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decoder.py
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decoder.py
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def decode_line(encoded):
"""Decodes a polyline that was encoded using the Google Maps method.
See http://code.google.com/apis/maps/documentation/polylinealgorithm.html
This is a straightforward Python port of Mark McClure's JavaScript polyline decoder
(http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/decode.js)
and Peter Chng's PHP polyline decode
(http://unitstep.net/blog/2008/08/02/decoding-google-maps-encoded-polylines-using-php/)
"""
try:
encoded_len = len(encoded)
except:
print encoded
raise NameError("Problem")
index = 0
array = []
lat = 0
lng = 0
while index < encoded_len:
b = 0
shift = 0
result = 0
while True:
b = ord(encoded[index]) - 63
index = index + 1
result |= (b & 0x1f) << shift
shift += 5
if b < 0x20:
break
dlat = ~(result >> 1) if result & 1 else result >> 1
lat += dlat
shift = 0
result = 0
while True:
b = ord(encoded[index]) - 63
index = index + 1
result |= (b & 0x1f) << shift
shift += 5
if b < 0x20:
break
dlng = ~(result >> 1) if result & 1 else result >> 1
lng += dlng
array.append((lat * 1e-5, lng * 1e-5))
return array
if __name__ == "__main__":
latlngs = decode_line("grkyHhpc@B[[_IYiLiEgj@a@q@yEoAGi@bEyH_@aHj@m@^qAB{@IkHi@cHcAkPSiMJqEj@s@CkFp@sDfB}Ex@iBj@S_AyIkCcUWgAaA_JUyAFk@{D_]~KiLwAeCsHqJmBlAmFuXe@{DcByIZIYiBxBwAc@eCcAl@y@aEdCcBVJpHsEyAeE")
for latlng in latlngs:
print str(latlng[0]) + "," + str(latlng[1])
print decode_line("mzpdIz_ce@xDtDv@z@_EjOoBfI")