85e4656c1c
added driven_km, gps_location to property -> location is automatically updated on property call
98 lines
2.9 KiB
Python
98 lines
2.9 KiB
Python
import time
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from datetime import datetime
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from typing import Union
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import geopy
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import geopy.distance
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from circuitbreaker import circuit
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from daf import DAF
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# Lat, Long
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STARTING_POINT = geopy.Point(48.853, 2.349)
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# in km/h
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STARTING_VELOCITY = 130
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# Driving direction in degrees: 0=N, 90=E, 180=S, 270=W
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BEARING = 90
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# Scale speed of vehicles by factor x
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SCALING = 1
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class Vehicle:
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vin: str
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velocity: float
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timestamp: Union[datetime, None]
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_driven_kms: int
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_gps_location: geopy.Point
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def __init__(self,
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vin: str,
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starting_point: geopy.Point = STARTING_POINT,
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starting_velocity: float = STARTING_VELOCITY):
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self.vin = vin
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self._gps_location = starting_point
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self.velocity = starting_velocity
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def daf(self, invoke_nce=False):
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return DAF(vehicle_identification_number=self.vin,
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gps_location=self.gps_location,
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velocity=self.velocity,
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timestamp=self.timestamp,
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near_crash_event=invoke_nce
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)
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@property
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def gps_location(self):
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"""
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Update self.gps_location with given speed in km/h and the driven time in seconds
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:param velocity: in km/h
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:param time: in seconds
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:param bearing: direction in degrees: 0=N, 90=E, 180=S, 270=W
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"""
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# Define starting point.
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start = self._gps_location
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# Get old and updated timestamps
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old_timestamp = self.timestamp
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updated_timestamp = datetime.now()
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self.timestamp = updated_timestamp
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# get driving time between timestamps (in seconds)
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driving_time = (updated_timestamp - old_timestamp).total_seconds()
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# reached distance in kilometers: convert km/h to km/s and multiply by driving time
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kilometers = self.velocity / 3600 * driving_time * SCALING
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# Define a general distance object, initialized with a distance of 1 km.
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d = geopy.distance.distance(kilometers=kilometers)
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# Use the `destination` method with a bearing of bearing degrees (90 is east)
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# in order to go from point `start` to kilometers km bearing.
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self._gps_location = d.destination(point=start, bearing=BEARING)
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# update driven kilometers
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self._driven_kms += kilometers
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return self._gps_location
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@property
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def driven_kms(self):
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return '{}km'.format(round(self._driven_kms, 2))
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def start_driving(self):
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self.timestamp = datetime.now()
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self._driven_kms = 0
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def stop_driving(self):
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self.timestamp = None
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@circuit(failure_threshold=10, expected_exception=ConnectionError)
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def external_call(self):
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...
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if __name__ == "__main__":
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v1 = Vehicle(vin='SB164ABN1PE082986')
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v1.start_driving()
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print(v1.gps_location, v1.driven_kms)
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time.sleep(1)
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print(v1.gps_location, v1.driven_kms)
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