Setalpha by distance traveled

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Jeremy Paxman - Yeeeeeeeees
 #1
first you need to work out the distance:

Function distance#(x1, y1, x2, y2)
Local x=Abs(x1-x2)
Local y=Abs(y1-y2)
Return x+y
End Function

then, calcuate a number from zero to one based on distance

particle_alpha#=distance()/maxdistance#

make sure all numbers are floats involved in the calculation