scikitplot.externals._sphinxext.plot_directive#

A directive for including a Matplotlib plot in a Sphinx document.

This is a Sphinx extension providing a reStructuredText directive .. plot:: for including a plot in a Sphinx document.

In HTML output, .. plot:: will include a .png file with a link to a high-res .png and .pdf. In LaTeX output, it will include a .pdf.

The plot content may be defined in one of three ways:

  1. A path to a source file as the argument to the directive:

    .. plot:: path/to/plot.py

    When a path to a source file is given, the content of the directive may optionally contain a caption for the plot:

    .. plot:: path/to/plot.py

   The plot caption.

    Additionally, one may specify the name of a function to call (with no arguments) immediately after importing the module:

    .. plot:: path/to/plot.py plot_function1

  2. Included as inline content to the directive:

    .. plot::

   import matplotlib.pyplot as plt
   plt.plot([1, 2, 3], [4, 5, 6])
   plt.title("A plotting example")

  3. Using doctest syntax:

    .. plot::

   A plotting example:
   >>> import matplotlib.pyplot as plt
   >>> plt.plot([1, 2, 3], [4, 5, 6])

Options:

The .. plot:: directive supports the following options:

:filename-prefix:str

The base name (without the extension) of the outputted image and script files. The default is to use the same name as the input script, or the name of the RST document if no script is provided. The filename-prefix for each plot directive must be unique.

:format:{‘python’, ‘doctest’}

The format of the input. If unset, the format is auto-detected.

:include-source:bool

Whether to display the source code. The default can be changed using the plot_include_source variable in conf.py (which itself defaults to False).

:show-source-link:bool

Whether to show a link to the source in HTML. The default can be changed using the plot_html_show_source_link variable in conf.py (which itself defaults to True).

:context:bool or str

If provided, the code will be run in the context of all previous plot directives for which the :context: option was specified. This only applies to inline code plot directives, not those run from files. If the :context: reset option is specified, the context is reset for this and future plots, and previous figures are closed prior to running the code. :context: close-figs keeps the context but closes previous figures before running the code.

:nofigs:bool

If specified, the code block will be run, but no figures will be inserted. This is usually useful with the :context: option.

:caption:str

If specified, the option’s argument will be used as a caption for the figure. This overwrites the caption given in the content, when the plot is generated from a file.

Additionally, this directive supports all the options of the image directive, except for :target: (since plot will add its own target). These include :alt:, :height:, :width:, :scale:, :align: and :class:.

Configuration options:

The plot directive has the following configuration options:

plot_include_source

Default value for the include-source option (default: False).

plot_html_show_source_link

Whether to show a link to the source in HTML (default: True).

plot_pre_code

Code that should be executed before each plot. If None (the default), it will default to a string containing:

import numpy as np
from matplotlib import pyplot as plt
plot_basedir

Base directory, to which plot:: file names are relative to. If None or empty (the default), file names are relative to the directory where the file containing the directive is.

plot_formats

File formats to generate (default: [‘png’, ‘hires.png’, ‘pdf’]). List of tuples or strings:

[(suffix, dpi), suffix, ...]

that determine the file format and the DPI. For entries whose DPI was omitted, sensible defaults are chosen. When passing from the command line through sphinx_build the list should be passed as suffix:dpi,suffix:dpi, …

plot_html_show_formats

Whether to show links to the files in HTML (default: True).

plot_rcparams

A dictionary containing any non-standard rcParams that should be applied before each plot (default: {}).

plot_apply_rcparams

By default, rcParams are applied when :context: option is not used in a plot directive. If set, this configuration option overrides this behavior and applies rcParams before each plot.

plot_working_directory

By default, the working directory will be changed to the directory of the example, so the code can get at its data files, if any. Also its path will be added to sys.path so it can import any helper modules sitting beside it. This configuration option can be used to specify a central directory (also added to sys.path) where data files and helper modules for all code are located.

plot_template

Provide a customized template for preparing restructured text.

plot_srcset

Allow the srcset image option for responsive image resolutions. List of strings with the multiplicative factors followed by an “x”. e.g. [“2.0x”, “1.5x”]. “2.0x” will create a png with the default “png” resolution from plot_formats, multiplied by 2. If plot_srcset is specified, the plot directive uses the matplotlib.sphinxext.figmpl_directive (instead of the usual figure directive) in the intermediary rst file that is generated. The plot_srcset option is incompatible with singlehtml builds, and an error will be raised.

Notes on how it works:

The plot directive runs the code it is given, either in the source file or the code under the directive. The figure created (if any) is saved in the sphinx build directory under a subdirectory named plot_directive. It then creates an intermediate rst file that calls a .. figure: directive (or .. figmpl:: directive if plot_srcset is being used) and has links to the *.png files in the plot_directive directory. These translations can be customized by changing the plot_template. See the source of matplotlib.sphinxext.plot_directive for the templates defined in TEMPLATE and TEMPLATE_SRCSET.

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