UE4_代理示例_时钟

时钟

TimeOfDayHandler

  注册代理，执行代理

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// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "GameFramework/Actor.h"#include "TimeOfDayHandler.generated.h"// 定义了带有两个参数的代理，FOnTimeChangedSignatureDECLARE_MULTICAST_DELEGATE_TwoParams(FOnTimeChangedSignature, int32, int32)UCLASS()class BLANKUECPP_API ATimeOfDayHandler : public AActor{    GENERATED_BODY()public:     // Sets default values for this actor's properties    ATimeOfDayHandler();protected:    // Called when the game starts or when spawned    virtual void BeginPlay() override;public:     // Called every frame    virtual void Tick(float DeltaTime) override;    // 钟表走的速度    UPROPERTY()       int32 TimeScale;    UPROPERTY()        int32 Hours;    UPROPERTY()        int32 Minutes;    // 经过的时间    UPROPERTY()        float ElapsedSeconds;    // 声明代理    FOnTimeChangedSignature OnTimeChanged;};

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// Fill out your copyright notice in the Description page of Project Settings.#include "BlankUECPP.h"#include "TimeOfDayHandler.h"// Sets default valuesATimeOfDayHandler::ATimeOfDayHandler(){    // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.    PrimaryActorTick.bCanEverTick = true;    // 让分钟当秒走    TimeScale = 60;    Hours = 0;    Minutes = 0;    ElapsedSeconds = 0.0f;    RootComponent = CreateDefaultSubobject<UBillboardComponent>(TEXT("BillBoard"));}// Called when the game starts or when spawnedvoid ATimeOfDayHandler::BeginPlay(){    Super::BeginPlay();}// Called every framevoid ATimeOfDayHandler::Tick(float DeltaTime){    Super::Tick(DeltaTime);    //GEngine->AddOnScreenDebugMessage(-1, 0.5f, FColor::Red, FString::Printf(TEXT("%f"),DeltaTime);    ElapsedSeconds += (DeltaTime*TimeScale);    if (ElapsedSeconds >= 60)    {        ElapsedSeconds -= 60;        Minutes++;    }    if (Minutes >= 60)    {        Minutes -= 60;        Hours++;    }    GEngine->AddOnScreenDebugMessage(-1, 0.5f, FColor::Red, FString::Printf(TEXT("M:%d H:%d"), Minutes,Hours));    // 执行代理，传出两个参数，传给绑定当前代理的函数    // 是这一条语句让DemoClock里边的时钟一直不断的执行    OnTimeChanged.Broadcast(Hours, Minutes);}

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DemoClock

   加载素材资源，绑定代理

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// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "GameFramework/Actor.h"#include "DemoClock.generated.h"UCLASS()class BLANKUECPP_API ADemoClock : public AActor{    GENERATED_BODY()public:     // Sets default values for this actor's properties    ADemoClock();protected:    // Called when the game starts or when spawned    virtual void BeginPlay() override;public:     // Called every frame    virtual void Tick(float DeltaTime) override;    // 目标绑定函数    void TimeChanged(int32 Hours,int32 Minutes);public:    UPROPERTY()        UStaticMeshComponent* ClockFace;    UPROPERTY()        UStaticMeshComponent* HourHand;    UPROPERTY()        UStaticMeshComponent* MinuteHand;    UPROPERTY()        USceneComponent* HourHandle;    UPROPERTY()        USceneComponent* MinuteHandle;    FDelegateHandle DelegateHandle;};

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// Fill out your copyright notice in the Description page of Project Settings.#include "BlankUECPP.h"#include "DemoClock.h"#include "TimeOfDayHandler.h"// Sets default valuesADemoClock::ADemoClock(){    // Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.    PrimaryActorTick.bCanEverTick = true;    // SceneComponent 这个叫场景组件    RootComponent = CreateDefaultSubobject<USceneComponent>(TEXT("SceneRoot"));    HourHandle=CreateDefaultSubobject<USceneComponent>(TEXT("HourHandle"));    MinuteHandle= CreateDefaultSubobject<USceneComponent>(TEXT("MinuteHandle"));    ClockFace = CreateDefaultSubobject<UStaticMeshComponent>(TEXT("ClockFace"));    HourHand= CreateDefaultSubobject<UStaticMeshComponent>(TEXT("HourHand"));    MinuteHand= CreateDefaultSubobject<UStaticMeshComponent>(TEXT("MinuteHand"));    ConstructorHelpers::FObjectFinder<UStaticMesh> meshAsset(TEXT("StaticMesh'/Engine/BasicShapes/Cylinder.Cylinder'"));    if (meshAsset.Object)    {        ClockFace->SetStaticMesh(meshAsset.Object);        HourHand->SetStaticMesh(meshAsset.Object);        MinuteHand->SetStaticMesh(meshAsset.Object);    }    ClockFace->SetupAttachment(RootComponent);    ClockFace->SetRelativeTransform(FTransform(FRotator(0,0,90),FVector(0,0,0),FVector(2,2,0.5)));    HourHand->AttachToComponent(HourHandle,FAttachmentTransformRules::KeepRelativeTransform);    MinuteHand->AttachToComponent(MinuteHandle, FAttachmentTransformRules::KeepRelativeTransform);    HourHandle->SetupAttachment(RootComponent);    MinuteHandle->SetupAttachment(RootComponent);    HourHand->SetRelativeTransform(FTransform(FRotator(0, 0, 0), FVector(0, 55, 25), FVector(0.1, 0.1, 0.5)));    MinuteHand->SetRelativeTransform(FTransform(FRotator(0, 0, 0), FVector(0, 60, 50), FVector(0.1, 0.1, 1)));}// Called when the game starts or when spawnedvoid ADemoClock::BeginPlay(){    Super::BeginPlay();    TArray<AActor*> TimeOfDayHandlers;    // 获得关卡中所有的ATimeOfDayHandle类型的Actor，并把他们放到TimeOfDayHandlers的数      组中。    UGameplayStatics::GetAllActorsOfClass(GetWorld(),ATimeOfDayHandler::StaticClass(),TimeOfDayHandlers);    if (TimeOfDayHandlers.Num() != 0)    {        // auto 可以自动推断timeOfDayHandler的类型        auto timeOfDayHandler = Cast<ATimeOfDayHandler>(TimeOfDayHandlers[0]);        // 这个是绑定当前代理        DelegateHandle = timeOfDayHandler->OnTimeChanged.AddUObject(this, &ADemoClock::TimeChanged);    }}// Called every framevoid ADemoClock::Tick(float DeltaTime){    Super::Tick(DeltaTime);}void ADemoClock::TimeChanged(int32 Hours, int32 Minutes){    HourHandle->SetRelativeRotation(FRotator(-30*Hours,0,0));    MinuteHandle->SetRelativeRotation(FRotator(-6*Minutes,0,0));}