#-----------------------------------------------------------------------------
# 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 describing different kinds of ranges of values
in different kinds of spaces (e.g., continuous or categorical)
and with options for "auto sizing".
'''
#-----------------------------------------------------------------------------
# Boilerplate
#-----------------------------------------------------------------------------
from __future__ import annotations
import logging # isort:skip
log = logging.getLogger(__name__)
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# Standard library imports
from collections import Counter
from math import nan
# Bokeh imports
from ..core.enums import PaddingUnits, StartEnd
from ..core.has_props import abstract
from ..core.properties import (
Auto,
Bool,
Datetime,
Either,
Enum,
FactorSeq,
Float,
Instance,
List,
MinMaxBounds,
Null,
Nullable,
Override,
Readonly,
Required,
TimeDelta,
)
from ..core.validation import error
from ..core.validation.errors import DUPLICATE_FACTORS
from ..model import Model
#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------
__all__ = (
'DataRange',
'DataRange1d',
'FactorRange',
'Range',
'Range1d',
)
#-----------------------------------------------------------------------------
# General API
#-----------------------------------------------------------------------------
[docs]
@abstract
class Range(Model):
''' A base class for all range types.
'''
# explicit __init__ to support Init signatures
def __init__(self, *args, **kwargs) -> None:
super().__init__(*args, **kwargs)
@abstract
class NumericalRange(Range):
''' A base class for numerical ranges.
'''
# explicit __init__ to support Init signatures
def __init__(self, *args, **kwargs) -> None:
super().__init__(*args, **kwargs)
start = Required(Either(Float, Datetime, TimeDelta), help="""
The start of the range.
""")
end = Required(Either(Float, Datetime, TimeDelta), help="""
The end of the range.
""")
[docs]
class Range1d(NumericalRange):
''' A fixed, closed range [start, end] in a continuous scalar
dimension.
In addition to supplying ``start`` and ``end`` keyword arguments
to the ``Range1d`` initializer, you can also instantiate with
the convenience syntax::
Range(0, 10) # equivalent to Range(start=0, end=10)
'''
def __init__(self, *args, **kwargs) -> None:
if args and ('start' in kwargs or 'end' in kwargs):
raise ValueError("'start' and 'end' keywords cannot be used with positional arguments")
if args and len(args) != 2:
raise ValueError('Only Range1d(start, end) acceptable when using positional arguments')
if args:
kwargs['start'] = args[0]
kwargs['end'] = args[1]
super().__init__(**kwargs)
reset_start = Either(Null, Float, Datetime, TimeDelta, help="""
The start of the range to apply after reset. If set to ``None`` defaults
to the ``start`` value during initialization.
""")
reset_end = Either(Null, Float, Datetime, TimeDelta, help="""
The end of the range to apply when resetting. If set to ``None`` defaults
to the ``end`` value during initialization.
""")
bounds = Nullable(MinMaxBounds(accept_datetime=True), help="""
The bounds that the range is allowed to go to. Typically used to prevent
the user from panning/zooming/etc away from the data.
If set to ``'auto'``, the bounds will be computed to the start and end of the Range.
Bounds are provided as a tuple of ``(min, max)`` so regardless of whether your range is
increasing or decreasing, the first item should be the minimum value of the range and the
second item should be the maximum. Setting min > max will result in a ``ValueError``.
By default, bounds are ``None`` and your plot to pan/zoom as far as you want. If you only
want to constrain one end of the plot, you can set min or max to None.
Examples:
.. code-block:: python
Range1d(0, 1, bounds='auto') # Auto-bounded to 0 and 1 (Default behavior)
Range1d(start=0, end=1, bounds=(0, None)) # Maximum is unbounded, minimum bounded to 0
""")
min_interval = Either(Null, Float, TimeDelta, help="""
The level that the range is allowed to zoom in, expressed as the
minimum visible interval. If set to ``None`` (default), the minimum
interval is not bound. Can be a ``TimeDelta``. """)
max_interval = Either(Null, Float, TimeDelta, help="""
The level that the range is allowed to zoom out, expressed as the
maximum visible interval. Can be a ``TimeDelta``. Note that ``bounds`` can
impose an implicit constraint on the maximum interval as well. """)
start = Override(default=0)
end = Override(default=1)
[docs]
@abstract
class DataRange(NumericalRange):
''' A base class for all data range types.
'''
# explicit __init__ to support Init signatures
def __init__(self, *args, **kwargs) -> None:
super().__init__(*args, **kwargs)
renderers = Either(List(Instance(Model)), Auto, help="""
An explicit list of renderers to autorange against. If unset,
defaults to all renderers on a plot.
""")
start = Override(default=nan)
end = Override(default=nan)
[docs]
class DataRange1d(DataRange):
''' An auto-fitting range in a continuous scalar dimension.
By default the ``start`` and ``end`` of the range automatically
assume min and max values of the data for associated renderers.
'''
def __init__(self, *args, **kwargs) -> None:
if kwargs.get('follow') is not None:
kwargs['bounds'] = None
super().__init__(*args, **kwargs)
range_padding = Either(Float, TimeDelta, default=0.1, help="""
How much padding to add around the computed data bounds.
When ``range_padding_units`` is set to ``"percent"``, the span of the
range span is expanded to make the range ``range_padding`` percent larger.
When ``range_padding_units`` is set to ``"absolute"``, the start and end
of the range span are extended by the amount ``range_padding``.
""")
range_padding_units = Enum(PaddingUnits, default="percent", help="""
Whether the ``range_padding`` should be interpreted as a percentage, or
as an absolute quantity. (default: ``"percent"``)
""")
bounds = Nullable(MinMaxBounds(accept_datetime=True), help="""
The bounds that the range is allowed to go to. Typically used to prevent
the user from panning/zooming/etc away from the data.
By default, the bounds will be None, allowing your plot to pan/zoom as far
as you want. If bounds are 'auto' they will be computed to be the same as
the start and end of the ``DataRange1d``.
Bounds are provided as a tuple of ``(min, max)`` so regardless of whether
your range is increasing or decreasing, the first item should be the
minimum value of the range and the second item should be the maximum.
Setting ``min > max`` will result in a ``ValueError``.
If you only want to constrain one end of the plot, you can set ``min`` or
``max`` to ``None`` e.g. ``DataRange1d(bounds=(None, 12))``
""")
min_interval = Either(Null, Float, TimeDelta, help="""
The level that the range is allowed to zoom in, expressed as the
minimum visible interval. If set to ``None`` (default), the minimum
interval is not bound.""")
max_interval = Either(Null, Float, TimeDelta, help="""
The level that the range is allowed to zoom out, expressed as the
maximum visible interval. Note that ``bounds`` can impose an
implicit constraint on the maximum interval as well.""")
flipped = Bool(default=False, help="""
Whether the range should be "flipped" from its normal direction when
auto-ranging.
""")
follow = Nullable(Enum(StartEnd), help="""
Configure the data to follow one or the other data extreme, with a
maximum range size of ``follow_interval``.
If set to ``"start"`` then the range will adjust so that ``start`` always
corresponds to the minimum data value (or maximum, if ``flipped`` is
``True``).
If set to ``"end"`` then the range will adjust so that ``end`` always
corresponds to the maximum data value (or minimum, if ``flipped`` is
``True``).
If set to ``None`` (default), then auto-ranging does not follow, and
the range will encompass both the minimum and maximum data values.
``follow`` cannot be used with bounds, and if set, bounds will be set to
``None``.
""")
follow_interval = Nullable(Either(Float, TimeDelta), help="""
If ``follow`` is set to ``"start"`` or ``"end"`` then the range will
always be constrained to that::
abs(r.start - r.end) <= follow_interval
is maintained.
""")
default_span = Either(Float, TimeDelta, default=2.0, help="""
A default width for the interval, in case ``start`` is equal to ``end``
(if used with a log axis, default_span is in powers of 10).
""")
only_visible = Bool(default=False, help="""
If True, renderers that that are not visible will be excluded from automatic
bounds computations.
""")
[docs]
class FactorRange(Range):
''' A Range of values for a categorical dimension.
In addition to supplying ``factors`` as a keyword argument to the
``FactorRange`` initializer, you may also instantiate with a sequence of
positional arguments:
.. code-block:: python
FactorRange("foo", "bar") # equivalent to FactorRange(factors=["foo", "bar"])
Users will normally supply categorical values directly:
.. code-block:: python
p.circle(x=["foo", "bar"], ...)
BokehJS will create a mapping from ``"foo"`` and ``"bar"`` to a numerical
coordinate system called *synthetic coordinates*. In the simplest cases,
factors are separated by a distance of 1.0 in synthetic coordinates,
however the exact mapping from factors to synthetic coordinates is
affected by the padding properties as well as whether the number of levels
the factors have.
Users typically do not need to worry about the details of this mapping,
however it can be useful to fine tune positions by adding offsets. When
supplying factors as coordinates or values, it is possible to add an
offset in the synthetic coordinate space by adding a final number value
to a factor tuple. For example:
.. code-block:: python
p.circle(x=[("foo", 0.3), ...], ...)
will position the first circle at an ``x`` position that is offset by
adding 0.3 to the synthetic coordinate for ``"foo"``.
'''
factors = FactorSeq(default=[], help="""
A sequence of factors to define this categorical range.
Factors may have 1, 2, or 3 levels. For 1-level factors, each factor is
simply a string. For example:
.. code-block:: python
FactorRange(factors=["sales", "marketing", "engineering"])
defines a range with three simple factors that might represent different
units of a business.
For 2- and 3- level factors, each factor is a tuple of strings:
.. code-block:: python
FactorRange(factors=[
["2016", "sales"], ["2016", "marketing"], ["2016", "engineering"],
["2017", "sales"], ["2017", "marketing"], ["2017", "engineering"],
])
defines a range with six 2-level factors that might represent the three
business units, grouped by year.
Note that factors and sub-factors *may only be strings*.
""")
factor_padding = Float(default=0.0, help="""
How much padding to add in between all lowest-level factors. When
``factor_padding`` is non-zero, every factor in every group will have the
padding value applied.
""")
subgroup_padding = Float(default=0.8, help="""
How much padding to add in between mid-level groups of factors. This
property only applies when the overall factors have three levels. For
example with:
.. code-block:: python
FactorRange(factors=[
['foo', 'A', '1'], ['foo', 'A', '2'], ['foo', 'A', '3'],
['foo', 'B', '2'],
['bar', 'A', '1'], ['bar', 'A', '2']
])
This property dictates how much padding to add between the three factors
in the `['foo', 'A']` group, and between the two factors in the
[`bar`]
""")
group_padding = Float(default=1.4, help="""
How much padding to add in between top-level groups of factors. This
property only applies when the overall range factors have either two or
three levels. For example, with:
.. code-block:: python
FactorRange(factors=[["foo", "1"], ["foo", "2"], ["bar", "1"]])
The top level groups correspond to ``"foo"`` and ``"bar"``, and the
group padding will be applied between the factors ``["foo", "2"]`` and
``["bar", "1"]``
""")
range_padding = Float(default=0, help="""
How much padding to add around the outside of computed range bounds.
When ``range_padding_units`` is set to ``"percent"``, the span of the
range span is expanded to make the range ``range_padding`` percent larger.
When ``range_padding_units`` is set to ``"absolute"``, the start and end
of the range span are extended by the amount ``range_padding``.
""")
range_padding_units = Enum(PaddingUnits, default="percent", help="""
Whether the ``range_padding`` should be interpreted as a percentage, or
as an absolute quantity. (default: ``"percent"``)
""")
start = Readonly(Float, default=0, help="""
The start of the range, in synthetic coordinates.
.. note::
Synthetic coordinates are only computed in the browser, based on the
factors and various padding properties. The value of ``start`` will only
be available in situations where bidirectional communication is
available (e.g. server, notebook).
""")
end = Readonly(Float, default=0, help="""
The end of the range, in synthetic coordinates.
.. note::
Synthetic coordinates are only computed in the browser, based on the
factors and various padding properties. The value of ``end`` will only
be available in situations where bidirectional communication is
available (e.g. server, notebook).
""")
bounds = Nullable(MinMaxBounds(accept_datetime=False), help="""
The bounds (in synthetic coordinates) that the range is allowed to go to.
Typically used to prevent the user from panning/zooming/etc away from the
data.
.. note::
Synthetic coordinates are only computed in the browser, based on the
factors and various padding properties. Some experimentation may be
required to arrive at bounds suitable for specific situations.
By default, the bounds will be None, allowing your plot to pan/zoom as far
as you want. If bounds are 'auto' they will be computed to be the same as
the start and end of the ``FactorRange``.
""")
min_interval = Nullable(Float, help="""
The level that the range is allowed to zoom in, expressed as the
minimum visible interval in synthetic coordinates. If set to ``None``
(default), the minimum interval is not bounded.
The default "width" of a category is 1.0 in synthetic coordinates.
However, the distance between factors is affected by the various
padding properties and whether or not factors are grouped.
""")
max_interval = Nullable(Float, help="""
The level that the range is allowed to zoom out, expressed as the
maximum visible interval in synthetic coordinates.. Note that ``bounds``
can impose an implicit constraint on the maximum interval as well.
The default "width" of a category is 1.0 in synthetic coordinates.
However, the distance between factors is affected by the various
padding properties and whether or not factors are grouped.
""")
def __init__(self, *args, **kwargs) -> None:
if args and "factors" in kwargs:
raise ValueError("'factors' keyword cannot be used with positional arguments")
elif args:
kwargs['factors'] = list(args)
super().__init__(**kwargs)
@error(DUPLICATE_FACTORS)
def _check_duplicate_factors(self):
dupes = [item for item, count in Counter(self.factors).items() if count > 1]
if dupes:
return f"duplicate factors found: {', '.join(repr(x) for x in dupes)}"
#-----------------------------------------------------------------------------
# Dev API
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Private API
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
