integration/Source/Integration/UtilityLibrary.cpp

// Fill out your copyright notice in the Description page of Project Settings.


#include "UtilityLibrary.h"
#include "GameFramework/PlayerController.h"
#include "EnhancedInputSubsystems.h"
#include "Kismet/KismetSystemLibrary.h"
#include "Kismet/GameplayStatics.h"


#define LOCTEXT_NAMESPACE "Luprex Utility"


void UlxUtilityLibrary::CallFunctionByName(UObject *object, const FString &namepart1, const FString &namepart2, const FString &fallback, bool bFailIfNotFound) {
	FString fullname = namepart1 + namepart2;
    if (!IsValid(object)) {
		UE_LOG(LogBlueprint, Error, TEXT("In CallFunctionByName, object passed in is not valid."));
		return;
	}
	UFunction* function = object->FindFunction(FName(*fullname));
	if (function == nullptr) {
		function = object->FindFunction(FName(*fallback));
		if (function == nullptr) {
            if (!bFailIfNotFound) {
                return;
            }
			UE_LOG(LogBlueprint, Error, TEXT("In CallFunctionByName, cannot find the named function or the fallback function"));
			return;
		}
	}
	if (function->ParmsSize != 0) {
		UE_LOG(LogBlueprint, Error, TEXT("CallFunctionByName can only call functions that have no parameters and no return values"));
		return;
	}
	object->ProcessEvent(function, nullptr);
}

FBox UlxUtilityLibrary::GetActorBounds(const AActor *target, bool bOnlyCollidingComponents, bool bIncludeFromChildActors)
{
        FVector ActorOrigin;
        FVector BoxExtent;

        // First argument is bOnlyCollidingComponents - if you want to get the bounds for components that don't have collision enabled then set to false
        // Last argument is bIncludeFromChildActors.  Usually this won't do anything but if we've child-ed an actor - like a gun child-ed to a character
        // then we wouldn't want the gun to be part of the bounds so set to false
        target->GetActorBounds(bOnlyCollidingComponents, ActorOrigin, BoxExtent, bIncludeFromChildActors);

        return FBox::BuildAABB(ActorOrigin, BoxExtent);
}

void UlxUtilityLibrary::AddMovementInputRightward(APawn *target, double ScaleValue, bool Force) {
	FRotator rotator = target->GetControlRotation();
	rotator.Pitch = 0.0;
	rotator.Roll = 0.0;
	rotator.Yaw += 90.0;
	FVector vector = rotator.Vector();
	target->AddMovementInput(vector, ScaleValue, Force);
}

void UlxUtilityLibrary::AddMovementInputForward(APawn *target, double ScaleValue, bool Force) {
	FRotator rotator = target->GetControlRotation();
	rotator.Roll = 0.0;
	rotator.Pitch = 0.0;
	FVector vector = rotator.Vector();
	target->AddMovementInput(vector, ScaleValue, Force);
}

UEnhancedInputLocalPlayerSubsystem *UlxUtilityLibrary::GetEnhancedInputLocalPlayerSubsystem(AController *Controller) {
	APlayerController *pc = Cast<APlayerController>(Controller);
	if (pc != nullptr) {
		UEnhancedInputLocalPlayerSubsystem* subsys = 
			ULocalPlayer::GetSubsystem<UEnhancedInputLocalPlayerSubsystem>(pc->GetLocalPlayer());
		if (subsys != nullptr) {
			return subsys;
		}
	}
	return nullptr;
}

FVector2D UlxUtilityLibrary::PixelToViewportPosition(FVector2D Pixel)
{
	FVector2D ViewportSize;
	GEngine->GameViewport->GetViewportSize(ViewportSize);
	return Pixel / ViewportSize;
}

FVector2D UlxUtilityLibrary::ViewportPositionToPixel(FVector2D Fraction, bool Snap)
{
	FVector2D ViewportSize;
	GEngine->GameViewport->GetViewportSize(ViewportSize);
	FVector2D Pixel = Fraction * ViewportSize;
	if (Snap)
	{
		Pixel.X = FMath::FloorToDouble(Pixel.X) + 0.5;
		Pixel.Y = FMath::FloorToDouble(Pixel.Y) + 0.5;
		Pixel.X = FMath::Min(ViewportSize.X - 0.5, FMath::Max(0.5, Pixel.X));
		Pixel.Y = FMath::Min(ViewportSize.Y - 0.5, FMath::Max(0.5, Pixel.Y));
	}
	else
	{
		Pixel.X = FMath::Min(ViewportSize.X, FMath::Max(0.0, Pixel.X));
		Pixel.Y = FMath::Min(ViewportSize.Y, FMath::Max(0.0, Pixel.Y));
	}
	return Pixel;
}


bool UlxUtilityLibrary::LineTraceThroughPixel(const APlayerController* PlayerController, 
	FVector2D PixelXY, double MaxDistanceFromCamera,
	ETraceTypeQuery TraceChannel, bool bTraceComplex, EDrawDebugTrace::Type DrawDebugType, bool bIgnorePlayerPawn,
	const TArray<AActor*>& ActorsToIgnore, FHitResult& HitResult)
{
	const FLinearColor TraceColor = FLinearColor::Red;
	const FLinearColor TraceHitColor = FLinearColor::Green;
	const double DrawTime = 1.0;

	// Zero out the return values.
	HitResult.Init();

	// Sanity check the distance.
	if (MaxDistanceFromCamera <= 0.0)
	{
		return false;
	}

	// Make sure there's a player pawn.
	AActor *PlayerPawn = PlayerController->GetPawn();
	if (!PlayerPawn) return false;

	// Calculate the trace start and trace end positions in world space.
	FVector WorldStart, WorldDirection, WorldEnd;
	if (!UGameplayStatics::DeprojectScreenToWorld(PlayerController, PixelXY, WorldStart, WorldDirection))
	{
		return false;
	}
	WorldEnd = WorldStart + (WorldDirection * MaxDistanceFromCamera);

	// Find the hit.
	if (UKismetSystemLibrary::LineTraceSingle(PlayerPawn, WorldStart, WorldEnd, TraceChannel, bTraceComplex,
		ActorsToIgnore, DrawDebugType, HitResult, bIgnorePlayerPawn, TraceColor, TraceHitColor, DrawTime))
	{
		return true;
	}

	// Fail.
	HitResult.Init();
	return false;
}