/// <summary>
/// Returns 8 sorrounding cells + the center cell of type 'Wall'.
/// May return fewer if the cellIndex is near the sides/corners of the arena.
/// </summary>
/// <param name="cellIndex">(x,y) indices of the center cells</param>
/// <returns></returns>
IEnumerable <Vector2> GetSurroundingWallCellsCenters(Arena.Coords cell, Arena a)
{
for (int yDelta = -1; yDelta <= 1; ++yDelta)
{
for (int xDelta = -1; xDelta <= 1; ++xDelta)
{
int x = cell.x + xDelta;
int y = cell.y + yDelta;
if (x >= 0 && y >= 0 && x < a.Size && y < a.Size && a[x, y] == Arena.CellType.wall)
{
yield return(CalcPosFromCellCords(new Arena.Coords(x, y), a));
}
}
}
}
static Vector2 CalcPosFromCellCords(Arena.Coords coords, Arena a)
{
return(Arena.origin + new Vector2(coords.x, coords.y) * Arena.offset * Arena.boundingBox);
}