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Plugins/GIS/Source/GenericInventorySystem/Private/Drops/GIS_DropperComponent.cpp

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+// Copyright 2025 https://yuewu.dev/en  All Rights Reserved.
+
+
+#include "Drops/GIS_DropperComponent.h"
+#include "Engine/World.h"
+#include "GIS_LogChannels.h"
+#include "Components/CapsuleComponent.h"
+#include "GameFramework/Character.h"
+#include "Kismet/KismetMathLibrary.h"
+
+#include UE_INLINE_GENERATED_CPP_BY_NAME(GIS_DropperComponent)
+
+
+UGIS_DropperComponent::UGIS_DropperComponent()
+{
+	PrimaryComponentTick.bStartWithTickEnabled = false;
+	PrimaryComponentTick.bCanEverTick = false;
+	SetIsReplicatedByDefault(true);
+}
+
+void UGIS_DropperComponent::Drop()
+{
+}
+
+
+AActor* UGIS_DropperComponent::CreatePickupActorInstance_Implementation()
+{
+	UWorld* World = GetWorld();
+	check(World);
+	if (PickupActorClass.IsNull())
+	{
+		GIS_CLOG(Error, "missing PickupActorClass!");
+		return nullptr;
+	}
+	UClass* PickupClass = PickupActorClass.LoadSynchronous();
+	if (PickupClass == nullptr)
+	{
+		GIS_CLOG(Error, "failed to load PickupActorClass!");
+		return nullptr;
+	}
+
+	FVector Origin = CalcDropOrigin();
+	AActor* Pickup = World->SpawnActor<AActor>(PickupClass, FTransform(Origin + CalcDropOffset()));
+	if (Pickup == nullptr)
+	{
+		GIS_CLOG(Error, "failed to spawn pickup actor from PickupActorClass(%s)!", *PickupClass->GetName());
+		return nullptr;
+	}
+	return Pickup;
+}
+
+FVector UGIS_DropperComponent::CalcDropOrigin_Implementation() const
+{
+	if (IsValid(DropTransform))
+	{
+		return DropTransform->GetActorLocation();
+	}
+
+	FVector OriginLocation = GetOwner()->GetActorLocation();
+
+	if (const ACharacter* Character = Cast<ACharacter>(GetOwner()))
+	{
+		OriginLocation.Z -= Character->GetCapsuleComponent()->GetScaledCapsuleHalfHeight();
+	}
+	else if (const UCapsuleComponent* CapsuleComponent = Cast<UCapsuleComponent>(GetOwner()->GetRootComponent()))
+	{
+		OriginLocation.Z -= CapsuleComponent->GetScaledCapsuleHalfHeight();
+	}
+	return OriginLocation;
+}
+
+FVector UGIS_DropperComponent::CalcDropOffset_Implementation() const
+{
+	const float RandomX = UKismetMathLibrary::RandomFloatInRange(-DropRadius, DropRadius);
+	const float RandomY = UKismetMathLibrary::RandomFloatInRange(-DropRadius, DropRadius);
+
+	return FVector(RandomX, RandomY, 0);
+}