public void FillBucket(GameObject gameObject)
{
CollisionBucket bucket = FetchBucket(gameObject);
if (bucket == null)
{
return;
}
bucket.AddElement(gameObject);
}
public Boolean RemoveFromBucketIfExists(GameObject gameObject)
{
var t = gameObject;
CollisionBucket bucket = FetchBucket(gameObject);
if (bucket == null)
{
return(false);
}
return(bucket.RemoveElement(gameObject));
}
private CollisionBucket FetchBucket(GameObject gameObject)
{
Vector2 coordinates = GetCoordinates(gameObject.Position);
if (!IsValidBucketCoordinates((int)coordinates.X, (int)coordinates.Y))
{
return(null);
}
CollisionBucket bucket = collisionBuckets[(int)coordinates.X][(int)coordinates.Y];
return(bucket);
}
private CollisionBucket FetchBucket(GameObject gameObject, int xOffset, int yOffset)
{
Vector2 coordinates = GetCoordinates(gameObject.Position);
/* If the coordinates are out of bounds, we return null. */
if (!IsValidBucketCoordinates((int)coordinates.X + xOffset, (int)coordinates.Y + yOffset))
{
return(null);
}
CollisionBucket bucket = collisionBuckets[(int)coordinates.X + xOffset][(int)coordinates.Y + yOffset];
return(bucket);
}
public HashSet <GameObject> GetObjectsCollided(GameObject gameObject, Type type) /* Optional filter parameter */
{
HashSet <GameObject> ret = new HashSet <GameObject>();
double radius = gameObject.HitBoxRadius;
/* Directions */
int[,] dirs = new int[, ] {
{ 1, 1 }, { 0, 1 }, { -1, 1 },
{ 1, 0 }, { 0, 0 }, { -1, 0 },
{ 1, -1 }, { 0, -1 }, { -1, -1 }
};
/* Check all neighboring cells */
for (int i = 0; i < 9; ++i)
{
int xOffset = dirs[i, 0];
int yOffset = dirs[i, 1];
CollisionBucket cb = FetchBucket(gameObject, xOffset, yOffset);
/* null indicates that the coordinates were invalid */
if (cb != null)
{
/* For all game objects in the bucket, if within the collision region add to return set */
foreach (GameObject go in cb.GetObjects())
{
if (!go.GetType().IsSubclassOf(type) && !go.GetType().Equals(type))
{
continue;
}
if (gameObject.BoundsContains(go.Position) ||
go.BoundsContains(gameObject.Position))
{
ret.Add(go);
}
}
}
}
return(ret);
}