CollectionVolumeConstraintFacade.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "GeometryCollection/ManagedArrayAccessor.h"
#include "GeometryCollection/ManagedArrayCollection.h"
#include "GeometryCollection/GeometryCollection.h"
 
namespace GeometryCollection::Facades
{
    class FVolumeConstraintFacade
    {
    public:
        // Attributes
        static CHAOS_API const FName GroupName;
        static CHAOS_API const FName VolumeIndex;
        static CHAOS_API const FName Stiffness;
 
        CHAOS_API FVolumeConstraintFacade(FManagedArrayCollection& InCollection);
        CHAOS_API FVolumeConstraintFacade(const FManagedArrayCollection& InCollection);
    
        FVolumeConstraintFacade(FVolumeConstraintFacade&&) = default;
 
        CHAOS_API void DefineSchema();
 
        bool IsConst() const { return Collection == nullptr; }
 
        CHAOS_API bool IsValid() const;
 
        //
        //  Accessors of constraints
        //
        CHAOS_API int32 AddVolumeConstraint(const FIntVector4& NewVolumeIndex, float NewStiffness);
        CHAOS_API FIntVector4 GetVolumeIndex(const int32 AttributeIndex) const;
        CHAOS_API float GetStiffness(const int32 AttributeIndex) const;
        int32 NumVolumeConstraints() const { return VolumeIndexAttribute.Num(); }
        
        CHAOS_API int32 RemoveInvalidVolumeConstraint();
        CHAOS_API int32 RemoveVolumeConstraintBetween(TFunctionRef<bool(const int32 VertexIdx)> IsVertexGroup1, TFunctionRef<bool(const int32 VertexIdx)> IsVertexGroup2);
 
    protected:
        const FManagedArrayCollection& ConstCollection;
        FManagedArrayCollection* Collection = nullptr;
 
        TManagedArrayAccessor<FIntVector4> VolumeIndexAttribute;
        TManagedArrayAccessor<float> StiffnessAttribute;
    };
}