【UE4】GameplayAbilityとAnimNotify/AnimNotifyStateを使ってコンボを作る

// Copyright Epic Games, Inc. All Rights Reserved.

using UnrealBuildTool;

public class MyProject4 : ModuleRules
{
    public MyProject4(ReadOnlyTargetRules Target) : base(Target)
    {
        PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
    
        PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "GameplayAbilities", "GameplayTags", "GameplayTasks" });

        PrivateDependencyModuleNames.AddRange(new string[] {  });

        // Uncomment if you are using Slate UI
        // PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
        
        // Uncomment if you are using online features
        // PrivateDependencyModuleNames.Add("OnlineSubsystem");

        // To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true
    }
}

GameplayAbilitiesとGameplayTags、GameplayTasksをPublicDependencyModuleNamesに追加しました。

次にキャラクターの実装をします。冒頭の記事を参考にC++で作成します。適宜自身のプロジェクトに置き換えてください。

MyCharacter.h

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Character.h"
#include "AbilitySystemInterface.h"
#include "MyAbilitySystemComponent.h"
#include "MyCharacter.generated.h"

class UMyGameplayAbility;

UCLASS()
class MYPROJECT4_API AMyCharacter : public ACharacter, public IAbilitySystemInterface
{
    GENERATED_BODY()

    /** Camera boom positioning the camera behind the character */
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera, meta = (AllowPrivateAccess = "true"))
    class USpringArmComponent* CameraBoom;

    /** Follow camera */
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera, meta = (AllowPrivateAccess = "true"))
    class UCameraComponent* FollowCamera;

public:
    // Sets default values for this character's properties
    AMyCharacter();

    /** Base turn rate, in deg/sec. Other scaling may affect final turn rate. */
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera)
    float BaseTurnRate;

    /** Base look up/down rate, in deg/sec. Other scaling may affect final rate. */
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera)
    float BaseLookUpRate;

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

    /** Called for forwards/backward input */
    void MoveForward(float Value);

    /** Called for side to side input */
    void MoveRight(float Value);

    /**
    * Called via input to turn at a given rate.
    * @param Rate  This is a normalized rate, i.e. 1.0 means 100% of desired turn rate
    */
    void TurnAtRate(float Rate);

    /**
    * Called via input to turn look up/down at a given rate.
    * @param Rate  This is a normalized rate, i.e. 1.0 means 100% of desired turn rate
    */
    void LookUpAtRate(float Rate);

    /** Handler for when a touch input begins. */
    void TouchStarted(ETouchIndex::Type FingerIndex, FVector Location);

    /** Handler for when a touch input stops. */
    void TouchStopped(ETouchIndex::Type FingerIndex, FVector Location);


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

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

public:
    /** Returns CameraBoom subobject **/
    FORCEINLINE class USpringArmComponent* GetCameraBoom() const { return CameraBoom; }
    /** Returns FollowCamera subobject **/
    FORCEINLINE class UCameraComponent* GetFollowCamera() const { return FollowCamera; }

public:
    /*Ability System*/
    UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Abilities", meta = (AllowPrivateAccess = "true"))
        class UMyAbilitySystemComponent* AbilitySystem;

    UAbilitySystemComponent* GetAbilitySystemComponent() const
    {
        return Cast<UAbilitySystemComponent>(AbilitySystem);
    };


    /*Ability List*/
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Abilities")
        TArray<TSubclassOf<class UGameplayAbility>> AbilityList;

    virtual void PossessedBy(AController* NewController) override;

public:
    UFUNCTION(BlueprintCallable, Category = "Abilities")
        bool ActivateAbilitiesWithTags(FGameplayTagContainer AbilityTags, bool bAllowRemoteActivation = true);

    UFUNCTION(BlueprintCallable, Category = "Abilities")
        void GetActiveAbilitiesWithTags(FGameplayTagContainer AbilityTags, TArray<UMyGameplayAbility*>& ActiveAbilities);
};

MyCharacter.cpp

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


#include "MyCharacter.h"
#include "Camera/CameraComponent.h"
#include "Components/CapsuleComponent.h"
#include "Components/InputComponent.h"
#include "GameFramework/CharacterMovementComponent.h"
#include "GameFramework/Controller.h"
#include "GameFramework/SpringArmComponent.h"
//#include <AbilitySystemComponent.h>

// Sets default values
AMyCharacter::AMyCharacter()
{
    GetCapsuleComponent()->InitCapsuleSize(42.f, 96.0f);

    // set our turn rates for input
    BaseTurnRate = 45.f;
    BaseLookUpRate = 45.f;

    // Don't rotate when the controller rotates. Let that just affect the camera.
    bUseControllerRotationPitch = false;
    bUseControllerRotationYaw = false;
    bUseControllerRotationRoll = false;

    // Configure character movement
    GetCharacterMovement()->bOrientRotationToMovement = true; // Character moves in the direction of input...  
    GetCharacterMovement()->RotationRate = FRotator(0.0f, 540.0f, 0.0f); // ...at this rotation rate
    GetCharacterMovement()->JumpZVelocity = 600.f;
    GetCharacterMovement()->AirControl = 0.2f;

    // Create a camera boom (pulls in towards the player if there is a collision)
    CameraBoom = CreateDefaultSubobject<USpringArmComponent>(TEXT("CameraBoom"));
    CameraBoom->SetupAttachment(RootComponent);
    CameraBoom->TargetArmLength = 300.0f; // The camera follows at this distance behind the character  
    CameraBoom->bUsePawnControlRotation = true; // Rotate the arm based on the controller

    // Create a follow camera
    FollowCamera = CreateDefaultSubobject<UCameraComponent>(TEXT("FollowCamera"));
    FollowCamera->SetupAttachment(CameraBoom, USpringArmComponent::SocketName); // Attach the camera to the end of the boom and let the boom adjust to match the controller orientation
    FollowCamera->bUsePawnControlRotation = false; // Camera does not rotate relative to arm

    // Note: The skeletal mesh and anim blueprint references on the Mesh component (inherited from Character) 
    // are set in the derived blueprint asset named MyCharacter (to avoid direct content references in C++)

    AbilitySystem = CreateDefaultSubobject<UMyAbilitySystemComponent>(TEXT("AbilitySystem"));

}

// Called when the game starts or when spawned
void AMyCharacter::BeginPlay()
{
    Super::BeginPlay();
    
    if (AbilitySystem)
    {
        int32 inputID(0);
        if (HasAuthority() && AbilityList.Num() > 0)
        {
            for (auto Ability : AbilityList)
            {
                if (Ability)
                {
                    AbilitySystem->GiveAbility(FGameplayAbilitySpec(Ability.GetDefaultObject(), 1, inputID++));
                }
            }
        }
        AbilitySystem->InitAbilityActorInfo(this, this);
    }
}

void AMyCharacter::MoveForward(float Value)
{
    if ((Controller != nullptr) && (Value != 0.0f))
    {
        // find out which way is forward
        const FRotator Rotation = Controller->GetControlRotation();
        const FRotator YawRotation(0, Rotation.Yaw, 0);

        // get forward vector
        const FVector Direction = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::X);
        AddMovementInput(Direction, Value);
    }
}

void AMyCharacter::MoveRight(float Value)
{
    if ((Controller != nullptr) && (Value != 0.0f))
    {
        // find out which way is right
        const FRotator Rotation = Controller->GetControlRotation();
        const FRotator YawRotation(0, Rotation.Yaw, 0);

        // get right vector 
        const FVector Direction = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::Y);
        // add movement in that direction
        AddMovementInput(Direction, Value);
    }
}

void AMyCharacter::TurnAtRate(float Rate)
{
    // calculate delta for this frame from the rate information
    AddControllerYawInput(Rate * BaseTurnRate * GetWorld()->GetDeltaSeconds());
}

void AMyCharacter::LookUpAtRate(float Rate)
{
    // calculate delta for this frame from the rate information
    AddControllerPitchInput(Rate * BaseLookUpRate * GetWorld()->GetDeltaSeconds());
}

void AMyCharacter::TouchStarted(ETouchIndex::Type FingerIndex, FVector Location)
{
}

void AMyCharacter::TouchStopped(ETouchIndex::Type FingerIndex, FVector Location)
{
}

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

}

// Called to bind functionality to input
void AMyCharacter::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    // Set up gameplay key bindings
    check(PlayerInputComponent);
    PlayerInputComponent->BindAction("Jump", IE_Pressed, this, &ACharacter::Jump);
    PlayerInputComponent->BindAction("Jump", IE_Released, this, &ACharacter::StopJumping);

    PlayerInputComponent->BindAxis("MoveForward", this, &AMyCharacter::MoveForward);
    PlayerInputComponent->BindAxis("MoveRight", this, &AMyCharacter::MoveRight);

    // We have 2 versions of the rotation bindings to handle different kinds of devices differently
    // "turn" handles devices that provide an absolute delta, such as a mouse.
    // "turnrate" is for devices that we choose to treat as a rate of change, such as an analog joystick
    PlayerInputComponent->BindAxis("Turn", this, &APawn::AddControllerYawInput);
    PlayerInputComponent->BindAxis("TurnRate", this, &AMyCharacter::TurnAtRate);
    PlayerInputComponent->BindAxis("LookUp", this, &APawn::AddControllerPitchInput);
    PlayerInputComponent->BindAxis("LookUpRate", this, &AMyCharacter::LookUpAtRate);
}

void AMyCharacter::PossessedBy(AController* NewController)
{
    Super::PossessedBy(NewController);

    AbilitySystem->RefreshAbilityActorInfo();
}

bool AMyCharacter::ActivateAbilitiesWithTags(FGameplayTagContainer AbilityTags, bool bAllowRemoteActivation)
{
    if (AbilitySystem)
    {
        return AbilitySystem->TryActivateAbilitiesByTag(AbilityTags, bAllowRemoteActivation);
    }
    return false;
}

void AMyCharacter::GetActiveAbilitiesWithTags(FGameplayTagContainer AbilityTags, TArray<UMyGameplayAbility*>& ActiveAbilities)
{
    if (AbilitySystem)
    {
        AbilitySystem->GetActiveAbilitiesWithTags(AbilityTags, ActiveAbilities);
    }
}

基本的にはThirdpersonのC++からパクってきてます。一部いらなさそうなやつは削除したりしてます。

キャラクターで使っている独自AbilitySystemComponentとGameplayAbilityを追加で作ります。

MyGameplayAbility.h

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

#pragma once

#include "CoreMinimal.h"
#include "Abilities/GameplayAbility.h"
#include "MyGameplayAbility.generated.h"

/**
 * 
 */
UCLASS()
class MYPROJECT4_API UMyGameplayAbility : public UGameplayAbility
{
    GENERATED_BODY()
    
    UFUNCTION(BlueprintCallable, Category = "GameplayAbility")
    virtual void AddGameplayTags(const FGameplayTagContainer GameplayTags);

    UFUNCTION(BlueprintCallable, Category = "GameplayAbility")
    virtual void RemoveGameplayTags(const FGameplayTagContainer GameplayTags);

};

MyGameplayAbility.cpp

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


#include "MyGameplayAbility.h"
#include "AbilitySystemComponent.h"

void UMyGameplayAbility::AddGameplayTags(const FGameplayTagContainer GameplayTags)
{
    UAbilitySystemComponent* Comp = GetAbilitySystemComponentFromActorInfo();

    Comp->AddLooseGameplayTags(GameplayTags);
}

void UMyGameplayAbility::RemoveGameplayTags(const FGameplayTagContainer GameplayTags)
{
    UAbilitySystemComponent* Comp = GetAbilitySystemComponentFromActorInfo();
    Comp->RemoveLooseGameplayTags(GameplayTags);
}

MyAbilitySystemComponent.h

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

#pragma once

#include "CoreMinimal.h"
#include "AbilitySystemComponent.h"
#include "MyAbilitySystemComponent.generated.h"

/**
 * 
 */

class UMyGameplayAbility;
class UGameplayAbility;

UCLASS()
class MYPROJECT4_API UMyAbilitySystemComponent : public UAbilitySystemComponent
{
    GENERATED_BODY()
public:
    UMyAbilitySystemComponent();

    void GetActiveAbilitiesWithTags(const FGameplayTagContainer& GameplayTagContainer, TArray<UMyGameplayAbility*>& ActiveAbilities);
    static UMyAbilitySystemComponent* GetAbilitySystemComponentFromActor(const AActor* Actor, bool LookForComponent = false);
};

MyAbilitySystemComponent.cpp

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


#include "MyAbilitySystemComponent.h"
#include "MyGameplayAbility.h"
#include "AbilitySystemGlobals.h"

UMyAbilitySystemComponent::UMyAbilitySystemComponent() {}

void UMyAbilitySystemComponent::GetActiveAbilitiesWithTags(const FGameplayTagContainer& GameplayTagContainer, TArray<UMyGameplayAbility*>& ActiveAbilities)
{
    TArray<FGameplayAbilitySpec*> AbilitiesToActivate;
    GetActivatableGameplayAbilitySpecsByAllMatchingTags(GameplayTagContainer, AbilitiesToActivate, false);

    for (FGameplayAbilitySpec* spec : AbilitiesToActivate)
    {
        TArray<UGameplayAbility*> AbilityInstances = spec->GetAbilityInstances();

        for (UGameplayAbility* ActiveAbility : AbilityInstances)
        {
            ActiveAbilities.Add(Cast<UMyGameplayAbility>(ActiveAbility));
        }
    }
}

UMyAbilitySystemComponent* UMyAbilitySystemComponent::GetAbilitySystemComponentFromActor(const AActor* Actor, bool LookForComponent)
{
    return Cast<UMyAbilitySystemComponent>(UAbilitySystemGlobals::GetAbilitySystemComponentFromActor(Actor, LookForComponent));
}