This function returns the value of a Manhattan distance between two points.
Demo Windows: https://www.dropbox.com/s/g0i7cm0sh5xo937/Demo.exe?dl=0
Version 1.0.0. Published March 28, 2015
Created with GameMaker: Studio v1.4.1567
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calculation is incorrect
The calculation for manhattan distance is: abs(x1-x2)+abs(y1-y2)
not what you did: max(abs(x1-x2),abs(y1-y2)).