function f(t) {
				var count = getIterations(start, t);
				length += start < t
						? Numerical.integrate(ds, start, t, count)
						: -Numerical.integrate(ds, t, start, count);
				start = t;
				return length - offset;
			}
// modifing start and calculating total length each time.
modifing start and calculating total length each time.
modifing start and calculating total length each time .
function f(t) {
				var count = getIterations(start, t);
				length += start < t
						? Numerical.integrate(ds, start, t, count)
						: -Numerical.integrate(ds, t, start, count);
				start = t;
				return length - offset;
			}
function f ( t ) { var count = getIterations ( start , t ) ; length += start < t ? Numerical . integrate ( ds , start , t , count ) : - Numerical . integrate ( ds , t , start , count ) ; start = t ; return length - offset ; }
modifing start and calculating total length each time.
modifing start and calculating total length each time .