U++学习笔记 基础人物轴绑定及映射绑定

PawnWithCamera.h：

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "PawnWithCamera.generated.h"

UCLASS()
class FLOATINGCUBE_API APawnWithCamera : public APawn
{
	GENERATED_BODY()

public:
	// Sets default values for this pawn's properties
	APawnWithCamera();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

	UPROPERTY(EditAnywhere)
		class USpringArmComponent* SpringArmComp;

	UPROPERTY(EditAnywhere)
		class UCameraComponent* CameraComp;

	UPROPERTY(EditAnywhere)
		class UStaticMeshComponent* StaticMeshComp;

	FVector2D MovementInput;
	FVector2D CameraInput;
	float ZoomFactor;
	bool bZoomingIn;

public:	
	// Called every frame
	virtual void Tick(float DeltaTime) override;

	// Called to bind functionality to input
	virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;

	void MoveForward(float AxisValue);
	void MoveRight(float AxisValue);
	void PitchCamera(float AxisValue);
	void YawCamera(float AxisValue);
	void ZoomIn();
	void ZoomOut();

};

PawnWithCamera.cpp：

// Fill out your copyright notice in the Description page of Project Settings.


#include "PawnWithCamera.h"
#include "GameFramework/SpringArmComponent.h"
#include "Camera/CameraComponent.h"
#include "FloatingCube.h"
// Sets default values
APawnWithCamera::APawnWithCamera()
{
    // Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    RootComponent = CreateDefaultSubobject<USceneComponent>(TEXT("RootSceneComponent"));
    StaticMeshComp = CreateDefaultSubobject <UStaticMeshComponent>(TEXT("StaticMeshComponent"));
    SpringArmComp = CreateDefaultSubobject<USpringArmComponent>(TEXT("SpringArmComponent"));
    CameraComp = CreateDefaultSubobject<UCameraComponent>(TEXT("CameraComponent"));

    //Attach our components
    StaticMeshComp->SetupAttachment(RootComponent);
    SpringArmComp->SetupAttachment(StaticMeshComp);
    CameraComp->SetupAttachment(SpringArmComp, USpringArmComponent::SocketName);

    //Assign SpringArm class variables.
    SpringArmComp->SetRelativeLocationAndRotation(FVector(0.0f, 0.0f, 50.0f), FRotator(-60.0f, 0.0f, 0.0f));
    SpringArmComp->TargetArmLength = 400.f;
    SpringArmComp->bEnableCameraLag = true;
    SpringArmComp->CameraLagSpeed = 3.0f;

    //Take control of the default Player
    AutoPossessPlayer = EAutoReceiveInput::Player0;
}

// Called when the game starts or when spawned
void APawnWithCamera::BeginPlay()
{
    Super::BeginPlay();

}

// Called every frame
void APawnWithCamera::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

    if (bZoomingIn) {
        ZoomFactor += DeltaTime / 0.5f;
    }
    else {
        ZoomFactor -= DeltaTime / 0.25f;
    }
    ZoomFactor = FMath::Clamp<float>(ZoomFactor, 0.0f, 1.0f);

    CameraComp->FieldOfView = FMath::Lerp<float>(90.0f, 60.0f, ZoomFactor);
    SpringArmComp->TargetArmLength = FMath::Lerp<float>(400.0f, 300.0f, ZoomFactor);

    {
        FRotator NewRotation = GetActorRotation();
        NewRotation.Yaw += CameraInput.X;
        SetActorRotation(NewRotation);
    }

    {
        FRotator NewRotation = SpringArmComp->GetComponentRotation();
        NewRotation.Pitch = FMath::Clamp(NewRotation.Pitch + CameraInput.Y, -80.0f, -15.0f);
        SpringArmComp->SetWorldRotation(NewRotation);
    }

    {
        if (!MovementInput.IsZero())
        {
            //Scale our movement input axis values by 100 units per second
            MovementInput = MovementInput.GetSafeNormal() * 100.0f;
            FVector NewLocation = GetActorLocation();
            NewLocation += GetActorForwardVector() * MovementInput.X * DeltaTime;
            NewLocation += GetActorRightVector() * MovementInput.Y * DeltaTime;
            SetActorLocation(NewLocation);
        }
    }
}

// Called to bind functionality to input
void APawnWithCamera::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);
    InputComponent->BindAction("ZoomIn", IE_Pressed, this, &APawnWithCamera::ZoomIn);
    InputComponent->BindAction("ZoomIn", IE_Released, this, &APawnWithCamera::ZoomOut);
    InputComponent->BindAxis("MoveForward", this, &APawnWithCamera::MoveForward);
    InputComponent->BindAxis("MoveRight", this, &APawnWithCamera::MoveRight);
    InputComponent->BindAxis("CameraPitch", this, &APawnWithCamera::PitchCamera);
    InputComponent->BindAxis("CameraYaw", this, &APawnWithCamera::YawCamera);
}

void APawnWithCamera::MoveForward(float AxisValue) {
    MovementInput.X = FMath::Clamp<float>(AxisValue, -1.0f, 1.0f);
}

void APawnWithCamera::MoveRight(float AxisValue) {
    MovementInput.Y = FMath::Clamp<float>(AxisValue, -1.0f, 1.0f);
}

void APawnWithCamera::PitchCamera(float AxisValue) {
    CameraInput.Y = AxisValue;
}

void APawnWithCamera::YawCamera(float AxisValue) {
    CameraInput.X = AxisValue;
}

void APawnWithCamera::ZoomIn() {
    bZoomingIn = true;
}

void APawnWithCamera::ZoomOut() {
    bZoomingIn = false;
}