[Matplotlib-users] Creating Colored Axis Labels using LaTeX in Interactive Mode

[Joseph Fox-Rabinovitz]

Thanks for the catch with `\usepackage{dashrule}`. Using matplotlib
1.5, the code you posted does not work as expected. The labels are the
literal strings containing LaTeX commands, not the LaTeX output.
Adding in the commands under `# Text config` fixed at least that part
of the issue. It seems to be caused by the fact that I am using a
non-pgf backend by default.

Regards,

    -Joe



On Mon, Jul 11, 2016 at 12:35 PM, Jens Nielsen <jenshnielsen at gmail.com> wrote:
> I can confirm that this does not work as expected but I don't know exactly
> why.
>
> With regards to your pgf example. It seems to be missing a
> \usepackage{dashrule}
>
> The following runs for me but still generates the black non colored bars.
> The # Text config seems to do nothing in my test so I'm not sure why you
> need to set it.
>
> If I save the pgf backend to a .pgf file and include it in a texfile as
> below everything looks correct in that example
>
> test.py
> ```
> import matplotlib
> from matplotlib.backends.backend_pgf import FigureCanvasPgf
> matplotlib.backend_bases.register_backend('png', FigureCanvasPgf)
> from matplotlib import pyplot as plt
>
> matplotlib.rc('pgf', texsystem='pdflatex')  # from running latex -v
> preamble = matplotlib.rcParams.setdefault('pgf.preamble', [])
> preamble.append(r'\usepackage{color}')
> preamble.append(r'\usepackage{dashrule}')
>
> # Text config
> #matplotlib.rc('text', usetex=True)
> # preamble = matplotlib.rcParams.setdefault('text.latex.preamble', [])
> #preamble.append(r'\usepackage{color}')
> #preamble.append(r'\usepackage{dashrule}')
>
> ax = plt.plot((0, 1), (1, 2))[0].axes
> ax.set_ylabel(r'Y $\;$ \textcolor[rgb]{1.0, 0.0,
> 0.0}{\hdashrule[0.5ex]{3cm}{1pt}{1pt 0pt}}')
> ax.set_xlabel(r'N $\;$ \textcolor[rgb]{0.0, 1.0,
> 0.0}{\rule[0.5ex]{3cm}{1pt}}')
> plt.savefig('test.pgf')
> plt.savefig('test.png')
> ```
>
> test.tex
> ```
> \documentclass{article}
>
> \usepackage[utf8]{inputenc}
> \usepackage[english]{babel}
>
> \usepackage{color}
> \usepackage{dashrule}
> \usepackage{pgf}
>
> \begin{document}
>
> \input{test.pgf}
> \end{document}
> ```
>
> and running pdflatex test.tex generates a test.pdf that looks as expected.
>
> best
> Jens
>
>
>
> On Mon, 11 Jul 2016 at 17:08 Joseph Fox-Rabinovitz
> <jfoxrabinovitz at gmail.com> wrote:
>>
>> Have an update on my previous question. I have tried to follow the
>> instructions at http://matplotlib.org/users/pgf.html for settting up
>> the PGF backend for PNG and PDF rendering. This method does not work
>> either:
>>
>>     import matplotlib as mpl
>>     from matplotlib.backends.backend_pgf import FigureCanvasPgf
>>     matplotlib.backend_bases.register_backend('png', FigureCanvasPgf)
>>     from matplotlib import pyplot as plt
>>
>>     matplotlib.rc('pgf', texsystem='pdflatex')  # from running latex -v
>>     preamble = matplotlib.rcParams.setdefault('pgf.preamble', [])
>>     preamble.append(r'\usepackage{color}')
>>
>>     # Text config
>>     matplotlib.rc('text', usetex=True)
>>     preamble = matplotlib.rcParams.setdefault('text.latex.preamble', [])
>>     preamble.append(r'\usepackage{color}')
>>
>>     ax = plt.plot((0, 1), (1, 2))[0].axes
>>     ax.set_ylabel(r'Y $\;$ \textcolor[rgb]{1.0, 0.0,
>> 0.0}{\hdashrule[0.5ex]{3cm}{1pt}{1pt 0pt}}')
>>     ax.set_xlabel(r'N $\;$ \textcolor[rgb]{0.0, 1.0,
>> 0.0}{\rule[0.5ex]{3cm}{1pt}}')
>>     plt.savefig('test.png')
>>
>> Yields the exact same figure and PNG file with the incorrect black
>> lines as above. Note that turning off the three lines under `# Text
>> config` makes the TeX commands print out verbatim, even in the saved
>> figure. Perhaps there is a way to render the PNG correctly without
>> pre-clobbering with the text system?
>>
>> Regards,
>>
>>     -Joe
>>
>>
>>
>> On Mon, Jul 11, 2016 at 11:12 AM, Joseph Fox-Rabinovitz
>> <jfoxrabinovitz at gmail.com> wrote:
>> > I originally posted to Stack Overflow at
>> > http://stackoverflow.com/q/38274681/2988730 (and accidentally to the
>> > SourceForge version of this list).
>> >
>> > I am trying to follow the answer at
>> > http://stackoverflow.com/a/38008501/2988730 to an earlier question of
>> > mine to create colored and styled legend-like entries. I have the
>> > following code:
>> >
>> >     import matplotlib as mpl
>> >     mpl.use('ps')
>> >     from matplotlib import pyplot as plt
>> >
>> >     mpl.rc('text', usetex=True)
>> >     mpl.rc('text.latex',
>> > preamble='\\usepackage{color}\n\\usepackage{dashrule}')
>> >
>> >     plt.ion()
>> >     ax = plt.plot((0, 1), (1, 2))[0].axes
>> >     ax.set_ylabel(r'Y $\;$ \textcolor[rgb]{1.0, 0.0,
>> > 0.0}{\hdashrule[0.5ex]{3cm}{1pt}{1pt 0pt}}')
>> >     ax.set_xlabel(r'N $\;$ \textcolor[rgb]{0.0, 1.0,
>> > 0.0}{\rule[0.5ex]{3cm}{1pt}}')
>> >     plt.savefig('test.ps')
>> >
>> > The result is as expected. The labels contain black text with a red
>> > line on the Y label and a green line on the X label:
>> > http://i.stack.imgur.com/JCiLI.png.
>> >
>> > However, when I try the exact same set of commands without the
>> > `mpl.use('ps')` line (using `'qt4agg'` backend on my system), the
>> > figure neither saves corectly nor shows up correctly on screen:
>> >
>> >     import matplotlib as mpl
>> >     from matplotlib import pyplot as plt
>> >
>> >     mpl.rc('text', usetex=True)
>> >     mpl.rc('text.latex',
>> > preamble='\\usepackage{color}\n\\usepackage{dashrule}')
>> >
>> >     plt.ion()
>> >     ax = plt.plot((0, 1), (1, 2))[0].axes
>> >     ax.set_ylabel(r'Y $\;$ \textcolor[rgb]{1.0, 0.0,
>> > 0.0}{\hdashrule[0.5ex]{3cm}{1pt}{1pt 0pt}}')
>> >     ax.set_xlabel(r'N $\;$ \textcolor[rgb]{0.0, 1.0,
>> > 0.0}{\rule[0.5ex]{3cm}{1pt}}')
>> >
>> >     plt.savefig('test.png')
>> >     plt.show()
>> >
>> > The result of `plt.savefig` (http://i.stack.imgur.com/h2LXn.png) and
>> > `plt.show` (http://i.stack.imgur.com/0Ow7c.png) are basically the same
>> > in this case. The lines after the text show up black.
>> >
>> > How do I get the colors to show up in the labels with the default
>> > interactive backend?
>> >
>> > Regards,
>> >
>> >     -Joe
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