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// Copyright 2025 https://yuewu.dev/en All Rights Reserved.
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#include "Drops/GIS_CurrencyDropper.h"
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#include "GIS_CurrencySystemComponent.h"
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#include "GIS_LogChannels.h"
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#include "Misc/DataValidation.h"
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#include UE_INLINE_GENERATED_CPP_BY_NAME(GIS_CurrencyDropper)
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void UGIS_CurrencyDropper::BeginPlay()
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{
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MyCurrency = UGIS_CurrencySystemComponent::GetCurrencySystemComponent(GetOwner());
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if (MyCurrency == nullptr)
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{
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GIS_CLOG(Warning, "Mising currency system component!");
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}
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Super::BeginPlay();
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}
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void UGIS_CurrencyDropper::Drop()
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{
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if (AActor* PickupActor = CreatePickupActorInstance())
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{
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if (UGIS_CurrencySystemComponent* CurrencySys = UGIS_CurrencySystemComponent::GetCurrencySystemComponent(PickupActor))
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{
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CurrencySys->SetCurrencies(MyCurrency->GetAllCurrencies());
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}
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}
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}
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#if WITH_EDITOR
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EDataValidationResult UGIS_CurrencyDropper::IsDataValid(FDataValidationContext& Context) const
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{
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if (PickupActorClass.IsNull())
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{
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Context.AddError(FText::FromString(FString::Format(TEXT("%s has no pickup actor class.!"), {*GetName()})));
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return EDataValidationResult::Invalid;
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}
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return Super::IsDataValid(Context);
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}
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#endif
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// Copyright 2025 https://yuewu.dev/en All Rights Reserved.
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#include "Drops/GIS_DropperComponent.h"
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#include "Engine/World.h"
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#include "GIS_LogChannels.h"
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#include "Components/CapsuleComponent.h"
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#include "GameFramework/Character.h"
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#include "Kismet/KismetMathLibrary.h"
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#include UE_INLINE_GENERATED_CPP_BY_NAME(GIS_DropperComponent)
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UGIS_DropperComponent::UGIS_DropperComponent()
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{
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PrimaryComponentTick.bStartWithTickEnabled = false;
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PrimaryComponentTick.bCanEverTick = false;
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SetIsReplicatedByDefault(true);
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}
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void UGIS_DropperComponent::Drop()
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{
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}
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AActor* UGIS_DropperComponent::CreatePickupActorInstance_Implementation()
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{
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UWorld* World = GetWorld();
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check(World);
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if (PickupActorClass.IsNull())
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{
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GIS_CLOG(Error, "missing PickupActorClass!");
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return nullptr;
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}
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UClass* PickupClass = PickupActorClass.LoadSynchronous();
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if (PickupClass == nullptr)
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{
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GIS_CLOG(Error, "failed to load PickupActorClass!");
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return nullptr;
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}
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FVector Origin = CalcDropOrigin();
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AActor* Pickup = World->SpawnActor<AActor>(PickupClass, FTransform(Origin + CalcDropOffset()));
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if (Pickup == nullptr)
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{
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GIS_CLOG(Error, "failed to spawn pickup actor from PickupActorClass(%s)!", *PickupClass->GetName());
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return nullptr;
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}
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return Pickup;
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}
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FVector UGIS_DropperComponent::CalcDropOrigin_Implementation() const
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{
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if (IsValid(DropTransform))
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{
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return DropTransform->GetActorLocation();
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}
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FVector OriginLocation = GetOwner()->GetActorLocation();
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if (const ACharacter* Character = Cast<ACharacter>(GetOwner()))
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{
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OriginLocation.Z -= Character->GetCapsuleComponent()->GetScaledCapsuleHalfHeight();
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}
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else if (const UCapsuleComponent* CapsuleComponent = Cast<UCapsuleComponent>(GetOwner()->GetRootComponent()))
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{
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OriginLocation.Z -= CapsuleComponent->GetScaledCapsuleHalfHeight();
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}
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return OriginLocation;
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}
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FVector UGIS_DropperComponent::CalcDropOffset_Implementation() const
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{
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const float RandomX = UKismetMathLibrary::RandomFloatInRange(-DropRadius, DropRadius);
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const float RandomY = UKismetMathLibrary::RandomFloatInRange(-DropRadius, DropRadius);
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return FVector(RandomX, RandomY, 0);
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}
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@@ -0,0 +1,108 @@
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// Copyright 2025 https://yuewu.dev/en All Rights Reserved.
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#include "Drops/GIS_ItemDropperComponent.h"
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#include "GIS_InventoryTags.h"
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#include "GameFramework/Actor.h"
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#include "GIS_InventorySystemComponent.h"
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#include "GIS_ItemCollection.h"
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#include "GIS_LogChannels.h"
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#include "Pickups/GIS_InventoryPickupComponent.h"
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#include "Pickups/GIS_ItemPickupComponent.h"
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#include "Pickups/GIS_WorldItemComponent.h"
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#include UE_INLINE_GENERATED_CPP_BY_NAME(GIS_ItemDropperComponent)
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void UGIS_ItemDropperComponent::Drop()
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{
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TArray<FGIS_ItemInfo> ItemsToDrop = GetItemsToDrop();
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DropItemsInternal(ItemsToDrop);
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}
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void UGIS_ItemDropperComponent::BeginPlay()
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{
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if (!CollectionTag.IsValid())
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{
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CollectionTag = GIS_CollectionTags::Main;
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}
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Super::BeginPlay();
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}
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TArray<FGIS_ItemInfo> UGIS_ItemDropperComponent::GetItemsToDrop() const
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{
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return GetItemsToDropInternal();
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}
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TArray<FGIS_ItemInfo> UGIS_ItemDropperComponent::GetItemsToDropInternal() const
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{
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TArray<FGIS_ItemInfo> Items;
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UGIS_InventorySystemComponent* Inventory = UGIS_InventorySystemComponent::FindInventorySystemComponent(GetOwner());
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if (Inventory == nullptr)
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{
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GIS_CLOG(Error, "requires inventory system component to drop items.")
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return Items;
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}
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UGIS_ItemCollection* Collection = Inventory->GetCollectionByTag(CollectionTag);
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if (Collection == nullptr)
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{
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GIS_CLOG(Error, " inventory missing collection with tag:%s'", *CollectionTag.ToString())
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return Items;
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}
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Items = Collection->GetAllItemInfos();
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return Items;
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}
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void UGIS_ItemDropperComponent::DropItemsInternal(const TArray<FGIS_ItemInfo>& ItemInfos)
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{
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if (bDropAsInventory)
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{
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DropInventoryPickup(ItemInfos);
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}
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else
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{
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for (int32 i = 0; i < ItemInfos.Num(); i++)
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{
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DropItemPickup(ItemInfos[i]);
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}
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}
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}
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void UGIS_ItemDropperComponent::DropInventoryPickup(const TArray<FGIS_ItemInfo>& ItemInfos)
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{
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if (AActor* PickupActor = CreatePickupActorInstance())
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{
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UGIS_InventorySystemComponent* Inventory = PickupActor->FindComponentByClass<UGIS_InventorySystemComponent>();
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UGIS_InventoryPickupComponent* Pickup = PickupActor->FindComponentByClass<UGIS_InventoryPickupComponent>();
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if (Inventory == nullptr || Pickup == nullptr)
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{
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GIS_CLOG(Error, "Spawned pickup(%s) missing either inventory component or inventory pickup component.", *PickupActor->GetName());
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return;
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}
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UGIS_ItemCollection* Collection = Inventory->GetDefaultCollection();
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if (Collection == nullptr)
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{
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GIS_CLOG(Error, "Spawned pickup(%s)'s inventory doesn't have default collection.", *PickupActor->GetName());
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return;
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}
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Collection->RemoveAll();
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Collection->AddItems(ItemInfos);
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}
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}
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void UGIS_ItemDropperComponent::DropItemPickup(const FGIS_ItemInfo& ItemInfo)
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{
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if (AActor* Pickup = CreatePickupActorInstance())
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{
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UGIS_ItemPickupComponent* ItemPickup = Pickup->FindComponentByClass<UGIS_ItemPickupComponent>();
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UGIS_WorldItemComponent* WorldItem = Pickup->FindComponentByClass<UGIS_WorldItemComponent>();
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if (ItemPickup == nullptr || WorldItem == nullptr)
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{
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GIS_CLOG(Error, "Spawned pickup(%s) missing either ItemPickup component or WorldItem component.", *Pickup->GetName());
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}
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WorldItem->SetItemInfo(ItemInfo.Item, ItemInfo.Amount);
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}
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}
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@@ -0,0 +1,94 @@
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// Copyright 2025 https://yuewu.dev/en All Rights Reserved.
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#include "Drops/GIS_RandomItemDropperComponent.h"
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#include "GameFramework/Actor.h"
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#include "GIS_InventorySystemComponent.h"
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#include "GIS_ItemCollection.h"
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#include "GIS_LogChannels.h"
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#include UE_INLINE_GENERATED_CPP_BY_NAME(GIS_RandomItemDropperComponent)
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TArray<FGIS_ItemInfo> UGIS_RandomItemDropperComponent::GetItemsToDropInternal() const
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{
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TArray<FGIS_ItemInfo> Results;
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UGIS_InventorySystemComponent* Inventory = UGIS_InventorySystemComponent::FindInventorySystemComponent(GetOwner());
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if (Inventory == nullptr)
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{
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GIS_CLOG(Error, "requires inventory system component to drop items.")
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return Results;
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}
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UGIS_ItemCollection* Collection = Inventory->GetCollectionByTag(CollectionTag);
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if (Collection == nullptr)
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{
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GIS_CLOG(Error, " inventory missing collection with tag:%s'", *CollectionTag.ToString())
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return Results;
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}
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const TArray<FGIS_ItemStack>& ItemStacks = Collection->GetAllItemStacks();
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TArray<FGIS_ItemInfo> ItemInfos;
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ItemInfos.Reserve(ItemStacks.Num());
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int32 ProbabilitySum = 0;
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for (int32 i = 0; i < ItemStacks.Num(); ++i)
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{
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//加权
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ProbabilitySum += ItemStacks[i].Amount;
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ItemInfos[i] = FGIS_ItemInfo(ProbabilitySum, ItemStacks[i]);
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}
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int32 RandomAmount = FMath::RandRange(MinAmount, MaxAmount + 1);
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Results.Empty();
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for (int i = 0; i < RandomAmount; i++)
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{
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auto& selectedItemInfo = GetRandomItemInfo(ItemInfos, ProbabilitySum);
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bool foundMatch = false;
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//去重，多个栈可能指向同一个道具实例，若发现重复
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for (int j = 0; j < Results.Num(); j++)
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{
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if (Results[j].Item == selectedItemInfo.Item)
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{
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Results[j] = FGIS_ItemInfo(Results[j].Amount + 1, Results[j]);
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foundMatch = true;
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break;
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}
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}
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if (!foundMatch) { Results.Add(FGIS_ItemInfo(1, selectedItemInfo)); }
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}
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return Results;
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}
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const FGIS_ItemInfo& UGIS_RandomItemDropperComponent::GetRandomItemInfo(const TArray<FGIS_ItemInfo>& ItemInfos, int32 ProbabilitySum) const
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{
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int32 RandomProbabilityIdx = FMath::RandRange(0, ProbabilitySum);
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int32 min = 0;
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int32 max = ItemInfos.Num() - 1;
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int32 mid = 0;
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while (min <= max)
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{
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mid = (min + max) / 2;
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if (ItemInfos[mid].Amount == RandomProbabilityIdx)
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{
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++mid;
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break;
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}
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if (RandomProbabilityIdx < ItemInfos[mid].Amount
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&& (mid == 0 || RandomProbabilityIdx > ItemInfos[mid - 1].Amount)) { break; }
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if (RandomProbabilityIdx < ItemInfos[mid].Amount) { max = mid - 1; }
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else
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{
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min = mid + 1;
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}
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}
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return ItemInfos[mid];
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}
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