Inserting a unicode text into pyx canvas

Question

I have a set of UTF-8 characters that I would like to insert into a PyX generated pdf file. I have included # -*- coding: utf-8 -*- to top of the file. The code is somewhat similar to the following:

# -*- coding: utf-8 -*-
c = canvas.canvas()
txt = "u'aあä'"
c.text(2, 2, "ID: %s"%txt)
c.writeEPSfile("filename.eps")

But I still can't get my head around this.

Error:

'ascii' codec can't encode character u'\xae' in position 47: ordinal not in range(128)

Show us the code about inserting some content into a pdf file. — Stephen Lin, Oct 21 '14 at 08:35

Stephen Lin · Answer 1 · 2014-10-21T08:54:30.580

1

Try this:

# -*- coding: utf-8 -*-
c = canvas.canvas()
txt = u'aあä'.encode('utf-8')
c.text(1, 4, "UID: %s"%(txt))
c.writeEPSfile("filename.eps")

edited Oct 21 '14 at 08:54

answered Oct 21 '14 at 08:44

Stephen Lin

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I again get an error : 'ascii' codec can't decode byte 0xe3 in position 3: ordinal not in range(128) – pariwesh Oct 21 '14 at 08:53
@user3280299 Check my update. You have to do encode with a unicode object. – Stephen Lin Oct 21 '14 at 08:54
I added your edit to the code but I still get the above error – pariwesh Oct 21 '14 at 08:56
@user3280299 Can you update the whole traceback error message in your question to show me where did the error happen? – Stephen Lin Oct 21 '14 at 09:08

score 1 · Answer 2 · edited Apr 13 '17 at 12:34

You can setup PyX to pass unicode characters to (La)TeX. Then it all becomes a problem to produce the characters in question within TeX/LaTeX. Here is a rather minimal solution to produce the output in question:

from pyx import *

text.set(cls=text.LatexRunner, texenc='utf-8')
text.preamble(r'\usepackage[utf8]{inputenc}')
text.preamble(r'\usepackage{newunicodechar}')
text.preamble(r"\newunicodechar{あ}{{\usefont{U}{min}{m}{n}\symbol{'102}}}") 
text.preamble(r'\DeclareFontFamily{U}{min}{}')
text.preamble(r'\DeclareFontShape{U}{min}{m}{n}{<-> udmj30}{}')

c = canvas.canvas()
c.text(0, 0, 'UID: aあä')
c.writeGSfile('utf8.png')

This directly results in the output (as PNG as uploaded here): program output

Note that this was done using PyX 0.13 on Python 3 and a rather standard LaTeX installation. Also, I used some information from https://tex.stackexchange.com/questions/171611/how-to-write-a-single-hiragana-character-in-latex about creating those characters in LaTeX. There seem to be solutions like CJKutf8 to setup all kind of characters for direct use as unicode characters within LaTeX, but this is way out of my experience. Anyway, it should all work fine from within PyX like it does from LaTeX itself if all the setup has been done properly. Good luck!

score 1 · Answer 3 · edited May 13 '16 at 12:24

Maybe you can find an according set from the babel package I ran into the same error when I tried to insert the german ä (a umlaut). I simply added the german babel package:

text.preamble(r"\usepackage[ngerman]{babel}")

After that, this was possible without errors:

c.text(12, 34, "äöüßß")

I also used an utf8 input encoding, I think this it is necessary as well.

Further reading:
https://en.wikibooks.org/wiki/LaTeX/Internationalization
https://en.wikibooks.org/wiki/LaTeX/Fonts

Inserting a unicode text into pyx canvas

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