sphere.py 文件源码

def get_distance(self, other):
        assert self.is_valid()
        assert other.is_valid()

        from_lat = self.lat().radians
        to_lat = other.lat().radians
        from_lng = self.lng().radians
        to_lng = other.lng().radians
        dlat = math.sin(0.5 * (to_lat - from_lat))
        dlng = math.sin(0.5 * (to_lng - from_lng))
        x = dlat * dlat + dlng * dlng * math.cos(from_lat) * math.cos(to_lat)
        return Angle.from_radians(
            2 * math.atan2(math.sqrt(x), math.sqrt(max(0.0, 1.0 - x)))
        )