GestureRecognizer.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
     GestureRecognizer - handles detecting when gestures happen
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "InputCoreTypes.h"
 
class FGestureRecognizer
{
public:
    FGestureRecognizer() : bIsReadyForPinch(false), AnchorDistanceSq(0.0f), StartAngle(0.0f),
        bIsReadyForFlick(false), FlickTime(0.0f), PreviousTouchCount(0)
    {};
 
    void DetectGestures(const FVector (&Touches)[EKeys::NUM_TOUCH_KEYS], class UPlayerInput* PlayerInput, float DeltaTime);
 
    void SetAnchorDistanceSquared(const FVector2D FirstPoint, const FVector2D SecontPoint);
 
protected:
    void HandleGesture(class UPlayerInput* PlayerInput, FKey Gesture, bool bStarted, bool bEnded);
    
    TMap<FKey, float> CurrentGestureValues;
 
    FVector2D AnchorPoints[EKeys::NUM_TOUCH_KEYS];
 
    FVector2D LastPinchPoint_Start;
    FVector2D LastPinchPoint_End;
 
    bool bIsReadyForPinch;
    float AnchorDistanceSq;
    float StartAngle;
    bool bIsReadyForFlick;
    FVector2D FlickCurrent;
    float FlickTime;
    int32 PreviousTouchCount;
};