说明

• 当前的STUBaseWeapon类基本实现了Rifle的逻辑, Launcher无连续射击和瞄准偏离逻辑
  
• 创建STUBaseWeapon的派生类STURifleWeapon和STULauncherWeapon, 把Rifle的逻辑移动到STURifleWeapon, 使STUBaseWeapon成为一个武器意义上的抽象类
  

概览

• 创建派生自STUBaseWeapon的C++类: STURifleWeapon和STULauncherWeapon
  
• 调整STUBaseWeapon逻辑
  
• 将Rifle的逻辑拷贝到STURifleWeapon
  
• 创建基于STURifleWeapon和STULauncherWeapon的蓝图类, 并为之绑定武器模型
  
• 验证Rifle逻辑正常
  

创建派生自STUBaseWeapon的C++类

在内容浏览器选中C++ Classes > ShootThemUp > Public > Weapon > STUBaseWeapon, 右键

调整STUBaseWeapon逻辑

屏蔽连续射击

1. 屏蔽射击定时器和时间间隔
   
2. 将MakeShot声明为虚函数, 定义为空
   
3. 将FireStart和FireStop定义为空
   

屏蔽瞄准偏离

1. 将GetTraceData定义为虚函数, 屏蔽瞄准偏离逻辑
   
2. 屏蔽圆锥偏移角参数
   

屏蔽头文件

Copy1// #include "DrawDebugHelpers.h"
2// #include "TimerManager.h"

将STUBaseWeapon屏蔽的Rifle逻辑拷贝到STURifleWeapon

连续射击

1. 定义射击定时器和时间间隔
   
   ShootThemUp: Weapon/STURifleWeapon.h
   
   • protected
     

     Copy1UPROPERTY(VisibleAnywhere, BlueprintReadWrite)
     2float TimeBetweenShots = 0.1f;

   • private
     

     Copy1FTimerHandle ShotTimerHandle;

2. 覆写虚函数MakeShot
   
   • ShootThemUp: Weapon/STURifleWeapon.h

protected
     

     Copy1virtual void MakeShot() override;

   • ShootThemUp: Weapon/STURifleWeapon.cpp
     

     Copy 1#include "Engine/World.h"
      2#include "DrawDebugHelpers.h"
      3
      4void ASTURifleWeapon::MakeShot()
      5{
      6    if (!GetWorld()) return;
      7
      8    FVector TraceStart, TraceEnd;
      9    if (!GetTraceData(TraceStart, TraceEnd)) return;         
     10
     11    FHitResult HitResult;
     12    MakeHit(HitResult, TraceStart, TraceEnd);
     13
     14    if (HitResult.bBlockingHit)
     15    {
     16        DrawDebugLine(GetWorld(), GetMuzzleWorldLocation(), HitResult.ImpactPoint, FColor::Red, false, 3.0f, 0, 3.0f);
     17        DrawDebugSphere(GetWorld(), HitResult.ImpactPoint, 10.0f, 24, FColor::Red, false, 5.0f);
     18        MakeDamage(HitResult);
     19    }
     20    else
     21    {
     22        DrawDebugLine(GetWorld(), GetMuzzleWorldLocation(), TraceEnd, FColor::Red, false, 3.0f, 0, 3.0f);
     23    }
     24}

3. 覆写FireStart和FireStop
   
   • ShootThemUp: Weapon/STURifleWeapon.h

public
     

     Copy1virtual void FireStart() override;
     2virtual void FireStop() override;

   • ShootThemUp: Weapon/STURifleWeapon.cpp
     

     Copy 1#include "TimerManager.h"
      2
      3void ASTURifleWeapon::FireStart()
      4{
      5    MakeShot();
      6    GetWorldTimerManager().SetTimer(ShotTimerHandle, this, &ASTURifleWeapon::MakeShot, TimeBetweenShots, true);
      7}
      8
      9void ASTURifleWeapon::FireStop()
     10{
     11    GetWorldTimerManager().ClearTimer(ShotTimerHandle);
     12}

瞄准偏离

1. 定义偏移角
   
   protected

ShootThemUp: Weapon/STURifleWeapon.cpp
   

   Copy1UPROPERTY(VisibleAnywhere, BlueprintReadWrite)
   2float BulletSpread = 1.5f;

2. 覆写GetTraceData
   
   • ShootThemUp: Weapon/STURifleWeapon.h

protected
     

     Copy1virtual void GetTraceData(FVector& TraceStart, FVector& TraceEnd) const override;

   • ShootThemUp: Weapon/STURifleWeapon.cpp
     

     Copy 1bool ASTURifleWeapon::GetTraceData(FVector& TraceStart, FVector& TraceEnd) const
      2{
      3    FVector ViewLocation;
      4     FRotator ViewRotation;
      5    if (!GetPlayerViewPoint(ViewLocation, ViewRotation)) return false;
      6
      7    TraceStart = ViewLocation;
      8
      9    const auto HalfRad = FMath::DegreesToRadians(BulletSpread);
     10    const FVector ShootDirection = FMath::VRandCone(ViewRotation.Vector(), HalfRad);
     11
     12    TraceEnd = TraceStart + ShootDirection * TraceMaxDistance;
     13    return true;
     14}

创建基于STURifleWeapon和STULauncherWeapon的蓝图类

保存到Content/Weapon/目录下

测试BP_STURifleWeapon

1. 为BP_STURifleWeapon绑定武器模型Rifle
   
2. 设置游戏角色武器类属性为BP_STURifleWeapon
   
3. 功能正常
   

测试BP_STULauncherWeapon

1. 为BP_STULauncherWeapon绑定武器模型Launcher
   

2. 设置游戏角色武器类属性为BP_STULauncherWeapon
   

3. 武器正常显示, 射击无反应