So I’m working On a Tower Defense Game, the original version of this was implemented by pure Blueprint. However, here comes the problem.
In the original version, I have some waypoints to tell the Enemy where to go like this
every waypoint stored a pointer that contained the next waypoint to go
once the Enemy reached a waypoint it will automatically go to the next waypoint, in Blueprint I do this thing this way
but in C++ I don’t know how to use “AIMoveTo”, I can only use MoveToActor or MoveToLocation and so on like this
CPP
if (EnemyAIController)
{
if(NextPosition)
{
do
{
EnemyAIController->MoveToActor(NextPosition, 5.0f, false);
NextPosition = NextPosition->NextPosition;
} while (NextPosition);
}
}
But the problem is that after the EnemyAIController->MoveToActor(NextPosition, 5.0f, false); executed, the Enemy is still on the way to First Waypoint, but the NextPosition = NextPosition->NextPosition; even the entire do-while loop has already been executed, so the Enemy just walk directly to the last waypoint instead of one by one. So I wonder if there is any way to do this in C++ as I did in Blueprint?
This will execute continuously as if you’re executing from the normal pin of
You’d want to either find a way to have a delegate that will get called when your AI reaches it’s destination, possibly not using do-while.
2 Likes
Ok, so after another search, I found a function in AAIController named OnMoveCompleted, all I need to do is to create a class that inherited from AAIController and override this function like this
void AEnemyAIController::OnMoveCompleted(FAIRequestID RequestID, const FPathFollowingResult& Result)
{
Super::OnMoveCompleted(RequestID, Result);
Enemy = Cast<AEnemy>(GetPawn());
if(Enemy)
{
if (Enemy->NextPosition->NextPosition)
{
Enemy->NextPosition = Enemy->NextPosition->NextPosition;
Enemy->Move();
}
}
}
and this is my AEnemy::Move() function
void AEnemy::Move()
{
if (StartPosition)
{
NextPosition = StartPosition->FirstPosition;
StartPosition = nullptr;
GetWorldTimerManager().ClearTimer(WaitForStartTimerHandle);
}
if (EnemyAIController)
{
if (NextPosition)
{
EnemyAIController->MoveToActor(NextPosition, 5.0f, false);
}
}
}
After the first time I call EnemyAIController->MoveToActor(NextPosition, 5.0f, false); the OnMoveCompleted will automatically be called After the move completed, which behaves exactly like that Blueprint version.
