not sure if you've found an answer for this but I had a similar issue
and finally managed to solve it. Drawing lines on canvas on galaxy tab 2
and 3, also galaxy note 10.1(2012 edition, no problem on 2014 edition) can
create jagged lines. Same applies for Izzey's jsfiddle. If your issue is
the same as mine then the device is picking both mousemove and touchmove..
It basically draws the line twice with messed up mousemove values. Have a
It worked for me. I really hope this helps.. :)