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우리 커스텀 Pawn Movement Component 를 사용하기 위해서는 먼저 그에 대한 기록을 유지할 변수를 Pawn 클래스에 추가해 줘야 합니다.
CollidingPawn.h의 클래스 정의 끝, "OurParticleSystem" 변수를 추가한 곳 근처에 다음과 같이 추가해 줘야 합니다:class UCollidingPawnMovementComponent* OurMovementComponent; -
기록을 유지할 곳이 생겼으면, 새로운 변수를 저장할 Colliding Pawn Movement Component 를 만들어 줘야 하니,
CollidingPawn.cpp를 열고 파일 상단 "GameFramework/Pawn.h" 줄 아래에 다음과 같이 추가하여 코드가 새 클래스를 참조할 수 있도록 합니다:#include "CollidingPawnMovementComponent.h"
목록의 마지막 #include 가 generated.h (#include "CollidingPawn.generated.h" in this case) as it will cause a compile error otherwise.
Pawn Movement Component 를 만들어 우리 Pawn 에 연관시켜 주는 것은 간단합니다. ACollidingPawn::ACollidingPawn 하단에 이렇게 추가해 주면 됩니다:
// 무브먼트 컴포넌트 인스턴스를 생성하고, 루트를 업데이트하라 이릅니다.
OurMovementComponent = CreateDefaultSubobject<UCollidingPawnMovementComponent>(TEXT("CustomMovementComponent"));
OurMovementComponent->UpdatedComponent = RootComponent;
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Pawn 에는 "GetMovementComponent" 라는 함수가 있는데, 엔진의 다른 클래스가 현재 Pawn 이 사용중인 Pawn Movement Component 에 접근할 수 있도록 하는 데 사용됩니다. 이것이 우리 커스텀 Pawn Movement Component 를 반환할 수 있도록 하려면 그 함수를 덮어써 줘야 할 것입니다.
CollidingPawn.h의 클래스 정의에 다음과 같이 추가해 줍니다:virtual UPawnMovementComponent* GetMovementComponent() const override;
그리고 CollidingPawn.cpp 에서, 다음과 같이 덮어쓴 함수의 정의를 추가해 줘야 합니다:
UPawnMovementComponent* ACollidingPawn::GetMovementComponent() const
{
return OurMovementComponent;
}
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새로운 Pawn Movement Component 구성이 완료되었으니, 우리 Pawn 이 받을 입력 처리를 위한 코드를 만들면 되겠습니다.
CollidingPawn.h의 클래스 정의에 함수를 몇 개 선언해 주는 것으로 시작합니다:void MoveForward(float AxisValue); void MoveRight(float AxisValue); void Turn(float AxisValue); void ParticleToggle();
CollidingPawn.cpp 에서 그 함수에 대한 정의를 다음과 같이 추가합니다:
void ACollidingPawn::MoveForward(float AxisValue)
{
if (OurMovementComponent && (OurMovementComponent->UpdatedComponent == RootComponent))
{
OurMovementComponent->AddInputVector(GetActorForwardVector() * AxisValue);
}
}
void ACollidingPawn::MoveRight(float AxisValue)
{
if (OurMovementComponent && (OurMovementComponent->UpdatedComponent == RootComponent))
{
OurMovementComponent->AddInputVector(GetActorRightVector() * AxisValue);
}
}
void ACollidingPawn::Turn(float AxisValue)
{
FRotator NewRotation = GetActorRotation();
NewRotation.Yaw += AxisValue;
SetActorRotation(NewRotation);
}
void ACollidingPawn::ParticleToggle()
{
if (OurParticleSystem && OurParticleSystem->Template)
{
OurParticleSystem->ToggleActive();
}
}
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남은 것은 우리 함수를 입력 이벤트에 묶는 것 뿐입니다. 다음 코드를 ACollidingPawn::SetupPlayerInputComponent 에 추가합시다:
InputComponent->BindAction("ParticleToggle", IE_Pressed, this, &ACollidingPawn::ParticleToggle); InputComponent->BindAxis("MoveForward", this, &ACollidingPawn::MoveForward); InputComponent->BindAxis("MoveRight", this, &ACollidingPawn::MoveRight); InputComponent->BindAxis("Turn", this, &ACollidingPawn::Turn); -
프로그래밍 작업은 다 되었으며, 이제 언리얼 에디터 로 돌아가 컴파일 버튼을 누르고 변경사항을 로드하면 됩니다.
프로그래밍 작업이 완료되었으니, 이제 커스텀 Pawn 을 월드에 배치하고 움직일 수 있습니다.
Finished Code
CollidingPawn.h
// Copyright 1998-2018 Epic Games, Inc. All Rights Reserved.
#pragma once
#include "GameFramework/Pawn.h"
#include "CollidingPawn.generated.h"
UCLASS()
class HOWTO_COMPONENTS_API ACollidingPawn : public APawn
{
GENERATED_BODY()
public:
// Sets default values for this pawn's properties
ACollidingPawn();
protected:
// Called when the game starts or when spawned
virtual void BeginPlay() override;
public:
// Called every frame
virtual void Tick( float DeltaSeconds ) override;
// Called to bind functionality to input
virtual void SetupPlayerInputComponent(class UInputComponent* InputComponent) override;
UParticleSystemComponent* OurParticleSystem;
class UCollidingPawnMovementComponent* OurMovementComponent;
virtual UPawnMovementComponent* GetMovementComponent() const override;
void MoveForward(float AxisValue);
void MoveRight(float AxisValue);
void Turn(float AxisValue);
void ParticleToggle();
};
CollidingPawn.cpp
// Copyright 1998-2018 Epic Games, Inc. All Rights Reserved.
#include "HowTo_Components.h"
#include "CollidingPawn.h"
#include "CollidingPawnMovementComponent.h"
// Sets default values
ACollidingPawn::ACollidingPawn()
{
// Set this pawn to call Tick() every frame. You can turn this off to improve performance if you don't need it.
PrimaryActorTick.bCanEverTick = true;
// Our root component will be a sphere that reacts to physics
USphereComponent* SphereComponent = CreateDefaultSubobject<USphereComponent>(TEXT("RootComponent"));
RootComponent = SphereComponent;
SphereComponent->InitSphereRadius(40.0f);
SphereComponent->SetCollisionProfileName(TEXT("Pawn"));
// Create and position a mesh component so we can see where our sphere is
UStaticMeshComponent* SphereVisual = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("VisualRepresentation"));
SphereVisual->SetupAttachment(RootComponent);
static ConstructorHelpers::FObjectFinder<UStaticMesh> SphereVisualAsset(TEXT("/Game/StarterContent/Shapes/Shape_Sphere.Shape_Sphere"));
if (SphereVisualAsset.Succeeded())
{
SphereVisual->SetStaticMesh(SphereVisualAsset.Object);
SphereVisual->SetRelativeLocation(FVector(0.0f, 0.0f, -40.0f));
SphereVisual->SetWorldScale3D(FVector(0.8f));
}
// Create a particle system that we can activate or deactivate
OurParticleSystem = CreateDefaultSubobject<UParticleSystemComponent>(TEXT("MovementParticles"));
OurParticleSystem->SetupAttachment(SphereVisual);
OurParticleSystem->bAutoActivate = false;
OurParticleSystem->SetRelativeLocation(FVector(-20.0f, 0.0f, 20.0f));
static ConstructorHelpers::FObjectFinder<UParticleSystem> ParticleAsset(TEXT("/Game/StarterContent/Particles/P_Fire.P_Fire"));
if (ParticleAsset.Succeeded())
{
OurParticleSystem->SetTemplate(ParticleAsset.Object);
}
// Use a spring arm to give the camera smooth, natural-feeling motion.
USpringArmComponent* SpringArm = CreateDefaultSubobject<USpringArmComponent>(TEXT("CameraAttachmentArm"));
SpringArm->SetupAttachment(RootComponent);
SpringArm->RelativeRotation = FRotator(-45.f, 0.f, 0.f);
SpringArm->TargetArmLength = 400.0f;
SpringArm->bEnableCameraLag = true;
SpringArm->CameraLagSpeed = 3.0f;
// Create a camera and attach to our spring arm
UCameraComponent* Camera = CreateDefaultSubobject<UCameraComponent>(TEXT("ActualCamera"));
Camera->SetupAttachment(SpringArm, USpringArmComponent::SocketName);
// Take control of the default player
AutoPossessPlayer = EAutoReceiveInput::Player0;
// Create an instance of our movement component, and tell it to update our root component.
OurMovementComponent = CreateDefaultSubobject<UCollidingPawnMovementComponent>(TEXT("CustomMovementComponent"));
OurMovementComponent->UpdatedComponent = RootComponent;
}
// Called when the game starts or when spawned
void ACollidingPawn::BeginPlay()
{
Super::BeginPlay();
}
// Called every frame
void ACollidingPawn::Tick( float DeltaTime )
{
Super::Tick( DeltaTime );
}
// Called to bind functionality to input
void ACollidingPawn::SetupPlayerInputComponent(class UInputComponent* InputComponent)
{
Super::SetupPlayerInputComponent(InputComponent);
InputComponent->BindAction("ParticleToggle", IE_Pressed, this, &ACollidingPawn::ParticleToggle);
InputComponent->BindAxis("MoveForward", this, &ACollidingPawn::MoveForward);
InputComponent->BindAxis("MoveRight", this, &ACollidingPawn::MoveRight);
InputComponent->BindAxis("Turn", this, &ACollidingPawn::Turn);
}
UPawnMovementComponent* ACollidingPawn::GetMovementComponent() const
{
return OurMovementComponent;
}
void ACollidingPawn::MoveForward(float AxisValue)
{
if (OurMovementComponent && (OurMovementComponent->UpdatedComponent == RootComponent))
{
OurMovementComponent->AddInputVector(GetActorForwardVector() * AxisValue);
}
}
void ACollidingPawn::MoveRight(float AxisValue)
{
if (OurMovementComponent && (OurMovementComponent->UpdatedComponent == RootComponent))
{
OurMovementComponent->AddInputVector(GetActorRightVector() * AxisValue);
}
}
void ACollidingPawn::Turn(float AxisValue)
{
FRotator NewRotation = GetActorRotation();
NewRotation.Yaw += AxisValue;
SetActorRotation(NewRotation);
}
void ACollidingPawn::ParticleToggle()
{
if (OurParticleSystem && OurParticleSystem->Template)
{
OurParticleSystem->ToggleActive();
}
}
CollidingPawnMovementComponent.h
// Copyright 1998-2018 Epic Games, Inc. All Rights Reserved.
#pragma once
#include "GameFramework/PawnMovementComponent.h"
#include "CollidingPawnMovementComponent.generated.h"
/**
*
*/
UCLASS()
class HOWTO_COMPONENTS_API UCollidingPawnMovementComponent : public UPawnMovementComponent
{
GENERATED_BODY()
public:
virtual void TickComponent(float DeltaTime, enum ELevelTick TickType, FActorComponentTickFunction *ThisTickFunction) override;
};
CollidingPawnMovementComponent.cpp
// Copyright 1998-2018 Epic Games, Inc. All Rights Reserved.
#include "HowTo_Components.h"
#include "CollidingPawnMovementComponent.h"
void UCollidingPawnMovementComponent::TickComponent(float DeltaTime, enum ELevelTick TickType, FActorComponentTickFunction *ThisTickFunction)
{
Super::TickComponent(DeltaTime, TickType, ThisTickFunction);
// Make sure that everything is still valid, and that we are allowed to move.
if (!PawnOwner || !UpdatedComponent || ShouldSkipUpdate(DeltaTime))
{
return;
}
// Get (and then clear) the movement vector that we set in ACollidingPawn::Tick
FVector DesiredMovementThisFrame = ConsumeInputVector().GetClampedToMaxSize(1.0f) * DeltaTime * 150.0f;
if (!DesiredMovementThisFrame.IsNearlyZero())
{
FHitResult Hit;
SafeMoveUpdatedComponent(DesiredMovementThisFrame, UpdatedComponent->GetComponentRotation(), true, Hit);
// If we bumped into something, try to slide along it
if (Hit.IsValidBlockingHit())
{
SlideAlongSurface(DesiredMovementThisFrame, 1.f - Hit.Time, Hit.Normal, Hit);
}
}
};