middleware/src/Tracking/Gestures/SwipeDetector.cs
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Middleware : Swipe & Push & Jump(Experimental) Detectors ant events added Server modified for gesture detection TUIO Server C# Modified : Hand cursors redirected to /TUIO/3DCur channel New kind of OSC message created (TuioString) for gesture detection, using /TUIO/_siP channel. TUIO Processing Java Modified : Hand cursors redirected to /TUIO/3DCur channel New kind of OSC message created (TuioString) for gesture detection, using /TUIO/_siP channel. Front Processing : Mask added and modifications in the drawing process New front for gesture detection (just showing a text message in the mask for the moment)
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/*
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 * Projet : TraKERS
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 * Module : MIDDLEWARE
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 * Sous-Module : Tracking/Gestures
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 * Classe : SwipeDetector
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 * 
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 * Auteur : alexandre.bastien@iri.centrepompidou.fr
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 * 
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 * Fonctionnalités : Permet de détecter si l'utilisateur a effectué un Swipe, en se basant sur
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 * des règles appliquées à la positions des noeuds dans le temps.
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 */
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using Microsoft.Kinect;
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namespace Trakers.Tracking.Gestures
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{
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    public class SwipeDetector : GestureDetector
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    {
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        public enum Direction {LEFT, RIGHT, TOP, DOWN};
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        Debug.DebugWindow debug;
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        public SwipeDetector(Debug.DebugWindow _d) : base()
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        {
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            debug = _d;
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            gesturePeriod = (float)0.5;
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            indexesPerSecond = 30;
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            indexesToCheck = (int)(gesturePeriod * indexesPerSecond);
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        }
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        /*
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         * Lit les noeuds de l'historique du squelette afin de détecter un Swipe left.
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         * Règles :
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         * Se fait avec la main droite.
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         * Chaque nouvelle position de la main doit être à la gauche de la précédente.
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         * Chaque nouvelle position de la main ne doit pas s'éloigner verticalement de plus d'une certaine distance.
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         * Le geste doit mesurer horizontalement une certaine distance.
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         */
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        public bool CheckForSwipeLeft()
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        {
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            //Crée un historique de squelette local, puisque l'historique est mis à jour toutes les ~1/30 s.
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            List<List<Joint>> localHistory = new List<List<Joint>>(history);
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            //Si il n'y a pas assez de positions dans l'historique local pour vérifier le geste.
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            if (localHistory.Count < indexesToCheck+1)
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                return false;
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            //La distance de référence est ici la distance entre le milieu du dos et le milieu des épaules.
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            refDistance = Math.Abs(localHistory[0][spineID].Position.Y - localHistory[0][shoulderCenterID].Position.Y);
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            //On commence la position pour les indexesToCheck dernières postures (celle à l'index 0 étant la dernière).
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            startPoint = localHistory[localHistory.Count - indexesToCheck][handRightID].Position;
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            //De la position p1 à pn, on suit l'algorithme.
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            for (int i = localHistory.Count - indexesToCheck + 1; i < localHistory.Count; i++)
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            {
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                //Debug temporaire pour vérifier la validité de certaines contraintes durant la gesture.
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               /*if (localHistory[i][handRightID].Position.Y > localHistory[i][headID].Position.Y)
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                    debug.R1.Fill = System.Windows.Media.Brushes.Blue;
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                else
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                    debug.R1.Fill = System.Windows.Media.Brushes.DarkGray;
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                if(localHistory[i][handRightID].Position.Y < localHistory[i][hipCenterID].Position.Y)
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                    debug.R2.Fill = System.Windows.Media.Brushes.Blue;
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                else
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                    debug.R2.Fill = System.Windows.Media.Brushes.DarkGray;
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                if(localHistory[i][handRightID].Position.X < localHistory[i - 1][handRightID].Position.X)
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                    debug.R3.Fill = System.Windows.Media.Brushes.Blue;
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                else
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                    debug.R3.Fill = System.Windows.Media.Brushes.DarkGray;
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                if(Math.Abs(localHistory[i][handRightID].Position.Y - startPoint.Y) < refDistance/2)
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                    debug.R4.Fill = System.Windows.Media.Brushes.Blue;
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                else
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                    debug.R4.Fill = System.Windows.Media.Brushes.DarkGray;*/
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                //Si la position Y de la main est plus haute que la tête
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                //OU si la position Y de la main est plus basse que la hanche
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                //OU si la nouvelle position X de la main est à droite de la précédente
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                //OU si la nouvelle position Y de la main est plus éloignée de la distance N par rapport à la première position Y
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                //Alors on retourne faux.
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                if (localHistory[i][handRightID].Position.Y < localHistory[i][headID].Position.Y ||
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                localHistory[i][handRightID].Position.Y > localHistory[i][hipCenterID].Position.Y ||
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                localHistory[i][handRightID].Position.X > localHistory[i - 1][handRightID].Position.X ||
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                Math.Abs(localHistory[i][handRightID].Position.Y - startPoint.Y) > refDistance/2)
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                    return false;
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            }
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            //Si la distance horizontale du geste a été plus courte que la distance N
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            //Alors on retourne faux.
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            //float dist = (localHistory[localHistory.Count - 1][handRightID].Position.X - localHistory[localHistory.Count - indexesToCheck][handRightID].Position.X);
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            if (Math.Abs(localHistory[0][handRightID].Position.X - localHistory[localHistory.Count - indexesToCheck][handRightID].Position.X) < refDistance/2)
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                return false;
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            //Si la dernière position de la main droite est sur le côté droit du corps
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            //OU si la première position calculée de la main droite est sur le côté gauche du corps
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            //Alors on retourne faux.
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            if(localHistory[localHistory.Count - 1][handRightID].Position.X > localHistory[localHistory.Count - 1][hipCenterID].Position.X ||
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               localHistory[localHistory.Count - indexesToCheck][handRightID].Position.X < localHistory[localHistory.Count - 1][hipCenterID].Position.X)
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                return false;
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            //System.Console.Out.WriteLine(Math.Abs(localHistory[0][handRightID].Position.X - localHistory[localHistory.Count - indexesToCheck][handRightID].Position.X) + " < " + refDistance/2);
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            //On supprime l'historique local.
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            localHistory.Clear();
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            //Si on est arrivé jusqu'ici, toutes les conditions pour un swipe left ont été remplies.
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            return true;
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        }
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        /*
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         * Lit les noeuds de l'historique du squelette afin de détecter un Swipe right.
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         * Règles :
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         * Se fait avec la main gauche.
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         * Chaque nouvelle position de la main doit être à la droite de la précédente.
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         * Chaque nouvelle position de la main ne doit pas s'éloigner verticalement de plus d'une certaine distance.
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         * Le geste doit mesurer horizontalement une certaine distance.
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         */
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        public bool CheckForSwipeRight()
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        {
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            //Crée un historique de squelette local, puisque l'historique est mis à jour toutes les ~1/30 s.
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            List<List<Joint>> localHistory = new List<List<Joint>>(history);
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            //Si il n'y a pas assez de positions dans l'historique local pour vérifier le geste.
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            if (localHistory.Count < indexesToCheck + 1)
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                return false;
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            //La distance de référence est ici la distance entre le milieu du dos et le milieu des épaules.
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            refDistance = Math.Abs(localHistory[0][spineID].Position.Y - localHistory[0][shoulderCenterID].Position.Y);
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            //On commence la position pour les indexesToCheck dernières postures (celle à l'index 0 étant la dernière).
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            startPoint = localHistory[localHistory.Count - indexesToCheck][handLeftID].Position;
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            //De la position p1 à pn, on suit l'algorithme.
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            for (int i = localHistory.Count - indexesToCheck + 1; i < localHistory.Count; i++)
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            {
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                //Debug temporaire pour vérifier la validité de certaines contraintes durant la gesture.
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                /*if (localHistory[i][handLeftID].Position.Y > localHistory[i][headID].Position.Y)
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                    debug.R1.Fill = System.Windows.Media.Brushes.Cyan;
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                else
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                    debug.R1.Fill = System.Windows.Media.Brushes.DarkGray;
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                if (localHistory[i][handLeftID].Position.Y < localHistory[i][hipCenterID].Position.Y)
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                    debug.R2.Fill = System.Windows.Media.Brushes.Cyan;
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                else
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                    debug.R2.Fill = System.Windows.Media.Brushes.DarkGray;
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                if (localHistory[i][handLeftID].Position.X > localHistory[i - 1][handLeftID].Position.X)
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                    debug.R3.Fill = System.Windows.Media.Brushes.Cyan;
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                else
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                    debug.R3.Fill = System.Windows.Media.Brushes.DarkGray;
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                if (Math.Abs(localHistory[i][handLeftID].Position.Y - startPoint.Y) < refDistance / 2)
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                    debug.R4.Fill = System.Windows.Media.Brushes.Cyan;
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                else
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                    debug.R4.Fill = System.Windows.Media.Brushes.DarkGray;*/
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                //Si la position Y de la main est plus haute que la tête
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                //OU si la position Y de la main est plus basse que la hanche
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                //OU si la nouvelle position X de la main est à gauche de la précédente
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                //OU si la nouvelle position Y de la main est plus éloignée de la distance N par rapport à la première position Y
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                //Alors on retourne faux.
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                if (localHistory[i][handLeftID].Position.Y < localHistory[i][headID].Position.Y ||
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                localHistory[i][handLeftID].Position.Y > localHistory[i][hipCenterID].Position.Y ||
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                localHistory[i][handLeftID].Position.X < localHistory[i - 1][handLeftID].Position.X ||
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                Math.Abs(localHistory[i][handLeftID].Position.Y - startPoint.Y) > refDistance / 2)
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                    return false;
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            }
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            //Si la distance horizontale du geste a été plus courte que la distance N
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            //Alors on retourne faux.
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            //float dist = (localHistory[localHistory.Count - 1][handLeftID].Position.X - localHistory[localHistory.Count - indexesToCheck][handLeftID].Position.X);
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            if (Math.Abs(localHistory[0][handLeftID].Position.X - localHistory[localHistory.Count - indexesToCheck][handLeftID].Position.X) < refDistance / 2)
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                return false;
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            //Si la dernière position de la main droite est sur le côté gauche du corps
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            //OU si la première position calculée de la main droite est sur le côté droit du corps
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            //Alors on retourne faux.
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            if (localHistory[localHistory.Count - 1][handLeftID].Position.X < localHistory[localHistory.Count - 1][hipCenterID].Position.X ||
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               localHistory[localHistory.Count - indexesToCheck][handLeftID].Position.X > localHistory[localHistory.Count - 1][hipCenterID].Position.X)
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                return false;
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            //System.Console.Out.WriteLine(Math.Abs(localHistory[0][handLeftID].Position.X - localHistory[localHistory.Count - indexesToCheck][handLeftID].Position.X) + " < " + refDistance / 2);
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            //On supprime l'historique local.
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            localHistory.Clear();
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            //Si on est arrivé jusqu'ici, toutes les conditions pour un swipe right ont été remplies.
0
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            return true;
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        }
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    }
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}