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Source/first/Variant_Shooter/Weapons/ShooterProjectile.h

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+// Copyright Epic Games, Inc. All Rights Reserved.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "GameFramework/Actor.h"
+#include "ShooterProjectile.generated.h"
+
+class USphereComponent;
+class UProjectileMovementComponent;
+class ACharacter;
+class UPrimitiveComponent;
+
+/**
+ *  Simple projectile class for a first person shooter game
+ */
+UCLASS(abstract)
+class FIRST_API AShooterProjectile : public AActor
+{
+	GENERATED_BODY()
+	
+	/** Provides collision detection for the projectile */
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components", meta = (AllowPrivateAccess = "true"))
+	USphereComponent* CollisionComponent;
+
+	/** Handles movement for the projectile */
+	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category="Components", meta = (AllowPrivateAccess = "true"))
+	UProjectileMovementComponent* ProjectileMovement;
+
+protected:
+
+	/** Loudness of the AI perception noise done by this projectile on hit */
+	UPROPERTY(EditAnywhere, Category="Projectile|Noise", meta = (ClampMin = 0, ClampMax = 100))
+	float NoiseLoudness = 3.0f;
+
+	/** Range of the AI perception noise done by this projectile on hit */
+	UPROPERTY(EditAnywhere, Category="Projectile|Noise", meta = (ClampMin = 0, ClampMax = 100000, Units = "cm"))
+	float NoiseRange = 3000.0f;
+
+	/** Tag of the AI perception noise done by this projectile on hit */
+	UPROPERTY(EditAnywhere, Category="Noise")
+	FName NoiseTag = FName("Projectile");
+
+	/** Physics force to apply on hit */
+	UPROPERTY(EditAnywhere, Category="Projectile|Hit", meta = (ClampMin = 0, ClampMax = 50000))
+	float PhysicsForce = 100.0f;
+
+	/** Damage to apply on hit */
+	UPROPERTY(EditAnywhere, Category="Projectile|Hit", meta = (ClampMin = 0, ClampMax = 100))
+	float HitDamage = 25.0f;
+
+	/** Type of damage to apply. Can be used to represent specific types of damage such as fire, explosion, etc. */
+	UPROPERTY(EditAnywhere, Category="Projectile|Hit")
+	TSubclassOf<UDamageType> HitDamageType;
+
+	/** If true, the projectile can damage the character that shot it */
+	UPROPERTY(EditAnywhere, Category="Projectile|Hit")
+	bool bDamageOwner = false;
+
+	/** If true, the projectile will explode and apply radial damage to all actors in range */
+	UPROPERTY(EditAnywhere, Category="Projectile|Explosion")
+	bool bExplodeOnHit = false;
+
+	/** Max distance for actors to be affected by explosion damage */
+	UPROPERTY(EditAnywhere, Category="Projectile|Explosion", meta = (ClampMin = 0, ClampMax = 5000, Units = "cm"))
+	float ExplosionRadius = 500.0f;	
+
+	/** If true, this projectile has already hit another surface */
+	bool bHit = false;
+
+	/** How long to wait after a hit before destroying this projectile */
+	UPROPERTY(EditAnywhere, Category="Projectile|Destruction", meta = (ClampMin = 0, ClampMax = 10, Units = "s"))
+	float DeferredDestructionTime = 5.0f;
+
+	/** Timer to handle deferred destruction of this projectile */
+	FTimerHandle DestructionTimer;
+
+public:	
+
+	/** Constructor */
+	AShooterProjectile();
+
+protected:
+	
+	/** Gameplay initialization */
+	virtual void BeginPlay() override;
+
+	/** Gameplay cleanup */
+	virtual void EndPlay(EEndPlayReason::Type EndPlayReason) override;
+
+	/** Handles collision */
+	virtual void NotifyHit(class UPrimitiveComponent* MyComp, AActor* Other, UPrimitiveComponent* OtherComp, bool bSelfMoved, FVector HitLocation, FVector HitNormal, FVector NormalImpulse, const FHitResult& Hit) override;
+
+protected:
+
+	/** Looks up actors within the explosion radius and damages them */
+	void ExplosionCheck(const FVector& ExplosionCenter);
+
+	/** Processes a projectile hit for the given actor */
+	void ProcessHit(AActor* HitActor, UPrimitiveComponent* HitComp, const FVector& HitLocation, const FVector& HitDirection);
+
+	/** Passes control to Blueprint to implement any effects on hit. */
+	UFUNCTION(BlueprintImplementableEvent, Category="Projectile", meta = (DisplayName = "On Projectile Hit"))
+	void BP_OnProjectileHit(const FHitResult& Hit);
+
+	/** Called from the destruction timer to destroy this projectile */
+	void OnDeferredDestruction();
+
+};