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Source/first/Variant_Shooter/AI/ShooterNPC.h

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+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "firstCharacter.h"
+#include "ShooterWeaponHolder.h"
+#include "ShooterNPC.generated.h"
+
+DECLARE_DYNAMIC_MULTICAST_DELEGATE(FPawnDeathDelegate);
+
+class AShooterWeapon;
+
+/**
+ *  A simple AI-controlled shooter game NPC
+ *  Executes its behavior through a StateTree managed by its AI Controller
+ *  Holds and manages a weapon
+ */
+UCLASS(abstract)
+class FIRST_API AShooterNPC : public AfirstCharacter, public IShooterWeaponHolder
+{
+	GENERATED_BODY()
+
+public:
+
+	/** Current HP for this character. It dies if it reaches zero through damage */
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category="Damage")
+	float CurrentHP = 100.0f;
+
+protected:
+
+	/** Name of the collision profile to use during ragdoll death */
+	UPROPERTY(EditAnywhere, Category="Damage")
+	FName RagdollCollisionProfile = FName("Ragdoll");
+
+	/** Time to wait after death before destroying this actor */
+	UPROPERTY(EditAnywhere, Category="Damage")
+	float DeferredDestructionTime = 5.0f;
+
+	/** Team byte for this character */
+	UPROPERTY(EditAnywhere, Category="Team")
+	uint8 TeamByte = 1;
+
+	/** Pointer to the equipped weapon */
+	TObjectPtr<AShooterWeapon> Weapon;
+
+	/** Type of weapon to spawn for this character */
+	UPROPERTY(EditAnywhere, Category="Weapon")
+	TSubclassOf<AShooterWeapon> WeaponClass;
+
+	/** Name of the first person mesh weapon socket */
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category ="Weapons")
+	FName FirstPersonWeaponSocket = FName("HandGrip_R");
+
+	/** Name of the third person mesh weapon socket */
+	UPROPERTY(EditAnywhere, BlueprintReadOnly, Category ="Weapons")
+	FName ThirdPersonWeaponSocket = FName("HandGrip_R");
+
+	/** Max range for aiming calculations */
+	UPROPERTY(EditAnywhere, Category="Aim")
+	float AimRange = 10000.0f;
+
+	/** Cone variance to apply while aiming */
+	UPROPERTY(EditAnywhere, Category="Aim")
+	float AimVarianceHalfAngle = 10.0f;
+
+	/** Minimum vertical offset from the target center to apply when aiming */
+	UPROPERTY(EditAnywhere, Category="Aim")
+	float MinAimOffsetZ = -35.0f;
+
+	/** Maximum vertical offset from the target center to apply when aiming */
+	UPROPERTY(EditAnywhere, Category="Aim")
+	float MaxAimOffsetZ = -60.0f;
+
+	/** Actor currently being targeted */
+	TObjectPtr<AActor> CurrentAimTarget;
+
+	/** If true, this character is currently shooting its weapon */
+	bool bIsShooting = false;
+
+	/** If true, this character has already died */
+	bool bIsDead = false;
+
+	/** Deferred destruction on death timer */
+	FTimerHandle DeathTimer;
+
+public:
+
+	/** Delegate called when this NPC dies */
+	FPawnDeathDelegate OnPawnDeath;
+
+protected:
+
+	/** Gameplay initialization */
+	virtual void BeginPlay() override;
+
+	/** Gameplay cleanup */
+	virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;
+
+public:
+
+	/** Handle incoming damage */
+	virtual float TakeDamage(float Damage, struct FDamageEvent const& DamageEvent, AController* EventInstigator, AActor* DamageCauser) override;
+
+public:
+
+	//~Begin IShooterWeaponHolder interface
+
+	/** Attaches a weapon's meshes to the owner */
+	virtual void AttachWeaponMeshes(AShooterWeapon* Weapon) override;
+
+	/** Plays the firing montage for the weapon */
+	virtual void PlayFiringMontage(UAnimMontage* Montage) override;
+
+	/** Applies weapon recoil to the owner */
+	virtual void AddWeaponRecoil(float Recoil) override;
+
+	/** Updates the weapon's HUD with the current ammo count */
+	virtual void UpdateWeaponHUD(int32 CurrentAmmo, int32 MagazineSize) override;
+
+	/** Calculates and returns the aim location for the weapon */
+	virtual FVector GetWeaponTargetLocation() override;
+
+	/** Gives a weapon of this class to the owner */
+	virtual void AddWeaponClass(const TSubclassOf<AShooterWeapon>& WeaponClass) override;
+
+	/** Activates the passed weapon */
+	virtual void OnWeaponActivated(AShooterWeapon* Weapon) override;
+
+	/** Deactivates the passed weapon */
+	virtual void OnWeaponDeactivated(AShooterWeapon* Weapon) override;
+
+	/** Notifies the owner that the weapon cooldown has expired and it's ready to shoot again */
+	virtual void OnSemiWeaponRefire() override;
+
+	//~End IShooterWeaponHolder interface
+
+protected:
+
+	/** Called when HP is depleted and the character should die */
+	void Die();
+
+	/** Called after death to destroy the actor */
+	void DeferredDestruction();
+
+public:
+
+	/** Signals this character to start shooting at the passed actor */
+	void StartShooting(AActor* ActorToShoot);
+
+	/** Signals this character to stop shooting */
+	void StopShooting();
+};