Layout Templates and matplotlib figures

see #117 (issue) and #174 (PR) for some discussion on the topic.

@martinRenou I have been playing with using Layout Templates to stack figures in fun ways. Unfortunately, since matplotlib is currently responsible for the figure size, I end up with situations such as the following, where the figures are all cut off a bit. This is particularly noticable in jupyter notebook since the screen width is reduced.

In the following example, I stack a 4x4 of buttons and then a 4x4 of figures. The buttons stretch nicely, but the figures do not.

%matplotlib widget
import matplotlib.pyplot as plt
from ipywidgets import TwoByTwoLayout
from ipywidgets.widgets import Button, Layout

# Buttons
def button(name):
    return Button(description = name, layout=Layout(height='auto', width='auto'))

a,b,c,d =  button("1"), button("2"), button("3"), button("4"),
layout_2x2 = TwoByTwoLayout(top_left=a, 
                            top_right=b,
                            bottom_left=c,
                            bottom_right=d)
display(layout_2x2)

# Figures
figs = []
plt.ioff()
for i in range(4):
    fig, ax = plt.subplots()
    ax.imshow([[1,2], [3,4]])
    figs.append(fig.canvas)

a,b,c,d = figs

layout_2x2 = TwoByTwoLayout(top_left=a, 
                            top_right=b,
                            bottom_left=c,
                            bottom_right=d)
display(layout_2x2)

In jupyter lab the problem is less so, but still unfortunate that figures basically ignore the flexbox layout the widgets are designed with. I would set the size with matplotlib, but since I don't know the size of the viewport the user is using, it's likely that the size I choose will be too small or too large depending on the user.

I don't have a concrete solution at hand, but I'm wondering if we can come up with some logic that preserves aspect ratio but otherwise fills a widget to its fullest extent?

Bắt đầu bằng cách tái hiện ví dụ Layout Templates trong issue trên Jupyter Notebook và JupyterLab, sau đó đọc phần thảo luận trong #117 và công việc hiện có trong #174. Kết quả mong muốn vẫn chưa được xác định; hãy làm rõ một cách tiếp cận cho phép các figure của matplotlib lấp đầy widget layout trong khi vẫn giữ nguyên tỷ lệ khung hình của chúng, sau đó xác định cách cần kiểm chứng hành vi này.