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December 16, 2015 07:09
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A modulus-based 2D coordinate normalizer.
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| coords = ( | |
| (41.2863,-73.78689), | |
| (41.2864,-73.78690), | |
| (41.2869,-73.78698), | |
| ) | |
| from math import floor | |
| def gen_hash(coords): | |
| pro_lat = floor(coords[0]*1000.0) | |
| pro_lon = floor(coords[1]*1000.0) | |
| mod_lat = pro_lat%4.0 | |
| mod_lon = pro_lon%4.0 | |
| return 'SERVER_NAME#%s|%s:%s|%s' % (pro_lat,mod_lat,pro_lon,mod_lon) | |
| assert(gen_hash(coords[0])==gen_hash(coords[1])) | |
| assert(gen_hash(coords[0])==gen_hash(coords[2])) |
Thanks! I had thought the same thing after, I should remove the first digit of pro_lat and pro_lon, right?
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Since the key contains the entire pro_lat, concatenating prod_lat%4 achieves nothing:
pro_lat1==pro_lat2 ==> pro_lat1%4 == pro_lat2%4 (= iff... then...)
will revise it on my fork.