【UE4 塔防游戏系列】07-子弹对敌人造成伤害

**UE4 塔防游戏系列07 - 子弹对敌人造成伤害**

在前面的文章中，我们已经完成了塔的建造、敌人的生成以及子弹的射击。然而，子弹对敌人造成伤害这一环节仍然没有实现。在本篇文章中，我们将重点讨论如何让子弹对敌人造成伤害。

**1. 子弹类的设计**

首先，我们需要定义一个子弹类（Bullet），这个类应该包含以下属性：

* `Position`：子弹的位置* `Velocity`：子弹的速度* `Damage`：子弹对敌人造成的伤害

cpp// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

cpp// Bullet.cpp#include "Bullet.h"
#include "Components/SphereComponent.h"

ABullet::ABullet()
{
 // 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;

 SphereComp = CreateDefaultSubobject(TEXT("SphereComp"));
 RootComponent = SphereComp;
}

void ABullet::BeginPlay()
{
 Super::BeginPlay();
}

void ABullet::Tick(float DeltaTime)
{
 Super::Tick(DeltaTime);
}

cpp// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "true"))
 class USphereComponent* SphereComp;
};

// Bullet.h#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "Components/SphereComponent.h"

UCLASS()
class TOWERDEFENSE_API ABullet : public AActor{
 GENERATED_BODY()

public:
 // Sets default values for this actor's properties ABullet();

protected:
 // Called when the game starts or when spawned virtual void BeginPlay() override;

public:
 // Called every frame virtual void Tick(float DeltaTime) override;

 UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Bullet", meta = (AllowPrivateAccess = "