虛幻4 ue4 學習筆記pwan篇 1.3D 添加玩家方向控制 通過BindAxis控制前后左右

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Pawn.h"
#include "MyPawn.generated.h"
UCLASS()
class TEST4_API AMyPawn : public APawn
{
    GENERATED_BODY()

public:
    // Sets default values for this pawn's properties
    AMyPawn();

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

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

    // Called to bind functionality to input
    virtual void SetupPlayerInputComponent(class UInputComponent* PlayerInputComponent) override;
    void fire();
    void left(float AxisValue);//左右移動
    void front(float AxisValue);//前后移動

    UParticleSystemComponent* OurParticleSystem;
private:
    int32 coutFire = 0;//計數器 禁止外部對象和子對象訪問
    float RunningTime = 0.0f;

};

cpp主體部分

// Fill out your copyright notice in the Description page of Project Settings.

#include "MyPawn.h"
#include "Runtime/Engine/Classes/Components/BoxComponent.h"
#include "Runtime/Engine/Classes/Components/SphereComponent.h"//    USphereComponent 引用
#include "Runtime/CoreUObject/Public/UObject/ConstructorHelpers.h" // ConstructorHelpers 引用
#include "Runtime/Engine/Classes/Particles/ParticleSystemComponent.h"//UParticleSystemComponent 引用
#include "Runtime/Engine/Classes/GameFramework/SpringArmComponent.h"//UStaticMeshComponent 引用
#include "Runtime/Engine/Classes/Camera/CameraComponent.h"//UCameraComponent 引用
#include "string"
using namespace std;
// Sets default values
AMyPawn::AMyPawn()
{
     // Set this pawn to call Tick() every frame.  You can turn this off to improve performance if you don't need it.
    PrimaryActorTick.bCanEverTick = true;
    AutoPossessPlayer = EAutoReceiveInput::Player0;//這行代碼不加 無法實現用戶操作 此時用戶視角就是當前pawn視角

    USphereComponent * SphereComponent = CreateDefaultSubobject<USphereComponent>("RootComponent");
    RootComponent = SphereComponent;//這里不一定非要用物體組件
    

    
//    創建靜態網格物體
    UStaticMeshComponent * SphereVisual = CreateDefaultSubobject<UStaticMeshComponent>("VisualRepresentation");
    SphereVisual->SetupAttachment(RootComponent);
    
    //打開素材庫
    static ConstructorHelpers::FObjectFinder<UStaticMesh> SphereVisualAssetWzh(TEXT("/Game/StarterContent/Shapes/Shape_Sphere.Shape_Sphere"));
    if (SphereVisualAssetWzh.Succeeded()) {
        SphereVisual->SetStaticMesh(SphereVisualAssetWzh.Object);
        SphereVisual->SetRelativeLocation(FVector(0.0f, 0.0f, -40.0f));//設置位置0,0,0為初始位置                                               
        SphereVisual->SetWorldScale3D(FVector(0.8f));//SetWorldScale3D 設置組件在世界空間中的變換倍數。 倍數以原來模型大小為基准
    }

    // 創建一個可啟用或停用的粒子系統
    OurParticleSystem = CreateDefaultSubobject<UParticleSystemComponent>(TEXT("MovementParticles"));
    OurParticleSystem->SetupAttachment(RootComponent);//直接將粒子系統添加到根組件上
    OurParticleSystem->bAutoActivate = false;//在場景中激活

    OurParticleSystem->SetRelativeLocation(FVector(-20.0f, 0.0f, 20.0f));
    OurParticleSystem->SetWorldScale3D(FVector(3.0f));//SetWorldScale3D 設置組件在世界空間中的變換倍數。 倍數以原來模型大小為基准
    static ConstructorHelpers::FObjectFinder<UParticleSystem> ParticleAsset(TEXT("/Game/StarterContent/Particles/P_Fire.P_Fire"));
    if (ParticleAsset.Succeeded())
    {
        OurParticleSystem->SetTemplate(ParticleAsset.Object);
    }


    //加入個攝像頭讓視角看起來舒服點 當然不加也是可以看到 
    UCameraComponent* Camera = CreateDefaultSubobject<UCameraComponent>(TEXT("ActualCamera"));
    Camera->SetupAttachment(RootComponent);
    Camera->SetRelativeLocation(FVector(-250.f, 0.0f, 400));//設置位置0,0,0為初始位置    
    Camera->RelativeRotation = FRotator(-45.f, 0.f, 0.f);// y z x順序旋轉  一個旋轉信息的容器 所有旋轉值都以度數存儲。
}

// Called when the game starts or when spawned
void AMyPawn::BeginPlay()
{
    Super::BeginPlay();

    
}

// Called every frame
void AMyPawn::Tick(float DeltaTime)//沒兩幀之間的時間間隔
{
    Super::Tick(DeltaTime);    

    /*    string print = " DeltaTime = " + to_string(DeltaTime);
        FString print2(print.c_str());

        if (GEngine)
        {
            GEngine->AddOnScreenDebugMessage(-1, 1, FColor::Red, print2);
        }

    FVector NewLocation = GetActorLocation();//得到當前位置
    float DeltaHeight = FMath::Sin(RunningTime);
    NewLocation.Z += DeltaHeight;
    RunningTime += DeltaTime;
    RootComponent->SetRelativeLocation(NewLocation);//設置位置0,0,0為初始位置*/
    //this->SetActorLocation(NewLocation);//官方使用的是這行代碼來移動位置的 同上行代碼


}

// Called to bind functionality to input
void AMyPawn::SetupPlayerInputComponent(UInputComponent* PlayerInputComponent)
{
    Super::SetupPlayerInputComponent(PlayerInputComponent);
    PlayerInputComponent->BindAction("fire", IE_Released, this, &AMyPawn::fire);
    InputComponent->BindAxis("left", this, &AMyPawn::left);
    InputComponent->BindAxis("front", this, &AMyPawn::front);
}


void AMyPawn::fire() {
        coutFire = !coutFire;    
    if (GEngine)
    {
        GEngine->AddOnScreenDebugMessage(-1, 0.2, FColor::Red, TEXT("火焰！"));

        int32 active32 = OurParticleSystem->bIsActive;
        //OurParticleSystem->ToggleActive(); //官方使用的ToggleActive()切換粒子狀態 我建議不要使用這個函數 因為
        //在快速按下鍵盤按鍵 調用事件函數fire時 無法執行里面的ToggleActive函數 但是可以打印文字“火焰“ 但是慢慢按就沒問題
        //我發現主要是 ToggleActive內部操作 bIsActive的問題 如果快速按下 bIsActive 就不會重新賦值 而是一直為1估計是虛幻4官方的bug, 慢慢按 才為0 我自己重新 定義一個外部變量coutFire 計數代替bIsActive 就沒問題了不用ToggleActive實現
        OurParticleSystem->SetActive(coutFire);//通過計數器 切換狀態
    }

}

void AMyPawn::left(float AxisValue) {
    FVector NewLocation = GetActorLocation();//得到當前位置
    if (AxisValue == 1) {
        if (GEngine)GEngine->AddOnScreenDebugMessage(-1, 0.2, FColor::Red, TEXT("向左！"));
            NewLocation.Y -= 1.0;
    
        
    }
    else if (AxisValue == -1) {
        if (GEngine)GEngine->AddOnScreenDebugMessage(-1, 0.2, FColor::Red, TEXT("向右！"));
        NewLocation.Y += 1.0;
    }

    RootComponent->SetRelativeLocation(NewLocation);//設置位置0,0,0為初始位置*/
    //this->SetActorLocation(NewLocation);//官方使用的是這行代碼來移動位置的 同上行代碼
}

void AMyPawn::front(float AxisValue) {
    FVector NewLocation = GetActorLocation();//得到當前位置
    if (AxisValue == 1) {
        if (GEngine)GEngine->AddOnScreenDebugMessage(-1, 0.2, FColor::Red, TEXT("向前！"));
        NewLocation.X += 1.0;

    }
    else if (AxisValue == -1) {
        if (GEngine)GEngine->AddOnScreenDebugMessage(-1, 0.2, FColor::Red, TEXT("向后！"));
        NewLocation.X -= 1.0;
    }
    RootComponent->SetRelativeLocation(NewLocation);//設置位置0,0,0為初始位置*/
    //this->SetActorLocation(NewLocation);//官方使用的是這行代碼來移動位置的 同上行代碼
}