From e001931bb691156f39d5f14dd1d6087bad66b7a8 Mon Sep 17 00:00:00 2001
From: baz <bazzadobs@live.co.uk>
Date: Tue, 24 Oct 2023 22:56:47 +0100
Subject: [PATCH] Create TaskCreateLineOfSight

---
 Source/Nakatomi/TaskCheckLineOfSight.cpp | 62 ++++++++++++++++++++++++
 Source/Nakatomi/TaskCheckLineOfSight.h   | 24 +++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 Source/Nakatomi/TaskCheckLineOfSight.cpp
 create mode 100644 Source/Nakatomi/TaskCheckLineOfSight.h

diff --git a/Source/Nakatomi/TaskCheckLineOfSight.cpp b/Source/Nakatomi/TaskCheckLineOfSight.cpp
new file mode 100644
index 0000000..a0e6942
--- /dev/null
+++ b/Source/Nakatomi/TaskCheckLineOfSight.cpp
@@ -0,0 +1,62 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+
+#include "TaskCheckLineOfSight.h"
+#include <BehaviorTree/BlackboardComponent.h>
+#include "NakatomiCharacter.h"
+#include "PlayerCharacter.h"
+
+EBTNodeResult::Type UTaskCheckLineOfSight::ExecuteTask(UBehaviorTreeComponent& owner, uint8* memory)
+{
+	auto BlackboardComponent = owner.GetBlackboardComponent();
+
+	if (!BlackboardComponent)
+	{
+		return EBTNodeResult::Failed;
+	}
+
+	auto selfActor = Cast<ANakatomiCharacter>(
+		BlackboardComponent->GetValueAsObject(SelfActorKey.SelectedKeyName));
+
+	if (!selfActor)
+	{
+		return EBTNodeResult::Failed;
+	}
+
+	AWeapon* CurrentWeapon = selfActor->GetCurrentWeapon();
+
+	if (!CurrentWeapon)
+	{
+		return EBTNodeResult::Failed;
+	}
+
+	// Calculate starting position and direction
+	FVector TraceStart = selfActor->GetTransform().GetLocation();
+	FRotator PlayerRot = selfActor->GetTransform().GetRotation().Rotator();
+	TraceStart = selfActor->GetRootComponent()->GetComponentLocation();
+	FVector AimDir = PlayerRot.Vector();
+	AimDir.Z = 0.0;
+
+	TraceStart = TraceStart + AimDir * ((selfActor->GetInstigator()->GetActorLocation() - TraceStart) | AimDir);
+
+	// Calculate the hit results from the trace
+	TArray<FHitResult> HitResults;
+
+	// Set up the collision query params, use the Weapon trace settings, Ignore the actor firing this trace
+	FCollisionQueryParams TraceParams(SCENE_QUERY_STAT(WeaponTrace), true, selfActor->GetInstigator());
+	TraceParams.bReturnPhysicalMaterial = true;
+
+	FVector MaxHitLoc = TraceStart + (AimDir * CurrentWeapon->GetWeaponProperties()->ProjectileRange);
+
+	GetWorld()->LineTraceMultiByChannel(HitResults, TraceStart, MaxHitLoc, ECC_GameTraceChannel1, TraceParams);
+
+	for (FHitResult Result : HitResults)
+	{
+		if (Cast<APlayerCharacter>(Result.GetActor()))
+		{
+			return EBTNodeResult::Succeeded;
+		}
+	}
+
+	return EBTNodeResult::Failed;
+}
diff --git a/Source/Nakatomi/TaskCheckLineOfSight.h b/Source/Nakatomi/TaskCheckLineOfSight.h
new file mode 100644
index 0000000..e9680e2
--- /dev/null
+++ b/Source/Nakatomi/TaskCheckLineOfSight.h
@@ -0,0 +1,24 @@
+// Fill out your copyright notice in the Description page of Project Settings.
+
+#pragma once
+
+#include "CoreMinimal.h"
+#include "BehaviorTree/BTTaskNode.h"
+#include "TaskCheckLineOfSight.generated.h"
+
+/**
+ * 
+ */
+UCLASS()
+class NAKATOMI_API UTaskCheckLineOfSight : public UBTTaskNode
+{
+	GENERATED_BODY()
+
+public:
+	UPROPERTY(EditAnywhere, Category = "Options",
+		Meta = (AllowPrivateAccess = "true", DisplayName = "Self Actor Key"))
+	FBlackboardKeySelector SelfActorKey;
+
+public:
+	virtual EBTNodeResult::Type ExecuteTask(UBehaviorTreeComponent& owner, uint8* memory) override;
+};