ColortableRegistry

class metpy.plots.ctables.ColortableRegistry

Manages the collection of color tables.

Provides access to color tables, read collections of files, and generates matplotlib’s Normalize instances to go with the colortable.

Methods Summary

__init__	Initialize self.
add_colortable(fobj, name)	Add a color table from a file to the registry.
clear()
copy()
fromkeys	Create a new dictionary with keys from iterable and values set to value.
get	Return the value for key if key is in the dictionary, else default.
get_colortable(name)	Get a color table from the registry.
get_with_boundaries(name, boundaries)	Get a color table from the registry with a corresponding norm.
get_with_range(name, start, end)	Get a color table from the registry with a corresponding norm.
get_with_steps(name, start, step)	Get a color table from the registry with a corresponding norm.
items()
keys()
pop(k[,d])	If key is not found, d is returned if given, otherwise KeyError is raised
popitem()	2-tuple; but raise KeyError if D is empty.
scan_dir(path)	Scan a directory on disk for color table files and add them to the registry.
scan_resource(pkg, path)	Scan a resource directory for colortable files and add them to the registry.
setdefault	Insert key with a value of default if key is not in the dictionary.
update([E, ]**F)	If E is present and has a .keys() method, then does: for k in E: D[k] = E[k] If E is present and lacks a .keys() method, then does: for k, v in E: D[k] = v In either case, this is followed by: for k in F: D[k] = F[k]
values()

Methods Documentation

__init__()

Initialize self. See help(type(self)) for accurate signature.

add_colortable(fobj, name)

Add a color table from a file to the registry.

Parameters

• fobj (file-like object) – The file to read the color table from

• name (str) – The name under which the color table will be stored

clear() → None. Remove all items from D.

copy() → a shallow copy of D

fromkeys()

Create a new dictionary with keys from iterable and values set to value.

get()

Return the value for key if key is in the dictionary, else default.

get_colortable(name)

Get a color table from the registry.

Parameters

name (str) – The name under which the color table will be stored

Returns

matplotlib.colors.ListedColormap – The color table corresponding to name

get_with_boundaries(name, boundaries)

Get a color table from the registry with a corresponding norm.

Builds a matplotlib.colors.BoundaryNorm using boundaries.

Parameters

• name (str) – The name under which the color table will be stored

• boundaries (array_like) – The list of boundaries for the norm

Returns

matplotlib.colors.BoundaryNorm, matplotlib.colors.ListedColormap – The boundary norm based on boundaries, and the color table itself.

get_with_range(name, start, end)

Get a color table from the registry with a corresponding norm.

Builds a matplotlib.colors.BoundaryNorm using start, end, and the number of colors, based on the color table obtained from name.

Parameters

• name (str) – The name under which the color table will be stored

• start (float) – The starting boundary

• end (float) – The ending boundary

Returns

matplotlib.colors.BoundaryNorm, matplotlib.colors.ListedColormap – The boundary norm based on start and end with the number of colors from the number of entries matching the color table, and the color table itself.

get_with_steps(name, start, step)

Get a color table from the registry with a corresponding norm.

Builds a matplotlib.colors.BoundaryNorm using start, step, and the number of colors, based on the color table obtained from name.

Parameters

• name (str) – The name under which the color table will be stored

• start (float) – The starting boundary

• step (float) – The step between boundaries

Returns

matplotlib.colors.BoundaryNorm, matplotlib.colors.ListedColormap – The boundary norm based on start and step with the number of colors from the number of entries matching the color table, and the color table itself.

items() → a set-like object providing a view on D's items

keys() → a set-like object providing a view on D's keys

pop(k[, d]) → v, remove specified key and return the corresponding value.

If key is not found, d is returned if given, otherwise KeyError is raised

popitem() → (k, v), remove and return some (key, value) pair as a

2-tuple; but raise KeyError if D is empty.

scan_dir(path)

Scan a directory on disk for color table files and add them to the registry.

Parameters

path (str) – The path to the directory with the color tables

scan_resource(pkg, path)

Scan a resource directory for colortable files and add them to the registry.

Parameters

• pkg (str) – The package containing the resource directory

• path (str) – The path to the directory with the color tables

setdefault()

Insert key with a value of default if key is not in the dictionary.

Return the value for key if key is in the dictionary, else default.

update([E, ]**F) → None. Update D from dict/iterable E and F.

If E is present and has a .keys() method, then does: for k in E: D[k] = E[k] If E is present and lacks a .keys() method, then does: for k, v in E: D[k] = v In either case, this is followed by: for k in F: D[k] = F[k]

values() → an object providing a view on D's values