private void Create()
{
var head = new SnakePart(_initialX, _initialY);
Tail = head;
for (var i = 0; i < _initialLength - 1; i++)
{
var next = new SnakePart(head.X + 1, head.Y);
next.SetConnection(head, -1);
head.SetConnection(next, 1);
head = next;
}
Head = head;
_velocity = new Velocity(0, 0);
}
internal void SetConnection(SnakePart node, SnakeNodeType nodeType = SnakeNodeType.Head)
{
//var deltaX = Math.Abs(X - node.X);
//var deltaY = Math.Abs(Y - node.Y);
//if (deltaX != 1 && deltaY != 1)
// throw new ArgumentException($"{(nodeType == SnakeNodeType.Head ? "Head" : "Tail")} of the snake cannot be the same or be farther from current part more than one cell",nameof(node));
if (nodeType == SnakeNodeType.Head)
{
Head = node;
}
else
{
Tail = node;
}
}
public void Move()
{
if (_velocity.FullStop)
{
return;
}
var newHead = Tail;
Tail = Tail.Head;
Tail.SetConnection(null, -1);
newHead.SetConnection(Head, -1);
newHead.SetConnection(null, 1);
Head.SetConnection(newHead, 1);
Head = newHead;
newHead.CloneXY(newHead.Tail);
newHead.Move(_velocity, _boundWidth, _boundHeight);
if (_isTailOverNewPart)
{
Tail.SetConnection(_nextPartToAdd, -1);
_nextPartToAdd.SetConnection(Tail, 1);
Tail = _nextPartToAdd;
_nextPartToAdd = null;
_isTailOverNewPart = false;
}
if (_nextPartToAdd == null && _partsToAdd.Count > 0)
{
_nextPartToAdd = _partsToAdd.Dequeue();
}
if (_nextPartToAdd != null && (_nextPartToAdd.X == Tail.X &&
_nextPartToAdd.Y == Tail.Y))
{
_isTailOverNewPart = true;
}
}
public SnakePart(int x, int y, SnakePart head, SnakePart tail) : this(x, y)
{
Head = head;
Tail = tail;
}
public void CloneXY(SnakePart part)
{
X = part.X;
Y = part.Y;
}