He says it is difficult to get certain components from something that doesn’t have a direct relation. I used the grabber mechanics for an action so an other opens. Though I don’t use a pressure plate or something like that for that door but just the key.
// Fill out your copyright notice in the Description page of Project Settings.
#include "OpenJailDoor.h"
// Sets default values for this component's properties
UOpenJailDoor::UOpenJailDoor()
{
// Set this component to be initialized when the game starts, and to be ticked every frame. You can turn these features
// off to improve performance if you don't need them.
PrimaryComponentTick.bCanEverTick = true;
// ...
}
// Called when the game starts
void UOpenJailDoor::BeginPlay()
{
Super::BeginPlay();
PitchOGValue = GetOwner()->GetActorRotation().Pitch;
YawOGValue = GetOwner()->GetActorRotation().Yaw;
RollOGValue = GetOwner()->GetActorRotation().Roll;
PitchNEWValue = PitchOGValue;
YawNEWValue = YawOGValue - YawTarget;
RollNEWValue = RollOGValue;
ActorThatOpens = GetWorld()->GetFirstPlayerController()->GetPawn();
FindPhysicsHandle();
SetupInputComponent();
// ...
}
void UOpenJailDoor::FindPhysicsHandle()
{
PhysicsHandle = GetWorld()->GetFirstPlayerController()->GetPawn()->FindComponentByClass<UPhysicsHandleComponent>();
if (!PhysicsHandle)
{
UE_LOG(LogTemp, Error, TEXT("No PhysicsHandleComponent Found On: %s"), *GetWorld()->GetFirstPlayerController()->GetPawn()->GetName());
}
else
{
UE_LOG(LogTemp, Warning, TEXT("PhysicsHandleComponent Found On: %s"), *GetWorld()->GetFirstPlayerController()->GetPawn()->GetName());
}
}
void UOpenJailDoor::SetupInputComponent()
{
InputComponent = GetWorld()->GetFirstPlayerController()->GetPawn()->FindComponentByClass<UInputComponent>();
if (!InputComponent)
{
UE_LOG(LogTemp, Error, TEXT("No InputComponent Found On: %s"), *GetWorld()->GetFirstPlayerController()->GetPawn()->GetName());
}
else
{
UE_LOG(LogTemp, Warning, TEXT("InputComponent Found On: %s"), *GetWorld()->GetFirstPlayerController()->GetPawn()->GetName());
InputComponent->BindAction("Grab", IE_Pressed, this, &UOpenJailDoor::Grab);
}
}
void UOpenJailDoor::Grab()
{
FHitResult HitResult = GetFirstPhysicsBodyInReach();
AActor* ActorHit = HitResult.GetActor();
UE_LOG(LogTemp, Warning, TEXT("Grabber Pressed"));
if (ActorHit)
{
OpenGate = true;
}
else
{
OpenGate = false;
}
// ...
}
void UOpenJailDoor::GrabReleased()
{
if (!PhysicsHandle)
{
return;
}
else
{
OpenGate = false;
UE_LOG(LogTemp, Warning, TEXT("Grabber Released"));
}
// ...
}
// Called every frame
void UOpenJailDoor::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
Super::TickComponent(DeltaTime, TickType, ThisTickFunction);
if (OpenGate == true)
{
OpenDoor(DeltaTime);
DoorLastOpened = GetWorld()->GetTimeSeconds();
}
else
{
if (GetWorld()->GetTimeSeconds() - DoorLastOpened > DoorCloseDelay)
{
CloseDoor(DeltaTime);
}
else
{
}
}
// ...
}
void UOpenJailDoor::OpenDoor(float DeltaTime)
{
FHitResult HitResult = GetFirstPhysicsBodyInReach();
AActor* ActorHit = HitResult.GetActor();
UE_LOG(LogTemp, Warning, TEXT("Open Door"));
if (ActorHit)
{
OpenGate = false;
}
else
{
float const CurrentYaw = GetOwner()->GetActorRotation().Yaw;
FRotator OpenDoor(0.0f, YawNEWValue, 0.0f);
OpenDoor.Yaw = FMath::FInterpTo(CurrentYaw, YawNEWValue, DeltaTime, DoorOpenSpeed * DeltaTime);
GetOwner()->SetActorRotation(OpenDoor);
}
// ...
}
void UOpenJailDoor::CloseDoor(float DeltaTime) const
{
float const CurrentYaw = GetOwner()->GetActorRotation().Yaw;
FRotator OpenDoor(0.0f, YawOGValue, 0.0f);
OpenDoor.Yaw = FMath::FInterpTo(CurrentYaw, YawOGValue, DeltaTime, DoorCloseSpeed * DeltaTime);
GetOwner()->SetActorRotation(OpenDoor);
// ...
}
FHitResult UOpenJailDoor::GetFirstPhysicsBodyInReach() const
{
FHitResult Hit;
FCollisionQueryParams TraceParams(FName(TEXT("")), false, GetOwner());
// Ray-cast
GetWorld()->LineTraceSingleByObjectType
(
OUT Hit,
GetPlayersPosition(),
GetPlayersReach(),
FCollisionObjectQueryParams(ECollisionChannel::ECC_PhysicsBody),
TraceParams
);
AActor* ActorHit = Hit.GetActor();
if (ActorHit)
{
UE_LOG(LogTemp, Error, TEXT("Linetrace has hit: %s"), *(ActorHit->GetName()));
}
return Hit;
}
FVector UOpenJailDoor::GetPlayersReach() const
{
FVector PlayerViewPointLocation;
FRotator PlayerViewPointRotation;
GetWorld()->GetFirstPlayerController()->GetPlayerViewPoint(OUT PlayerViewPointLocation, OUT PlayerViewPointRotation);
return PlayerViewPointLocation + PlayerViewPointRotation.Vector() * Reach;
}
FVector UOpenJailDoor::GetPlayersPosition() const
{
FVector PlayerViewPointLocation;
FRotator PlayerViewPointRotation;
GetWorld()->GetFirstPlayerController()->GetPlayerViewPoint(OUT PlayerViewPointLocation, OUT PlayerViewPointRotation);
return PlayerViewPointLocation;
}
