#-----------------------------------------------------------------------------
# Copyright (c) Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
''' Models for displaying maps in Bokeh plots.
'''
#-----------------------------------------------------------------------------
# Boilerplate
#-----------------------------------------------------------------------------
from __future__ import annotations
import logging # isort:skip
log = logging.getLogger(__name__)
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# Bokeh imports
from ..core.enums import MapType
from ..core.has_props import abstract
from ..core.properties import (
JSON,
Bool,
Bytes,
Enum,
Float,
Instance,
InstanceDefault,
Int,
Nullable,
Override,
Required,
String,
)
from ..core.validation import error, warning
from ..core.validation.errors import (
INCOMPATIBLE_MAP_RANGE_TYPE,
MISSING_GOOGLE_API_KEY,
REQUIRED_RANGE,
)
from ..core.validation.warnings import MISSING_RENDERERS
from ..model import Model
from ..models.ranges import Range1d
from .plots import Plot
#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------
__all__ = (
'GMapOptions',
'GMapPlot',
'MapOptions',
'MapPlot',
)
#-----------------------------------------------------------------------------
# General API
#-----------------------------------------------------------------------------
[docs]
@abstract
class MapOptions(Model):
''' Abstract base class for map options' models.
'''
# explicit __init__ to support Init signatures
def __init__(self, *args, **kwargs) -> None:
super().__init__(*args, **kwargs)
lat = Required(Float, help="""
The latitude where the map should be centered.
""")
lng = Required(Float, help="""
The longitude where the map should be centered.
""")
zoom = Int(12, help="""
The initial zoom level to use when displaying the map.
""")
[docs]
@abstract
class MapPlot(Plot):
''' Abstract base class for map plot models.
'''
def __init__(self, *args, **kwargs) -> None:
from ..models.ranges import Range1d
for r in ('x_range', 'y_range'):
if r in kwargs and not isinstance(kwargs.get(r), Range1d):
raise ValueError(f"Invalid value for {r!r}, MapPlot ranges may only be Range1d, not data ranges")
super().__init__(*args, **kwargs)
@error(INCOMPATIBLE_MAP_RANGE_TYPE)
def _check_incompatible_map_range_type(self):
from ..models.ranges import Range1d
if self.x_range is not None and not isinstance(self.x_range, Range1d):
return f"{self!s}.x_range"
if self.y_range is not None and not isinstance(self.y_range, Range1d):
return f"{self!s}.y_range"
[docs]
class GMapOptions(MapOptions):
''' Options for ``GMapPlot`` objects.
'''
# explicit __init__ to support Init signatures
def __init__(self, *args, **kwargs) -> None:
super().__init__(*args, **kwargs)
map_type = Enum(MapType, default="roadmap", help="""
The `map type`_ to use for the ``GMapPlot``.
.. _map type: https://developers.google.com/maps/documentation/javascript/reference#MapTypeId
""")
scale_control = Bool(default=False, help="""
Whether the Google map should display its distance scale control.
""")
styles = Nullable(JSON, default=None, help="""
A JSON array of `map styles`_ to use for the ``GMapPlot``. Many example styles can
`be found here`_.
.. _map styles: https://developers.google.com/maps/documentation/javascript/reference#MapTypeStyle
.. _be found here: https://snazzymaps.com
""")
tilt = Int(default=45, help="""
`Tilt`_ angle of the map. The only allowed values are 0 and 45.
Only has an effect on 'satellite' and 'hybrid' map types.
A value of 0 causes the map to always use a 0 degree overhead view.
A value of 45 causes the tilt angle to switch to 45 imagery if available.
.. _Tilt: https://developers.google.com/maps/documentation/javascript/reference/3/map#MapOptions.tilt
""")
[docs]
class GMapPlot(MapPlot):
''' A Bokeh Plot with a `Google Map`_ displayed underneath.
Data placed on this plot should be specified in decimal lat/lon coordinates
e.g. ``(37.123, -122.404)``. It will be automatically converted into the
web mercator projection to display properly over google maps tiles.
The ``api_key`` property must be configured with a Google API Key in order
for ``GMapPlot`` to function. The key will be stored in the Bokeh Document
JSON.
Note that Google Maps exert explicit control over aspect ratios at all
times, which imposes some limitations on ``GMapPlot``:
* Only ``Range1d`` ranges are supported. Attempting to use other range
types will result in an error.
* Usage of ``BoxZoomTool`` is incompatible with ``GMapPlot``. Adding a
``BoxZoomTool`` will have no effect.
.. _Google Map: https://www.google.com/maps/
'''
# explicit __init__ to support Init signatures
def __init__(self, *args, **kwargs) -> None:
super().__init__(*args, **kwargs)
# TODO (bev) map plot might not have these
@error(REQUIRED_RANGE)
def _check_required_range(self):
pass
@warning(MISSING_RENDERERS)
def _check_missing_renderers(self):
pass
@error(MISSING_GOOGLE_API_KEY)
def _check_missing_google_api_key(self):
if self.api_key is None:
return str(self)
map_options = Instance(GMapOptions, help="""
Options for displaying the plot.
""")
border_fill_color = Override(default="#ffffff")
background_fill_alpha = Override(default=0.0)
api_key = Required(Bytes, help="""
Google Maps API requires an API key. See https://developers.google.com/maps/documentation/javascript/get-api-key
for more information on how to obtain your own.
""").accepts(String, lambda val: val.encode("utf-8"))
api_version = String(default="weekly", help="""
The version of Google Maps API to use. See https://developers.google.com/maps/documentation/javascript/versions
for more information.
.. note::
Changing this value may result in broken map rendering.
""")
x_range = Override(default=InstanceDefault(Range1d))
y_range = Override(default=InstanceDefault(Range1d))
#-----------------------------------------------------------------------------
# Dev API
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Private API
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
