/** Get a Spring instance and set it to the given parameters. */
public Spring getSpring(ForceItem f1, ForceItem f2, float k, float length) {
if (springs.size() > 0) {
Spring s = (Spring) springs.remove(springs.size() - 1);
s.item1 = f1;
s.item2 = f2;
s.coeff = k;
s.length = length;
return s;
} else {
return new Spring(f1, f2, k, length);
}
}
