LinearSpline.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "BSpline.h"
namespace UE
{
namespace Geometry
{
namespace Spline
{
 
template<typename T> class UE_EXPERIMENTAL(5.7, "") TLinearSpline;
    
template<typename T>
class TLinearSpline : public TBSpline<T, 1>
{
public:
    using Base = TBSpline<T, 1>;
 
    DECLARE_SPLINE_TYPE_ID(TEXT("BSpline1"), *TSplineValueTypeTraits<T>::Name);
 
    TLinearSpline()
    {
    }
 
    virtual float GetParameter(int32 Index) const override
    {
        return (Index >= 0 && Index + 1 < this->Knots.Num())
            ? this->Knots[Index + 1]
            : 0.0f;
    }
 
    virtual bool SetParameter(int32 Index, float NewParam) override
    {
        if (Index < 0 || Index + 1 >= this->Knots.Num())
            return false;
 
        float Prev = (Index > 0) ? this->Knots[Index] : -FLT_MAX;
        float Next = (Index + 2 < this->Knots.Num()) ? this->Knots[Index + 2] : FLT_MAX;
 
        if (NewParam < Prev || NewParam > Next)
            return false;
 
        this->Knots[Index + 1] = NewParam;
        return true;
    }
 
};
 
using FLinearSplineFloat = TLinearSpline<float>; 
using FLinearSplineVector3d = TLinearSpline<FVector3d>;
 
} // end namespace UE::Geometry::Spline
} // end namespace UE::Geometry
} // end namespace UE