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Merge pull request #8776 from kbrose/updated-downsampling
Updated downsampling
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‎doc/users/whats_new/path_simplification_updates.rst‎

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Path simplification updates
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---------------------------
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Line simplification controlled by the ``path.simplify`` and
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``path.simplify_threshold`` parameters has been improved. You should
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notice better rendering performance when plotting large amounts of
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data (as long as the above parameters are set accordingly). Only the
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line segment portion of paths will be simplified -- if you are also
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drawing markers and experiencing problems with rendering speed, you
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should consider using the ``markevery`` option to ``plot``.
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See the :ref:`performance` section in the usage tutorial for more
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information.
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The simplification works by iteratively merging line segments
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into a single vector until the next line segment's perpendicular
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distance to the vector (measured in display-coordinate space)
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is greater than the ``path.simplify_threshold`` parameter. Thus, higher
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values of ``path.simplify_threshold`` result in quicker rendering times.
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If you are plotting just to explore data and not for publication quality,
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pixel perfect plots, then a value of ``1.0`` can be safely used. If you
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want to make sure your plot reflects your data *exactly*, then you should
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set ``path.simplify`` to false and/or ``path.simplify_threshold`` to ``0``.
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Matplotlib currently defaults to a conservative value of ``1/9``, smaller
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values are unlikely to cause any visible differences in your plots.

‎lib/matplotlib/path.py‎

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return pth
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def _update_values(self):
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self._simplify_threshold = rcParams['path.simplify_threshold']
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self._should_simplify = (
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self._simplify_threshold > 0 and
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rcParams['path.simplify'] and
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(len(self._vertices) >= 128 and
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(self._codes is None or np.all(self._codes <= Path.LINETO)))
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len(self._vertices) >= 128 and
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(self._codes is None or np.all(self._codes <= Path.LINETO))
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)
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self._simplify_threshold = rcParams['path.simplify_threshold']
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self._has_nonfinite = not np.isfinite(self._vertices).all()
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@property

‎lib/matplotlib/tests/baseline_images/test_axes/angle_spectrum_freqs.png‎

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‎lib/matplotlib/tests/baseline_images/test_axes/angle_spectrum_noise.png‎

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