
r=!random $rg*0.7, $rg*1.6
v=$[2*$rg-$r]
s=!random $v*0.05,$v*0.95

y1=$[-$rg+$s]
y2=$[$y1+$r]

f=!rawmath $[$r/(2*$rg)]*t+$[($y1+$y2)/2]

