SVG export with unicode

[Dane Austin]

Hi all,

I have encountered an error trying to SVG export a figure containing a unicode symbol.

Code:

import pyqtgraph as pg

import pyqtgraph.exporters as pgex

plt1=pg.plot([0,1],[0,1])

plt1.plotItem.setTitle('psi')

exp=pgex.SVGExporter(plt1.plotItem)

exp.export('no_unicode.svg') # works fine

plt2=pg.plot([0,1],[0,1])

plt2.plotItem.setTitle(u'\u03c8(x)') # plot displays with nice greek psi in title

exp=pgex.SVGExporter(plt2.plotItem)

exp.export('unicode.svg') # gives error

Error:

Traceback (most recent call last):

File "/media/dane/hd/code/python/bugs/demo_pyqtgraph_exporter_problem_06012016.py", line 12, in <module>

exp.export('unicode.svg') # gives error

File "/home/dane/hd/code/python/packages/pyqtgraph/exporters/SVGExporter.py", line 52, in export

xml = generateSvg(self.item)

File "/home/dane/hd/code/python/packages/pyqtgraph/exporters/SVGExporter.py", line 75, in generateSvg

node, defs = _generateItemSvg(item)

File "/home/dane/hd/code/python/packages/pyqtgraph/exporters/SVGExporter.py", line 270, in _generateItemSvg

csvg = _generateItemSvg(ch, nodes, root)

File "/home/dane/hd/code/python/packages/pyqtgraph/exporters/SVGExporter.py", line 270, in _generateItemSvg

csvg = _generateItemSvg(ch, nodes, root)

File "/home/dane/hd/code/python/packages/pyqtgraph/exporters/SVGExporter.py", line 193, in _generateItemSvg

doc = xml.parseString(xmlStr)

File "/home/dane/anaconda/lib/python2.7/xml/dom/minidom.py", line 1928, in parseString

return expatbuilder.parseString(string)

File "/home/dane/anaconda/lib/python2.7/xml/dom/expatbuilder.py", line 940, in parseString

return builder.parseString(string)

File "/home/dane/anaconda/lib/python2.7/xml/dom/expatbuilder.py", line 223, in parseString

parser.Parse(string, True)

UnicodeEncodeError: 'ascii' codec can't encode character u'\u03c8' in position 1253: ordinal not in range(128)

I'm not sure if this is a bug or a limitation. Happy to investigate solutions myself if given some pointers.

Dane

[Dane Austin]

Some updates:

1. Supplying HTML to setTitle give the same problem.

2. Changing line 193 from

xmlStr = bytes(arr).decode('utf-8')

to

xmlStr = bytes(arr)#.decode('utf-8')

appears to solve the problem. I can now export plots with Greek letters, subscript and superscript.