public void Tick()
{
if (GameOver)
{
return;
}
Tile tile = _board.GetTileInDirection(_snake.Head.Tile, _input.GetInputDirection());
if (tile == null || tile.HasSnake) // End if head hits bounds or body segment
{
GameOver = true;
return;
}
List <SnakeSegment> segments = _snake.Segments;
int segmentsCount = segments.Count;
SnakeSegment newSegment = null;
Tile prevTile = _snake.Head.Tile;
if (tile.HasFood)
{
newSegment = new SnakeSegment();
var lastSegment = segments[segmentsCount - 1];
newSegment.Tile = lastSegment.Tile;
tile.HasFood = false;
}
MoveSegmentToTile(_snake.Head, tile);
for (int i = 1; i < segmentsCount; i++) // Move Snake Segments
{
SnakeSegment segment = segments[i];
tile = prevTile;
prevTile = segment.Tile;
MoveSegmentToTile(segment, tile);
}
if (newSegment != null)
{
newSegment.Tile.HasSnake = true;
_snake.Segments.Add(newSegment);
if (CheckGameOver())
{
return;
}
_foodSpawner.SpawnFood(_board);
}
}
private void MoveSegmentToTile(SnakeSegment segment, Tile tile)
{
segment.Tile.HasSnake = false;
segment.Tile = tile;
tile.HasSnake = true;
}