set_scale(scale):

    root = sg.tk.Tk()
    root.tk.call('tk', 'scaling', scale)
    root.destroy()

def show():

    x = np.random.randint(low=1, high=11, size=50)
    y = x + np.random.randint(1, 5, size=x.size)
    data = np.column_stack((x, y))

    ax1.scatter(x=x, y=y, marker='o', c='r', edgecolor='b')
    ax1.set_title('Scatter: $x$ versus $y$')
    ax1.set_xlabel('$x$')
    ax1.set_ylabel('$y$')

    ax2.hist(data, bins=np.arange(data.min(), data.max()), label=('x', 'y'))
    ax2.legend(loc=(0.65, 0.8))
    ax2.set_title('Frequencies of $x$ and $y$')
    ax2.yaxis.tick_right()
    plt.show()

sg.theme("DarkBlue3")
sg.set_options(font=("Courier New", 80))

fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2, figsize=(8, 4))
set_scale(fig.dpi/72)       # Set DPI of PySimpleGUI/tkinter to be same as it of Matplotlib/Qt5

layout = [[sg.Button("Show")]]
window = sg.Window('Title', layout, location=(0, 0) , finalize=True)

while True:

    event, values = window.read()
    if event == sg.WINDOW_CLOSED:
        break
    elif event == "Show":
        show()

window.close()

Thanks for replying. My code runs well when I added the ’set_scale‘ function. At least the size of PysimpleGUI window is stable.I'd be appreciate if you could tell me what the function exactly does in this case. I guess it probably locked the setting of tkinter？Thank you again.
def set_scale(scale): root = sg.tk.Tk() root.tk.call('tk', 'scaling', scale) root.destroy() fig=plt.figure(figsize=(8, 4)) set_scale(fig.dpi/36)

[jason990420]

fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2, figsize=(8, 4))
scale = fig.dpi/72            # why you changed it to fig.dpi/36 ?
root = sg.tk.Tk()
root.tk.call('tk', 'scaling', scale)
root.destroy()

Just to set the setting of DPI same in both GUI libraries.
I get the default DPI setting in matplotlib/Qt5, then set the DPI of PySimpleGUI/tkinter to it.

Dots per inch (DPI, or dpi[1]) is a measure of spatial printing, video or image scanner dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch (2.54 cm). Similarly, the more newly introduced[2] dots per centimetre (d/cm or dpcm) refers to the number of individual dots that can be placed within a line of 1 centimetre (≈ 0.393 in).

or, you can get the DPI of PySimpleGUI/tkinter, then set the DPI of Matplotlib/Qt5 to it.
I am not sure how to set DPI of Matplotlib/Qt5.

[PySimpleGUI]

I always thought matplotlib was entirely tkinter based internally. I appreciate the education!

[jason990420]

In following code, you can see there're 21 backends in matplotlib 3.4.2/python 3.9.5 on my WIN10, not only 'TkAgg'.

>>> import matplotlib.rcsetup as rcsetup
>>>
>>> print(rcsetup.interactive_bk)
['GTK3Agg', 'GTK3Cairo', 'MacOSX', 'nbAgg', 'Qt4Agg', 'Qt4Cairo', 'Qt5Agg', 'Qt5Cairo', 'TkAgg', 'TkCairo', 'WebAgg', 'WX', 'WXAgg', 'WXCairo']
>>> print(rcsetup.non_interactive_bk)
['agg', 'cairo', 'pdf', 'pgf', 'ps', 'svg', 'template']
>>> print(rcsetup.all_backends)
['GTK3Agg', 'GTK3Cairo', 'MacOSX', 'nbAgg', 'Qt4Agg', 'Qt4Cairo', 'Qt5Agg', 'Qt5Cairo', 'TkAgg', 'TkCairo', 'WebAgg', 'WX', 'WXAgg', 'WXCairo', 'agg', 'cairo', 'pdf', 'pgf', 'ps', 'svg', 'template']
>>> len(rcsetup.all_backends)
21

[CaffreyR]

fig, (ax1, ax2) = plt.subplots(nrows=1, ncols=2, figsize=(8, 4))
scale = fig.dpi/72            # why you changed it to fig.dpi/36 ?
root = sg.tk.Tk()
root.tk.call('tk', 'scaling', scale)
root.destroy()

Just to set the setting of DPI same in both GUI libraries.
I get the default DPI setting in matplotlib/Qt5, then set the DPI of PySimpleGUI/tkinter to it.

Dots per inch (DPI, or dpi[1]) is a measure of spatial printing, video or image scanner dot density, in particular the number of individual dots that can be placed in a line within the span of 1 inch (2.54 cm). Similarly, the more newly introduced[2] dots per centimetre (d/cm or dpcm) refers to the number of individual dots that can be placed within a line of 1 centimetre (≈ 0.393 in).

or, you can get the DPI of PySimpleGUI/tkinter, then set the DPI of Matplotlib/Qt5 to it.
I am not sure how to set DPI of Matplotlib/Qt5.

Thank you very much! The reason why i changed the parameter is it looks bigger.HAHA! Is it important?

[jason990420]

For the scale factor, you can refer here jason990420/PySimpleGUI-Solution#80

[CaffreyR]

For the scale factor, you can refer here jason990420/PySimpleGUI-Solution#80

Thanks again.I will ask for help if I encounter other problems.

[CaffreyR]

I always thought matplotlib was entirely tkinter based internally. I appreciate the education!

Thank you for the open source code that provides me a learning platform!