FInvertiblePiecewiseLinearFunction.h

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// Copyright Epic Games, Inc. All Rights Reserved.
#pragma once
#include "CoreMinimal.h"
 
struct FInvertiblePointSlopeFunction
{
    FInvertiblePointSlopeFunction(FVector2f Point, float Slope);
 
    float SolveForY(float X) const;
    float SolveForX(float Y) const;
 
    FVector2f Point;
    float Slope;
};
 
class FInvertiblePiecewiseLinearFunction
{
public:
    FInvertiblePiecewiseLinearFunction();
 
    // construct using a list of fixed points that will be interpolated between
    explicit FInvertiblePiecewiseLinearFunction(const TArray<FVector2f>& FixedPoints);
 
    float SolveForY(float X) const;
    float SolveForX(float Y) const;
 
private:
    using SubFunction = FInvertiblePointSlopeFunction;
    const SubFunction& FindSubFunctionAtX(float X) const;
    const SubFunction& FindSubFunctionAtY(float Y) const;
 
    TArray<SubFunction> SubFunctions;
};