How to stop the door rotation at 90 degree

Development Programming & Scripting C++
,
1

When I start playing I want the player interact with key E and the gate rotate to 90 degree.

I did the FRotator but it keep rotating endlessly.

How to stop the rotation at 90 degree?
/*****************************************************************/
// Called every frame
void UNigtDegree_Door::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction ThisTickFunction)
{
Super::TickComponent(DeltaTime, TickType, ThisTickFunction);

RotatePlatform(DeltaTime);
// ...

}
void UNigtDegree_Door::RotatePlatform(float DeltaTime)
{

GetOwner()->AddActorLocalRotation(RotaionDoorVelosity *DeltaTime);

}

/*********************************************************************************************/
.h file
private:

UPROPERTY(EditAnywhere, Category ="Rotation")
FRotator RotaionDoorVelosity;              // =FRotator(0,0,90); 

 void RotatePlatform(float DeltaTime);

};

It will be appreciate if some one can help me with this regards.

2

Hello, if you want to stop the rotation you could count how much you rotated using the DeltaTime.

.cpp file

void UNigtDegree_Door::RotatePlatform(float DeltaTime)
{
   if (RotationAmount < 1)
   {
      GetOwner()->AddActorLocalRotation(FRotator(0, 0, 90) * DeltaTime);
      RotationAmount += DeltaTime;
   }
}

.h file

void RotatePlatform(float DeltaTime);
float RotationAmount = 0;

When the value of RotationAmount get to 1, means that the added rotation is equal to FRotator(0, 0, 90).
I hope this is useful.

3

Look into using the FMath::Interp functions. You can control the exact time it takes and the rotations will always be precise. It will also keep everyone working on the project sane. :smile:

FMath::InterpEaseInOut | Unreal Engine Documentation

4

Thank you so much.

5

I dont know exactly how to read Unreal Engine Documentation. I have used to program games without engine but I was creating functions which dont exists. Can you plase advice me how to get familiar with Unreal Engine Documentation?
For example GetOwner(); In my game there was nothing display/ or moved until I saw it Youtube, you need to point to the address of the Actor. In fact they didnt say it that way. That was from my humble search after I saw them using that function.

How I can know which function is to which ( Character , Pawn , Actor , Actor Component , Scene Component, etc ?

Can you tell me please? Thank you for your support.

6

Some quick tips that have helped me with the docs:

  • Hierarchy is very important. Link for example.
    image
    Knowing what every class can and cannot do will save you a lot of time researching how to achieve stuff. You can skim through the classes by searching for them in the content browser:
    image
    image589×532 51.7 KB
  • Give this a read: Coding Standard | Unreal Engine Documentation , specially attention to Naming Conventions to help navigate the classes.
  • Make a habit of diving into .h file and follow the chain up:
    image
    image1423×399 78.1 KB
  • Don’t forget to ctrl + f when going throught the classes.

Hope it helps.

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