///<summary>Moves the nodes of the snake for one turn, with animation if necessary.
/// Returns the game coordinates of the space just vacated (where the tail was before the move).</summary>
public int[] move(float timeToMove, bool shouldMoveSmoothly)
{
int[] old = this.tail.getCoordinates();
SnakeNode newTail = this.tail.getNodeBefore();
SnakeNode newHead = this.tail; // the tail moves up to become the head
this.ghostNode.goToCoordinates(this.tail.getCoordinates());
newHead.goToCoordinates(this.head.getCoordinates());
// slide ghostNode into the tail and newHead out of the current head to animate the snake's movement
this.ghostNode.StartCoroutine(this.ghostNode.moveToCoordinates(newTail.getCoordinates(), timeToMove, shouldMoveSmoothly));
newHead.StartCoroutine(newHead.moveToCoordinates(this.head.coordinatesOfNextNode(), timeToMove, shouldMoveSmoothly));
newHead.setDirection(this.head.getDirection());
// point to the new head and tail
this.head.setNodeBefore(newHead);
newHead.setNodeBefore(null);
this.tail = newTail;
this.head = newHead;
return(old);
}
