public bool MoveNext()
{
if (_copy.IsEmpty())
{
return(false);
}
Current = _copy.DelMin();
return(Current != null);
}
/// <summary>
/// Simulates the system of particles for the specified amount of time.
/// </summary>
/// <param name="limit">the amount of time</param>
public IEnumerator Simulate(double limit, double hz)
{
Start(limit);
while (!_pq.IsEmpty())
{
// get impending event, discard if invalidated
Event e = _pq.DelMin();
if (!e.IsValid())
{
continue;
}
Particle a = e.A;
Particle b = e.B;
// physical collision, so update positions, and then simulation clock
for (int i = 0; i < _particles.Length; i++)
{
_particles[i].Move(e.Time - _t);
}
_t = e.Time;
// process event
if (a != null && b != null)
{
a.BounceOff(b); // particle-particle collision
}
else if (a != null && b == null)
{
a.BounceOffVerticalWall(); // particle-wall collision
}
else if (a == null && b != null)
{
b.BounceOffHorizontalWall(); // particle-wall collision
}
else if (a == null && b == null)
{
yield return(sWaitForSeconds);
Redraw(limit, hz); // redraw event
}
// update the priority queue with new collisions involving a or b
Predict(a, limit);
Predict(b, limit);
}
}