leancloud.geo_point 源代码

# coding: utf-8

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import math


__author__ = 'asaka <lan@leancloud.rocks>'


[文档]class GeoPoint(object): def __init__(self, latitude=0, longitude=0): """ :param latitude: 纬度 :type latitude: int or float :param longitude: 经度 :type longitude: int or float :return: GeoPoint """ self._validate(latitude, longitude) self._latitude = latitude self._longitude = longitude @classmethod def _validate(cls, latitude, longitude): if latitude < -90.0: raise ValueError('GeoPoint latitude {0} < -90.0'.format(latitude)) if latitude > 90.0: raise ValueError('GeoPoint latitude {0} > 90.0'.format(latitude)) if longitude < -180.0: raise ValueError('GeoPoint longitude {0} < -180.0'.format(longitude)) if longitude > 180.0: raise ValueError('GeoPoint longitude {0} > 180.0'.format(longitude)) @property def latitude(self): """ 当前对象的纬度 """ return self._latitude @latitude.setter def latitude(self, latitude): self._validate(latitude, self.longitude) self._latitude = latitude @property def longitude(self): """ 当前对象的经度 """ return self._longitude @longitude.setter def longitude(self, longitude): self._validate(self.latitude, longitude) self._longitude = longitude
[文档] def dump(self): self._validate(self.latitude, self.longitude) return { '__type': 'GeoPoint', 'latitude': self.latitude, 'longitude': self.longitude, }
[文档] def radians_to(self, other): """ Returns the distance from this GeoPoint to another in radians. :param other: point the other GeoPoint :type other: GeoPoint :rtype: float """ d2r = math.pi / 180.0 lat1rad = self.latitude * d2r long1rad = self.longitude * d2r lat2rad = other.latitude * d2r long2rad = other.longitude * d2r delta_lat = lat1rad - lat2rad delta_long = long1rad - long2rad sin_delta_lat_div2 = math.sin(delta_lat / 2.0) sin_delta_long_div2 = math.sin(delta_long / 2.0) a = ((sin_delta_lat_div2 * sin_delta_lat_div2) + (math.cos(lat1rad) * math.cos(lat2rad) * sin_delta_long_div2 * sin_delta_long_div2)) a = min(1.0, a) return 2 * math.asin(math.sqrt(a))
[文档] def kilometers_to(self, other): """ Returns the distance from this GeoPoint to another in kilometers. :param other: point the other GeoPoint :type other: GeoPoint :rtype: float """ return self.radians_to(other) * 6371.0
[文档] def miles_to(self, other): """ Returns the distance from this GeoPoint to another in miles. :param other: point the other GeoPoint :type other: GeoPoint :rtype: float """ return self.radians_to(other) * 3958.8
def __eq__(self, other): return \ isinstance(other, GeoPoint) and \ self.latitude == other.latitude and \ self.longitude == other.longitude