C++ UPrimitiveComponent类代码示例

FGlobalComponentReregisterContext::FGlobalComponentReregisterContext(const TArray<AActor*>& InParentActors)
{
	ActiveGlobalReregisterContextCount++;

	// wait until resources are released
	FlushRenderingCommands();

	// Detach only actor components that are children of the actors list provided
	for(TObjectIterator<UActorComponent> ComponentIt;ComponentIt;++ComponentIt)
	{
		bool bShouldReregister=false;
		UPrimitiveComponent* PrimitiveComponent = Cast<UPrimitiveComponent>(*ComponentIt);
		if (PrimitiveComponent && PrimitiveComponent->ReplacementPrimitive.Get())
		{
			UPrimitiveComponent* ReplacementPrimitive = PrimitiveComponent->ReplacementPrimitive.Get();
			AActor* ParentActor = Cast<AActor>(ReplacementPrimitive->GetOuter());
			if (ParentActor && InParentActors.Contains(ParentActor))
			{
				bShouldReregister = true;
			}
		}
		if( bShouldReregister )
		{
			new(ComponentContexts) FComponentReregisterContext(*ComponentIt);		
		}
	}
}

void AActor::GatherCurrentMovement()
{
	UPrimitiveComponent* RootPrimComp = Cast<UPrimitiveComponent>(GetRootComponent());
	if (RootPrimComp && RootPrimComp->IsSimulatingPhysics())
	{
		FRigidBodyState RBState;
		RootPrimComp->GetRigidBodyState(RBState);

		ReplicatedMovement.FillFrom(RBState);
	}
	else if(RootComponent != NULL)
	{
		// If we are attached, don't replicate absolute position
		if( RootComponent->AttachParent != NULL )
		{
			// Networking for attachments assumes the RootComponent of the AttachParent actor. 
			// If that's not the case, we can't update this, as the client wouldn't be able to resolve the Component and would detach as a result.
			if( AttachmentReplication.AttachParent != NULL )
			{
				AttachmentReplication.LocationOffset = RootComponent->RelativeLocation;
				AttachmentReplication.RotationOffset = RootComponent->RelativeRotation;
				AttachmentReplication.RelativeScale3D = RootComponent->RelativeScale3D;
			}
		}
		else
		{
			ReplicatedMovement.Location = RootComponent->GetComponentLocation();
			ReplicatedMovement.Rotation = RootComponent->GetComponentRotation();
			ReplicatedMovement.LinearVelocity = GetVelocity();
			ReplicatedMovement.bRepPhysics = false;
		}
	}
}

void FBodyInstance2D::TermBody()
{
#if WITH_BOX2D
	UPrimitiveComponent* OwnerComponent = OwnerComponentPtr.Get();
	//@TODO: Handle this - check(OwnerComponent);
	if (OwnerComponent == NULL)
	{
		return;
	}

	if (BodyInstancePtr != NULL)
	{
		if (b2World* World = FPhysicsIntegration2D::FindAssociatedWorld(OwnerComponent->GetWorld()))
		{
			World->DestroyBody(BodyInstancePtr);
		}
		else
		{
			BodyInstancePtr->SetUserData(NULL);
		}

		BodyInstancePtr = NULL;
	}
#endif
}

void UUnrealEdEngine::SetActorSelectionFlags (AActor* InActor)
{
	TInlineComponentArray<UActorComponent*> Components;
	InActor->GetComponents(Components);

	//for every component in the actor
	for(int32 ComponentIndex = 0; ComponentIndex < Components.Num(); ComponentIndex++)
	{
		UActorComponent* Component = Components[ComponentIndex];
		if (Component->IsRegistered())
		{
			// If we have a 'child actor' component, want to update its visible selection state
			UChildActorComponent* ChildActorComponent = Cast<UChildActorComponent>(Component);
			if(ChildActorComponent != NULL && ChildActorComponent->ChildActor != NULL)
			{
				SetActorSelectionFlags(ChildActorComponent->ChildActor);
			}

			UPrimitiveComponent* PrimComponent = Cast<UPrimitiveComponent>(Component);
			if(PrimComponent != NULL && PrimComponent->IsRegistered())
			{
				PrimComponent->PushSelectionToProxy();
			}

			UDecalComponent* DecalComponent = Cast<UDecalComponent>(Component);
			if(DecalComponent != NULL)// && DecalComponent->IsRegistered())
			{
				DecalComponent->PushSelectionToProxy();
			}
		}
	}
}

void ACinemotusPlayerController::AbsoluteTick(float DeltaTime)
{

	
	TotalYawAbs += addYaw;
	UPrimitiveComponent* prim = GetPawn()->GetMovementComponent()->UpdatedComponent;
	//USceneComponent* sComponent = GetPawn()->GetRootComponent();
	//sComponent->SetRelativeLocation;

	bool SetPrimDirectly = true;
	FQuat finalQuat;

	if (((currentCaptureState&ECinemotusCaptureState::EAbsolute) == ECinemotusCaptureState::EAbsolute) && 
		((currentCaptureState&ECinemotusCaptureState::EAbsoluteOff) == 0))
	{
		finalQuat = FRotator(0, TotalYawAbs, 0).Quaternion()*(HydraLatestData->controllers[CAM_HAND].quat);
	}
	else
	{
		finalQuat =  FRotator(0, addYaw, 0).Quaternion()*prim->GetComponentQuat();
	}
	SetControlRotation(finalQuat.Rotator());
	if (SetPrimDirectly && prim)
	{
		prim->SetWorldLocationAndRotation(prim->GetComponentLocation(), finalQuat);// not sure need
	}


	HandleMovementAbs(DeltaTime, ((currentCaptureState&ECinemotusCaptureState::EAbsolute) == ECinemotusCaptureState::EAbsolute));
}

void UBuoyancyForceComponent::InitializeComponent()
{
	Super::InitializeComponent();

	//UE_LOG(LogTemp, Warning, TEXT("We're initializing..."));

	//Store the world ref.
	World = GetWorld();

	// If no OceanManager is defined, auto-detect
	if (!OceanManager)
	{
		for (TActorIterator<AOceanManager> ActorItr(World); ActorItr; ++ActorItr)
		{
			OceanManager = Cast<AOceanManager>(*ActorItr);
			break;
		}
	}

	TestPointRadius = FMath::Abs(TestPointRadius);

	UPrimitiveComponent* BasePrimComp = Cast<UPrimitiveComponent>(GetAttachParent());
	if (BasePrimComp)
	{
		ApplyUprightConstraint(BasePrimComp);

		//Store the initial damping values.
		_baseLinearDamping = BasePrimComp->GetLinearDamping();
		_baseAngularDamping = BasePrimComp->GetAngularDamping();
	}
}

FText FPrimitiveComponentDetails::OnGetBodyMass() const
{
	UPrimitiveComponent* Comp = NULL;

	float Mass = 0.0f;
	bool bMultipleValue = false;

	for (auto ObjectIt = ObjectsCustomized.CreateConstIterator(); ObjectIt; ++ObjectIt)
	{
		if(ObjectIt->IsValid() && (*ObjectIt)->IsA(UPrimitiveComponent::StaticClass()))
		{
			Comp = Cast<UPrimitiveComponent>(ObjectIt->Get());

			float CompMass = Comp->CalculateMass();
			if (Mass == 0.0f || FMath::Abs(Mass - CompMass) < 0.1f)
			{
				Mass = CompMass;
			}
			else
			{
				bMultipleValue = true;
				break;
			}
		}
	}

	if (bMultipleValue)
	{
		return LOCTEXT("MultipleValues", "Multiple Values");
	}

	return FText::AsNumber(Mass);
}

/** This occurs when play begins */
void AMagicBattleSoccerBall::BeginPlay()
{
    Super::BeginPlay();

    if (Role < ROLE_Authority)
    {
        // The server manages the game state; the soccer ball will be replicated to us.

        // Physics however are not replicated. We will need to have the ball orientation
        // replicated to us. We need to turn off physics simulation and collision detection.
        UPrimitiveComponent *Root = Cast<UPrimitiveComponent>(GetRootComponent());
        Root->PutRigidBodyToSleep();
        Root->SetSimulatePhysics(false);
        Root->SetEnableGravity(false);
        SetActorEnableCollision(false);
    }
    else
    {
        // Servers should add this soccer ball to the game mode cache.
        // It will get replicated to clients for when they need to access
        // the ball itself to get information such as who possesses it.
        AMagicBattleSoccerGameState* GameState = GetGameState();
        GameState->SoccerBall = this;
    }
}

bool UPrimitiveComponent::WeldToImplementation(USceneComponent * InParent, FName ParentSocketName /* = Name_None */, bool bWeldSimulatedChild /* = false */)
{
	//WeldToInternal assumes attachment is already done
	if (AttachParent != InParent || AttachSocketName != ParentSocketName)
	{
		return false;
	}

	//Check that we can actually our own socket name
	FBodyInstance* BI = GetBodyInstance(NAME_None, false);
	if (BI == NULL)
	{
		return false;
	}

	if (BI->ShouldInstanceSimulatingPhysics() && bWeldSimulatedChild == false)
	{
		return false;
	}

	UnWeldFromParent();	//make sure to unweld from wherever we currently are

	FName SocketName;
	UPrimitiveComponent * RootComponent = GetRootWelded(this, ParentSocketName, &SocketName, true);

	if (RootComponent)
	{
		if (FBodyInstance* RootBI = RootComponent->GetBodyInstance(SocketName, false))
		{
			if (BI->WeldParent == RootBI)	//already welded so stop
			{
				return true;
			}

			BI->bWelded = true;
			//There are multiple cases to handle:
			//Root is kinematic, simulated
			//Child is kinematic, simulated
			//Child always inherits from root

			//if root is kinematic simply set child to be kinematic and we're done
			if (RootComponent->IsSimulatingPhysics(SocketName) == false)
			{
				BI->WeldParent = NULL;
				SetSimulatePhysics(false);
				return false;	//return false because we need to continue with regular body initialization
			}

			//root is simulated so we actually weld the body
			FTransform RelativeTM = RootComponent == AttachParent ? GetRelativeTransform() : GetComponentToWorld().GetRelativeTransform(RootComponent->GetComponentToWorld());	//if direct parent we already have relative. Otherwise compute it
			RootBI->Weld(BI, GetComponentToWorld());
			BI->WeldParent = RootBI;

			return true;
		}
	}

	return false;
}

void APawn::MoveIgnoreActorRemove(AActor* ActorToIgnore)
{
	UPrimitiveComponent* RootPrimitiveComponent = Cast<UPrimitiveComponent>(GetRootComponent());
	if( RootPrimitiveComponent )
	{
		RootPrimitiveComponent->IgnoreActorWhenMoving(ActorToIgnore, false);
	}
}

void FLayers::RemoveViewFromActorViewVisibility( FLevelEditorViewportClient* ViewportClient )
{
	const int32 ViewIndex = ViewportClient->ViewIndex;

	// get the bit for the view index
	uint64 ViewBit = ((uint64)1 << ViewIndex);
	// get all bits under that that we want to keep
	uint64 KeepBits = ViewBit - 1;

	// Iterate over all actors, looking for actors in the specified layers.
	for( FActorIterator It(ViewportClient->GetWorld()) ; It ; ++It )
	{
		const TWeakObjectPtr< AActor > Actor = *It;

		if( !IsActorValidForLayer( Actor ) )
		{
			continue;
		}

		// remember original bits
		uint64 OriginalHiddenViews = Actor->HiddenEditorViews;

		uint64 Was = Actor->HiddenEditorViews;

		// slide all bits higher than ViewIndex down one since the view is being removed from Editor
		uint64 LowBits = Actor->HiddenEditorViews & KeepBits;

		// now slide the top bits down by ViewIndex + 1 (chopping off ViewBit)
		uint64 HighBits = Actor->HiddenEditorViews >> (ViewIndex + 1);
		// then slide back up by ViewIndex, which will now have erased ViewBit, as well as leaving 0 in the low bits
		HighBits = HighBits << ViewIndex;

		// put it all back together
		Actor->HiddenEditorViews = LowBits | HighBits;

		// reregister if we changed the visibility bits, as the rendering thread needs them
		if (OriginalHiddenViews == Actor->HiddenEditorViews)
		{
			continue;
		}

		// Find all registered primitive components and update the scene proxy with the actors updated visibility map
		TInlineComponentArray<UPrimitiveComponent*> Components;
		Actor->GetComponents(Components);

		for( int32 ComponentIdx = 0; ComponentIdx < Components.Num(); ++ComponentIdx )
		{
			UPrimitiveComponent* PrimitiveComponent = Components[ComponentIdx];
			if (PrimitiveComponent->IsRegistered())
			{
				// Push visibility to the render thread
				PrimitiveComponent->PushEditorVisibilityToProxy( Actor->HiddenEditorViews );
			}
		}
	}
}

void ABomb::OnConstruction(const FTransform &Transform)
{
	UPrimitiveComponent *pc = Cast<UPrimitiveComponent>(GetComponent(RootComponent, "BombMesh"));

	if (pc)
	{
		BombMIB = pc->CreateDynamicMaterialInstance(0, NULL);
		SetBombColor(FLinearColor::Black);
	}
}

UMaterialInterface* FComponentMaterialTrackEditor::GetMaterialInterfaceForTrack( FGuid ObjectBinding, UMovieSceneMaterialTrack* MaterialTrack )
{
	UObject* ComponentObject = GetSequencer()->GetFocusedMovieSceneSequence()->FindObject( ObjectBinding );
	UPrimitiveComponent* Component = Cast<UPrimitiveComponent>( ComponentObject );
	UMovieSceneComponentMaterialTrack* ComponentMaterialTrack = Cast<UMovieSceneComponentMaterialTrack>( MaterialTrack );
	if ( Component != nullptr && ComponentMaterialTrack != nullptr )
	{
		return Component->GetMaterial( ComponentMaterialTrack->GetMaterialIndex() );
	}
	return nullptr;
}

void AMagicBattleSoccerBall::Tick(float DeltaSeconds)
{
    Super::Tick(DeltaSeconds);

    if (nullptr != Possessor)
    {
        // If the ball is possessed by a player, then the ball should move as a function
        // of the possessor
        MoveWithPossessor();
    }
    else
    {
        // No possessor. The ball is freely moving.
        if (Role < ROLE_Authority)
        {
            // Clients should update its local position based on where it is on the server
            ClientSimulateFreeMovingBall();
        }
        else
        {
            // Update the charging value
            if (GetVelocity().SizeSquared() > 1.f)
            {
                IsCharging = false;
            }

            // Servers should simulate the ball physics freely and replicate the orientation
            UPrimitiveComponent *Root = Cast<UPrimitiveComponent>(GetRootComponent());
            ServerPhysicsState.pos = GetActorLocation();
            ServerPhysicsState.rot = GetActorRotation();
            ServerPhysicsState.vel = Root->GetComponentVelocity();
            ServerPhysicsState.timestamp = AMagicBattleSoccerPlayerController::GetLocalTime();

            // Servers should also test the distance from the old possessor and reset it
            if (nullptr != PossessorToIgnore)
            {
                if (!PossessorToIgnore->IsAlive())
                {
                    PossessorToIgnore = nullptr;
                }
                else
                {
                    FVector2D PossessorLoc(PossessorToIgnore->GetActorLocation());
                    FVector2D BallLoc(GetActorLocation());
                    float d = FVector2D::DistSquared(PossessorLoc, BallLoc);
                    if (d > 14000)
                    {
                        PossessorToIgnore = nullptr;
                    }
                }
            }
        }
    }
}

void AFP_FirstPersonCharacter::OnFire()
{
	// Play a sound if there is one
	if (FireSound != NULL)
	{
		UGameplayStatics::PlaySoundAtLocation(this, FireSound, GetActorLocation());
	}

	// try and play a firing animation if specified
	if(FireAnimation != NULL)
	{
		// Get the animation object for the arms mesh
		UAnimInstance* AnimInstance = Mesh1P->GetAnimInstance();
		if(AnimInstance != NULL)
		{
			AnimInstance->Montage_Play(FireAnimation, 1.f);
		}
	}

	// Now send a trace from the end of our gun to see if we should hit anything
	APlayerController* PlayerController = Cast<APlayerController>(GetController());
	
	// Calculate the direction of fire and the start location for trace
	FVector CamLoc;
	FRotator CamRot;
	PlayerController->GetPlayerViewPoint(CamLoc, CamRot);
	const FVector ShootDir = CamRot.Vector();

	FVector StartTrace = FVector::ZeroVector;
	if (PlayerController)
	{
		FRotator UnusedRot;
		PlayerController->GetPlayerViewPoint(StartTrace, UnusedRot);

		// Adjust trace so there is nothing blocking the ray between the camera and the pawn, and calculate distance from adjusted start
		StartTrace = StartTrace + ShootDir * ((GetActorLocation() - StartTrace) | ShootDir);
	}

	// Calculate endpoint of trace
	const FVector EndTrace = StartTrace + ShootDir * WeaponRange;

	// Check for impact
	const FHitResult Impact = WeaponTrace(StartTrace, EndTrace);

	// Deal with impact
	AActor* DamagedActor = Impact.GetActor();
	UPrimitiveComponent* DamagedComponent = Impact.GetComponent();

	// If we hit an actor, with a component that is simulating physics, apply an impulse
	if ((DamagedActor != NULL) && (DamagedActor != this) && (DamagedComponent != NULL) && DamagedComponent->IsSimulatingPhysics())
	{
		DamagedComponent->AddImpulseAtLocation(ShootDir*WeaponDamage, Impact.Location);
	}
}