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5 打印调试信息

038 Actor Creation

基于 Actor 创建 C++ 文件 Items/Item.cpp

039 Blueprint Creation

基于 Item C++ 创建蓝图 BP_Item

Item.cpp
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void AItem::BeginPlay()
{
    Super::BeginPlay();

    UE_LOG(LogTemp, Warning, TEXT("BeginPlay called!"));
}

040 Onscreen Debug Messages

Item.cpp
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void AItem::BeginPlay()
{
    if (GEngine)
    {
        GEngine->AddOnScreenDebugMessage(1, 60.f, FColor::Cyan, FString("Item OnScreen Message!"));
    }
}

041 Formatting Strings

Item.cpp
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void AItem::Tick(float DeltaTime)
{
    Super::Tick(DeltaTime);

    UE_LOG(LogTemp, Warning, TEXT("DeltaTime: %f"), DeltaTime);
}
Item.cpp
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void AItem::Tick(float DeltaTime)
{
    if (GEngine)
    {
        FString Message = FString::Printf(TEXT("DeltaTime: %f"), DeltaTime);
        GEngine->AddOnScreenDebugMessage(1, 60.f, FColor::Cyan, Message);
    }
}

FString 重载了 * 运算符，使用 * 会转变为 C 风格字符串

Item.cpp
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void AItem::Tick(float DeltaTime)
{
    if (GEngine)
    {
        FString Name = GetName();
        FString Message = FString::Printf(TEXT("Item Name: %s"), *Name);
        GEngine->AddOnScreenDebugMessage(1, 60.f, FColor::Cyan, Message);

        UE_LOG(LogTemp, Warning, TEXT("Item Name: %s"), *Name);
    }
}

042 Drawing Debug Spheres

Item.cpp
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void AItem::BeginPlay()
{
    UWorld* World = GetWorld();

    if (World)
    {
        FVector Location = GetActorLocation();
        DrawDebugSphere(World, Location, 25.f, 24, FColor::Red, false, 30.f);
    }
}
Slash.h
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#define DRAW_SPHERE(Location) if (GetWorld()) DrawDebugSphere(GetWorld(), Location, 25.f, 12, FColor::Red, true);
Item.cpp
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#include "Slash/Slash.h"

void AItem::BeginPlay()
{
    FVector Location = GetActorLocation();
    DRAW_SPHERE(Location);
}

043 Drawing Debug Lines

Slash.h
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#define DRAW_LINE(StartLocation, EndLocation) if (GetWorld()) DrawDebugLine(GetWorld(), StartLocation, EndLocation, FColor::Red, true, -1.f, 0, 1.f);
Item.cpp
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void AItem::BeginPlay()
{
    Super::BeginPlay();

    UWorld* World = GetWorld();
    FVector Location = GetActorLocation();
    FVector Forward = GetActorForwardVector();

    DRAW_SPHERE(Location);
    DRAW_LINE(Location, Location + Forward * 100.f);
}

044 Drawing Debug Points

Slash.h
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#define DRAW_VECTOR(StartLocation, EndLocation) if (GetWorld()) \
    { \
        DrawDebugLine(GetWorld(), StartLocation, EndLocation, FColor::Red, true, -1.f, 0, 1.f); \
        DrawDebugPoint(GetWorld(), EndLocation, 15.f, FColor::Red, true); \
    }
Item.cpp
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void AItem::BeginPlay()
{
    Super::BeginPlay();

    UWorld* World = GetWorld();
    FVector Location = GetActorLocation();
    FVector Forward = GetActorForwardVector();

    DRAW_SPHERE(Location);
    DRAW_VECTOR(Location, Location + Forward * 100.f);
}

045 Custom Header Files

DebugMacros.h
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#pragma once

#include "DrawDebugHelpers.h"

#define DRAW_SPHERE(Location) if (GetWorld()) DrawDebugSphere(GetWorld(), Location, 25.f, 12, FColor::Red, true);
#define DRAW_LINE(StartLocation, EndLocation) if (GetWorld()) DrawDebugLine(GetWorld(), StartLocation, EndLocation, FColor::Red, true, -1.f, 0, 1.f);
#define DRAW_POINT(Location) if (GetWorld()) DrawDebugPoint(GetWorld(), Location, 15.f, FColor::Red, true);
#define DRAW_VECTOR(StartLocation, EndLocation) if (GetWorld()) \
{ \
DrawDebugLine(GetWorld(), StartLocation, EndLocation, FColor::Red, true, -1.f, 0, 1.f); \
DrawDebugPoint(GetWorld(), EndLocation, 15.f, FColor::Red, true); \
}
Item.cpp
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#include "Slash/DebugMacros.h"

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