step method
void
step()
Implementation
void step() {
_processScheduledReleases();
_integrate();
final int count = springs.length;
for (int it = 0; it < _iterations; it++) {
for (int i = 0; i < count; i++) {
springs[i].satisfy();
}
_applyGrab();
}
_breakOverstretched();
_measureMotion();
}