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Development changes
-------------------
Increase to minimum supported versions of Python and dependencies
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For Matplotlib 3.4, the :ref:`minimum supported versions <dependencies>` are
being bumped:
+------------+-----------------+---------------+
| Dependency | min in mpl3.3 | min in mpl3.4 |
+============+=================+===============+
| Python | 3.6 | 3.7 |
+------------+-----------------+---------------+
| dateutil | 2.1 | 2.7 |
+------------+-----------------+---------------+
| numpy | 1.15 | 1.16 |
+------------+-----------------+---------------+
| pyparsing | 2.0.3 | 2.2.1 |
+------------+-----------------+---------------+
This is consistent with our :ref:`min_deps_policy` and `NEP29
<https://numpy.org/neps/nep-0029-deprecation_policy.html>`__
Qhull downloaded at build-or-sdist time
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Much like FreeType, Qhull is now downloaded at build time, or upon creation of
the sdist. To link against system Qhull, set the ``system_qhull`` option to
`True` in the :file:`setup.cfg` file. Note that Matplotlib now requires the
re-entrant version of Qhull (``qhull_r``).
``FigureBase`` class added, and ``Figure`` class made a child
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The new subfigure feature motivated some re-organization of the
`.figure.Figure` class, so that the new `.figure.SubFigure` class could have
all the capabilities of a figure.
The `.figure.Figure` class is now a subclass of `.figure.FigureBase`, where
`.figure.FigureBase` contains figure-level artist addition routines, and the
`.figure.Figure` subclass just contains features that are unique to the outer
figure.
Note that there is a new *transSubfigure* transform associated with the
subfigure. This transform also exists for a `.Figure` instance, and is equal
to *transFigure* in that case, so code that uses the transform stack that wants
to place objects on either the parent figure or one of the subfigures should
use *transSubfigure*.
|
