UE4 C++ 在屏幕上绘制线和文字的方法

1. 通过C++代码，在屏幕上绘制点、线、圆等图形来进行调试或显示效果。

void DrawDebugLine(const FVector& StartPost, const FVector& EndPos, const FLinearColor& LineColor)
{
	ULineBatchComponent* const LineBatcher = GetWorld()->PersistentLineBatcher;//GetDebugLineBatcher(GetWorld(), bPersistentLines, LifeTime, (DepthPriority == SDPG_Foreground));
	if (LineBatcher != NULL)
	{
		//画点
		LineBatcher->DrawPoint(StartPost, FLinearColor::Blue, 5, 10, 0.f);
		//画线
		LineBatcher->DrawLine(StartPost, EndPos, LineColor, 10, 0.f);
		//还有很多其他的绘制函数 DrawLines  DrawBox  DrawDirectionalArrow   DrawCircle  DrawSolidBox  DrawMesh
	}
}

2. 通过C++代码，在屏幕上显示一行文字。

void DrawDebugText(USceneComponent* DummyRoot, const FString& text, const FVector& pos, const FLinearColor& TextColor, float WorldSize)
{
	UTextRenderComponent* ScoreText = nullptr;

	// Create static mesh component
	//ScoreText = CreateDefaultSubobject(TEXT("ScoreText0"));
	ScoreText = NewObject(this, UTextRenderComponent::StaticClass());
	ScoreText->RegisterComponent();
	ScoreText->AttachTo(DummyRoot);
	
	ScoreText->SetRelativeRotation(FRotator(90.f, 0.f, 0.f));
	ScoreText->SetRelativeLocation(pos);
	ScoreText->SetWorldSize(WorldSize);
	ScoreText->SetTextRenderColor(FColor::Yellow);
	// Update text
	ScoreText->SetText(text);
}

展示下最终效果：