public FluidSimulation(World world)
{
this._world = world;
_activeParticles = new List<int>(MAX_PARTICLES);
_liquid = new Particle[MAX_PARTICLES];
for (int i = 0; i < MAX_PARTICLES; i++)
{
_liquid[i] = new Particle(Vector2.Zero, Vector2.Zero, false);
_liquid[i].index = i;
}
_delta = new Vector2[MAX_PARTICLES];
_scaledPositions = new Vector2[MAX_PARTICLES];
_scaledVelocities = new Vector2[MAX_PARTICLES];
_grid = new Dictionary<int, Dictionary<int, List<int>>>();
_halfScreen = new Vector2(
GeneralManager.ScreenX,
GeneralManager.ScreenY) / 2f;
_simulationAABB.LowerBound.X = 0;//-(_halfScreen.X + 100f);
_simulationAABB.LowerBound.Y = 0;//-(_halfScreen.Y + 100f);
_simulationAABB.UpperBound.X = 1000;//_halfScreen.X + 100f;
_simulationAABB.UpperBound.Y = -1000;//_halfScreen.Y + 100f;
}
private void findNeighbors(Particle particle)
{
particle.neighborCount = 0;
Dictionary<int, List<int>> gridX;
List<int> gridY;
for (int nx = -1; nx < 2; nx++)
{
for (int ny = -1; ny < 2; ny++)
{
int x = particle.ci + nx;
int y = particle.cj + ny;
if (_grid.TryGetValue(x, out gridX) && gridX.TryGetValue(y, out gridY))
{
for (int a = 0; a < gridY.Count; a++)
{
if (gridY[a] != particle.index)
{
particle.neighbors[particle.neighborCount] = gridY[a];
particle.neighborCount++;
if (particle.neighborCount >= MAX_NEIGHBORS)
return;
}
}
}
}
}
}