80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "CoreMinimal.h"
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#include "Math/MathFwd.h"
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#include "Math/Vector.h"
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#define UE_API VIEWPORTINTERACTION_API
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namespace ViewportInteractionUtils
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{
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/************************************************************************/
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/* 1 Euro filter smoothing algorithm */
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/* http://cristal.univ-lille.fr/~casiez/1euro/ */
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/************************************************************************/
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class FOneEuroFilter
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{
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private:
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class FLowpassFilter
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{
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public:
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/** Default constructor */
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FLowpassFilter();
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/** Calculate */
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FVector Filter(const FVector& InValue, const FVector& InAlpha);
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/** If the filter was not executed yet */
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bool IsFirstTime() const;
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/** Get the previous filtered value */
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FVector GetPrevious() const;
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private:
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/** The previous filtered value */
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FVector Previous;
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/** If this is the first time doing a filter */
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bool bFirstTime;
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};
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public:
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/** Default constructor */
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UE_API FOneEuroFilter();
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UE_API FOneEuroFilter(const double InMinCutoff, const double InCutoffSlope, const double InDeltaCutoff);
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/** Smooth vector */
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UE_API FVector Filter(const FVector& InRaw, const double InDeltaTime);
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/** Set the minimum cutoff */
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UE_API void SetMinCutoff(const double InMinCutoff);
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/** Set the cutoff slope */
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UE_API void SetCutoffSlope(const double InCutoffSlope);
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/** Set the delta slope */
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UE_API void SetDeltaCutoff(const double InDeltaCutoff);
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private:
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UE_API const FVector CalculateCutoff(const FVector& InValue);
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UE_API const FVector CalculateAlpha(const FVector& InCutoff, const double InDeltaTime) const;
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UE_API const double CalculateAlpha(const double InCutoff, const double InDeltaTime) const;
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double MinCutoff;
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double CutoffSlope;
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double DeltaCutoff;
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FLowpassFilter RawFilter;
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FLowpassFilter DeltaFilter;
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};
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}
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#undef UE_API
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