public List <int> PossibleNeighbors(FluidManager.Particle p)
{
List <int> possibleNeighbors = new List <int>();
int x = (int)(p.pos.x / range);
int y = (int)(p.pos.y / range);
int key = GetKey(x, y);
possibleNeighbors.AddRange(hashTable[key]);
key = GetKey(x, y + 1);
possibleNeighbors.AddRange(hashTable[key]);
key = GetKey(x, y - 1);
possibleNeighbors.AddRange(hashTable[key]);
key = GetKey(x + 1, y);
possibleNeighbors.AddRange(hashTable[key]);
key = GetKey(x + 1, y + 1);
possibleNeighbors.AddRange(hashTable[key]);
key = GetKey(x + 1, y - 1);
possibleNeighbors.AddRange(hashTable[key]);
key = GetKey(x - 1, y);
possibleNeighbors.AddRange(hashTable[key]);
key = GetKey(x - 1, y + 1);
possibleNeighbors.AddRange(hashTable[key]);
key = GetKey(x - 1, y - 1);
possibleNeighbors.AddRange(hashTable[key]);
return(possibleNeighbors);
}
public void MoveParticle(ref FluidManager.Particle p)
{
int x = (int)((p.pos.x / range));
int y = (int)((p.pos.y / range));
int key = GetKey(x, y);
//If p still on same cell, do nothing
if (key == p.hashKey)
{
return;
}
//Else move p to the fine cell
hashTable[key].Add(p.index);
if (p.hashKey != -1)
{
hashTable[p.hashKey].Remove(p.index);
}
p.hashKey = key;
}