概览

• 为HeroTPP添加Socket, 在背后挂载未使用武器
  
• 绑定键位, 按下Tab或滚动鼠标时切换武器
  
• 游戏角色死亡后, 销毁武器
  
• 处理Rifle开火定时器
  

为骨骼网格体添加Socket

虚幻编辑器

1. 打开Content/ExternalContent/Animation/Characters/HeroTPP/HeroTPP
   

2. 选择骨骼b_Spine1, 添加Socket
   

3. 在细节面板设置Socket
   

   -
   Socket Name	ArmorySocket
   Relative Location	(-9, -26, -23)
   Relative Rotation	(-10, 70, -29)

   

   
   

4. 为Socket添加预览资产, 选择Launcher
   

   武器未使用时背在背上
   

   

   
   

绑定切换武器键位

项目设置 > Engine > Input > Action Mappings

-
函数描述	NextWeapon
键位	Tab / MouseWheelUp / MouseWheelDown

不论滚轮方向, 切换到下一个武器

搭建框架

切换逻辑在STUWeaponComponent中

添加空的回调函数

• ShootThemUp: Components/STUWeaponComponent.h

public
  

  Copy1void NextWeapon();

• ShootThemUp: Components/STUWeaponComponent.cpp
  

  Copy1void USTUWeaponComponent::NextWeapon()
  2{ }

绑定回调函数和函数描述

ShootThemUp: Player/STUBaseCharacter.cpp

Copy1// SetupPlayerInputComponent
2
3PlayerInputComponent->BindAction("NextWeapon", IE_Pressed, WeaponComponent, &USTUWeaponComponent::NextWeapon);

调整当前逻辑

修改Socket名

现在附加武器的Socket有两个, 原先的Socket为装载武器Socket

• ShootThemUp: Components/STUWeaponComponent.h
  
  WeaponAttachPointName -> WeaponEquipSocketName
  
• ShootThemUp: Components/STUWeaponComponent.cpp
  

  Copy1// SpawnWeapon
  2WeaponAttachPointName -> WeaponEquipSocketName          
  

添加接口: 将武器挂载到指定Socket

切换武器时使用

定义

• ShootThemUp: Components/STUWeaponComponent.h

private
  

  Copy1void AttachWeaponToSocket(ASTUBaseWeapon *Weapon, USceneComponent *SceneComponent, const FName &SocketName);

• ShootThemUp: Components/STUWeaponComponent.cpp
  

  Copy1void USTUWeaponComponent::AttachWeaponToSocket(ASTUBaseWeapon *Weapon, USceneComponent *SceneComponent, const FName &SocketName)
  2{
  3    if (!Weapon || !SceneComponent) return;
  4    FAttachmentTransformRules AttachmentRules(EAttachmentRule::SnapToTarget, false);
  5    Weapon->AttachToComponent(SceneComponent, AttachmentRules, SocketName);               
  6}

调用

ShootThemUp: Components/STUWeaponComponent.cpp

Copy1// SpawnWeapon
2AttachWeaponToSocket(CurrentWeapon, Character->GetMesh(), WeaponEquipSocketName);           

武器数组

武器组件管理武器数组

将武器类属性改为武器类属性数组

protected

ShootThemUp: Components/STUWeaponComponent.h

Copy1UPROPERTY(EditDefaultsOnly)
2TArray<TSubclassOf<ASTUBaseWeapon>> WeaponClasses;

添加武器数组

private

ShootThemUp: Components/STUWeaponComponent.h

Copy1UPROPERTY()
2TArray<ASTUBaseWeapon*> Weapons;

添加数据成员: 保存挂载点名称

protected

ShootThemUp: Components/STUWeaponComponent.h

Copy1UPROPERTY(EditDefaultsOnly)
2FName WeaponArmorySocketName = "ArmorySocket";

动态生成武器时, 生成Rifle和Launcher, 先全部挂载到背上

SpawnWeapons定义

• ShootThemUp: Components/STUWeaponComponent.h
  
  SpawnWeapon -> SpawnWeapons
  
• ShootThemUp: Components/STUWeaponComponent.cpp
  

  Copy 1void USTUWeaponComponent::SpawnWeapons()
   2{
   3    if (!GetWorld()) return;
   4
   5    ACharacter *Character = Cast<ACharacter>(GetOwner());
   6    if (!Character) return;
   7
   8    for (auto WeaponClass : WeaponClasses)
   9    {
  10        auto Weapon = GetWorld()->SpawnActor<ASTUBaseWeapon>(WeaponClass);
  11        if (!Weapon) return;
  12        Weapons.Add(Weapon);
  13        Weapon->SetOwner(Character);
  14        AttachWeaponToSocket(Weapon, Character->GetMesh(), WeaponArmorySocketName);
  15    }
  16}

在BeginPlay中调用

ShootThemUp: Components/STUWeaponComponent.cpp

装载武器

添加数据成员: 保存当前武器标号

private

和CurrentWeapon相对应

ShootThemUp: Components/STUWeaponComponent.h

Copy1int32 CurrentWeaponIndex = 0;

EquipWeapon定义

• ShootThemUp: Components/STUWeaponComponent.h

private
  

  Copy1void EquipWeapon(int32 WeaponIndex);

• ShootThemUp: Components/STUWeaponComponent.cpp
  
  设置CurrentWeapon指针, 将武器挂载到WeaponEquipSocketName
  

  Copy 1void USTUWeaponComponent::EquipWeapon(int32 WeaponIndex)
   2{
   3    ACharacter *Character = Cast<ACharacter>(GetOwner());
   4    if (!Character) return;
   5
   6    if (CurrentWeapon)
   7    {
   8        AttachWeaponToSocket(CurrentWeapon, Character->GetMesh(), WeaponArmorySocketName);               
   9    }
  10
  11    CurrentWeapon = Weapons[WeaponIndex];
  12    AttachWeaponToSocket(CurrentWeapon, Character->GetMesh(), WeaponEquipSocketName);
  13}

动态生成武器后, 需装载武器

ShootThemUp: Components/STUWeaponComponent.cpp

Copy1// BeginPlay
2
3CurrentWeaponIndex = 0;
4EquipWeapon(CurrentWeaponIndex);

实现切换武器回调函数

ShootThemUp: Components/STUWeaponComponent.cpp

Copy1void USTUWeaponComponent::NextWeapon()
2{
3    CurrentWeaponIndex = (1 + CurrentWeaponIndex) % Weapons.Num();
4    EquipWeapon(CurrentWeaponIndex);
5}

查看

1. 设置游戏角色武器类属性数组
   

   

   
   

2. 武器切换和使用正常
   

   

   
   

游戏角色死亡时, 销毁武器

• 对游戏角色调用Destroy, 会对游戏角色调用EndPlay
  
• 先调用组件的EndPlay, 再对游戏角色调用EndPlay
  
• 覆写EndPlay, 销毁武器Actor
  

ShootThemUp: Components/STUWeaponComponent.h

protected

Copy1virtual void EndPlay(const EEndPlayReason::Type EndPlayReason) override;

ShootThemUp: Components/STUWeaponComponent.cpp

Copy 1void USTUWeaponComponent::EndPlay(const EEndPlayReason::Type EndPlayReason)
 2{
 3    CurrentWeapon = nullptr;
 4    for (auto Weapon : Weapons)
 5    {
 6        // 卸载Actor的网格体, 与AttachToComponent相反
 7        Weapon->DetachFromActor(FDetachmentTransformRules::KeepWorldTransform); // 此处是静态结构体, 不是枚举成员
 8
 9        // 销毁Actor
10        Weapon->Destroy();
11    }
12    Weapons.Empty(); // 清空数组
13
14    // 也可以关闭武器的物理碰撞, 将武器保留在关卡, 几秒钟后销毁武器
15    Super::EndPlay(EndPlayReason);
16}

处理Rifle开火定时器

切换武器时, 关闭定时器

ShootThemUp: Components/STUWeaponComponent.cpp

Copy1// EquipWeapon
2
3 if (CurrentWeapon)
4 {
5     // 其他处理
6     CurrentWeapon->FireStop();
7 }

游戏角色死亡后, 关闭定时器

ShootThemUp: Player/STUBaseCharacter.cpp

Copy1// OnDeath
2WeaponComponent->FireStop();