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RPG58.可拾取物品二:处理玩家拾取事件

news 2025/7/19 15:40:54

1。基于PlayerGameplayABility创建其子类c++，用于处理拾取道具的ability,命名为PlayerGA_PickUpStones

protected://~ Begin UgameplayAbility Interfacevirtual void ActivateAbility(const FGameplayAbilitySpecHandle Handle, const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo, const FGameplayEventData* TriggerEventData) override;virtual void EndAbility(const FGameplayAbilitySpecHandle Handle, const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo, bool bReplicateEndAbility, bool bWasCancelled) override;//~ End UgameplayAbility Interface


void UPlayerGA_PickUpStones::ActivateAbility(const FGameplayAbilitySpecHandle Handle,const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo,const FGameplayEventData* TriggerEventData)
{Super::ActivateAbility(Handle, ActorInfo, ActivationInfo, TriggerEventData);
}void UPlayerGA_PickUpStones::EndAbility(const FGameplayAbilitySpecHandle Handle,const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo,bool bReplicateEndAbility, bool bWasCancelled)
{Super::EndAbility(Handle, ActorInfo, ActivationInfo, bReplicateEndAbility, bWasCancelled);
}

然后创建tag

ARPG_GRIVITY_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(Player_Ability_PickUp_Stones);

	UE_DEFINE_GAMEPLAY_TAG(Player_Ability_PickUp_Stones, "Player.Ability.PickUp.Stones");

2。启动项目，创建一个此类的gameplay蓝图，设置tag和实例化策略

打开DAPlayerStartUAbility，

3。打开XMBStoneBase,覆写父类的函数，在重叠时尝试激活玩家拥有此标签的能力

protected:virtual void OnPickUpCollisionSphereBeginOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult) override;

void AXMBStoneBase::OnPickUpCollisionSphereBeginOverlap(UPrimitiveComponent* OverlappedComponent, AActor* OtherActor,UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{if (AWarriorPlayer* OverlapPlayerCharacter = Cast<AWarriorPlayer>(OtherActor)){OverlapPlayerCharacter->GetXMBAbilitySystemComponent()->TryActivateAbilityByTag(XMBGameplayTags::Player_Ability_PickUp_Stones);}
}

然后打开PlayerGA_PickUpStones

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "AbilitySystem/Abilities/WarriorPlayerGameplayAbility.h"
#include "Items/PickUps/XMBStoneBase.h"
#include "PlayerGA_PickUpStones.generated.h"/*** */
UCLASS()
class ARPG_GRIVITY_API UPlayerGA_PickUpStones : public UWarriorPlayerGameplayAbility
{GENERATED_BODY()protected://~ Begin UgameplayAbility Interfacevirtual void ActivateAbility(const FGameplayAbilitySpecHandle Handle, const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo, const FGameplayEventData* TriggerEventData) override;virtual void EndAbility(const FGameplayAbilitySpecHandle Handle, const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo, bool bReplicateEndAbility, bool bWasCancelled) override;//~ End UgameplayAbility Interface//UFUNCTION(BlueprintCallable)void CollectStones();private://UPROPERTY(EditDefaultsOnly)float BoxTraceDistance = 50.f;//UPROPERTY(EditDefaultsOnly)FVector TraceBoxSize = FVector(100.f);//UPROPERTY(EditDefaultsOnly)TArray<TEnumAsByte<EObjectTypeQuery>> StoneTraceChannel;//UPROPERTY(EditDefaultsOnly)bool bDrawDebugSphere = false;//UPROPERTY()TArray<AXMBStoneBase*> CollectedStones;
};

// Fill out your copyright notice in the Description page of Project Settings.#include "AbilitySystem/Abilities/PlayerGA_PickUpStones.h"#include "Character/WarriorPlayer.h"
#include "Kismet/KismetSystemLibrary.h"
#include "Character/WarriorPlayer.h"
#include "Items/PickUps/XMBStoneBase.h"void UPlayerGA_PickUpStones::ActivateAbility(const FGameplayAbilitySpecHandle Handle,const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo,const FGameplayEventData* TriggerEventData)
{Super::ActivateAbility(Handle, ActorInfo, ActivationInfo, TriggerEventData);
}void UPlayerGA_PickUpStones::EndAbility(const FGameplayAbilitySpecHandle Handle,const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo,bool bReplicateEndAbility, bool bWasCancelled)
{Super::EndAbility(Handle, ActorInfo, ActivationInfo, bReplicateEndAbility, bWasCancelled);
}void UPlayerGA_PickUpStones::CollectStones()
{CollectedStones.Empty();AWarriorPlayer* Player = GetPlayerCharacterFromActorInfo();TArray<FHitResult> TraceHits;UKismetSystemLibrary::BoxTraceMultiForObjects(Player,Player->GetActorLocation(),Player->GetActorLocation() + -Player->GetActorUpVector() * BoxTraceDistance,TraceBoxSize / 2.f,(-Player->GetActorUpVector()).ToOrientationRotator(),StoneTraceChannel,false,TArray<AActor*>(),bDrawDebugSphere? EDrawDebugTrace::ForOneFrame : EDrawDebugTrace::None,TraceHits,true);for (const FHitResult& TraceHit : TraceHits){if (AXMBStoneBase* FoundStone = Cast<AXMBStoneBase>(TraceHit.GetActor())){CollectedStones.AddUnique(FoundStone);}}if (CollectedStones.IsEmpty()){CancelAbility(GetCurrentAbilitySpecHandle(),GetCurrentActorInfo(),GetCurrentActivationInfo(),true);}
}

设置为场景动态

4。创建新标签

	ARPG_GRIVITY_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(InputTag_PickUp_Stones);
ARPG_GRIVITY_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(Player_Event_ConsumeStones);

	UE_DEFINE_GAMEPLAY_TAG(InputTag_PickUp_Stones, "InputTag.PickUp.Stones");UE_DEFINE_GAMEPLAY_TAG(Player_Event_ConsumeStones, "Player.Event.ConsumeStones");

为了设置玩家在接触石头后需要进行输入才能拾取并应用效果，我们需要添加一个输入。

打开WarriorPlayer.h

void Input_PickUpStonesStarted(const FInputActionValue& InputActionValue);

void AWarriorPlayer::Input_PickUpStonesStarted(const FInputActionValue& InputActionValue)
{FGameplayEventData Data;UAbilitySystemBlueprintLibrary::SendGameplayEventToActor(this,XMBGameplayTags::Player_Event_ConsumeStones,Data);
}

然后前往构造函数进行绑定

	//WarriorInputComponent->BindAbilityInputAction(InputConfigDataAsset, this, &ThisClass::Input_AbilityInputTagPressed,&AWarriorPlayer::Input_AbilityInputTagReleased);

启动项目，打开DA_InputConfig，新建一个IA

我们需要添加一个输入

打开XMBStoneBase.h，需要先完善这个函数

//void Consume(UXMBAbilitySystemComponent* AbilitySystemComponent,int32 ApplyLevel);
protected:
//UFUNCTION(BlueprintImplementableEvent,meta = (displayname = "On Stone Consumed"))void BP_OnStoneConsumed();//UPROPERTY(EditDefaultsOnly)TSubclassOf<UGameplayEffect> StoneGameplayEffectClass;

void AXMBStoneBase::Consume(UXMBAbilitySystemComponent* AbilitySystemComponent, int32 ApplyLevel)
{check(StoneGameplayEffectClass);//获取游戏效果的默认对象CDO//调用 UClass 的模板方法，获取该类的 默认对象（CDO）。CDO 是类在加载时创建的全局单例，包含类定义的默认属性值UGameplayEffect* EffectCDO = StoneGameplayEffectClass->GetDefaultObject<UGameplayEffect>();AbilitySystemComponent->ApplyGameplayEffectToSelf(EffectCDO,ApplyLevel,AbilitySystemComponent->MakeEffectContext());BP_OnStoneConsumed();}

打开PlayerGA_PickUpStones.h，创建函数，用于在蓝图内接收事件后调用

//接收事件后调用的函数UFUNCTION(BlueprintCallable)void ConsumeStones();

void UPlayerGA_PickUpStones::ConsumeStones()
{if (CollectedStones.IsEmpty()){CancelAbility(GetCurrentAbilitySpecHandle(),GetCurrentActorInfo(),GetCurrentActivationInfo(),true);return;}for (AXMBStoneBase* CollectedStone : CollectedStones){if (CollectedStone){//在一次拾取内存多个拾取的石子应用效果CollectedStone->Consume(XMBGetAbilitySystemComponentFromActorInfo(),GetAbilityLevel());}}}

然后打开蓝图,这里是制作接收事件后角色属性的改变