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

[Jens Nielsen]

You are right. I suspect that the register_backend logic does not work
correctly for png. The code produces the expected results
in pdf with register_backend and in both pdf and png if I do
matplotlib.use('pgf')
so it would seem like there are at least 2 different bugs.

The color does not work with the regular latex text backend.

register_backend does not work correctly with png and the pgf backend.

best
Jens




On Mon, 11 Jul 2016 at 18:49 Joseph Fox-Rabinovitz <jfoxrabinovitz at gmail.com>
wrote:

> 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
> >> _______________________________________________
> >> Matplotlib-users mailing list
> >> Matplotlib-users at python.org
> >> https://mail.python.org/mailman/listinfo/matplotlib-users
>
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