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7 Pawn

060 The Pawn Class

基于 Pawn 创建 C++ 文件 Pawns/Bird.cpp

基于此文件创建蓝图 BP_Bird

061 Capsule Component

Bird.h
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class SLASH_API ABird : public APawn
{
private:
    UPROPERTY(VisibleAnywhere)
    UCapsuleComponent* Capsule;
};
Bird.cpp
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ABird::ABird()
{
    PrimaryActorTick.bCanEverTick = true;

    Capsule = CreateDefaultSubobject<UCapsuleComponent>(TEXT("Capsule"));
    Capsule->SetCapsuleHalfHeight(20.f);
    Capsule->SetCapsuleRadius(15.f);
    SetRootComponent(Capsule);
}

062 Forward Declaration

Bird.h
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class UCapsuleComponent;
Bird.cpp
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#include "Components/CapsuleComponent.h"

063 Skeletal Mesh Components

Bird.h
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class SLASH_API ABird : public APawn
{
private:
    UPROPERTY(VisibleAnywhere)
    USkeletalMeshComponent* BirdMesh;
};
Bird.cpp
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ABird::ABird()
{
    BirdMesh = CreateDefaultSubobject<USkeletalMeshComponent>(TEXT("BirdMesh"));
    BirdMesh->SetupAttachment(GetRootComponent());
}

064 Binding Inputs

添加 BP_Bird 到场景当中，将自动控制玩家设置为 Player 0，开始游戏后，我们的视角就附着在鸟的身上了

Bird.cpp
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ABird::ABird()
{
    AutoPossessPlayer = EAutoReceiveInput::Player0;
}

065 Adding Movement Input

Bird.h
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class SLASH_API ABird : public APawn
{
protected:
    UPROPERTY(EditDefaultsOnly, Category = "CInput")
    TObjectPtr<UInputMappingContext> InputMappingContext;
    UPROPERTY(EditDefaultsOnly, Category = "CInput")
    TObjectPtr<UInputAction> MoveAction;

    void Move(const FInputActionValue& Value);
}
Bird.cpp
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void ABird::BeginPlay()
{
    Super::BeginPlay();

    if (const APlayerController* PlayerController = Cast<APlayerController>(Controller))
    {
        if (UEnhancedInputLocalPlayerSubsystem* Subsystem = ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(PlayerController->GetLocalPlayer()))
        {
            Subsystem->AddMappingContext(InputMappingContext, 0);
        }
    }
}

void ABird::Move(const FInputActionValue& Value)
{
    const FVector2D MovementValue = Value.Get<FVector2D>();

    if (Controller)
    {
        const FVector Forward = GetActorForwardVector();
        AddMovementInput(Forward, MovementValue.X);
        const FVector Right = GetActorRightVector();
        AddMovementInput(Right, MovementValue.Y);
    }
}

void ABird::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);

    if (UEnhancedInputComponent* EnhancedInputComponent= CastChecked<UEnhancedInputComponent>(PlayerInputComponent))
    {
        EnhancedInputComponent->BindAction(MoveAction, ETriggerEvent::Triggered, this, &ABird::Move);
    }
}

由于 Pawn 默认没有移动组件，在 BP_Bird 中添加一个 FloatingPawnMovement 组件

066 Camera and Spring Arm

Bird.h
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class SLASH_API ABird : public APawn
{
protected:
    UPROPERTY(VisibleAnywhere)
    TObjectPtr<USpringArmComponent> CameraBoom;
    UPROPERTY(VisibleAnywhere)
    TObjectPtr<UCameraComponent> ViewCamera;
}
Bird.cpp
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ABird::ABird()
{
    CameraBoom = CreateDefaultSubobject<USpringArmComponent>(TEXT("SpringArm"));
    CameraBoom->SetupAttachment(GetRootComponent());
    CameraBoom->TargetArmLength = 300.f;

    ViewCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("ViewCamera"));
    ViewCamera->SetupAttachment(CameraBoom);
}

067 Adding Controller Input

Bird.h
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class SLASH_API ABird : public APawn
{
protected:
    UPROPERTY(EditDefaultsOnly, Category = "CInput")
    TObjectPtr<UInputAction> LookAction;

    void Look(const FInputActionValue& Value);
}
Bird.cpp
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void ABird::Look(const FInputActionValue& Value)
{
    const FVector2D LookValue = Value.Get<FVector2D>();

    if (Controller)
    {
        AddControllerYawInput(LookValue.X);
        AddControllerPitchInput(LookValue.Y);
    }
}

void ABird::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);

    if (UEnhancedInputComponent* EnhancedInputComponent= CastChecked<UEnhancedInputComponent>(PlayerInputComponent))
    {
        EnhancedInputComponent->BindAction(MoveAction, ETriggerEvent::Triggered, this, &ABird::Move);
        EnhancedInputComponent->BindAction(LookAction, ETriggerEvent::Triggered, this, &ABird::Look);
    }
}

068 Setting the Default Pawn

  1. 基于 GameModeBase 新建蓝图类 BP_BirdGameMode，将默认 Pawn 类改为 BP_Bird
  2. 设置关卡的游戏模式重载为 BP_BirdGameMode
  3. 打开放置 Actor 面板，拖入一个玩家出生点、

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