private void ChangeSnakeDirection(bool pressedRight)
{
Vector3 currentDirection = snakeScript.GetDirection();
Vector3 newDirection;
// Assume pressed right,
// move right from snake's perspective (clockwise)
if (currentDirection.Equals(Vector3.forward))
{
newDirection = Vector3.right;
}
else if (currentDirection.Equals(Vector3.right))
{
newDirection = Vector3.back;
}
else if (currentDirection.Equals(Vector3.back))
{
newDirection = Vector3.left;
}
else
{
// currentDirection is left
newDirection = Vector3.forward;
}
if (!pressedRight)
{
// Move left from snake's perspective (clockwise),
// opposite direction of the same axis compared to
// moving right
newDirection *= -1;
}
snakeScript.SetNextStepDirection(newDirection);
}
void Update()
{
if (Input.touchCount <= 0)
{
// Not touching screen
return;
}
Touch touch = Input.GetTouch(0);
if (touch.phase != TouchPhase.Began)
{
// Only respond at the beginning of a touch
return;
}
Vector3 currentDirection = snakeScript.GetDirection();
Vector3 newDirection;
// Assume pressed right,
// move right from snake's perspective (clockwise)
if (currentDirection.Equals(Vector3.forward))
{
newDirection = Vector3.right;
}
else if (currentDirection.Equals(Vector3.right))
{
newDirection = Vector3.back;
}
else if (currentDirection.Equals(Vector3.back))
{
newDirection = Vector3.left;
}
else
{
// currentDirection is left
newDirection = Vector3.forward;
}
// Determine if left or right side of the screen
// was touched
Vector3 touchPos = touch.position;
if (touchPos.x < Screen.width / 2)
{
// Move left from snake's perspective (clockwise),
// opposite direction of the same axis compared to
// moving right
newDirection *= -1;
}
snakeScript.SetNextStepDirection(newDirection);
}