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Source code for matplotlib.projections

from __future__ import (absolute_import, division, print_function,

import six

from .geo import AitoffAxes, HammerAxes, LambertAxes, MollweideAxes
from .polar import PolarAxes
from matplotlib import axes

[docs]class ProjectionRegistry(object): """ Manages the set of projections available to the system. """ def __init__(self): self._all_projection_types = {}
[docs] def register(self, *projections): """ Register a new set of projection(s). """ for projection in projections: name = self._all_projection_types[name] = projection
[docs] def get_projection_class(self, name): """ Get a projection class from its *name*. """ return self._all_projection_types[name]
[docs] def get_projection_names(self): """ Get a list of the names of all projections currently registered. """ return sorted(self._all_projection_types)
projection_registry = ProjectionRegistry() projection_registry.register( axes.Axes, PolarAxes, AitoffAxes, HammerAxes, LambertAxes, MollweideAxes)
[docs]def register_projection(cls): projection_registry.register(cls)
[docs]def get_projection_class(projection=None): """ Get a projection class from its name. If *projection* is None, a standard rectilinear projection is returned. """ if projection is None: projection = 'rectilinear' try: return projection_registry.get_projection_class(projection) except KeyError: raise ValueError("Unknown projection '%s'" % projection)
[docs]def process_projection_requirements(figure, *args, **kwargs): """ Handle the args/kwargs to for add_axes/add_subplot/gca, returning:: (axes_proj_class, proj_class_kwargs, proj_stack_key) Which can be used for new axes initialization/identification. .. note:: **kwargs** is modified in place. """ ispolar = kwargs.pop('polar', False) projection = kwargs.pop('projection', None) if ispolar: if projection is not None and projection != 'polar': raise ValueError( "polar=True, yet projection=%r. " "Only one of these arguments should be supplied." % projection) projection = 'polar' if isinstance(projection, six.string_types) or projection is None: projection_class = get_projection_class(projection) elif hasattr(projection, '_as_mpl_axes'): projection_class, extra_kwargs = projection._as_mpl_axes() kwargs.update(**extra_kwargs) else: raise TypeError('projection must be a string, None or implement a ' '_as_mpl_axes method. Got %r' % projection) # Make the key without projection kwargs, this is used as a unique # lookup for axes instances key = figure._make_key(*args, **kwargs) return projection_class, kwargs, key
[docs]def get_projection_names(): """ Get a list of acceptable projection names. """ return projection_registry.get_projection_names()