public Snake()
{
_tail = new SnakeNode
{
Row = 0,
Col = 0
};
SnakeNode currentNode = _tail;
// -2 because of head and tail
for (int i = 0; i < Constants.INITIAL_SNAKE_BODY_LENGTH - 2; i++)
{
var newNode = new SnakeNode
{
Row = currentNode.Row,
Col = currentNode.Col + 1,
Prev = currentNode
};
currentNode.Next = newNode;
currentNode = newNode;
}
_head = new SnakeNode
{
Row = currentNode.Row,
Col = currentNode.Col + 1,
Prev = currentNode,
Symbol = GetSnakeHeadAccordingToDirection()
};
currentNode.Next = _head;
}
private void GrowNewHead()
{
SnakeNode newHead = new SnakeNode
{
Row = GetNewHeadRow(_head.Row),
Col = GetNewHeadCol(_head.Col),
Prev = _head,
Symbol = GetSnakeHeadAccordingToDirection()
};
_head.Symbol = Constants.SNAKE_BODY;
_head.Next = newHead;
_head = newHead;
}
public void Move(Direction newDirection)
{
if (!IsNewDirectionValid(newDirection))
{
newDirection = _currentDirection;
}
_currentDirection = newDirection;
SnakeNode newTail = _tail.Next;
newTail.Prev = null;
_tail = newTail;
GrowNewHead();
}
