public void Move()
{
var toReplace = _tail;
_tail = _tail.Next ?? _head;
switch (_head.Direction)
{
case MoveDirection.Up:
SetXY(toReplace, _head.X, _head.Y - 1);
break;
case MoveDirection.Down:
SetXY(toReplace, _head.X, _head.Y + 1);
break;
case MoveDirection.Left:
SetXY(toReplace, _head.X - 1, _head.Y);
break;
case MoveDirection.Right:
SetXY(toReplace, _head.X + 1, _head.Y);
break;
default:
SetXY(toReplace, _head.X, _head.Y);
break;
}
_head.Next = toReplace.Next == null ? null : toReplace;
toReplace.Direction = _head.Direction;
_head = toReplace;
}
public void Eat()
{
var growthCell = new SnakeCell(_tail);
if (_head.Direction == MoveDirection.Stop || _tail.Direction == MoveDirection.Stop) return;
growthCell = _pushMethods[_tail.Direction](growthCell, _tail);
_body.Add(growthCell);
_tail = growthCell;
}
public Snake(int stX, int stY)
{
_head = new SnakeCell {X = stX, Y = stY};
_tail = _head;
_body.Add(_head);
_head.Direction = MoveDirection.Down;
_tail.Direction = _head.Direction;
}
private void SetXY(SnakeCell cell, int x, int y)
{
cell.X = x;
cell.Y = y;
}
private void MoveXY(SnakeCell cell, int dX, int dY)
{
cell.X += dX;
cell.Y += dY;
}