Matplotlib标记文本会根据字符数更改大小，我如何找出原因

Question

marker font seems to have a sizing algorithm dependent on length. I want to research this myself BUT don't know where to start? The code line is below and I send about 12 symbols to it and the font size changes. How do I step through this problem and find the root cause for it please?

plt.plot(x,y,lw=2.5,color='g',linestyle='solid',marker=r"$\mathsf{%s}$" % symbol, markersize=30,
     markeredgewidth=1, markeredgecolor='k' , markerfacecolor= 'None')

here is the output from sending 12 different symbols to it ie AAPL, AIG,C

Answer 1

If you vary markersize with the number of characters, the font is the same size:

for t in (1,2,3):
    plt.plot([t*a for a in x], y, marker=r"$\mathsf{%s}$" % (t*'A'), markersize=10*t)

I guess the width is constant either if specified as a constant or if unspecified (must be a constant default) and the font size gets adjusted to fit.

Now, how to have figured that out... I kept throwing things out to make a minimal complete example, and just looked at what changed and thought about it.

Answer 2

so I FINALLY found a possible explanation to my problem by THINKING about what I was REALLY asking. I found the answer

"This can be a somewhat confusing way of defining the size but you are basically specifying the area of the marker. This means, to double the width (or height) of the marker you need to increase s by a factor of 4. [because A = WH => (2W)(2H)=4A] "

here.

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