Question

当我想将matplotlib图导出到svg文件时，我发现了一个问题。如果标签/标题包含连字形（例如fl in flow），则不会将其导出到svg文件。如果我保存为pdf，那就可以了。

这是matplotlib的屏幕截图：

这是svg文件（由CorelDraw转换为png）：在标题和y标签中缺少fl。

以下是可正常工作的python代码，可重现绘图：

import numpy as np
import matplotlib.pyplot as plt

# Example data
t = np.arange(0.0, 1.0 + 0.01, 0.01)
s = np.cos(4 * np.pi * t) + 2

from matplotlib import rc
rc("pdf", fonttype=3)
rc('font',**{'family':'serif','serif':['Times']})
rc('text', usetex=True)

plt.plot(t, s)

plt.xlabel('Time [s]')
plt.ylabel('Mass flow rate [kg/s]')
plt.title("Example with flow")

plt.savefig('tex_demo.pdf', format='pdf')
plt.savefig('tex_demo.svg', format='svg')
plt.show()

运行脚本时，会收到一堆警告消息，如果标签中没有fl-glyph，也会出现这些警告消息：

C:\WinPython-64bit-3.6.5.0Qt5\python-3.6.5.amd64\lib\site-packages\matplotlib\textpath.py:389: UserWarning: The glyph (48) of font (C:/Program Files/MiKTeX 2.9/fonts/type1/urw/times/utmr8a.pfb) cannot be converted with the encoding. Glyph may be wrong
"be wrong" % (glyph, font_bunch.filename))
C:\WinPython-64bit-3.6.5.0Qt5\python-3.6.5.amd64\lib\site-packages\matplotlib\textpath.py:389: UserWarning: The glyph (50) of font (C:/Program Files/MiKTeX 2.9/fonts/type1/urw/times/utmr8a.pfb) cannot be converted with the encoding. Glyph may be wrong
"be wrong" % (glyph, font_bunch.filename))

可能是什么原因？

添加：问题在某种程度上与字体Times的用法有关（在我的情况下是强制性的，usetex = True的用法也是强制性的，因为我需要在我的全部问题中绘制公式）。如果我切换到标准TeX字体，则不会发生任何问题：

from matplotlib import rc
rc("pdf", fonttype=3)
rc('font',**{'family':'serif'})
rc('text', usetex=True)

对我来说，如果fl由两个单独的字形f和l导出，则将是一个足够的解决方案。

根据要求，我添加了svg文件（由于30000个字符的stackoverflow限制，因此采用简化形式）。所有字符都将传输到文件中的曲线。搜索“流速”以在代码段中找到对应的部分。

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
  "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<!-- Created with matplotlib (http://matplotlib.org/) -->
<svg height="345.6pt" version="1.1" viewBox="0 0 460.8 345.6" width="460.8pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
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  <style type="text/css">
*{stroke-linecap:butt;stroke-linejoin:round;}
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当matplotlib导出到svg时，为什么连字标志符'fl'丢失了？

0 个答案: