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Generic positioning base classes.
@since: 14.0
� )�partial)�
attrgetter)�ClassVar�Sequence)� implementer)�
NamedConstant�Names)� ipositioning)� FancyEqMixing��2Tv�?gr �q ��?g����ׁ�?c �H � e Zd ZdZ e� Z e� Z e� Z e� Zy)�Anglesa�
The types of angles.
@cvar LATITUDE: Angle representing a latitude of an object.
@type LATITUDE: L{NamedConstant}
@cvar LONGITUDE: Angle representing the longitude of an object.
@type LONGITUDE: L{NamedConstant}
@cvar HEADING: Angle representing the heading of an object.
@type HEADING: L{NamedConstant}
@cvar VARIATION: Angle representing a magnetic variation.
@type VARIATION: L{NamedConstant}
N) �__name__�
__module__� __qualname__�__doc__r �LATITUDE� LONGITUDE�HEADING� VARIATION� � �:/usr/lib/python3/dist-packages/twisted/positioning/base.pyr
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s% � ��" ��H� ��I��o�G� ��Ir r
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DirectionszB
The four cardinal directions (north, east, south, west).
N) r r r r r �NORTH�EAST�SOUTH�WESTr r r r r 3 s% � ��
�O�E� �?�D� �O�E� �?�Dr r c �@ � e Zd ZdZd� Zd� Zd� Zd� Zd� Zd� Z d� Z
d � Z y
) �BasePositioningReceiveraS
A base positioning receiver.
This class would be a good base class for building positioning
receivers. It implements the interface (so you don't have to) with stub
methods.
People who want to implement positioning receivers should subclass this
class and override the specific callbacks they want to handle.
c � � y)zG
Implements L{IPositioningReceiver.timeReceived} stub.
Nr )�self�times r � timeReceivedz$BasePositioningReceiver.timeReceivedK � � r c � � y)zJ
Implements L{IPositioningReceiver.headingReceived} stub.
Nr )r" �headings r �headingReceivedz'BasePositioningReceiver.headingReceivedP r% r c � � y)zH
Implements L{IPositioningReceiver.speedReceived} stub.
Nr �r" �speeds r �
speedReceivedz%BasePositioningReceiver.speedReceivedU r% r c � � y)zH
Implements L{IPositioningReceiver.climbReceived} stub.
Nr �r" �climbs r �
climbReceivedz%BasePositioningReceiver.climbReceivedZ r% r c � � y)zK
Implements L{IPositioningReceiver.positionReceived} stub.
Nr )r" �latitude� longitudes r �positionReceivedz(BasePositioningReceiver.positionReceived_ r% r c � � y)zP
Implements L{IPositioningReceiver.positionErrorReceived} stub.
Nr )r" �
positionErrors r �positionErrorReceivedz-BasePositioningReceiver.positionErrorReceivedd r% r c � � y)zK
Implements L{IPositioningReceiver.altitudeReceived} stub.
Nr �r" �altitudes r �altitudeReceivedz(BasePositioningReceiver.altitudeReceivedi r% r c � � y)zT
Implements L{IPositioningReceiver.beaconInformationReceived} stub.
Nr )r" �beaconInformations r �beaconInformationReceivedz1BasePositioningReceiver.beaconInformationReceivedn r% r N) r r r r r$ r( r, r0 r4 r7 r; r> r r r r r > s/ � � � �
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r r c � � e Zd ZdZy)�InvalidSentencez9
An exception raised when a sentence is invalid.
N�r r r r r r r r@ r@ t � � �r r@ c � � e Zd ZdZy)�InvalidChecksumzI
An exception raised when the checksum of a sentence is invalid.
NrA r r r rD rD z rB r rD c �\ � e Zd ZU dZej
d� ej d� ej d� ej d� iZ ej
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An object representing an angle.
@cvar _RANGE_EXPRESSIONS: A collection of expressions for the allowable
range for the angular value of a particular coordinate value.
@type _RANGE_EXPRESSIONS: C{dict} of L{Angles} constants to callables
@cvar _ANGLE_TYPE_NAMES: English names for angle types.
@type _ANGLE_TYPE_NAMES: C{dict} of L{Angles} constants to C{str}
c �" � d| cxk xr dk S c S )Ng �V�g �V@r )r2 s r �<lambda>zAngle.<lambda>� s � �%�(�*A�T�*A� �*A� r c �" � d| cxk xr dk S c S )Ng �f�g �f@r )r3 s r rH zAngle.<lambda>� s � �F�Y�,F��,F� �,F� r c �" � d| cxk xr dk S c S )Nr �h r )r' s r rH zAngle.<lambda>� s � ��W�(:�s�(:� �(:� r c �" � d| cxk xr dk S c S )NiL���� r )� variations r rH zAngle.<lambda>� s � �D�9�,C��,C� �,C� r �Latitude� Longitude� Variation�Heading)� angleType�inDecimalDegrees�compareAttributesNc �� � |�|| j vr t d� �|�6|�4| j | } ||� s d}t |j ||� � �|| _ || _ y)aG
Initializes an angle.
@param angle: The value of the angle in decimal degrees. (L{None} if
unknown).
@type angle: C{float} or L{None}
@param angleType: A symbolic constant describing the angle type. Should
be one of L{Angles} or {None} if unknown.
@raises ValueError: If the angle type is not the default argument,
but it is an unknown type (not in C{Angle._RANGE_EXPRESSIONS}),
or it is a known type but the supplied value was out of the
allowable range for said type.
NzUnknown angle typez+Angle {0} not in allowed range for type {1})�_RANGE_EXPRESSIONS�
ValueError�formatrS �_angle)r" �anglerS �rangeExpression�templates r �__init__zAngle.__init__� so � � � �Y�d�6M�6M�%M� � 1�2� 2� � ��!6� "� 5� 5�i� @�O�"�5�)�H�� �� � �� �!B�C�C�"����� r c � � | j S )z�
The value of this angle in decimal degrees. This value is immutable.
@return: This angle expressed in decimal degrees, or L{None} if the
angle is unknown.
@rtype: C{float} (or L{None})
�rZ �r" s r rT zAngle.inDecimalDegrees� � � � �{�{�r c � � | j �yt t | j � � }t | j t | j � z
� }d|z }t |� }|t |� z
}d|z }||t |� fS )a
The value of this angle as a degrees, minutes, seconds tuple. This
value is immutable.
@return: This angle expressed in degrees, minutes, seconds. L{None} if
the angle is unknown.
@rtype: 3-C{tuple} of C{int} (or L{None})
N�< )rZ �abs�int)r" �degrees�fractionalDegrees�decimalMinutes�minutes�fractionalMinutes�decimalSecondss r �inDegreesMinutesSecondsz Angle.inDegreesMinutesSeconds� s� � � �;�;� ���c�$�+�+�&�'�� �� � �c�$�+�+�.>� >� ?��� /�/���n�%�� *�S� �-@� @��� /�/�����^�!4�4�4r c �b � |dvrt d|z � �|t | j � z | _ y)a
Sets the sign of this angle.
@param sign: The new sign. C{1} for positive and C{-1} for negative
signs, respectively.
@type sign: C{int}
@raise ValueError: If the C{sign} parameter is not C{-1} or C{1}.
)���� z#bad sign (got %s, expected -1 or 1)N)rX re rZ �r" �signs r �setSignz
Angle.setSign� s2 � � �w� � � B�T� I�J� J��S���� -�-�� r c � � | j S )z�
Returns this angle as a float.
@return: The float value of this angle, expressed in degrees.
@rtype: C{float}
r` ra s r � __float__zAngle.__float__� s � � �{�{�r �returnc �& � dj | �� S )��
Returns a string representation of this angle.
@return: The string representation.
@rtype: C{str}
z.<{s._angleTypeNameRepr} ({s._angleValueRepr})>��s�rY ra s r �__repr__zAngle.__repr__� s � � @�F�F��F�N�Nr c �N � | j �dt | j d� z S y)z�
Returns a string representation of the angular value of this angle.
This is a helper function for the actual C{__repr__}.
@return: The string representation.
@rtype: C{str}
z
%s degrees� z
unknown value)rT �roundra s r �_angleValueReprzAngle._angleValueRepr� s+ � � � � � ,� �%��(=�(=�q�"A�A� A�"r c �T � | j | j S # t $ r Y yw xY w)z�
Returns a string representation of the type of this angle.
This is a helper function for the actual C{__repr__}.
@return: The string representation.
@rtype: C{str}
zAngle of unknown type)�_ANGLE_TYPE_NAMESrS �KeyErrorra s r �_angleTypeNameReprzAngle._angleTypeNameRepr s. � � +��)�)�$�.�.�9� 9��� +�*� +�s � � '�'�NN)r r r r r
r r r r rW r� rU r r �str�__annotations__r^ �propertyrT rm rs ru r| r� r� r r r rF rF � s� � �� ���A����F����:����C� �� �������+����+���� � ��2��x���
�.� �
�8 �� �� �5� �5�,
.� �O�#� O� � #� � #� � +� � +r rF c �x � e Zd ZdZd
d�Zed
d�� Zed� � Zd� Z e
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The heading of a mobile object.
@ivar variation: The (optional) magnetic variation.
The sign of the variation is positive for variations towards the east
(clockwise from north), and negative for variations towards the west
(counterclockwise from north).
If the variation is unknown or not applicable, this is L{None}.
@type variation: C{Angle} or L{None}.
@ivar correctedHeading: The heading, corrected for variation. If the
variation is unknown (L{None}), is None. This attribute is read-only
(its value is determined by the angle and variation attributes). The
value is coerced to being between 0 (inclusive) and 360 (exclusive).
Nc �\ � t j | |t j � || _ y)zB
Initializes an angle with an optional variation.
N)rF r^ r
r rN )r" r[ rN s r r^ zHeading.__init__, s � � ���t�U�F�N�N�3�"��r c �H � t |t j � } | ||� S )a_
Constructs a Heading from the float values of the angle and variation.
@param angleValue: The angle value of this heading.
@type angleValue: C{float}
@param variationValue: The value of the variation of this heading.
@type variationValue: C{float}
@return: A L{Heading} with the given values.
)rF r
r )�cls�
angleValue�variationValuerN s r �
fromFloatszHeading.fromFloats3 s# � � �.�&�*:�*:�;� ��:�y�)�)r c � � | j � | j �y| j | j j z
dz }t |t j
� S )a
Corrects the heading by the given variation. This is sometimes known as
the true heading.
@return: The heading, corrected by the variation. If the variation or
the angle are unknown, returns L{None}.
@rtype: C{float} or L{None}
NrK )rZ rN rT rF r
r )r" r[ s r �correctedHeadingzHeading.correctedHeadingA sJ � � �;�;� �$�.�.�"8���&�&�� � �)H�)H�H�C�O���U�F�N�N�+�+r c �| � | j j � t d� �| j j |� y)a
Sets the sign of the variation of this heading.
@param sign: The new sign. C{1} for positive and C{-1} for negative
signs, respectively.
@type sign: C{int}
@raise ValueError: If the C{sign} parameter is not C{-1} or C{1}.
Nz*can't set the sign of an unknown variation)rN rT rX rs rq s r rs zHeading.setSignQ s2 � � �>�>� *� *� 2� � I�J� J� ��� � �t�$r rN rv c � � | j �d}nt | j � }dj | j | j |� S )rx zunknown variationz
<{} ({}, {})>)rN �reprrY r� r� )r" �
variationReprs r r| zHeading.__repr__b sI � � �>�>� !� /�M� �� � � 0�M� �%�%� � #� #� � � � �
�
r r� )r r r r r^ � classmethodr� r� r� rs �listrF rU r� r| r r r rR rR s_ � �
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r rR c �( � e Zd ZdZdd�Zed� � Zy)�
Coordinatea
A coordinate.
@ivar angle: The value of the coordinate in decimal degrees, with the usual
rules for sign (northern and eastern hemispheres are positive, southern
and western hemispheres are negative).
@type angle: C{float}
Nc � � |t j t j dfvrt dj |� � �t
j
| ||� y)aM
Initializes a coordinate.
@param angle: The angle of this coordinate in decimal degrees. The
hemisphere is determined by the sign (north and east are positive).
If this coordinate describes a latitude, this value must be within
-90.0 and +90.0 (exclusive). If this value describes a longitude,
this value must be within -180.0 and +180.0 (exclusive).
@type angle: C{float}
@param coordinateType: The coordinate type. One of L{Angles.LATITUDE},
L{Angles.LONGITUDE} or L{None} if unknown.
NzQcoordinateType must be one of Angles.LATITUDE, Angles.LONGITUDE or None, was {!r})r
r r rX rY rF r^ )r" r[ �coordinateTypes r r^ zCoordinate.__init__ sK � � �&�/�/�6�3C�3C�T�!J� J� �5�5;�V�N�5K��
�
���t�U�N�3r c �D � | j t j u r/| j dk rt j
S t j S | j t j u r/| j dk rt j S t j S t d� �)z�
Gets the hemisphere of this coordinate.
@return: A symbolic constant representing a hemisphere (one of
L{Angles})
r z.unknown coordinate type (cant find hemisphere)) rS r
r rT r r r r r r rX ra s r �
hemispherezCoordinate.hemisphere� sz � � �>�>�V�_�_� ,��$�$�q�(�!�'�'�'�!�'�'�'�
�^�^�v� /� /�
/��$�$�q�(�!���&�!���&� � M�N� Nr �N)r r r r r^ r� r� r r r r� r� u s" � ��4�* �O� �Or r� c �L � e Zd ZdZdZd� Zed� � Zed� � Zd� Z de
fd�Z y )
�Altitudez�
An altitude.
@ivar inMeters: The altitude represented by this object, in meters. This
attribute is read-only.
@type inMeters: C{float}
@ivar inFeet: As above, but expressed in feet.
@type inFeet: C{float}
)�inMetersc � � || _ y)z}
Initializes an altitude.
@param altitude: The altitude in meters.
@type altitude: C{float}
N�� _altituder9 s r r^ zAltitude.__init__� s � � "��r c �( � | j t z S )z�
Gets the altitude this object represents, in feet.
@return: The altitude, expressed in feet.
@rtype: C{float}
)r� �METERS_PER_FOOTra s r �inFeetzAltitude.inFeet� s � � �~�~��/�/r c � � | j S )z�
Returns the altitude this object represents, in meters.
@return: The altitude, expressed in feet.
@rtype: C{float}
r� ra s r r� zAltitude.inMeters� s � � �~�~� r c � � | j S )z�
Returns the altitude represented by this object expressed in meters.
@return: The altitude represented by this object, expressed in meters.
@rtype: C{float}
r� ra s r ru zAltitude.__float__� s � � �~�~� r rv c �" � d| j � d�S )z�
Returns a string representation of this altitude.
@return: The string representation.
@rtype: C{str}
z <Altitude (z m)>r� ra s r r| zAltitude.__repr__� s � � �T�^�^� ,�D�1�1r N) r r r r rU r^ r� r� r� ru r� r| r r r r� r� � sM � � � &��"� �0� �0� � � � � �2�#� 2r r� c �L � e Zd ZdZdZd� Zed� � Zed� � Zd� Z de
fd�Z y )
�
_BaseSpeedz�
An object representing the abstract concept of the speed (rate of
movement) of a mobile object.
This primarily has behavior for converting between units and comparison.
)�inMetersPerSecondc � � || _ y)a2
Initializes a speed.
@param speed: The speed that this object represents, expressed in
meters per second.
@type speed: C{float}
@raises ValueError: Raised if value was invalid for this particular
kind of speed. Only happens in subclasses.
N��_speedr* s r r^ z_BaseSpeed.__init__� s � � �� r c � � | j S )z�
The speed that this object represents, expressed in meters per second.
This attribute is immutable.
@return: The speed this object represents, in meters per second.
@rtype: C{float}
r� ra s r r� z _BaseSpeed.inMetersPerSecond rb r c �( � | j t z S )z�
Returns the speed represented by this object, expressed in knots. This
attribute is immutable.
@return: The speed this object represents, in knots.
@rtype: C{float}
)r� � MPS_PER_KNOTra s r �inKnotsz_BaseSpeed.inKnots s � � �{�{�\�)�)r c � � | j S )z�
Returns the speed represented by this object expressed in meters per
second.
@return: The speed represented by this object, expressed in meters per
second.
@rtype: C{float}
r� ra s r ru z_BaseSpeed.__float__ rb r rv c �h � t | j d� }d| j j � d|� d�S )z�
Returns a string representation of this speed object.
@return: The string representation.
@rtype: C{str}
r~ �<z (z m/s)>)r r� � __class__r )r" �
speedValues r r| z_BaseSpeed.__repr__! s6 � � �4�1�1�1�5�
��4�>�>�*�*�+�2�j�\��@�@r N) r r r r rU r^ r� r� r� ru r� r| r r r r� r� � sO � �� /�� � �� �� �*� �*� �A�#� Ar r� c � � e Zd ZdZd� Zy)�Speedz:
The speed (rate of movement) of a mobile object.
c �V � |dk rt d|��� �t j | |� y)z�
Initializes a L{Speed} object.
@param speed: The speed that this object represents, expressed in
meters per second.
@type speed: C{float}
@raises ValueError: Raised if C{speed} is negative.
r znegative speed: N)rX r� r^ r* s r r^ zSpeed.__init__1 s. � � �1�9� � /��y� 9�:� :����D�%�(r N�r r r r r^ r r r r� r� , s � ��
)r r� c � � e Zd ZdZd� Zy)�Climbz4
The climb ("vertical speed") of an object.
c �0 � t j | |� y)z�
Initializes a L{Climb} object.
@param climb: The climb that this object represents, expressed in
meters per second.
@type climb: C{float}
N)r� r^ r. s r r^ zClimb.__init__F s � � ���D�%�(r Nr� r r r r� r� A s � ��)r r� c � � e Zd ZdZdZdd�ZdZd� Zd� d� gd � d
� gd � d � gd�Zd
� Z d� Z
e d� � Z e j d� � Z e d� � Zej d� � Ze d� � Zej d� � ZdZdefd�Zy)�
PositionErrora#
Position error information.
@cvar _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 _ALLOWABLE_THRESHOLD: C{float}
@cvar _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
C{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 _DOP_EXPRESSIONS: C{dict} of C{str} to callables
@ivar pdop: The position dilution of precision. L{None} if unknown.
@type pdop: C{float} or L{None}
@ivar hdop: The horizontal dilution of precision. L{None} if unknown.
@type hdop: C{float} or L{None}
@ivar vdop: The vertical dilution of precision. L{None} if unknown.
@type vdop: C{float} or L{None}
)�pdop�hdop�vdopNc �\ � || _ || _ || _ || _ | j � y)a�
Initializes a positioning error object.
@param pdop: The position dilution of precision. L{None} if unknown.
@type pdop: C{float} or L{None}
@param hdop: The horizontal dilution of precision. L{None} if unknown.
@type hdop: C{float} or L{None}
@param vdop: The vertical dilution of precision. L{None} if unknown.
@type vdop: C{float} or L{None}
@param testInvariant: Flag to test if the DOP invariant is valid or
not. If C{True}, the invariant (PDOP = (HDOP**2 + VDOP**2)*.5) is
checked at every mutation. By default, this is false, because the
vast majority of DOP-providing devices ignore this invariant.
@type testInvariant: c{bool}
N)�_pdop�_hdop�_vdop�_testInvariant� _testDilutionOfPositionInvariant)r" r� r� r� �
testInvariants r r^ zPositionError.__init__i s- � � ��
���
���
� +��� �-�-�/r g{�G�z�?c �h � | j sy| j | j | j fD ] }|�� y t | j | j dz | j dz z dz z
� }|| j
kD r2t
d| j �d| j �d| j ��� �y)a�
Tests if this positioning error object satisfies the dilution of
position invariant (PDOP = (HDOP**2 + VDOP**2)*.5), unless the
C{self._testInvariant} instance variable is C{False}.
@return: L{None} if the invariant was not satisfied or not tested.
@raises ValueError: Raised if the invariant was tested but not
satisfied.
Nr~ � �?z9invalid combination of dilutions of precision: position: z, horizontal: z , vertical: )r� r� r� r� re �_ALLOWABLE_TRESHOLDrX )r" �x�deltas r r� z.PositionError._testDilutionOfPositionInvariant� s� � � �"�"� ��)�)�T�Y�Y�� � �2� �A��y�� � �D�I�I����A� �� � �1� �!<�� D�D�E�� �4�+�+� +� � �9�9�d�i�i����4��
� ,r c �, � t | j � S r� )�floatr� ra s r rH zPositionError.<lambda>� � � ��t�z�z�*� r c �F � | j dz | j dz z dz S �Nr~ r� )r� r� ra s r rH zPositionError.<lambda>� � � �$�*�*�a�-�$�*�*�a�-�7�C�?� r c �, � t | j � S r� )r� r� ra s r rH zPositionError.<lambda>� r� r c �F � | j dz | j dz z
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Gets a particular dilution of position value.
@param dopType: The type of dilution of position to get. One of
('pdop', 'hdop', 'vdop').
@type dopType: C{str}
@return: The DOP if it is known, L{None} otherwise.
@rtype: C{float} or L{None}
N)�_DOP_EXPRESSIONS� TypeError)r" �dopType�
dopExpressions r �_getDOPzPositionError._getDOP� sB � � "� 2� 2�7� ;� �M�
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Sets a particular dilution of position value.
@param dopType: The type of dilution of position to set. One of
('pdop', 'hdop', 'vdop').
@type dopType: C{str}
@param value: The value to set the dilution of position type to.
@type value: C{float}
If this position error tests dilution of precision invariants,
it will be checked. If the invariant is not satisfied, the
assignment will be undone and C{ValueError} is raised.
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attributeName�oldValues r �_setDOPzPositionError._setDOP� sX � � �g�
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��4� �/����m�U�5�\�2� � � 1� 1� 3��� � �D�-�� 2� � �s �: �Ac �$ � | j d� S �Nr� �r� ra s r r� zPositionError.pdop� � � ��|�|�F�#�#r c �& � | j d|� S r� �r� �r" r� s r r� zPositionError.pdop� � � ��|�|�F�E�*�*r c �$ � | j d� S �Nr� r� ra s r r� zPositionError.hdop� r� r c �& � | j d|� S r� r� r� s r r� zPositionError.hdop� r� r c �$ � | j d� S �Nr� r� ra s r r� zPositionError.vdop� r� r c �& � | j d|� S r� r� r� s r r� zPositionError.vdop� r� r z.<PositionError (pdop: %s, hdop: %s, vdop: %s)>rv c �b � | j | j | j | j fz S )z�
Returns a string representation of positioning information object.
@return: The string representation.
@rtype: C{str}
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�[�[�+� �+� F�N�G�#� Gr r� c �$ � e Zd ZdZdd�Zdefd�Zy)�BeaconInformationa�
Information about positioning beacons (a generalized term for the reference
objects that help you determine your position, such as satellites or cell
towers).
@ivar seenBeacons: A set of visible beacons. Note that visible beacons are not
necessarily used in acquiring a positioning fix.
@type seenBeacons: C{set} of L{IPositioningBeacon}
@ivar usedBeacons: A set of the beacons that were used in obtaining a
positioning fix. This only contains beacons that are actually used, not
beacons for which it is unknown if they are used or not.
@type usedBeacons: C{set} of L{IPositioningBeacon}
c �B � t |� | _ t � | _ y)z�
Initializes a beacon information object.
@param seenBeacons: A collection of beacons that are currently seen.
@type seenBeacons: iterable of L{IPositioningBeacon}s
N)�set� seenBeacons� usedBeacons)r" r� s r r^ zBeaconInformation.__init__ s � � �{�+��� �5��r rv c �� � t t t d� �� } || j � } || j | j z
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Returns a string representation of this beacon information object.
The beacons are sorted by their identifier.
@return: The string representation.
@rtype: C{str}
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identifier)�keyz^<BeaconInformation (used beacons ({numUsed}): {usedBeacons}, unused beacons: {unusedBeacons})>)�numUsedr �
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A positioning beacon.
@ivar identifier: The unique identifier for this beacon. This is usually
an integer. For GPS, this is also known as the PRN.
@type identifier: Pretty much anything that can be used as a unique
identifier. Depends on the implementation.
c � � || _ y)z�
Initializes a positioning beacon.
@param identifier: The identifier for this beacon.
@type identifier: Can be pretty much anything (see ivar documentation).
N�r )r" r s r r^ zPositioningBeacon.__init__9 s � � %��r c �, � t | j � S )z�
Returns the hash of the identifier for this beacon.
@return: The hash of the identifier. (C{hash(self.identifier)})
@rtype: C{int}
)�hashr ra s r �__hash__zPositioningBeacon.__hash__B s � � �D�O�O�$�$r rv c �" � d| j � d�S )z�
Returns a string representation of this beacon.
@return: The string representation.
@rtype: C{str}
z <Beacon (z)>r ra s r r| zPositioningBeacon.__repr__K s � � �4�?�?�+�2�.�.r N)r r r r r^ r r� r| r r r r r . s � ��%�%�/�#� /r r c �& � e Zd ZdZ dd�Zdefd�Zy)� Satellitea�
A satellite.
@ivar azimuth: The azimuth of the satellite. This is the heading (positive
angle relative to true north) where the satellite appears to be to the
device.
@ivar elevation: The (positive) angle above the horizon where this
satellite appears to be to the device.
@ivar signalToNoiseRatio: The signal to noise ratio of the signal coming
from this satellite.
Nc �l � t j | t |� � || _ || _ || _ y)ar
Initializes a satellite object.
@param identifier: The PRN (unique identifier) of this satellite.
@type identifier: C{int}
@param azimuth: The azimuth of the satellite (see instance variable
documentation).
@type azimuth: C{float}
@param elevation: The elevation of the satellite (see instance variable
documentation).
@type elevation: C{float}
@param signalToNoiseRatio: The signal to noise ratio of the connection
to this satellite (see instance variable documentation).
@type signalToNoiseRatio: C{float}
N)r r^ rf �azimuth� elevation�signalToNoiseRatio)r" r r r r s r r^ zSatellite.__init__b s. � �$ �"�"�4��Z� �9� �� �"���"4�� r rv c �* � d}|j | �� S )z�
Returns a string representation of this Satellite.
@return: The string representation.
@rtype: C{str}
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