Source/Nakatomi/Decorators/BTDCanSeeTarget.cpp

@@ -0,0 +1,27 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "../Decorators/BTDCanSeeTarget.h"
+
+#include "AIController.h"
+#include "BehaviorTree/BlackboardComponent.h"
+
+bool UBTDCanSeeTarget::CalculateRawConditionValue(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) const
+{
+	FHitResult HitResult;
+	
+	FVector Start = OwnerComp.GetAIOwner()->GetPawn()->GetActorLocation();
+
+	UBlackboardComponent* BlackboardComponent = OwnerComp.GetBlackboardComponent();
+	AActor* TargetActor = Cast<AActor>(BlackboardComponent->GetValueAsObject(TargetActorKey.SelectedKeyName));
+	FVector End = TargetActor->GetActorLocation();
+
+	GetWorld()->LineTraceSingleByChannel(HitResult, Start, End, ECC_Pawn);
+
+	if (HitResult.GetActor())
+	{
+		return true;
+	}
+
+	return false;
+}

Source/Nakatomi/Decorators/BTDCanSeeTarget.h

@@ -0,0 +1,24 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "BehaviorTree/BTDecorator.h"
+#include "BTDCanSeeTarget.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class NAKATOMI_API UBTDCanSeeTarget : public UBTDecorator
+{
+	GENERATED_BODY()
+
+public:
+	UPROPERTY(EditAnywhere, Category = "Options",
+		Meta = (AllowPrivateAccess = "true", DisplayName = "Target Actor Key"))
+	FBlackboardKeySelector TargetActorKey;
+
+protected:
+	virtual bool CalculateRawConditionValue(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) const override;
+};

Source/Nakatomi/Decorators/BTDIsHealthBelowThreshold.cpp

@@ -0,0 +1,14 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "../Decorators/BTDIsHealthBelowThreshold.h"
+
+#include "BehaviorTree/BlackboardComponent.h"
+
+bool UBTDIsHealthBelowThreshold::CalculateRawConditionValue(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) const
+{
+	UBlackboardComponent* BlackboardComponent = OwnerComp.GetBlackboardComponent();
+	float currentHealth = BlackboardComponent->GetValueAsFloat(CurrentHealthKey.SelectedKeyName);
+	
+	return currentHealth <= HealthThreshold ? true : false;
+}

Source/Nakatomi/Decorators/BTDIsHealthBelowThreshold.h

@@ -0,0 +1,29 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "BehaviorTree/BTDecorator.h"
+#include "BTDIsHealthBelowThreshold.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class NAKATOMI_API UBTDIsHealthBelowThreshold : public UBTDecorator
+{
+	GENERATED_BODY()
+
+public:
+
+	UPROPERTY(EditAnywhere, Category = "Options",
+		Meta = (AllowPrivateAccess = "true", DisplayName = "Current Health Key"))
+	FBlackboardKeySelector CurrentHealthKey;
+
+	UPROPERTY(EditAnywhere, Category = "Options",
+	Meta = (AllowPrivateAccess = "true", DisplayName = "Health Threshold"))
+	float HealthThreshold = 25.0f;
+
+protected:
+	virtual bool CalculateRawConditionValue(UBehaviorTreeComponent& OwnerComp, uint8* NodeMemory) const override;
+};

Source/Nakatomi/EnemyCharacter.cpp

@@ -4,6 +4,9 @@
 #include "EnemyAIController.h"
 #include "EnemyHealthComponent.h"
 #include "InteractableComponent.h"
+#include "BehaviorTree/BehaviorTree.h"
+#include "BehaviorTree/BlackboardComponent.h"
+#include "BehaviorTree/BlackboardData.h"
 
 #define COLLISION_WEAPON	ECC_GameTraceChannel1
 
@@ -16,7 +19,7 @@ AEnemyCharacter::AEnemyCharacter(const FObjectInitializer& ObjectInitializer) :
 	GetHealthComponent()->OnDamaged.BindUFunction(this, "OnDamaged");
 	GetHealthComponent()->OnDeath.BindUFunction(this, "OnDeath");
 	GetHealthComponent()->SetMaxHealth(100.0f);
-
+	
 	this->Tags.Add(FName("Enemy"));
 }
 
@@ -54,6 +57,10 @@ void AEnemyCharacter::WeaponCooldownHandler()
 void AEnemyCharacter::BeginPlay()
 {
 	Super::BeginPlay();
+
+	AEnemyAIController* controller = Cast<AEnemyAIController>(GetController());
+	controller->GetBlackboardComponent()->SetValueAsFloat("CurrentHealth", GetHealthComponent()->GetCurrentHealth());
+	GetHealthComponent()->OnDamaged.BindUFunction(this, "OnDamaged");
 }
 
 void AEnemyCharacter::PlayOnFireAnimations()
@@ -130,3 +137,12 @@ void AEnemyCharacter::ProcessHits(TArray<FHitResult> hits)
 		}
 	}
 }
+
+void AEnemyCharacter::OnDamaged()
+{
+	Super::OnDamaged();
+
+	AEnemyAIController* controller = Cast<AEnemyAIController>(GetController());
+	controller->GetBlackboardComponent()->SetValueAsFloat("CurrentHealth", GetHealthComponent()->GetCurrentHealth());
+}
+

Source/Nakatomi/EnemyCharacter.h

@@ -55,4 +55,7 @@ private:
 	virtual void CalculateHits(TArray<FHitResult>* hits) override;
 
 	virtual void ProcessHits(TArray<FHitResult> hits) override;
+
+protected:
+	virtual void OnDamaged() override;
 };