thanks for the tip! i will implement after 12 OCT 2008 as i am going to USA and Canada for holiday.
i have not used "+=" before
At constraint page add the following lines:
d+= Math.sqrt((x-xs)*(x-xs)+(y-ys)*(y-ys)); [b][color=blue]// what is += ?? is it a syntax for line integral of absolute value of displacement.[/color][/b]
that is so cool!