Esempio n. 1
0
def fetch(x_beg, x_end, y_beg, y_end, time_bin):
    global Point_RDD
    global coordinate_cache
    global DEFAULT_CACHE_SIZE

    filtered = filter(lambda pr: x_end > pr[0] > x_beg and y_end > pr[1] > y_beg, coordinate_cache)
    visible_area = area(x_beg, x_end, y_beg, y_end)
    s_area = sample_area(filtered)
    if s_area < visible_area/20:
        print "zooming out"

    print len(filtered)
    if len(filtered) < SAMPLE_SIZE or s_area <= visible_area/20:
        filtered_RDD = Point_RDD.filter(lambda pr: x_end > pr[0] > x_beg and y_end > pr[1] > y_beg)
        coordinate_cache = filtered_RDD.takeSample(False, DEFAULT_CACHE_SIZE)
        if len(coordinate_cache) < DEFAULT_CACHE_SIZE:
            flag_limit_reached = True
    filtered = filter(lambda pr: x_end > pr[0] > x_beg and y_end > pr[1] > y_beg, coordinate_cache)
    print len(filtered)
    return Sampling.sample_unzip(filtered, SAMPLE_SIZE)
Esempio n. 2
0
def get_current():
    sample_array = Sampling.sample_unzip(coordinate_cache, SAMPLE_SIZE)
    return sample_array