// Use this for initialization
void Start()
{
goal = GameObject.CreatePrimitive(PrimitiveType.Sphere);
level = FindObjectOfType <SnakeLevel>();
goal.transform.position = startPosition;
snakeBodySegments = new List <GameObject>();
snakeBodySegmentDirections = new List <Direction>();
stopGame = false;
GameObject head = Instantiate(snakeBodyPrefab);
head.transform.position = goal.transform.position;
level.BlockNode(new Vector2(head.transform.position.x, head.transform.position.z));
snakeBodySegments.Add(head);
snakeBodySegmentDirections.Add(Direction.NONE);
pathIndex = 0;
waitTimeCounter = 0.0f;
score = 0;
iterationCount = 0;
cumulativeScore = 0;
}
// Update is called once per frame
void Update()
{
if (!stopGame)
{
if (waitTimeCounter > waitTime)
{
waitTimeCounter = 0.0f;
if (snakeBodySegments[0].transform.position == goal.transform.position)
{
scoreText.text = "Score: " + score;
score++;
//Spawn new segment
{
GameObject segment = Instantiate(snakeBodyPrefab);
Vector3 segmentPosition;
Vector3 lastSegmentPosition = snakeBodySegments[snakeBodySegments.Count - 1].transform.position;
Direction lastSegmentDirection = snakeBodySegmentDirections[snakeBodySegmentDirections.Count - 1];
segmentPosition = lastSegmentPosition;
switch (lastSegmentDirection)
{
case Direction.UP:
segmentPosition.z -= 1;
break;
case Direction.DOWN:
segmentPosition.z += 1;
break;
case Direction.LEFT:
segmentPosition.x += 1;
break;
case Direction.RIGHT:
default:
segmentPosition.x -= 1;
break;
}
segment.transform.position = segmentPosition;
level.BlockNode(new Vector2(segmentPosition.x, segmentPosition.z));
snakeBodySegments.Add(segment);
snakeBodySegmentDirections.Add(Direction.NONE);
}
//Find random goal
{
int x = UnityEngine.Random.Range(-16, 16);
int y = UnityEngine.Random.Range(-16, 16);
Vector2 goalPosition = new Vector2(x, y);
while (level.IsTileBlocked(goalPosition))
{
x = UnityEngine.Random.Range(-16, 16);
y = UnityEngine.Random.Range(-16, 16);
goalPosition.x = x;
goalPosition.y = y;
}
Vector2 start = new Vector2(snakeBodySegments[0].transform.position.x, snakeBodySegments[0].transform.position.z);
goal.transform.position = new Vector3(goalPosition.x, 1.0f, goalPosition.y);
//Find path
path = level.GetShortestPath(start, goalPosition);
pathIndex = 0;
if (path.Count == 0 && useSpecialPathFinding)
{
//Find any open direction to move in
Vector3 headPosition = snakeBodySegments[0].transform.position;
}
}
}
else if (path.Count > 0)
{
for (int i = 0; i < snakeBodySegments.Count; i++)
{
//Get current segment
GameObject segment = snakeBodySegments[i];
//Unblock the node it is on
level.UnBlockNode(new Vector2(segment.transform.position.x, segment.transform.position.z));
//Get its current position
Vector3 currentPosition = segment.transform.position;
//Find out the next position
Vector3 nextPosition;
if (i == 0)
{
nextPosition = new Vector3(path[pathIndex].x, 1.0f, path[pathIndex].z);
}
else
{
nextPosition = snakeBodySegments[i - 1].transform.position + GetPreviousPositionOffset(snakeBodySegmentDirections[i - 1]);
}
//Find out the direction
Direction movementDirection;
Vector3 positionDifference = nextPosition - currentPosition;
Debug.Assert(positionDifference.magnitude == 1);
if (positionDifference.x == 1)
{
movementDirection = Direction.RIGHT;
}
else if (positionDifference.x == -1)
{
movementDirection = Direction.LEFT;
}
else if (positionDifference.z == 1)
{
movementDirection = Direction.UP;
}
else
{
movementDirection = Direction.DOWN;
}
//Update position
segment.transform.position = nextPosition;
//Update direction
snakeBodySegmentDirections[i] = movementDirection;
//Block the new node
level.BlockNode(new Vector2(nextPosition.x, nextPosition.z));
}
pathIndex++;
if (pathFindEachFrame)
{
Vector2 start = new Vector2(snakeBodySegments[0].transform.position.x, snakeBodySegments[0].transform.position.z);
Vector2 goalPosition = new Vector2(goal.transform.position.x, goal.transform.position.z);
path = level.GetShortestPath(start, goalPosition);
pathIndex = 0;
}
}
else
{
bool specialPathFound = false;
if (useSpecialPathFinding)
{
specialPathFound = PerformSpecialPathFinding(specialPathFound);
}
if (!specialPathFound)
{
iterationCount++;
if (iterationCount >= maxIterations)
{
//end game
print("end");
print(cumulativeScore / maxIterations);
stopGame = true;
}
else
{
//Reset game
for (int i = 1; i < snakeBodySegments.Count; i++)
{
Destroy(snakeBodySegments[i]);
}
GameObject head = snakeBodySegments[0];
head.transform.position = startPosition;
snakeBodySegments.Clear();
snakeBodySegments.Add(head);
goal.transform.position = startPosition;
snakeBodySegmentDirections.Clear();
snakeBodySegmentDirections.Add(Direction.NONE);
//Unblock all tiles
level.UnblockAll();
level.BlockNode(new Vector2(head.transform.position.x, head.transform.position.z));
cumulativeScore += score;
score = 0;
}
}
}
}
else
{
waitTimeCounter += Time.deltaTime;
}
}
}
