#-----------------------------------------------------------------------------
# Copyright (c) 2012 - 2019, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
''' Provide the numeric properties.
'''
#-----------------------------------------------------------------------------
# Boilerplate
#-----------------------------------------------------------------------------
from __future__ import absolute_import, division, print_function, unicode_literals
import logging
log = logging.getLogger(__name__)
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# Imports
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# Standard library imports
# External imports
# Bokeh imports
from .bases import ParameterizedProperty
from .primitive import Int, Float
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# Globals and constants
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__all__ = (
'Angle',
'Byte',
'Interval',
'Percent',
'Size',
)
#-----------------------------------------------------------------------------
# General API
#-----------------------------------------------------------------------------
[docs]class Interval(ParameterizedProperty):
''' Accept numeric values that are contained within a given interval.
Args:
interval_type (numeric property):
numeric types for the range, e.g. ``Int``, ``Float``
start (number) :
A minimum allowable value for the range. Values less than
``start`` will result in validation errors.
end (number) :
A maximum allowable value for the range. Values greater than
``end`` will result in validation errors.
Example:
.. code-block:: python
>>> class RangeModel(HasProps):
... prop = Range(Float, 10, 20)
...
>>> m = RangeModel()
>>> m.prop = 10
>>> m.prop = 20
>>> m.prop = 15
>>> m.prop = 2 # ValueError !!
>>> m.prop = 22 # ValueError !!
>>> m.prop = "foo" # ValueError !!
'''
def __init__(self, interval_type, start, end, default=None, help=None):
self.interval_type = self._validate_type_param(interval_type)
# Make up a property name for validation purposes
self.interval_type.validate(start)
self.interval_type.validate(end)
self.start = start
self.end = end
super(Interval, self).__init__(default=default, help=help)
def __str__(self):
return "%s(%s, %r, %r)" % (self.__class__.__name__, self.interval_type, self.start, self.end)
@property
def type_params(self):
return [self.interval_type]
def validate(self, value, detail=True):
super(Interval, self).validate(value, detail)
if not (value is None or self.interval_type.is_valid(value) and value >= self.start and value <= self.end):
msg = "" if not detail else "expected a value of type %s in range [%s, %s], got %r" % (self.interval_type, self.start, self.end, value)
raise ValueError(msg)
[docs]class Byte(Interval):
''' Accept integral byte values (0-255).
Example:
.. code-block:: python
>>> class ByteModel(HasProps):
... prop = Byte(default=0)
...
>>> m = ByteModel()
>>> m.prop = 255
>>> m.prop = 256 # ValueError !!
>>> m.prop = 10.3 # ValueError !!
'''
def __init__(self, default=0, help=None):
super(Byte, self).__init__(Int, 0, 255, default=default, help=help)
[docs]class Size(Float):
''' Accept non-negative numeric values.
Args:
default (float or None, optional) :
A default value for attributes created from this property to
have (default: None)
help (str or None, optional) :
A documentation string for this property. It will be automatically
used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
generating Spinx documentation. (default: None)
serialized (bool, optional) :
Whether attributes created from this property should be included
in serialization (default: True)
readonly (bool, optional) :
Whether attributes created from this property are read-only.
(default: False)
Example:
.. code-block:: python
>>> class SizeModel(HasProps):
... prop = Size()
...
>>> m = SizeModel()
>>> m.prop = 0
>>> m.prop = 10e6
>>> m.prop = -10 # ValueError !!
>>> m.prop = "foo" # ValueError !!
'''
def validate(self, value, detail=True):
super(Size, self).validate(value, detail)
if not (value is None or 0.0 <= value):
msg = "" if not detail else "expected a non-negative number, got %r" % value
raise ValueError(msg)
[docs]class Percent(Float):
''' Accept floating point percentage values.
``Percent`` can be useful and semantically meaningful for specifying
things like alpha values and extents.
Args:
default (float or None, optional) :
A default value for attributes created from this property to
have (default: None)
help (str or None, optional) :
A documentation string for this property. It will be automatically
used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
generating Spinx documentation. (default: None)
serialized (bool, optional) :
Whether attributes created from this property should be included
in serialization (default: True)
readonly (bool, optional) :
Whether attributes created from this property are read-only.
(default: False)
Example:
.. code-block:: python
>>> class PercentModel(HasProps):
... prop = Percent()
...
>>> m = PercentModel()
>>> m.prop = 0.0
>>> m.prop = 0.2
>>> m.prop = 1.0
>>> m.prop = -2 # ValueError !!
>>> m.prop = 5 # ValueError !!
'''
def validate(self, value, detail=True):
super(Percent, self).validate(value, detail)
if not (value is None or 0.0 <= value <= 1.0):
msg = "" if not detail else "expected a value in range [0, 1], got %r" % value
raise ValueError(msg)
[docs]class Angle(Float):
''' Accept floating point angle values.
``Angle`` is equivalent to :class:`~bokeh.core.properties.Float` but is
provided for cases when it is more semantically meaningful.
Args:
default (float or None, optional) :
A default value for attributes created from this property to
have (default: None)
help (str or None, optional) :
A documentation string for this property. It will be automatically
used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
generating Spinx documentation. (default: None)
serialized (bool, optional) :
Whether attributes created from this property should be included
in serialization (default: True)
readonly (bool, optional) :
Whether attributes created from this property are read-only.
(default: False)
'''
pass
#-----------------------------------------------------------------------------
# Dev API
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#-----------------------------------------------------------------------------
# Private API
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
