概览

• 创建武器组件类 STUWeaponComponent
  
• 武器组件负责武器相关逻辑: 将SpawnWeapon移到武器组件
  
• 为游戏角色添加武器组件
  
• 为武器类添加 Fire 接口, 对应扣动扳机逻辑
  
• 为游戏角色绑定鼠标左键, 武器组件提供回调函数 Fire , 调用武器类 Fire 接口
  

初始化武器组件类

创建C++类: Components/STUWeaponComponent

虚幻编辑器

调整框架

C++

ShootThemUp: Components/STUWeaponComponent.h

ShootThemUp: Components/STUWeaponComponent.cpp

将SpawnWeapon逻辑移动到武器组件

C++

在STUWeaponComponent中实现SpawnWeapon

• 添加武器类型属性, 动态创建Actor时使用

  1. ShootThemUp: Components/STUWeaponComponent.h

protected
     

     Copy1class ASTUBaseWeapon;
     2
     3UPROPERTY(EditDefaultsOnly)
     4TSubclassOf<ASTUBaseWeapon> WeaponClass;

  2. ShootThemUp: Components/STUWeaponComponent.cpp
     

     Copy1#include "Weapon/STUBaseWeapon.h"

• 添加变量: 存放挂载点名称

  protected

ShootThemUp: Components/STUWeaponComponent.h
  

  Copy1UPROPERTY(EditDefaultsOnly)
  2FName WeaponAttachPointName = "WeaponSocket";

• 添加变量: 存放武器指针

  private
  
  使用UPROPERTY宏标识, 使得Garbage Collector管理该指针指向的内存
  

  Copy1UPROPERTY()
  2ASTUBaseWeapon *CurrentWeapon = nullptr;

• 添加函数: SpawnWeapon

  1. ShootThemUp: Components/STUWeaponComponent.h

private
     

     Copy1void SpawnWeapon();

  2. ShootThemUp: Components/STUWeaponComponent.cpp
     
     处理不正确则退出: 统一结构, 减少缩进
     

     Copy 1#include "Engine/World.h"
      2#include "Components/SkeletalMeshComponent.h"
      3#include "Weapon/STUBaseWeapon.h"
      4#include "GameFramework/Character.h"
      5
      6void USTUWeaponComponent::SpawnWeapon()
      7{
      8    if (!GetWorld()) return;
      9
     10    ACharacter *Character = Cast<ACharacter>(GetOwner());
     11    if (!Character) return;
     12
     13    CurrentWeapon = GetWorld()->SpawnActor<ASTUBaseWeapon>(WeaponClass);
     14    if (!CurrentWeapon) return;
     15
     16    FAttachmentTransformRules AttachmentRules(EAttachmentRule::SnapToTarget, false);
     17    CurrentWeapon->AttachToComponent(Character->GetMesh(), AttachmentRules, WeaponAttachPointName);
     18}

  3. 武器组件出现在场景中时, 创建并装载武器: 在BeginPlay中调用SpawnWeapon
     

移除STUBaseCharacter中的SpawnWeapon

1. ShootThemUp: Player/STUBaseCharacter.h
   
   • STUBaseWeapon前向声明
     
   • WeaponClass成员
     
   • SpawnWeapon声明
     
2. ShootThemUp: Player/STUBaseCharacter.cpp
   
   • 头文件: STUBaseWeapon, World, SkeletalMeshComponent
     
   • BeginPlay中调用SpawnWeapon
     
   • SpawnWeapon
     

为游戏角色添加武器组件

C++

武器组件是纯逻辑组件, 不用设置上级组件

1. 添加组件
   
   protected

ShootThemUp: Player/STUBaseCharacter.h
   

   Copy1class USTUWeaponComponent;
   2
   3UPROPERTY(VisibleAnywhere, BlueprintReadWrite)
   4USTUWeaponComponent *WeaponComponent;

2. 初始化组件
   
   ShootThemUp: Player/STUBaseCharacter.cpp
   

   Copy1#include "Components/STUWeaponComponent.h"
   2
   3// 构造函数
   4WeaponComponent = CreateDefaultSubobject<USTUWeaponComponent>("WeaponComponent");

查看武器绑定

虚幻编辑器

1. 为武器组件设置武器类型
   
   BP_STUBaseCharacter > Weapon Component > Weapon Class: 设置为BP_STUBaseWeapon
   

2. 效果图: 和之前效果一致
   

   

   
   

实现游戏角色扣动扳机

为游戏角色绑定键位: 点击鼠标左键触发扣动扳机

项目设置 > Engine > Input > Bindings > Action Mappings

武器组件提供回调函数: 调用武器Fire接口

C++

为武器类添加Fire接口

具体类型武器派生自STUBaseWeapon, 各自对Fire的实现不同. 将Fire定义为虚函数, 打印日志

1. ShootThemUp: Weapon/STUBaseWeapon.h

public
   

   Copy1virtual void Fire();

2. ShootThemUp: Weapon/STUBaseWeapon.cpp
   

   Copy1DEFINE_LOG_CATEGORY_STATIC(LogBaseWeapon, All, All);
   2
   3void ASTUBaseWeapon::Fire()
   4{
   5    UE_LOG(LogBaseWeapon, Display, TEXT("Fire!"));
   6}

回调函数

1. ShootThemUp: Components/STUWeaponComponent.h

public
   

   Copy1void Fire();            
   

2. ShootThemUp: Components/STUWeaponComponent.cpp
   

   Copy1void USTUWeaponComponent::Fire()
   2{
   3    if (!CurrentWeapon) return;
   4    CurrentWeapon->Fire();
   5}

绑定绑定函数描述和回调函数

ShootThemUp: Player/STUBaseCharacter.cpp

1. 检查组件初始化
   

   Copy1// BeginPlay
   2check(WeaponComponent);           
   

2. 绑定
   

   Copy1// SetupPlayerInputComponent
   2PlayerInputComponent->BindAction("Fire", IE_Pressed, WeaponComponent, &USTUWeaponComponent::Fire);

查看

点击鼠标左键, 输出日志