Section 16: Khaimera - Lecture 322

Health Pickup

Source/Shooter/BulletHitInterface.h

@@ -24,5 +24,5 @@ class SHOOTER_API IBulletHitInterface
 public:
 
 	UFUNCTION(BlueprintNativeEvent, BlueprintCallable)
-	void BulletHit(FHitResult HitResult);
+	void BulletHit(FHitResult HitResult, AActor* Shooter, AController* ShooterController);
 };

Source/Shooter/Enemy.cpp

@@ -209,6 +209,8 @@ void AEnemy::AgroSphereOverlap(UPrimitiveComponent* OverlappedComponent, AActor*
 	if (!Character) return;
 
 	// Set the value of the Target blackboard key
+	if (!EnemyController) return;
+	if (!EnemyController->GetBlackboardComponent()) return;
 	EnemyController->GetBlackboardComponent()->SetValueAsObject(TEXT("Target"), Character);
 }
 
@@ -385,7 +387,7 @@ void AEnemy::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
 
 }
 
-void AEnemy::BulletHit_Implementation(FHitResult HitResult)
+void AEnemy::BulletHit_Implementation(FHitResult HitResult, AActor* Shooter, AController* ShooterController)
 {
 	if (ImpactSound)
 	{
@@ -396,19 +398,6 @@ void AEnemy::BulletHit_Implementation(FHitResult HitResult)
 	{
 		UGameplayStatics::SpawnEmitterAtLocation(GetWorld(), ImpactParticles, HitResult.Location, FRotator(0.f), true);
 	}
-
-	if (bDying) return;
-	
-	ShowHealthBar();
-
-	// Determine whether bullet hit stuns
-	const float Stunned = FMath::FRandRange(0.f, 1.f);
-	if (Stunned <= StunChance)
-	{
-		// Stun the Enemy
-		PlayHitMontage(FName("HitReactFront"));
-		SetStunned(true);
-	}
 }
 
 float AEnemy::TakeDamage(float DamageAmount, FDamageEvent const& DamageEvent, AController* EventInstigator,
@@ -431,6 +420,20 @@ float AEnemy::TakeDamage(float DamageAmount, FDamageEvent const& DamageEvent, AC
 	{
 		Health -= DamageAmount;
 	}
+
+	if (bDying) return DamageInflicted;
+	
+	ShowHealthBar();
+
+	// Determine whether bullet hit stuns
+	const float Stunned = FMath::FRandRange(0.f, 1.f);
+	if (Stunned <= StunChance)
+	{
+		// Stun the Enemy
+		PlayHitMontage(FName("HitReactFront"));
+		SetStunned(true);
+	}
+	
 	return DamageInflicted;
 }
 

Source/Shooter/Enemy.h

@@ -249,7 +249,7 @@ public:
 	// Called to bind functionality to input
 	virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;
 
-	virtual void BulletHit_Implementation(FHitResult HitResult) override;
+	virtual void BulletHit_Implementation(FHitResult HitResult, AActor* Shooter, AController* ShooterController) override;
 
 	virtual float TakeDamage(float DamageAmount, FDamageEvent const& DamageEvent, AController* EventInstigator, AActor* DamageCauser) override;
 

Source/Shooter/Explosive.cpp

@@ -2,16 +2,25 @@
 
 
 #include "Explosive.h"
+
+#include "Components/SphereComponent.h"
+#include "GameFramework/Character.h"
 #include "Kismet/GameplayStatics.h"
 #include "Sound/SoundCue.h"
 #include "Particles/ParticleSystemComponent.h"
 
 // Sets default values
-AExplosive::AExplosive()
+AExplosive::AExplosive() :
+	Damage(40.f)
 {
  	// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
 	PrimaryActorTick.bCanEverTick = true;
 
+	ExplosiveMesh = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("ExplosiveMesh"));
+	SetRootComponent(ExplosiveMesh);
+
+	OverlapSphere = CreateDefaultSubobject<USphereComponent>(TEXT("OverlapSphere"));
+	OverlapSphere->SetupAttachment(GetRootComponent());
 }
 
 // Called when the game starts or when spawned
@@ -28,7 +37,7 @@ void AExplosive::Tick(float DeltaTime)
 
 }
 
-void AExplosive::BulletHit_Implementation(FHitResult HitResult)
+void AExplosive::BulletHit_Implementation(FHitResult HitResult, AActor* Shooter, AController* ShooterController)
 {
 	if (ExplosionSound)
 	{
@@ -40,7 +49,14 @@ void AExplosive::BulletHit_Implementation(FHitResult HitResult)
 		UGameplayStatics::SpawnEmitterAtLocation(GetWorld(), ExplosionParticles, HitResult.Location, FRotator(0.f), true);
 	}
 
-	// TODO: Apply explosive damage
+	// Apply explosive damage
+	TArray<AActor*> OverlappingActors;
+	GetOverlappingActors(OverlappingActors, ACharacter::StaticClass());
+
+	for (auto Actor : OverlappingActors)
+	{
+		UGameplayStatics::ApplyDamage(Actor, Damage, ShooterController, Shooter, UDamageType::StaticClass());
+	}
 	
 	Destroy();
 }

Source/Shooter/Explosive.h

@@ -9,6 +9,8 @@
 
 class UParticleSystem;
 class USoundCue;
+class USphereComponent;
+class UStaticMeshComponent;
 
 UCLASS()
 class SHOOTER_API AExplosive : public AActor, public IBulletHitInterface
@@ -33,9 +35,20 @@ private:
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Combat, meta = (AllowPrivateAccess = true))
 	USoundCue* ExplosionSound;
 	
+	/** Mesh for the explosive */
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Combat, meta = (AllowPrivateAccess = true))
+	UStaticMeshComponent* ExplosiveMesh;
+	
+	/** Used to determine what actors overlap during explosion */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Combat, meta = (AllowPrivateAccess = true))
+	USphereComponent* OverlapSphere;
+
+	/** Damage amount for explosive */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Combat, meta = (AllowPrivateAccess = true))
+	float Damage;
 public:	
 	// Called every frame
 	virtual void Tick(float DeltaTime) override;
 
-	virtual void BulletHit_Implementation(FHitResult HitResult) override;
+	virtual void BulletHit_Implementation(FHitResult HitResult, AActor* Shooter, AController* ShooterController) override;
 };

Source/Shooter/ShooterCharacter.cpp

@@ -766,7 +766,7 @@ void AShooterCharacter::SendBullet()
 	{
 		if (IBulletHitInterface* BulletHitInterface = Cast<IBulletHitInterface>(BeamHitResult.GetActor()))
 		{
-			BulletHitInterface->BulletHit_Implementation(BeamHitResult);
+			BulletHitInterface->BulletHit_Implementation(BeamHitResult, this, GetController());
 		}
 		else
 		{