int GetTileForTail(SnakeBodyPart newTail)
{
if (newTail.CurrentTile > 4)
{
return(newTail.PreviousDirection + 8);
}
return(newTail.CurrentTile + 8);
}
internal void Move(Vector2 newPosition, int previousHeadDirection)
{
SnakeBodyPart newFirstPart = bodyParts.Last();
SnakeBodyPart newTail = newFirstPart.Next;
newFirstPart.Position = newPosition;
newFirstPart.PreviousDirection = HeadDirection;
newFirstPart.CurrentTile = GetTileForFirstBodyPart(previousHeadDirection);
newTail.CurrentTile = GetTileForTail(newTail);
bodyParts.Insert(0, newFirstPart);
bodyParts.RemoveAt(Length);
}
internal void Grow(Vector2 newPosition, int previousHeadDirection)
{
SnakeBodyPart firstPart = bodyParts.First();
SnakeBodyPart tail = bodyParts.Last();
SnakeBodyPart newPart = new SnakeBodyPart(snakeBodySprite)
{
Position = newPosition,
CurrentTile = GetTileForFirstBodyPart(previousHeadDirection),
PreviousDirection = HeadDirection,
Next = tail
};
firstPart.Next = newPart;
bodyParts.Insert(0, newPart);
}