altair.PositionValueDef

class altair.PositionValueDef(value=Undefined, **kwds)

PositionValueDef schema wrapper.

Definition object for a constant value (primitive value or gradient definition) of an encoding channel.

Parameters:

valuedict, float, ExprRef, Literal[‘height’, ‘width’]

A constant value in visual domain (e.g., "red" / "#0099ff" / gradient definition for color, values between 0 to 1 for opacity).

__init__(value=Undefined, **kwds)

Methods

__init__([value])
copy([deep, ignore])	Return a copy of the object.
from_dict(dct[, validate])	Construct class from a dictionary representation.
from_json(json_string[, validate])	Instantiate the object from a valid JSON string.
resolve_references([schema])	Resolve references in the context of this object's schema or root schema.
to_dict([validate, ignore, context])	Return a dictionary representation of the object.
to_json([validate, indent, sort_keys, ...])	Emit the JSON representation for this object as a string.
validate(instance[, schema])	Validate the instance against the class schema in the context of the rootschema.
validate_property(name, value[, schema])	Validate a property against property schema in the context of the rootschema.