pokesearch.py 文件源码

def get_new_coords(init_loc, distance, bearing):
    """ Given an initial lat/lng, a distance(in kms), and a bearing (degrees),
    this will calculate the resulting lat/lng coordinates.
    """
    R = 6378.1 #km radius of the earth
    bearing = math.radians(bearing)

    init_coords = [math.radians(init_loc[0]), math.radians(init_loc[1])] # convert lat/lng to radians

    new_lat = math.asin( math.sin(init_coords[0])*math.cos(distance/R) +
        math.cos(init_coords[0])*math.sin(distance/R)*math.cos(bearing))

    new_lon = init_coords[1] + math.atan2(math.sin(bearing)*math.sin(distance/R)*math.cos(init_coords[0]),
        math.cos(distance/R)-math.sin(init_coords[0])*math.sin(new_lat))

    return [math.degrees(new_lat), math.degrees(new_lon)]