Section 13: The Enemy Class - Lecture 266

Remove Hit Number

Source/Shooter/Enemy.cpp

@@ -2,6 +2,8 @@
 
 
 #include "Enemy.h"
+
+#include "Blueprint/UserWidget.h"
 #include "Kismet/GameplayStatics.h"
 #include "Sound/SoundCue.h"
 #include "Particles/ParticleSystemComponent.h"
@@ -10,7 +12,11 @@
 AEnemy::AEnemy() :
 	Health(100.f),
 	MaxHealth(100.f),
-	HealthBarDisplayTime(4.f)
+	HealthBarDisplayTime(4.f),
+	HitReactTimeMin(.5f),
+	HitReactTimeMax(1.f),
+	bCanHitReact(true),
+	HitNumberDestroyTime(1.5f)
 {
  	// Set this character to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
 	PrimaryActorTick.bCanEverTick = true;
@@ -31,6 +37,47 @@ void AEnemy::ShowHealthBar_Implementation()
 	GetWorldTimerManager().SetTimer(HealthBarTimer, this, &AEnemy::HideHealthBar, HealthBarDisplayTime);
 }
 
+void AEnemy::Die()
+{
+	HideHealthBar();
+}
+
+void AEnemy::PlayHitMontage(FName Section, float PlayRate)
+{
+	if (!bCanHitReact) return;
+	
+	if (UAnimInstance* AnimInstance = GetMesh()->GetAnimInstance())
+	{
+		AnimInstance->Montage_Play(HitMontage, PlayRate);
+		AnimInstance->Montage_JumpToSection(Section, HitMontage);
+		
+		bCanHitReact = false;
+		const float HitReactTime{ FMath::FRandRange(HitReactTimeMin, HitReactTimeMax) };
+		GetWorldTimerManager().SetTimer(HitReactTimer, this, &AEnemy::ResetHitReactTimer, HitReactTime);
+	}
+}
+
+void AEnemy::ResetHitReactTimer()
+{
+	bCanHitReact = true;
+}
+
+void AEnemy::StoreHitNumber(UUserWidget* HitNumber, FVector Location)
+{
+	HitNumbers.Add(HitNumber, Location);
+
+	FTimerHandle HitNumberTimer;
+	FTimerDelegate HitNumberDelegate;
+	HitNumberDelegate.BindUFunction(this, FName("DestroyHitNumber"), HitNumber);
+	GetWorldTimerManager().SetTimer(HitNumberTimer, HitNumberDelegate, HitNumberDestroyTime, false);
+}
+
+void AEnemy::DestroyHitNumber(UUserWidget* HitNumber)
+{
+	HitNumbers.Remove(HitNumber);
+	HitNumber->RemoveFromParent();
+}
+
 // Called every frame
 void AEnemy::Tick(float DeltaTime)
 {
@@ -58,6 +105,8 @@ void AEnemy::BulletHit_Implementation(FHitResult HitResult)
 	}
 	
 	ShowHealthBar();
+
+	PlayHitMontage(FName("HitReactFront"));
 }
 
 float AEnemy::TakeDamage(float DamageAmount, FDamageEvent const& DamageEvent, AController* EventInstigator,
@@ -68,6 +117,7 @@ float AEnemy::TakeDamage(float DamageAmount, FDamageEvent const& DamageEvent, AC
 	{
 		DamageInflicted = Health; 
 		Health = 0.f;
+		Die();
 	}
 	else
 	{

Source/Shooter/Enemy.h

@@ -9,6 +9,7 @@
 
 class UParticleSystem;
 class USoundCue;
+class UAnimMontage;
 
 UCLASS()
 class SHOOTER_API AEnemy : public ACharacter, public IBulletHitInterface
@@ -29,7 +30,18 @@ protected:
 
 	UFUNCTION(BlueprintImplementableEvent)
 	void HideHealthBar();
-	
+
+	void Die();
+
+	void PlayHitMontage(FName Section, float PlayRate = 1.0f);
+
+	void ResetHitReactTimer();
+
+	UFUNCTION(BlueprintCallable)
+	void StoreHitNumber(UUserWidget* HitNumber, FVector Location);
+
+	UFUNCTION()
+	void DestroyHitNumber(UUserWidget* HitNumber);
 private:
 	/** Particles to spawn when hit by bullets */
 	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Combat, meta = (AllowPrivateAccess = true))
@@ -55,6 +67,28 @@ private:
 	float HealthBarDisplayTime;
 	
 	FTimerHandle HealthBarTimer;
+
+	/** Montage containing Hit and Death animations */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Combat, meta = (AllowPrivateAccess = true))
+	UAnimMontage* HitMontage;
+
+	FTimerHandle HitReactTimer;
+
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Combat, meta = (AllowPrivateAccess = true))
+	float HitReactTimeMin;
+	
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Combat, meta = (AllowPrivateAccess = true))
+	float HitReactTimeMax;
+
+	bool bCanHitReact;
+
+	/** Map to store HitNumber widgets and their hit locations */
+	UPROPERTY(VisibleAnywhere, Category = Combat, meta = (AllowPrivateAccess = true))
+	TMap<UUserWidget*, FVector> HitNumbers;
+
+	/** Time before a hit number is removed from the screen */
+	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Combat, meta = (AllowPrivateAccess = true))
+	float HitNumberDestroyTime;
 public:	
 	// Called every frame
 	virtual void Tick(float DeltaTime) override;
@@ -67,4 +101,7 @@ public:
 	virtual float TakeDamage(float DamageAmount, FDamageEvent const& DamageEvent, AController* EventInstigator, AActor* DamageCauser) override;
 
 	FORCEINLINE FString GetHeadBone() const { return HeadBone; }
+
+	UFUNCTION(BlueprintImplementableEvent)
+	void ShowHitNumber(int32 Damage, FVector HitLocation);
 };

Source/Shooter/GruxAnimInstance.cpp

@@ -0,0 +1,5 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "GruxAnimInstance.h"
+

Source/Shooter/GruxAnimInstance.h

@@ -0,0 +1,17 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "Animation/AnimInstance.h"
+#include "GruxAnimInstance.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class SHOOTER_API UGruxAnimInstance : public UAnimInstance
+{
+	GENERATED_BODY()
+	
+};

Source/Shooter/ShooterCharacter.cpp

@@ -688,7 +688,8 @@ void AShooterCharacter::SendBullet()
 				damageToApply,
 				GetController(), this,
 				UDamageType::StaticClass());
-			UE_LOG(LogTemp, Warning, TEXT("Hit Component: %s"), *BeamHitResult.BoneName.ToString());
+
+			HitEnemy->ShowHitNumber(damageToApply, BeamHitResult.Location);
 		}
 	}
 	else