最简单的 UE 4 C++ 教程 —— 绘制 UE4 辅助调试的形状【六】
【摘要】
【原教程是基于 UE 4.18，我是基于 UE 4.25】
英文原地址
接上一节，在本教程中，我们将绘制 DrawDebugHelpers.h 提供的多个调试形状。DrawDebugHelpers.h 包含的相关的所有内容都是由 UE4 提供的。
创建一个新的 C++ Actor 子...
【原教程是基于 UE 4.18，我是基于 UE 4.25】
接上一节，在本教程中，我们将绘制 DrawDebugHelpers.h 提供的多个调试形状。DrawDebugHelpers.h 包含的相关的所有内容都是由 UE4 提供的。
创建一个新的 C++ Actor 子类并将其命名为 MyDrawDebugHelpers 。在头文件中，我们将在 .h 中声明将在 .cpp 文件中使用的变量，它们也可以在编辑器中进行编辑。我们将创建一个FVectors，一个 FMatrix，一个 FBox，和一个 FTransform。
该头文件代码如下：
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#pragma once
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#include "CoreMinimal.h"
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#include "GameFramework/Actor.h"
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#include "MyDrawDebugHelpers.generated.h"
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UCLASS()
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class UNREALCPP_API AMyDrawDebugHelpers : public AActor
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{
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GENERATED_BODY()
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public:
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// Sets default values for this actor's properties
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AMyDrawDebugHelpers();
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protected:
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// Called when the game starts or when spawned
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virtual void BeginPlay() override;
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public:
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// Called every frame
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virtual void Tick(float DeltaTime) override;
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// declare location variables
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UPROPERTY(EditAnywhere, Category = "Locations")
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FVector LocationOne;
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UPROPERTY(EditAnywhere, Category = "Locations")
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FVector LocationTwo;
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UPROPERTY(EditAnywhere, Category = "Locations")
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FVector LocationThree;
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UPROPERTY(EditAnywhere, Category = "Locations")
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FVector LocationFour;
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UPROPERTY(EditAnywhere, Category = "Locations")
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FVector LocationFive;
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UPROPERTY(EditAnywhere, Category = "Locations")
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FMatrix CircleMatrix;
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UPROPERTY(EditAnywhere, Category = "Locations")
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FBox MyBox;
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UPROPERTY(EditAnywhere, Category = "Locations")
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FTransform MyTransform;
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};
同时别忘了还要 include 头文件 DrawDebugHelpers.h
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#include "MyDrawDebugHelpers.h"
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// include draw debu helpers header file
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#include "DrawDebugHelpers.h"
在.cpp文件中，我们将首先为变量指定默认值。下面是我们将为默认值添加的初始化代码。
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// Sets default values
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AMyDrawDebugHelpers::AMyDrawDebugHelpers()
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{
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// Set this actor to call Tick() every frame. You can turn this off to improve performance if you don't need it.
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PrimaryActorTick.bCanEverTick = true;
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// init variables with values
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LocationOne = FVector(0,0,600);
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LocationTwo = FVector(0,-600,600);
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LocationThree = FVector(0,600,600);
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LocationFour = FVector(-300,0,600);
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LocationFive = FVector(-400,-600,600);
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MyBox = FBox(FVector(0,0,0), FVector(200,200,200));
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}
接下来，我们将在 BeginPlay() 函数中绘制许多不同的形状。
下面是我们将添加到 BeginPlay() 来绘制所有形状的函数。
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// Called when the game starts or when spawned
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void AMyDrawDebugHelpers::BeginPlay()
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{
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Super::BeginPlay();
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DrawDebugPoint(GetWorld(), LocationOne, 200, FColor(52,220,239), true);
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DrawDebugSphere(GetWorld(), LocationTwo, 200, 26, FColor(181,0,0), true, -1, 0, 2);
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DrawDebugCircle(GetWorld(), CircleMatrix, 200, 50, FColor(0,104,167), true, -1, 0, 10);
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DrawDebugCircle(GetWorld(), LocationFour, 200, 50, FColor(0,0,0), true, -1, 0, 10);
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DrawDebugSolidBox(GetWorld(), MyBox, FColor(20, 100, 240), MyTransform, true);
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DrawDebugBox(GetWorld(), LocationFive, FVector(100,100,100), FColor::Purple, true, -1, 0, 10);
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DrawDebugLine(GetWorld(), LocationTwo, LocationThree, FColor::Emerald, true, -1, 0, 10);
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DrawDebugDirectionalArrow(GetWorld(), FVector(-300, 600, 600), FVector(-300, -600, 600), 120.f, FColor::Magenta, true, -1.f, 0, 5.f);
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DrawDebugCrosshairs(GetWorld(), FVector(0,0,1000), FRotator(0,0,0), 500.f, FColor::White, true, -1.f, 0);
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}
编译代码。将你的新 Actor 实例对象拖放到场景中，则形状将在游戏中绘制。同时还可以在 Actor 的详细信息面板中编辑那些变量。
下面是最终的 .cpp 代码。
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#include "MyDrawDebugHelpers.h"
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// include draw debu helpers header file
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#include "DrawDebugHelpers.h"
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// Sets default values
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AMyDrawDebugHelpers::AMyDrawDebugHelpers()
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{
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// Set this actor to call Tick() every frame. You can turn this off to improve performance if you don't need it.
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PrimaryActorTick.bCanEverTick = true;
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// init variables with values
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LocationOne = FVector(0,0,600);
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LocationTwo = FVector(0,-600,600);
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LocationThree = FVector(0,600,600);
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LocationFour = FVector(-300,0,600);
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LocationFive = FVector(-400,-600,600);
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MyBox = FBox(FVector(0,0,0), FVector(200,200,200));
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}
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// Called when the game starts or when spawned
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void AMyDrawDebugHelpers::BeginPlay()
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{
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Super::BeginPlay();
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DrawDebugPoint(GetWorld(), LocationOne, 200, FColor(52,220,239), true);
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DrawDebugSphere(GetWorld(), LocationTwo, 200, 26, FColor(181,0,0), true, -1, 0, 2);
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DrawDebugCircle(GetWorld(), CircleMatrix, 200, 50, FColor(0,104,167), true, -1, 0, 10);
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DrawDebugCircle(GetWorld(), LocationFour, 200, 50, FColor(0,0,0), true, -1, 0, 10);
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DrawDebugSolidBox(GetWorld(), MyBox, FColor(20, 100, 240), MyTransform, true);
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DrawDebugBox(GetWorld(), LocationFive, FVector(100,100,100), FColor::Purple, true, -1, 0, 10);
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DrawDebugLine(GetWorld(), LocationTwo, LocationThree, FColor::Emerald, true, -1, 0, 10);
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DrawDebugDirectionalArrow(GetWorld(), FVector(-300, 600, 600), FVector(-300, -600, 600), 120.f, FColor::Magenta, true, -1.f, 0, 5.f);
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DrawDebugCrosshairs(GetWorld(), FVector(0,0,1000), FRotator(0,0,0), 500.f, FColor::White, true, -1.f, 0);
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}
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// Called every frame
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void AMyDrawDebugHelpers::Tick(float DeltaTime)
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{
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Super::Tick(DeltaTime);
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}
最终效果如下
文章来源: panda1234lee.blog.csdn.net，作者：panda1234lee，版权归原作者所有，如需转载，请联系作者。
原文链接：panda1234lee.blog.csdn.net/article/details/119100805
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