public IEnumerable <int> GetNeighbourIndex(FluidParticle particle)
{
for (int xOff = -1; xOff < 2; xOff++)
{
for (int yOff = -1; yOff < 2; yOff++)
{
// Own index
//if (xOff == 0 && yOff == 0)
//{
// continue;
//}
// Neighbour index
int x = GetGridIndexX(particle) + xOff;
int y = GetGridIndexY(particle) + yOff;
// Clamp
if (x > -1 && x < this.Width && y > -1 && y < this.Height)
{
List <int> idxList = m_grid[x, y];
if (idxList != null)
{
// Return neighbours index
foreach (var idx in idxList)
{
yield return(idx);
}
}
}
}
}
}
private int GetGridIndexY(FluidParticle particle)
{
int gridIndexY = (int)(particle.Position.Y / this.CellSpace);
// Clamp Y
if (gridIndexY < 0)
{
gridIndexY = 0;
}
if (gridIndexY >= this.Height)
{
gridIndexY = this.Height - 1;
}
return(gridIndexY);
}
private int GetGridIndexX(FluidParticle particle)
{
int gridIndexX = (int)(particle.Position.X / this.CellSpace);
// Clamp X
if (gridIndexX < 0)
{
gridIndexX = 0;
}
if (gridIndexX >= this.Width)
{
gridIndexX = this.Width - 1;
}
return(gridIndexX);
}
