Make Character Movement tile based.

Development Programming & Scripting C++
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1

I am trying to create ACharacter that should snap to grid positions when moving.

Approach

My conceptual approach is to have an axis event than when trigger I apply add the movement one time forward based on the grid size and then wait for a certain delay and apply the movement again.

If the player would press the forward axis continuously what would happen is the following:
MoveForward(gridsize), Wait(1s), MoveForward(gridsize), Wait(1s), ... etc

I am have written some C++ code to achieve this idea but the problem is that when calling AddMovementInput the player does not move.
The player would move forward everyframe if I would call AddMovementInput without the if condition above.



void AMyCharacter::MoveForward(float AxisValue)
{
	
	if(AxisValue > 0 && GetWorld()->GetTimeSeconds() - currentTime > MovementDelay)
	{      
         // add movement only after a delay has passed.
         // this place of the gets reached correctly but the player does not move
		AddMovementInput(GetActorForwardVector(), AxisValue * MovementSpeed,true);
		currentTime = GetWorld()->GetTimeSeconds();
	}
	if(AxisValue > 0)
	{
		UE_LOG(LogTemp, Warning, TEXT("Axis value %f"), AxisValue);
		UE_LOG(LogTemp, Warning, TEXT("Current Movement Input (%f %f %f)"), ControlInputVector.X, ControlInputVector.Y, ControlInputVector.Z); // (100,0,0) one time and the rest if (0,0,0)
	}
}


void AMyCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{ 
	Super::SetupPlayerInputComponent(PlayerInputComponent);
        // bind forward axis
	PlayerInputComponent->BindAxis("Move Forward / Backward", this, &AMyCharacter::MoveForward);

}

Problem

Player does not move at all.

For debugging purposes I printed the ControlInputVector and in the log I can see that is (0,0,0) every time except for one print when it is (100,0,0) which is good.

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What have I tried?

  1. I tried setting bForce to true or false with no luck
  2. I tried reading the sourcecode of ACharacter and APawn and I found the function that consumes the input but I did not find the place where the location of the player get’s updated.

Any help would be appreciated.

2

At first glance it looks like “GetWorld()->GetTimeSeconds()” and “currentTime” will always be equal.

Looks like “currentTime” is meant to be a time accumulator and probably every Tick() you should just be incrementing it by DeltaTime. Then when a successful move occurs reset it to zero.

3

CurrentTime is the time when the last move was performed. Initially no moved was performed so the timer CurrentTime is set to 0.
After a time of let’s say 1 second a move can be made and the CurrentTime is updated to 1.