utils.py 文件源码

def get_gains(dist=70):
    """Returns lat and lon gain

    Gain is space between circles.
    """
    start = Point(*bounds.center)
    base = dist * sqrt(3)
    height = base * sqrt(3) / 2
    dis_a = distance(meters=base)
    dis_h = distance(meters=height)
    lon_gain = dis_a.destination(point=start, bearing=90).longitude
    lat_gain = dis_h.destination(point=start, bearing=0).latitude
    return abs(start.latitude - lat_gain), abs(start.longitude - lon_gain)