Create Healthbar UserWidget

Source/Nakatomi/EnemyCharacter.cpp

@@ -8,6 +8,7 @@
 #include "BehaviorTree/BehaviorTree.h"
 #include "BehaviorTree/BlackboardComponent.h"
 #include "BehaviorTree/BlackboardData.h"
+#include "UI/EnemyHealthbarUserWidget.h"
 
 #define COLLISION_WEAPON	ECC_GameTraceChannel1
 
@@ -21,6 +22,12 @@ AEnemyCharacter::AEnemyCharacter(const FObjectInitializer& ObjectInitializer) :
 	GetHealthComponent()->OnDeath.BindUFunction(this, "OnDeath");
 	GetHealthComponent()->SetMaxHealth(100.0f);
 
+	HealthbarWidgetComponent = CreateDefaultSubobject<UWidgetComponent>(TEXT("Healthbar"));
+	HealthbarWidgetComponent->SetupAttachment(RootComponent);
+	HealthbarWidgetComponent->SetRelativeLocation(FVector(0,0,90));
+	HealthbarWidgetComponent->SetTwoSided(true);
+	HealthbarWidgetComponent->SetBackgroundColor(FLinearColor(1,1,1,0));
+	
 	this->Tags.Add(FName("Enemy"));
 }
 
@@ -63,6 +70,12 @@ void AEnemyCharacter::BeginPlay()
 	AEnemyAIController* controller = Cast<AEnemyAIController>(GetController());
 	controller->GetBlackboardComponent()->SetValueAsFloat("CurrentHealth", GetHealthComponent()->GetCurrentHealth());
 	GetHealthComponent()->OnDamaged.BindUFunction(this, "OnDamaged");
+
+	if (HealthbarWidgetComponent->GetWidget())
+	{
+		UEnemyHealthbarUserWidget* healthbar = Cast<UEnemyHealthbarUserWidget>(HealthbarWidgetComponent->GetWidget());
+		healthbar->BindOwner(this);
+	}
 }
 
 void AEnemyCharacter::PlayOnFireAnimations()

Source/Nakatomi/EnemyCharacter.h

@@ -7,6 +7,7 @@
 #include "PatrolRoute.h"
 #include "BehaviorTree/BehaviorTreeComponent.h"
 #include "RandomWeaponParameters.h"
+#include "Components/WidgetComponent.h"
 #include "EnemyCharacter.generated.h"
 
 
@@ -28,6 +29,9 @@ public:
 	UPROPERTY(EditAnywhere)
 	float DefendRadius = 500.0f;
 
+	UPROPERTY(EditAnywhere)
+	UWidgetComponent* HealthbarWidgetComponent;
+	
 private:
 	UPROPERTY(EditDefaultsOnly, Meta = (AllowPrivateAccess = "true"))
 	UBehaviorTree* BehaviourTree;

Source/Nakatomi/UI/EnemyHealthbarUserWidget.cpp

@@ -0,0 +1,26 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "../UI/EnemyHealthbarUserWidget.h"
+
+#include "Nakatomi/EnemyCharacter.h"
+
+void UEnemyHealthbarUserWidget::BindOwner(AEnemyCharacter* NewOwner)
+{
+	Owner = NewOwner;
+	
+	if (Owner)
+	{
+		auto healthComponent = Owner->GetHealthComponent(); 
+		healthComponent->OnDamaged.BindUFunction(this, "UpdateHealthbar");		
+	}
+}
+
+void UEnemyHealthbarUserWidget::UpdateHealthbar()
+{
+	if (Owner)
+	{
+		float percent = Owner->GetHealthComponent()->GetCurrentHealth() / Owner->GetHealthComponent()->GetMaxHealth();
+		Healthbar->SetPercent(percent); 		
+	}
+}

Source/Nakatomi/UI/EnemyHealthbarUserWidget.h

@@ -0,0 +1,34 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Blueprint/UserWidget.h"
+#include "Components/ProgressBar.h"
+#include "Nakatomi/EnemyCharacter.h"
+#include "EnemyHealthbarUserWidget.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class NAKATOMI_API UEnemyHealthbarUserWidget : public UUserWidget
+{
+	GENERATED_BODY()
+
+public:
+
+	UPROPERTY(BlueprintReadWrite, meta = (BindWidget))
+	UProgressBar* Healthbar;
+
+	AEnemyCharacter* Owner;
+
+public:
+
+	void BindOwner(AEnemyCharacter* NewOwner);
+
+private:
+	
+	UFUNCTION()
+	void UpdateHealthbar();
+};