public void Update(IQuadTreeMonitor <T> monitor, Bound previousRegion, Bound currentRegion)
{
// update the stored monitor
for (int i = 0; i < _monitors.Length; ++i)
{
if (ReferenceEquals(_monitors[i].Monitor, monitor))
{
_monitors[i].Region = currentRegion;
break;
}
}
// update the monitor
for (int i = 0; i < _items.Length; ++i)
{
StoredItem item = _items[i];
bool containedPrevious = previousRegion.Contains(item.Position);
bool containedCurrent = currentRegion.Contains(item.Position);
// the monitor was previously interested but no longer is
if (containedPrevious && containedCurrent == false)
{
monitor.OnExit(item.Item);
}
// the monitor was not previous interested but now is
else if (containedPrevious == false && containedCurrent)
{
monitor.OnEnter(item.Item);
}
}
}
public void Remove(IQuadTreeMonitor <T> monitor, Bound monitoredRegion)
{
// remove the stored monitor
for (int i = 0; i < _monitors.Length; ++i)
{
if (ReferenceEquals(_monitors[i].Monitor, monitor))
{
_monitors.Remove(i);
break;
}
}
// remove all stored items from the monitor
for (int i = 0; i < _items.Length; ++i)
{
StoredItem item = _items[i];
if (monitoredRegion.Contains(item.Position))
{
monitor.OnExit(item.Item);
}
}
}
