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Update docs of GridSpec #15031

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Aug 11, 2019
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Update docs of GridSpec #15031

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43 changes: 30 additions & 13 deletions lib/matplotlib/gridspec.py
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Original file line number Diff line number Diff line change
Expand Up @@ -232,38 +232,42 @@ def _normalize(key, size, axis): # Includes last index.

class GridSpec(GridSpecBase):
"""
Specifies the geometry of the grid that a subplot can be placed in.
A grid layout to place subplots within a figure.

The location of grid is determined by similar way as the SubplotParams.
The location of the grid cells is determined in a similar way to
`~.figure.SubplotParams` using *left*, *right*, *top*, *bottom*, *wspace*
and *hspace*.
"""
def __init__(self, nrows, ncols, figure=None,
left=None, bottom=None, right=None, top=None,
wspace=None, hspace=None,
width_ratios=None, height_ratios=None):
"""
The number of rows and number of columns of the grid need to be set.
Optionally, the subplot layout parameters (e.g., left, right, etc.)
can be tuned.

Parameters
----------
nrows, ncols : int
The number of rows and columns of the grid.

figure : `~.figure.Figure`, optional
Only used for constrained layout to create a proper layoutbox.
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This is better than nothing, but still not too helpful.

@jklymak Maybe you have a better description?


left, right, top, bottom : float, optional
Extent of the subplots as a fraction of figure width or height.
Left cannot be larger than right, and bottom cannot be larger than
top.
top. If not given, the values will be inferred from a figure or
rcParams when necessary. See also `GridSpec.get_subplot_params`.
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@story645 story645 Aug 11, 2019 •
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i think the when necessary is extraneous

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@timhoffm timhoffm Aug 11, 2019 •
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What I wanted to express with that is that it is a delayed evaluation. In contrast to many other default fallbacks GridSpec.left stays None. The paradigm seems to be to use get_subplot_params which will resolve to the given alternatives.

Maybe "at usage time" or something would be better?

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at run time or at draw time or when the figure is being rendered? Those are both a bit more jargony than I like but maybe closer to clearer?

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Thanks. Chosen "at draw time" in #15106.


wspace : float, optional
The amount of width reserved for space between subplots,
expressed as a fraction of the average axis width.
If not given, the values will be inferred from a figure or
rcParams when necessary. See also `GridSpec.get_subplot_params`.

hspace : float, optional
The amount of height reserved for space between subplots,
expressed as a fraction of the average axis height.
If not given, the values will be inferred from a figure or
rcParams when necessary. See also `GridSpec.get_subplot_params`.

width_ratios : array-like of length *ncols*, optional
Defines the relative widths of the columns. Each column gets a
Expand All @@ -275,9 +279,6 @@ def __init__(self, nrows, ncols, figure=None,
relative height of ``height_ratios[i] / sum(height_ratios)``.
If not given, all rows will have the same height.

Notes
-----
See `~.figure.SubplotParams` for descriptions of the layout parameters.
"""
self.left = left
self.bottom = bottom
Expand Down Expand Up @@ -320,7 +321,12 @@ def __setstate__(self, state):

def update(self, **kwargs):
"""
Update the current values.
Update the subplot parameters of the grid.
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@timhoffm timhoffm Aug 11, 2019 •
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I'm more specific which values to update.

But, there's also some position updating of some Axes happening, which I don't understand, so I'm still not describing that.

The last sentence

Values set to None use the rcParams value.

seems to be more like "Values set to None revert the parameter to the default (see get_subplot_params)"?

Unfortunately this behavior is also different from SubplotParams.update.


Parameters:
----------
left, right, top, bottom : float, optional
wspace, hspace : float, optional

Values set to None use the rcParams value.
"""
Expand Down Expand Up @@ -350,8 +356,13 @@ def update(self, **kwargs):

def get_subplot_params(self, figure=None):
"""
Return a dictionary of subplot layout parameters. The default
parameters are from rcParams unless a figure attribute is set.
Return the `~.SubplotParams` for the GridSpec.

In order of precedence the values are taken from

- non-*None* attributes of the GridSpec
- the provided *figure*
- :rc:`figure.subplot.*`
"""
if figure is None:
kw = {k: rcParams["figure.subplot."+k] for k in self._AllowedKeys}
Expand All @@ -364,6 +375,12 @@ def get_subplot_params(self, figure=None):
return subplotpars

def locally_modified_subplot_params(self):
"""
Return a list of the names of the subplot parameters explicitly set
in the GridSpec.

This is a subset of the attributes of `.SubplotParams`.
"""
return [k for k in self._AllowedKeys if getattr(self, k)]

def tight_layout(self, figure, renderer=None,
Expand Down