TargetSelector.h

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// Fill out your copyright notice in the Description page of Project Settings.
 
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/Object.h"
#include "TargetSelector.generated.h"
 
class AMainPlayerCharacter;
class AActor;
class APlayerController;
class ITargetableInterface;
 
 
UENUM(BlueprintType)
enum class ETargetSelectionMode : uint8
{
    CurrentTargetOrDensity,
    DensityOnly,
    CurrentTargetOnly
};
 
 
USTRUCT(BlueprintType)
struct FTargetSelectionResult
{
    GENERATED_BODY()
 
public:
    UPROPERTY(BlueprintReadOnly, Category = "Target")
    bool bHasTarget = false;
 
    UPROPERTY(BlueprintReadOnly, Category = "Target")
    TObjectPtr<AActor> TargetActor = nullptr;
 
    UPROPERTY(BlueprintReadOnly, Category = "Target")
    FVector TargetLocation = FVector::ZeroVector;
 
    UPROPERTY(BlueprintReadOnly, Category = "Target")
    float TargetDistance = 0.0f;
};
 
 
UCLASS(Blueprintable, EditInlineNew, DefaultToInstanced)
class CK_UE_API UTargetSelector : public UObject
{
    GENERATED_BODY()
 
public:
    bool ResolveTarget(const AMainPlayerCharacter* Player, FTargetSelectionResult& OutResult) const;
    
private:
    ITargetableInterface* GetCurrentTarget(const AMainPlayerCharacter* Player) const;
    TArray<ITargetableInterface*> GatherTargets(const AMainPlayerCharacter* Player) const;
    TArray<ITargetableInterface*> FilterVisibleTargets(const APlayerController* PC, const TArray<ITargetableInterface*>& Candidates) const;
    ITargetableInterface* PickDensityCenterTarget(const AMainPlayerCharacter* Player, const TArray<ITargetableInterface*>& Candidates) const;
    TArray<ITargetableInterface*> FilterTargetsInPlayerRange(const AMainPlayerCharacter* Player, const TArray<ITargetableInterface*>& Candidates) const;
 
private:
    bool HasLineOfSight(const APlayerController* PC, ITargetableInterface* Targetable) const;
    bool IsTargetInCameraView(const APlayerController* PC, ITargetableInterface* Targetable) const;
 
protected:
    UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Target")
    ETargetSelectionMode SelectionMode = ETargetSelectionMode::CurrentTargetOrDensity; 
 
    UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Target", meta = (ClampMin = "0.0"))
    float TargetSearchRange = 2000.0f; 
 
    UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Target", meta = (ClampMin = "0.0"))
    float FallbackSearchRange = 2000.0f; 
 
    UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Target", meta = (ClampMin = "0.0"))
    float DensityRadius = 350.0f; 
 
    UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Target")
    bool bUseLineOfSight = true; 
};