文章目錄

• 添加機關
• 代碼編寫
• 給密室添加屋頂
• 打印日志
• 控制系統角色
• 創建一個新游戲模式替換DefaultPawn
• 添加抓取組件
• 獲取起點和終點
• 物體拾取，碰撞屬性設置
• 今日完整代碼

添加機關

首先向場景里面添加一個聚光源

添加聚光源以后，可以對其屬性進行修改，如圖：

然后需要給聚光源添加一個觸發體積（TriggerVolume）。

然后調整觸發體積的大小，按空格進行切換模式，移動旋轉縮放

代碼編寫

所有引入的頭文件都需要放在 #include “openDoor.generated.h” 之前。
定義ATriggerVolume的指針，添加UPROPERTY(EditAnywhere)，這樣表示可以在任意地方賦值。
所以可以在界面上進行賦值。

#include <Engine/TriggerVolume.h>UPROPERTY(EditAnywhere) ATriggerVolume* trigger;

賦值如圖：
選中門，然后選中自定義的組件openDoor

編譯完成，會添加Trigger

然后選中TriggerVolume即可。

劃重點：
pawn = GetWorld()->GetFirstPlayerController()->GetPawn(); // 得到defaultPawn

這句代碼不能放到構造函數里面，否則編譯會造成虛幻的崩潰。

給密室添加屋頂

這里使用玻璃作為屋頂。

添加玻璃，然后使用縮放工具進行調整，蓋滿整個房間即可。

打印日志

UE4里面日志，使用UE_LOG，第一個參數默認是LogTemp，第二個參數是日志類型，警告是Warning，字符串使用TEXT() 括起來。
UE_LOG(LogTemp, Warning, TEXT("%s begin openDoor()"), *owner->GetName());

控制系統角色

運行，然后F8彈出，能看到一個DefaultPawn，這個是系統默認角色。

創建一個新游戲模式替換DefaultPawn

創建以后，指定pawn為剛才創建的對象。
運行，F8，pawn就是我們自定義的pawn了。

添加抓取組件

獲取起點和終點

FVector start;FRotator viewRot;GetWorld()->GetFirstPlayerController()->GetPlayerViewPoint(start, viewRot);FVector end = start + viewRot.Vector() * 100; // 100cmDrawDebugLine(GetWorld(), start, end, FColor(255, 0, 0), false, 0.0f, 0, 10.0f);

物體拾取，碰撞屬性設置

在檢查碰撞的時候，只檢測ECollisionChannel::ECC_PhysicsBody類別的物體。

設置物體屬性：

今日完整代碼

openDoor.h

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h" #include "Components/ActorComponent.h" #include "openDoor.generated.h"class AActor; class ATriggerVolume; UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) ) class MYPROJECT_API UopenDoor : public UActorComponent {GENERATED_BODY()public: // Sets default values for this component's propertiesUopenDoor();protected:// Called when the game startsvirtual void BeginPlay() override;public: // Called every framevirtual void TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;void openDoor();void closeDoor();private:AActor* owner;AActor* pawn;UPROPERTY(EditAnywhere)ATriggerVolume* trigger;float openTime = 0.4f;float lastTime = 0.0f; };

openDoor.cpp

// Fill out your copyright notice in the Description page of Project Settings.#include "openDoor.h" #include <GameFramework/Actor.h> #include <Engine/TriggerVolume.h> #include <Engine/World.h>// Sets default values for this component's properties UopenDoor::UopenDoor() {// Set this component to be initialized when the game starts, and to be ticked every frame. You can turn these features// off to improve performance if you don't need them.PrimaryComponentTick.bCanEverTick = true; }// Called when the game starts void UopenDoor::BeginPlay() {Super::BeginPlay();/* openDoor();*/owner = GetOwner();pawn = GetWorld()->GetFirstPlayerController()->GetPawn(); // 得到defaultPawnUE_LOG(LogTemp, Warning, TEXT("%s begin openDoor()"), *owner->GetName()); }// Called every frame void UopenDoor::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) {Super::TickComponent(DeltaTime, TickType, ThisTickFunction);if (nullptr != trigger && trigger->IsOverlappingActor(pawn)){openDoor();lastTime = GetWorld()->GetTimeSeconds();}if (GetWorld()->GetTimeSeconds() - lastTime > openTime){closeDoor();} }void UopenDoor::openDoor() {// pitch=y yaw=z roll=x /* FRotator newRotator = FRotator(0, 0, 0);*/FRotator newRotator = FRotator(0, 180, 0);owner->SetActorRotation(newRotator); }void UopenDoor::closeDoor() {// pitch=y yaw=z roll=xFRotator newRotator = FRotator(0, 90, 0);owner->SetActorRotation(newRotator); }

grabber.h

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h" #include "Components/ActorComponent.h" #include "grabber.generated.h"UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) ) class MYPROJECT_API Ugrabber : public UActorComponent {GENERATED_BODY()public: // Sets default values for this component's propertiesUgrabber();protected:// Called when the game startsvirtual void BeginPlay() override;public: // Called every framevirtual void TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) override;private:FVector getLineStart();FVector getLineEnd();AActor* lineTrace(); };

grabber.cpp

// Fill out your copyright notice in the Description page of Project Settings.#include "grabber.h" #include <Engine/World.h> #include <DrawDebugHelpers.h>// Sets default values for this component's properties Ugrabber::Ugrabber() {// Set this component to be initialized when the game starts, and to be ticked every frame. You can turn these features// off to improve performance if you don't need them.PrimaryComponentTick.bCanEverTick = true;// ... }// Called when the game starts void Ugrabber::BeginPlay() {Super::BeginPlay();// ...}// Called every frame void Ugrabber::TickComponent(float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction) {Super::TickComponent(DeltaTime, TickType, ThisTickFunction); }FVector Ugrabber::getLineStart() {// 設置起點和終點，畫射線FVector start;FRotator viewRot;GetWorld()->GetFirstPlayerController()->GetPlayerViewPoint(start, viewRot);return start; }FVector Ugrabber::getLineEnd() {FVector start;FRotator viewRot;GetWorld()->GetFirstPlayerController()->GetPlayerViewPoint(start, viewRot);return start + viewRot.Vector() * 100; // 100cm }AActor* Ugrabber::lineTrace() {// 檢查碰撞FHitResult hit;GetWorld()->LineTraceSingleByObjectType(hit, getLineStart(), getLineEnd(), FCollisionObjectQueryParams(ECollisionChannel::ECC_PhysicsBody),FCollisionQueryParams(FName(TEXT(""), false, GetOwner()));AActor * act = hit.GetActor();if (nullptr != act){UE_LOG(LogTemp, Warning, TEXT(line hit : % s), *act->GetName());}return act; }

總結

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