twisted.positioning.base.PositionError : API documentation

Instance Variable	pdop	The position dilution of precision. `None` if unknown. (type: `float` or `NoneType`)
Instance Variable	hdop	The horizontal dilution of precision. `None` if unknown. (type: `float` or `NoneType`)
Instance Variable	vdop	The vertical dilution of precision. `None` if unknown. (type: `float` or `NoneType`)
Method	__init__	Initializes a positioning error object.
Method	__repr__	Returns a string representation of positioning information object.
Class Variable	_ALLOWABLE_THRESHOLD	The maximum allowable difference between PDOP and the geometric mean of VDOP and HDOP. That difference is supposed to be zero, but can be non-zero because of rounding error and limited reporting precision. You should never have to change this value. (type: `float`)
Class Variable	_DOP_EXPRESSIONS	A mapping of DOP types (C[hvp]dop) to a list of callables that take self and return that DOP type, or raise `TypeError`. This allows a DOP value to either be returned directly if it's know, or computed from other DOP types if it isn't. (type: `dict` of `str` to callables)
Method	_testDilutionOfPositionInvariant	Tests if this positioning error object satisfies the dilution of position invariant (PDOP = (HDOP2 + VDOP2)*.5), unless the `self._testInvariant` instance variable is `False`.
Method	_getDOP	Gets a particular dilution of position value.
Method	_setDOP	Sets a particular dilution of position value.

Inherited from FancyEqMixin:

Method	__eq__	Undocumented
Method	__ne__	Undocumented

def __init__(self, pdop=None, hdop=None, vdop=None, testInvariant=False): (source)

Initializes a positioning error object.

Parameters	pdop	The position dilution of precision. `None` if unknown. (type: `float` or `NoneType`)
	hdop	The horizontal dilution of precision. `None` if unknown. (type: `float` or `NoneType`)
	vdop	The vertical dilution of precision. `None` if unknown. (type: `float` or `NoneType`)
	testInvariant	Flag to test if the DOP invariant is valid or not. If `True`, the invariant (PDOP = (HDOP2 + VDOP2)*.5) is checked at every mutation. By default, this is false, because the vast majority of DOP-providing devices ignore this invariant. (type: c{bool})

def _testDilutionOfPositionInvariant(self): (source)

Tests if this positioning error object satisfies the dilution of position invariant (PDOP = (HDOP**2 + VDOP**2)*.5), unless the self._testInvariant instance variable is False.

Returns	`None` if the invariant was not satisfied or not tested.
Raises	ValueError	Raised if the invariant was tested but not satisfied.

def _getDOP(self, dopType): (source)

Gets a particular dilution of position value.

Parameters	dopType	The type of dilution of position to get. One of ('pdop', 'hdop', 'vdop'). (type: `str`)
Returns	The DOP if it is known, `None` otherwise. (type: `float` or `NoneType`)

def _setDOP(self, dopType, value): (source)

Sets a particular dilution of position value.

Parameters	dopType	The type of dilution of position to set. One of ('pdop', 'hdop', 'vdop'). (type: `str`)
	value	The value to set the dilution of position type to. (type: `float` If this position error tests dilution of precision invariants, it will be checked. If the invariant is not satisfied, the assignment will be undone and `ValueError` is raised. )

t.p.b.PositionError(object, FancyEqMixin) : class documentation