Release notes from matplotlib

REL: v3.4.2

2021-05-08T03:33:19Z

This is the second bugfix release of the 3.4.x series.

This release contains several critical bug-fixes:

Generate wheels usable on older PyPy7.3.{0,1}
Fix compatibility with Python 3.10
Add subplot_mosaic Axes in the order the user gave them to us
Correctly handle 'none' facecolors in do_3d_projection
Ensure that Matplotlib is importable even if there's no HOME
Fix CenteredNorm with halfrange
Fix bar_label for bars with nan values
Fix clip paths when zoomed such that they are outside the figure
Fix creation of RangeSlider with valinit
Fix handling of "d" glyph in backend_ps, fixing EPS output
Fix handling of datetime coordinates in pcolormesh with Pandas
Fix processing of some errorbar arguments
Fix removal of shared polar Axes
Fix resetting grid visibility
Fix subfigure indexing error and tight bbox
Fix textbox cursor color
Fix TkAgg event loop error on window close
Ignore errors for sip with no setapi (Qt4Agg import errors)

REL: v3.4.1

2021-03-31T07:20:53Z

This is the first bugfix release of the 3.4.x series.

This release contains several critical bug-fixes:

fix errorbar when specifying fillstyle
fix Inkscape cleanup at exit on Windows for tests
fix legends of colour-mapped scatter plots
fix positioning of annotation fancy arrows
fix size and color rendering for 3D scatter plots
fix suptitle manual positioning when using constrained layout
respect antialiasing settings in cairo backends as well

REL: v3.4.0

2021-03-26T05:11:13Z

Highlights of this release include:

Figure and Axes creation / management
- New subfigure functionality
- Single-line string notation for subplot_mosaic
- Changes to behavior of Axes creation methods (gca, add_axes,
  add_subplot)
- add_subplot/add_axes gained an axes_class parameter
- Subplot and subplot2grid can now work with constrained layout
Plotting methods
- axline supports transform parameter
- New automatic labeling for bar charts
- A list of hatches can be specified to bar and barh
- Setting BarContainer orientation
- Contour plots now default to using ScalarFormatter
- Axes.errorbar cycles non-color properties correctly
- errorbar errorevery parameter matches markevery
- hexbin supports data reference for C parameter
- Support callable for formatting of Sankey labels
- Axes.spines access shortcuts
- New stairs method and StepPatch artist
- Added orientation parameter for stem plots
- Angles on Bracket arrow styles
- TickedStroke patheffect
Colors and colormaps
- Collection color specification and mapping
- Transparency (alpha) can be set as an array in collections
- pcolormesh has improved transparency handling by enabling snapping
- IPython representations for Colormap objects
- Colormap.set_extremes and Colormap.with_extremes
- Get under/over/bad colors of Colormap objects
- New cm.unregister_cmap function
- New CenteredNorm for symmetrical data around a center
- New FuncNorm for arbitrary normalizations
- GridSpec-based colorbars can now be positioned above or to the
  left of the main axes
Titles, ticks, and labels
- supxlabel and supylabel
- Shared-axes subplots tick label visibility is now correct for top
  or left labels
- An iterable object with labels can be passed to Axes.plot
Fonts and Text
- Text transform can rotate text direction
- matplotlib.mathtext now supports overset and underset LaTeX
  symbols
- math_fontfamily parameter to change Text font family
- TextArea/AnchoredText support horizontalalignment
- PDF supports URLs on Text artists
rcParams improvements
- New rcParams for dates: set converter and whether to use
  interval_multiples
- Date formatters now respect usetex rcParam
- Setting image.cmap to a Colormap
- Tick and tick label colors can be set independently using rcParams
3D Axes improvements
- Errorbar method in 3D Axes
- Stem plots in 3D Axes
- 3D Collection properties are now modifiable
- Panning in 3D Axes
Interactive tool improvements
- New RangeSlider widget
- Sliders can now snap to arbitrary values
- Pausing and Resuming Animations
Sphinx extensions
- plot_directive caption option
Backend-specific improvements
- Consecutive rasterized draws now merged
- Support raw/rgba frame format in FFMpegFileWriter
- nbAgg/WebAgg support middle-click and double-click
- nbAgg support binary communication
- Indexed color for PNG images in PDF files when possible
- Improved font subsettings in PDF/PS
- Kerning added to strings in PDFs
- Fully-fractional HiDPI in QtAgg
- wxAgg supports fullscreen toggle

REL: v3.4.0rc3

2021-03-11T04:46:17Z

This is the third release candidate for Matplotlib 3.4.0.

REL: v3.4.0rc2

2021-03-11T01:03:04Z

This is the second release candidate for Matplotlib 3.4.0.

REL: v3.4.0rc1

2021-02-19T05:19:06Z

This is the first release candidate for Matplotlib 3.4.0.

REL: v3.3.4

2021-01-28T07:27:56Z

This is the fourth bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

Fix WebAgg initialization.
Fix parsing QT_API setting with mixed case.
Fix build with LTO disabled in environment.
Fix test compatibility with Python 3.10.
Fix test compatibility with NumPy 1.20.
Fix test compatibility with pytest 6.2.

REL: v3.3.3

2020-11-12T03:53:02Z

This is the third bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

Fix calls to Axis.grid with argument visible=True.
Fix fully masked imshow.
Fix inconsistent color mapping in scatter for 3D plots.
Fix notebook/nbAgg figures when used with ipywidgets in the same cell.
Fix notebook/nbAgg/WebAgg on older (e.g., Firefox ESR) browsers.
Fix pcolormesh with datetime coordinates.
Fix performance regression with datetimes.
Fix singular ticks with small log ranges.
Fix timers/animations on wx and notebook backends.
Remove certifi as a hard runtime dependency.

REL: v3.3.2

2020-09-15T06:43:41Z

This is the second bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

fix Axis scale on twinned Axes
fix auto-close of Figures in nbagg
fix automatic title placement if Axes is off the Figure
fix autoranging of log scales with barstacked histogram
fix extra redraws when using Button or TextBox widgets
fix imshow with LogNorm and large vmin/vmax ranges
fix plotting Pandas DataFrame with string MultiIndex
fix scatter with marker=''
fix scatter3d color/linewidth re-projection
fix state of mode buttons in TkAgg backends
include license files in built distribution
reduce Visual C++ runtime requirements on Windows

REL: v3.3.1

2020-08-14T00:25:49Z

This is the first bugfix release of the 3.3.x series.

This release contains several critical bug-fixes:

fix docstring import issues when running Python with optimization
fix hist with categorical data, such as with Pandas
fix install on BSD systems
fix nbagg compatibility with Chrome 84+
fix ordering of scatter marker size in 3D plots
fix performance regression when plotting Paths
fix reading from URL in imread
fix several regressions with new date epoch handling
fix some bad constrained and tight layout interactions with colorbars
fix use of customized toolbars in TkAgg and WXAgg backends