说明

• 榴弹发生碰撞时对爆炸半径内Actor造成伤害
  
• 可以在榴弹发射器中定义伤害相关参数, 如ShotDirection那样对榴弹进行设置; 选择直接在榴弹类中定义
  

概览

• 重构武器
  
• 注册碰撞委托, 在处理函数中对伤害半径内Actor造成伤害
  

重构武器

可配置参数的蓝图属性为EditDefaultsOnly

1. ShootThemUp: Weapon/STUBaseWeapon.h
   
   VisiableAnywhere -> EditDefaultsOnly
   

   -
   DamageAmount
   TraceMaxDistance
   MuzzleSocketName

2. ShootThemUp: Weapon/STURifleWeapon.h
   
   VisiableAnywhere -> EditDefaultsOnly
   

   -
   TimeBetweenShots
   BulletSpread

组件在原型和实例中均可见

VisibleDefaultsOnly -> VisibleAnywhere

ShootThemUp: Weapon/STUProjectile.h

-
CollisionComponent
MovementComponent

ASTUBaseWeapon::MakeDamage是STURifleWeapon的专属逻辑

将ASTUBaseWeapon::MakeDamage移动到Rifle

1. 移动数据成员
   
   ShootThemUp: Weapon/STUBaseWeapon.h -> ShootThemUp: Weapon/STURifleWeapon.h
   

   Copy1UPROPERTY(EditDefaultsOnly, BlueprintReadWrite)
   2float DamageAmount = 10.0f;

2. 移动函数声明
   
   ShootThemUp: Weapon/STUBaseWeapon.h -> ShootThemUp: Weapon/STURifleWeapon.h

protected
   

   Copy1void MakeDamage(const FHitResult& HitResult);                    
   

3. 移动函数定义
   
   ShootThemUp: Weapon/STUBaseWeapon.cpp
   

   Copy1void ASTUBaseWeapon::MakeDamage(const FHitResult &HitResult)
   2{
   3    const auto DamagedActor = HitResult.GetActor();
   4    if (!DamagedActor) return;
   5    DamagedActor->TakeDamage(DamageAmount, FDamageEvent(), GetPlayerController(), this);
   6}

   ShootThemUp: Weapon/STURifleWeapon.cpp
   

   Copy1#include "GameFramework/PlayerController.h" // TakeDamage的参数是AController
   2
   3void ASTURifleWeapon::MakeDamage(const FHitResult &HitResult)
   4{
   5    const auto DamagedActor = HitResult.GetActor();
   6    if (!DamagedActor) return;
   7    DamagedActor->TakeDamage(DamageAmount, FDamageEvent(), GetPlayerController(), this);
   8}

将榴弹延时销毁逻辑从榴弹发射器类移动到榴弹类, 并添加参数

1. 添加数据成员
   
   protected

ShootThemUp: Weapon/STUProjectile.h
   

   Copy1UPROPERTY(EditDefaultsOnly, BlueprintReadWrite)
   2float LifeSeconds = 5.0f;

2. 在BeginPlay中销毁榴弹
   
   ShootThemUp: Weapon/STUProjectile.cpp
   

   Copy1SetLifeSpan(LifeSeconds);           
   

3. 屏蔽榴弹发射器中的销毁逻辑
   
   ShootThemUp: Weapon/STULauncherWeapon.cpp
   

榴弹发生碰撞时, 对半径内Actor造成伤害

1. 注册碰撞委托, 调用处理函数
   
2. 处理函数中, 绘制爆炸半径, 并对半径内Actor造成伤害, 参照STUDevDamageActor
   
   ShootThemUp: Dev/STUDevDamageActor.cpp
   

注册碰撞委托

给出处理函数声明, 根据委托定义

1. 委托定义
   
   UE_5.1/Engine/Source/Runtime/Engine/Classes/Components/PrimitiveComponent.h 184
   

   Copy1DECLARE_DYNAMIC_MULTICAST_SPARSE_DELEGATE_FiveParams( FComponentHitSignature, UPrimitiveComponent, OnComponentHit, UPrimitiveComponent*, HitComponent, AActor*, OtherActor, UPrimitiveComponent*, OtherComp, FVector, NormalImpulse, const FHitResult&, Hit );

2. 处理函数声明
   
   private

ShootThemUp: Weapon/STUProjectile.h
   

   Copy1UFUNCTION()
   2void OnProjectileHit(UPrimitiveComponent* HitComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit);

3. 给出空定义
   
   ShootThemUp: Weapon/STUProjectile.cpp
   

   Copy1void ASTUProjectile::OnProjectileHit(UPrimitiveComponent* HitComponent, AActor* OtherActor, UPrimitiveComponent* OtherComp, FVector NormalImpulse, const FHitResult& Hit) {}

注册委托

1. 委托成员
   
   UE_5.1/Engine/Source/Runtime/Engine/Classes/Components/PrimitiveComponent.h 1189
   

   Copy 1/** 
    2 *	Event called when a component hits (or is hit by) something solid. This could happen due to things like Character movement, using Set Location with 'sweep' enabled, or physics simulation.
    3 *	For events when objects overlap (e.g. walking into a trigger) see the 'Overlap' event.
    4 *
    5 *	@note For collisions during physics simulation to generate hit events, 'Simulation Generates Hit Events' must be enabled for this component.
    6 *	@note When receiving a hit from another object's movement, the directions of 'Hit.Normal' and 'Hit.ImpactNormal'
    7 *	will be adjusted to indicate force from the other object against this object.
    8 *	@note NormalImpulse will be filled in for physics-simulating bodies, but will be zero for swept-component blocking collisions.
    9 */
   10UPROPERTY(BlueprintAssignable, Category="Collision")
   11FComponentHitSignature OnComponentHit;

2. 注册委托
   
   ShootThemUp: Weapon/STUProjectile.cpp
   

   Copy1// BeginPlay
   2
   3check(CollisionComponent);
   4
   5CollisionComponent->OnComponentHit.AddDynamic(this, &ASTUProjectile::OnProjectileHit);

为榴弹设置上级

1. 动态生成榴弹对象时, 设置上级为游戏角色
   
2. 不对发射榴弹的游戏角色造成伤害
   
3. 不与发射榴弹的游戏角色发生碰撞
   

ShootThemUp: Weapon/STULauncherWeapon.cpp

Copy1Projectile->SetOwner(GetOwner());

设置碰撞组件

ShootThemUp: Weapon/STUProjectile.cpp

1. 仅在计算轨迹时发生碰撞
   

   Copy1// Constructor
   2CollisionComponent->SetCollisionEnabled(ECollisionEnabled::QueryOnly);

2. 和所有通道发生碰撞
   

   Copy1// Constructor
   2CollisionComponent->SetCollisionResponseToAllChannels(ECollisionResponse::ECR_Block);                 
   

3. 不与发射榴弹的游戏角色发生碰撞
   

   Copy1// BeginPlay
   2 CollisionComponent->IgnoreActorWhenMoving(GetOwner(), true);

实现处理函数: 对爆炸半径内Actor造成伤害

伤害参数

-
伤害半径	DamageRadius
伤害数值	DamageAmount
伤害计算模型	DoFullDamage
伤害来源
忽略Actor列表

添加数据成员, 存放伤害参数

protected

ShootThemUp: Weapon/STUProjectile.h

Copy1UPROPERTY(EditDefaultsOnly, BlueprintReadWrite)
2float DamageRadius = 200.0f;
3
4UPROPERTY(EditDefaultsOnly, BlueprintReadWrite)
5float DamageAmount = 50.0f;
6
7UPROPERTY(EditDefaultsOnly, BlueprintReadWrite)
8bool DoFullDamage = false;

实现函数, 返回游戏角色控制器

1. ShootThemUp: Weapon/STUProjectile.h

private
   

   Copy1AController* GetController() const;

2. ShootThemUp: Weapon/STUProjectile.cpp
   

   Copy1AController* ASTUProjectile::GetController() const
   2{
   3    const auto Pawn = Cast<APawn>(GetOwner());
   4    return Pawn ? Pawn->GetController() : nullptr;
   5}

实现处理函数

ShootThemUp: Weapon/STUProjectile.cpp

1. 发生碰撞时, 榴弹不再运动
   
   通过将运动速度设为0实现; 联想到游戏角色死亡后调用DisableMovement
   

   Copy1MovementComponent->StopMovementImmediately();

2. 绘制爆炸范围
   

   Copy 1#include "DrawDebugHelpers.h"
    2
    3if (!GetWorld()) return;
    4DrawDebugSphere(GetWorld(),
    5                GetActorLocation(),
    6                DamageRadius,
    7                24,
    8                FColor::Red,
    9                false,
   10                5.0f);

3. 对爆炸半径内Actor造成伤害
   
   排除榴弹上级
   

   Copy1#include "Kismet/GameplayStatics.h"
   2#include "GameFramework/DamageType.h"
   3
   4UGameplayStatics::ApplyRadialDamage(GetWorld(), DamageAmount, GetActorLocation(), DamageRadius, UDamageType::StaticClass(), { GetOwner() }, this, GetController(), DoFullDamage);            
   

4. 销毁榴弹对象
   

   Copy1Destroy();

查看

1. 无法伤害自己: 打地上
   

   

   
   

2. 根据到球心的距离造成伤害
   

   

   
   

3. 对处在爆炸半径内的游戏角色, 同时造成伤害