Knowing the coordinates of sliding verification, what algorithm is used to calculate the path?

want to climb some Anjuke"s housing information. There will be sliding verification in the middle, and the coordinates can be calculated. But the path doesn"t seem to match all the time, and every time it succeeds, it pops up with a click to verify (despair). I would like to ask the great god in this respect, what algorithm can be used to calculate the path to make it more like a human slide!

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b2c3a3-2baf0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b2c3a3-2baf0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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