{"id":83,"date":"2021-09-09T23:07:39","date_gmt":"2021-09-09T15:07:39","guid":{"rendered":"http:\/\/www.jinhaihan.top\/WordPress\/?p=83"},"modified":"2021-10-07T17:44:12","modified_gmt":"2021-10-07T09:44:12","slug":"%e4%b8%80%e7%a7%8d%e7%ae%80%e5%8d%95%e7%9a%84cai-task%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/www.jinhaihan.top\/WordPress\/%e4%b8%80%e7%a7%8d%e7%ae%80%e5%8d%95%e7%9a%84cai-task%e5%ae%9e%e7%8e%b0\/","title":{"rendered":"\u4e00\u79cd\u7b80\u5355\u7684C++AI Task\u5b9e\u73b0"},"content":{"rendered":"

\u7ecf\u8fc7\u8003\u8651\uff0c\u51b3\u5b9a\u4f7f\u7528C++\u5199AI\u7c7b\u4ee5\u63d0\u5347\u6027\u80fd\u3002
\n\u4f46\u5bf9\u4e8eC++\u7684AI Task\u7c7b\u6ca1\u6709\u7ecf\u9a8c\uff0c\u4e5f\u6ca1\u6709\u4e00\u4e9b\u4f18\u79c0\u7684\u6837\u4f8b\u5b66\u4e60\u53c2\u8003\uff0c\u4e8e\u662f\u60f3\u5230\u53c2\u8003\u5f15\u64ce\u5185\u7684\u5b9e\u73b0\u3002<\/p>\n

\u53c2\u8003\u84dd\u56fe\u7c7bUBTTask_BlueprintBase\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u53ef\u4ee5\u65b0\u5efaC++\u7c7b\u5e76\u590d\u5236\u5185\u5bb9\u3002<\/p>\n

\u6ce8\u610f\uff0c\u6b64\u5904\u5e94\u5f53\u6ce8\u91ca\u6216\u5220\u9664FBTNodeBPImplementationHelper::AISpecific<\/code>\uff0c\u6b64\u4e3a\u5e38\u91cf\u4f1a\u5f71\u54cd\u8fd0\u884c\u3002<\/p>\n

\u590d\u5236\u4e4b\u540e\uff0c\u53ef\u4ee5\u5c06\u6b64\u4f5c\u4e3aC++\u7684AI\u57fa\u7c7b\u3002\u5728\u5b50\u7c7b\u7684\u6784\u9020\u51fd\u6570\u4e2d\u542f\u7528\u76f8\u5e94\u7684\u53d8\u91cf\uff0c\u5373\u53ef\u542f\u7528\u5bf9\u5e94\u7684\u51fd\u6570\u56de\u8c03\u3002<\/p>\n

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\/\/.CPP File\n\/\/\u6784\u9020\u5668\u4e2d\u542f\u7528ReceiveExecuteAI\u3001Tick\u7684\u56de\u8c03\uff1a\nUBTTask_Follow::UBTTask_Follow(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)\n{\n    ReceiveExecuteImplementations = 1;\n    ReceiveTickImplementations = 1;\n    bNotifyTick =1;\n}\n\n\/\/\u5b9e\u73b0\u56de\u8c03\uff1a\nvoid UBTTask_Follow::ReceiveExecuteAI(AAIController* OwnerController, APawn* ControlledPawn)\n{\n}\n\nvoid UBTTask_Follow::ReceiveTickAI(AAIController* OwnerController, APawn* ControlledPawn, float DeltaSeconds)\n{\n}<\/code><\/pre>\n
\/\/.h File\nUCLASS()\nclass PROJECTSPARK_API UBTTask_Follow : public UTaskNodeBase\n{\n    GENERATED_BODY()\n    UBTTask_Follow(const FObjectInitializer& ObjectInitializer);\n\n    public:\n\n    protected:\n    virtual void ReceiveExecuteAI(AAIController* OwnerController, APawn* ControlledPawn) override;\n    virtual void ReceiveTickAI(AAIController* OwnerController, APawn* ControlledPawn, float DeltaSeconds) override;\n};\n<\/code><\/pre>\n
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\u4e0b\u9762\u662f\u57fa\u7c7b\u5b9e\u73b0\uff1a<\/p>\n
\/\/.h File\n\/\/ Fill out your copyright notice in the Description page of Project Settings.\n\n#pragma once\n\n#include "CoreMinimal.h"\n#include "UObject\/ObjectMacros.h"\n#include "BehaviorTree\/BTTaskNode.h"\n#include "TaskNodeBase.generated.h"\n\nUCLASS()\nclass PROJECTSPARK_API UTaskNodeBase : public UBTTaskNode\n{\n    GENERATED_BODY()\n    virtual EBTNodeResult::Type ExecuteTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) override;\n    virtual EBTNodeResult::Type AbortTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) override;\n\n    virtual FString GetStaticDescription() const override;\n    virtual void DescribeRuntimeValues(const UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory, EBTDescriptionVerbosity::Type Verbosity, TArray<FString>& Values) const override;\n    virtual void OnInstanceDestroyed(UBehaviorTreeComponent& OwnerComp) override;\n    virtual void OnTaskFinished(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory, EBTNodeResult::Type TaskResult) override;\n    virtual void InitializeFromAsset(UBehaviorTree& Asset) override;\n\n    virtual void SetOwner(AActor* ActorOwner) override;\n\n#if WITH_EDITOR\n    virtual bool UsesBlueprint() const override;\n#endif\n\npublic:\n    UTaskNodeBase(const FObjectInitializer& ObjectInitializer);\n\nprotected:\n    \/** Cached AIController owner of BehaviorTreeComponent. *\/\n    UPROPERTY(Transient)\n    TObjectPtr<AAIController> AIOwner;\n\n    \/** Cached actor owner of BehaviorTreeComponent. *\/\n    UPROPERTY(Transient)\n    TObjectPtr<AActor> ActorOwner;\n\n    \/** If any of the Tick functions is implemented, how often should they be ticked.\n     *  Values < 0 mean 'every tick'. *\/\n    UPROPERTY(EditAnywhere, Category = Task)\n    FIntervalCountdown TickInterval;\n\n    \/** temporary variable for ReceiveExecute(Abort)-FinishExecute(Abort) chain *\/\n    mutable TEnumAsByte<EBTNodeResult::Type> CurrentCallResult;\n\n    \/** properties that should be copied *\/\n    TArray<FProperty*> PropertyData;\n\n#if WITH_EDITORONLY_DATA\n    UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = Description)\n    FString CustomDescription;\n#endif \/\/ WITH_EDITORONLY_DATA\n\n    \/** show detailed information about properties *\/\n    UPROPERTY(EditInstanceOnly, Category=Description)\n    uint32 bShowPropertyDetails : 1;\n\n    \/** set if ReceiveTick is implemented by blueprint *\/\n    uint32 ReceiveTickImplementations : 2;\n\n    \/** set if ReceiveExecute is implemented by blueprint *\/\n    uint32 ReceiveExecuteImplementations : 2;\n\n    \/** set if ReceiveAbort is implemented by blueprint *\/\n    uint32 ReceiveAbortImplementations : 2;\n\n    \/** set when task enters Aborting state *\/\n    uint32 bIsAborting : 1;\n\n    \/** if set, execution is inside blueprint's ReceiveExecute(Abort) event\n      * FinishExecute(Abort) function should store their result in CurrentCallResult variable *\/\n    mutable uint32 bStoreFinishResult : 1;\n\n    \/** entry point, task will stay active until FinishExecute is called.\n     *  @Note that if both generic and AI event versions are implemented only the more \n     *  suitable one will be called, meaning the AI version if called for AI, generic one otherwise *\/\n    UFUNCTION(BlueprintImplementableEvent)\n    void ReceiveExecute(AActor* OwnerActor);\n\n    \/** if blueprint graph contains this event, task will stay active until FinishAbort is called\n     *  @Note that if both generic and AI event versions are implemented only the more\n     *  suitable one will be called, meaning the AI version if called for AI, generic one otherwise *\/\n    UFUNCTION(BlueprintImplementableEvent)\n    void ReceiveAbort(AActor* OwnerActor);\n\n    \/** tick function\n     *  @Note that if both generic and AI event versions are implemented only the more\n     *  suitable one will be called, meaning the AI version if called for AI, generic one otherwise *\/\n    UFUNCTION(BlueprintImplementableEvent)\n    void ReceiveTick(AActor* OwnerActor, float DeltaSeconds);\n\n    \/** Alternative AI version of ReceiveExecute\n    *   @see ReceiveExecute for more details\n     *  @Note that if both generic and AI event versions are implemented only the more\n     *  suitable one will be called, meaning the AI version if called for AI, generic one otherwise *\/\n    virtual void ReceiveExecuteAI(AAIController* OwnerController, APawn* ControlledPawn);\n\n    \/** Alternative AI version of ReceiveAbort\n     *  @see ReceiveAbort for more details\n     *  @Note that if both generic and AI event versions are implemented only the more\n     *  suitable one will be called, meaning the AI version if called for AI, generic one otherwise *\/\n    UFUNCTION(BlueprintImplementableEvent, Category = AI)\n    void ReceiveAbortAI(AAIController* OwnerController, APawn* ControlledPawn);\n\n    \/** Alternative AI version of tick function.\n     *  @see ReceiveTick for more details\n     *  @Note that if both generic and AI event versions are implemented only the more\n     *  suitable one will be called, meaning the AI version if called for AI, generic one otherwise *\/\n    virtual void ReceiveTickAI(AAIController* OwnerController, APawn* ControlledPawn, float DeltaSeconds);\n\n    \/** finishes task execution with Success or Fail result *\/\n    UFUNCTION(BlueprintCallable, Category="AI|BehaviorTree")\n    void FinishExecute(bool bSuccess);\n\n    \/** aborts task execution *\/\n    UFUNCTION(BlueprintCallable, Category="AI|BehaviorTree")\n    void FinishAbort();\n\n    \/** task execution will be finished (with result 'Success') after receiving specified message *\/\n    UFUNCTION(BlueprintCallable, Category="AI|BehaviorTree")\n    void SetFinishOnMessage(FName MessageName);\n\n    \/** task execution will be finished (with result 'Success') after receiving specified message with indicated ID *\/\n    UFUNCTION(BlueprintCallable, Category="AI|BehaviorTree")\n    void SetFinishOnMessageWithId(FName MessageName, int32 RequestID = -1);\n\n    \/** check if task is currently being executed *\/\n    UFUNCTION(BlueprintCallable, Category="AI|BehaviorTree")\n    bool IsTaskExecuting() const;\n\n    \/** check if task is currently being aborted *\/\n    UFUNCTION(BlueprintCallable, Category = "AI|BehaviorTree")\n    bool IsTaskAborting() const;\n\n    \/** ticks this task *\/\n    virtual void TickTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory, float DeltaSeconds) override;\n};<\/code><\/pre>\n
\/\/.cpp File \n\/\/ Fill out your copyright notice in the Description page of Project Settings.\n\n#include "AIModule\/TaskNodeBase.h"\n#include "AIController.h"\n#include "BehaviorTree\/BTFunctionLibrary.h"\n#include "BlueprintNodeHelpers.h"\n#include "BehaviorTree\/BehaviorTree.h"\n\nUTaskNodeBase::UTaskNodeBase(const FObjectInitializer& ObjectInitializer) : Super(ObjectInitializer)\n{\n    UClass* StopAtClass = UTaskNodeBase::StaticClass();\n    ReceiveTickImplementations = FBTNodeBPImplementationHelper::CheckEventImplementationVersion(TEXT("ReceiveTick"), TEXT("ReceiveTickAI"), *this, *StopAtClass);\n    ReceiveExecuteImplementations = FBTNodeBPImplementationHelper::CheckEventImplementationVersion(TEXT("ReceiveExecute"), TEXT("ReceiveExecuteAI"), *this, *StopAtClass);\n    ReceiveAbortImplementations = FBTNodeBPImplementationHelper::CheckEventImplementationVersion(TEXT("ReceiveAbort"), TEXT("ReceiveAbortAI"), *this, *StopAtClass);\n\n    bNotifyTick = ReceiveTickImplementations != FBTNodeBPImplementationHelper::NoImplementation;\n    bNotifyTaskFinished = true;\n    bShowPropertyDetails = true;\n    bIsAborting = false;\n\n    \/\/ all blueprint based nodes must create instances\n    bCreateNodeInstance = true;\n\n    if (HasAnyFlags(RF_ClassDefaultObject))\n    {\n        BlueprintNodeHelpers::CollectPropertyData(this, StopAtClass, PropertyData);\n    }\n}\n\nvoid UTaskNodeBase::InitializeFromAsset(UBehaviorTree& Asset)\n{\n    Super::InitializeFromAsset(Asset);\n    if (Asset.BlackboardAsset)\n    {\n        BlueprintNodeHelpers::ResolveBlackboardSelectors(*this, *StaticClass(), *Asset.BlackboardAsset);\n    }\n}\n\nvoid UTaskNodeBase::SetOwner(AActor* InActorOwner) \n{ \n    ActorOwner = InActorOwner;\n    AIOwner = Cast<AAIController>(InActorOwner);\n}\n\nEBTNodeResult::Type UTaskNodeBase::ExecuteTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory)\n{\n    \/\/ fail when task doesn't react to execution (start or tick)\n    CurrentCallResult = (ReceiveExecuteImplementations != 0 || ReceiveTickImplementations != 0) ? EBTNodeResult::InProgress : EBTNodeResult::Failed;\n    bIsAborting = false;\n\n    if (ReceiveExecuteImplementations != FBTNodeBPImplementationHelper::NoImplementation)\n    {\n        bStoreFinishResult = true;\n\n        if (AIOwner != nullptr && (ReceiveExecuteImplementations\/*& FBTNodeBPImplementationHelper::AISpecific*\/))\n        {\n            ReceiveExecuteAI(AIOwner, AIOwner->GetPawn());\n        }\n        else if (ReceiveExecuteImplementations & FBTNodeBPImplementationHelper::Generic)\n        {\n            ReceiveExecute(ActorOwner);\n        }\n\n        bStoreFinishResult = false;\n    }\n\n    return CurrentCallResult;\n}\n\nEBTNodeResult::Type UTaskNodeBase::AbortTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory)\n{\n    \/\/ force dropping all pending latent actions associated with this blueprint\n    \/\/ we can't have those resuming activity when node is\/was aborted\n    BlueprintNodeHelpers::AbortLatentActions(OwnerComp, *this);\n\n    CurrentCallResult = ReceiveAbortImplementations != 0 ? EBTNodeResult::InProgress : EBTNodeResult::Aborted;\n    bIsAborting = true;\n\n    if (ReceiveAbortImplementations != FBTNodeBPImplementationHelper::NoImplementation)\n    {\n        bStoreFinishResult = true;\n\n        if (AIOwner != nullptr && (ReceiveAbortImplementations & FBTNodeBPImplementationHelper::AISpecific))\n        {\n            ReceiveAbortAI(AIOwner, AIOwner->GetPawn());\n        }\n        else if (ReceiveAbortImplementations & FBTNodeBPImplementationHelper::Generic)\n        {\n            ReceiveAbort(ActorOwner);\n        }\n\n        bStoreFinishResult = false;\n    }\n\n    return CurrentCallResult;\n}\n\nvoid UTaskNodeBase::TickTask(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory, float DeltaSeconds)\n{\n    if (TickInterval.Tick(DeltaSeconds))\n    {\n        DeltaSeconds = TickInterval.GetElapsedTimeWithFallback(DeltaSeconds);\n\n        if (AIOwner != nullptr && (ReceiveTickImplementations \/*& FBTNodeBPImplementationHelper::AISpecific*\/))\n        {\n            ReceiveTickAI(AIOwner, AIOwner->GetPawn(), DeltaSeconds);\n        }\n        else if (ReceiveTickImplementations & FBTNodeBPImplementationHelper::Generic)\n        {\n            ReceiveTick(ActorOwner, DeltaSeconds);\n        }\n\n        TickInterval.Reset();\n    }\n}\n\nvoid UTaskNodeBase::OnTaskFinished(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory, EBTNodeResult::Type TaskResult)\n{\n    Super::OnTaskFinished(OwnerComp, NodeMemory, TaskResult);\n\n    TickInterval.Set(0); \/\/ so that we tick as soon as enabled back\n\n    if (TaskResult != EBTNodeResult::InProgress)\n    {\n        BlueprintNodeHelpers::AbortLatentActions(OwnerComp, *this);\n    }\n}\n\nvoid UTaskNodeBase::FinishExecute(bool bSuccess)\n{\n    UBehaviorTreeComponent* OwnerComp = Cast<UBehaviorTreeComponent>(GetOuter());\n    EBTNodeResult::Type NodeResult(bSuccess ? EBTNodeResult::Succeeded : EBTNodeResult::Failed);\n\n    if (bStoreFinishResult)\n    {\n        CurrentCallResult = NodeResult;\n    }\n    else if (OwnerComp && !bIsAborting)\n    {\n        FinishLatentTask(*OwnerComp, NodeResult);\n    }\n}\n\nvoid UTaskNodeBase::FinishAbort()\n{\n    UBehaviorTreeComponent* OwnerComp = Cast<UBehaviorTreeComponent>(GetOuter());\n    EBTNodeResult::Type NodeResult(EBTNodeResult::Aborted);\n\n    if (bStoreFinishResult)\n    {\n        CurrentCallResult = NodeResult;\n    }\n    else if (OwnerComp && bIsAborting)\n    {\n        FinishLatentAbort(*OwnerComp);\n    }\n}\n\nbool UTaskNodeBase::IsTaskExecuting() const\n{\n    UBehaviorTreeComponent* OwnerComp = Cast<UBehaviorTreeComponent>(GetOuter());\n    EBTTaskStatus::Type TaskStatus = OwnerComp->GetTaskStatus(this);\n\n    return (TaskStatus == EBTTaskStatus::Active);\n}\n\nbool UTaskNodeBase::IsTaskAborting() const\n{\n    \/\/ use already cached data\n    return bIsAborting;\n}\n\nvoid UTaskNodeBase::SetFinishOnMessage(FName MessageName)\n{\n    UBehaviorTreeComponent* OwnerComp = Cast<UBehaviorTreeComponent>(GetOuter());\n    if (OwnerComp)\n    {\n        OwnerComp->RegisterMessageObserver(this, MessageName);\n    }\n}\n\nvoid UTaskNodeBase::SetFinishOnMessageWithId(FName MessageName, int32 RequestID)\n{\n    UBehaviorTreeComponent* OwnerComp = Cast<UBehaviorTreeComponent>(GetOuter());\n    if (OwnerComp)\n    {\n        OwnerComp->RegisterMessageObserver(this, MessageName, RequestID);\n    }\n}\n\nFString UTaskNodeBase::GetStaticDescription() const\n{\n    FString ReturnDesc =\n#if WITH_EDITORONLY_DATA\n        CustomDescription.Len() ? CustomDescription :\n#endif \/\/ WITH_EDITORONLY_DATA\n        Super::GetStaticDescription();\n\n    UTaskNodeBase* CDO = (UTaskNodeBase*)(GetClass()->GetDefaultObject());\n    if (bShowPropertyDetails && CDO)\n    {\n        UClass* StopAtClass = UTaskNodeBase::StaticClass();\n        FString PropertyDesc = BlueprintNodeHelpers::CollectPropertyDescription(this, StopAtClass, CDO->PropertyData);\n        if (PropertyDesc.Len())\n        {\n            ReturnDesc += TEXT(":\\n\\n");\n            ReturnDesc += PropertyDesc;\n        }\n    }\n\n    return ReturnDesc;\n}\n\nvoid UTaskNodeBase::DescribeRuntimeValues(const UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory, EBTDescriptionVerbosity::Type Verbosity, TArray<FString>& Values) const\n{\n    UTaskNodeBase* CDO = (UTaskNodeBase*)(GetClass()->GetDefaultObject());\n    if (CDO && CDO->PropertyData.Num())\n    {\n        BlueprintNodeHelpers::DescribeRuntimeValues(this, CDO->PropertyData, Values);\n    }\n}\n\nvoid UTaskNodeBase::OnInstanceDestroyed(UBehaviorTreeComponent& OwnerComp)\n{\n    \/\/ force dropping all pending latent actions associated with this blueprint\n    BlueprintNodeHelpers::AbortLatentActions(OwnerComp, *this);\n}\n\n#if WITH_EDITOR\n\nbool UTaskNodeBase::UsesBlueprint() const\n{\n    return true;\n}\n\n#endif \/\/ WITH_EDITOR\n\nvoid UTaskNodeBase::ReceiveExecuteAI(AAIController* OwnerController, APawn* ControlledPawn)\n{\n}\n\nvoid UTaskNodeBase::ReceiveTickAI(AAIController* OwnerController, APawn* ControlledPawn, float DeltaSeconds)\n{\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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