public FloodVisitor4(NativeArray2D <T> array, TVisitAction action)
{
this.array = array;
this.action = action;
}
public void FloodVisit8(int startX, int startY, IEqualityComparer <T> comparer = null)
{
if (startX < 0 || startX >= array.LengthX)
{
throw new ArgumentOutOfRangeException(nameof(startX));
}
if (startY < 0 || startY >= array.LengthY)
{
throw new ArgumentOutOfRangeException(nameof(startY));
}
if (comparer == null)
{
comparer = EqualityComparer <T> .Default;
}
var processed = new NativeArray2D <bool>(array.LengthX, array.LengthY, Allocator.Temp);
T value = array[startX, startY];
var queue = new Queue <Vector2Int>();
queue.Enqueue(new Vector2Int(startX, startY));
processed[startX, startY] = true;
void process(ref NativeArray2D <T> array, int x, int y)
{
if (!processed[x, y])
{
if (comparer.Equals(array[x, y], value))
{
queue.Enqueue(new Vector2Int(x, y));
}
processed[x, y] = true;
}
}
while (queue.Count > 0)
{
Vector2Int cell = queue.Dequeue();
bool xGreaterThanZero = cell.x > 0;
bool xLessThanWidth = cell.x + 1 < array.LengthX;
bool yGreaterThanZero = cell.y > 0;
bool yLessThanHeight = cell.y + 1 < array.LengthY;
if (yGreaterThanZero)
{
if (xGreaterThanZero)
{
process(ref array, cell.x - 1, cell.y - 1);
}
process(ref array, cell.x, cell.y - 1);
if (xLessThanWidth)
{
process(ref array, cell.x + 1, cell.y - 1);
}
}
if (xGreaterThanZero)
{
process(ref array, cell.x - 1, cell.y);
}
if (xLessThanWidth)
{
process(ref array, cell.x + 1, cell.y);
}
if (yLessThanHeight)
{
if (xGreaterThanZero)
{
process(ref array, cell.x - 1, cell.y + 1);
}
process(ref array, cell.x, cell.y + 1);
if (xLessThanWidth)
{
process(ref array, cell.x + 1, cell.y + 1);
}
}
action.Visit(cell.x, cell.y);
}
}