ChaosTrailingEventFilter.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
 
#include "CoreMinimal.h"
#include "UObject/ObjectMacros.h"
#include "ChaosFilter.h"
#include "EventsData.h"
#include "ChaosTrailingEventFilter.generated.h"
 
// A trailing event data structure. 
USTRUCT(BlueprintType)
struct FChaosTrailingEventData
{
    GENERATED_USTRUCT_BODY()
 
    
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    FVector Location;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    FVector Velocity;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    FVector AngularVelocity;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    float Mass;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    int32 ParticleIndex;
 
    FChaosTrailingEventData()
        : Location(FVector::ZeroVector)
        , Velocity(FVector::ZeroVector)
        , AngularVelocity(FVector::ZeroVector)
        , Mass(0.0f)
        , ParticleIndex(INDEX_NONE)
    {
    }
};
 
// Enumeration defining how to sort trailing results
UENUM(BlueprintType)
enum class EChaosTrailingSortMethod : uint8
{
    SortNone,
    SortByHighestMass,
    SortByHighestSpeed,
    SortByNearestFirst,
 
    Count UMETA(Hidden)
};
 
USTRUCT(BlueprintType)
struct FChaosTrailingEventRequestSettings
{
    GENERATED_USTRUCT_BODY()
 
    
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    int32 MaxNumberOfResults;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    float MinMass;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    float MinSpeed;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    float MinAngularSpeed;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Filters")
    float MaxDistance;
 
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Sort")
    EChaosTrailingSortMethod SortMethod;
 
    FChaosTrailingEventRequestSettings()
        : MaxNumberOfResults(0)
        , MinMass(0.0f)
        , MinSpeed(0.0f)
        , MinAngularSpeed(0.0f)
        , MaxDistance(0.0f)
        , SortMethod(EChaosTrailingSortMethod::SortByHighestMass)
    {
    }
};
 
class FChaosTrailingEventFilter 
    : public IChaosEventFilter<Chaos::FTrailingDataArray, TArray<FChaosTrailingEventData>, EChaosTrailingSortMethod>
{
public:
    FChaosTrailingEventFilter(FChaosTrailingEventRequestSettings* FilterSettingsIn) : TrailingEventRequestSettings(FilterSettingsIn) {}
 
    GEOMETRYCOLLECTIONENGINE_API virtual void FilterEvents(const FTransform& ChaosComponentTransform, const Chaos::FTrailingDataArray& RawTrailingDataArray) override;
 
    GEOMETRYCOLLECTIONENGINE_API virtual void SortEvents(TArray<FChaosTrailingEventData>& InOutTrailingEvents, EChaosTrailingSortMethod SortMethod, const FTransform& InTransform) override;
 
private:
    FChaosTrailingEventFilter() : TrailingEventRequestSettings(nullptr) {}
    const FChaosTrailingEventRequestSettings* TrailingEventRequestSettings;
};