detect Swipe in four directions (android)

Question

Hello I need to java script code that can detect four directions (up, down , right , left) swipe on screen and debug once when that is happen. I write some codes with delta position but never couldn't have result. thanks

Answer 1

Best Answer

Answer by MrVerdoux · Dec 20, 2013 at 10:30 AM

Why don´t you check

 float deltaX = deltaPosition.x;
 float deltaY = deltaPosition.y;
 float biggerDelta = (deltaX > deltaY) ? deltaX : deltaY;
 int direction = Mathf.Sign (biggerDelta);

With that info you should be able to get it. At least that´s how I do it.

Edit: new script, same idea, it might need some tweak but I don´t see why it shoudn´t work.

 using System.Collections;
 
 public class MiniGestureRecognizer : MonoBehaviour {
 
     public enum SwipeDirection{
         Up,
         Down,
         Right,
         Left
     }
 
     public static event Action<SwipeDirection> Swipe;
     private bool swiping = false;
     private bool eventSent = false;
     private Vector2 lastPosition;
     
     void Update () {
         if (Input.touchCount == 0) 
             return;
 
         if (Input.GetTouch(0).deltaPosition.sqrMagnitude != 0){
             if (swiping == false){
                 swiping = true;
                 lastPosition = Input.GetTouch(0).position;
                 return;
             }
             else{
                 if (!eventSent) {
                     if (Swipe != null) {
                         Vector2 direction = Input.GetTouch(0).position - lastPosition;
 
                         if (Mathf.Abs(direction.x) > Mathf.Abs(direction.y)){
                             if (direction.x > 0) 
                                 Swipe(SwipeDirection.Right);
                             else
                                 Swipe(SwipeDirection.Left);
                         }
                         else{
                             if (direction.y > 0)
                                 Swipe(SwipeDirection.Up);
                             else
                                 Swipe(SwipeDirection.Down);
                         }
 
                         eventSent = true;
                     }
                 }
             }
         }
         else{
             swiping = false;
             eventSent = false;
         }
     }
 }

I am sorry about the amount of ifs, I did this quite fast...

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ozturkcompany · Dec 23, 2013 at 09:48 AM 1

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Why wont this code work for you and looking for additional answers? Although this code will only work if only one finger is moving on the screen because delta position will get zero if more than one finger moving on the screen

MrVerdoux · Dec 23, 2013 at 01:49 PM 1

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@ozturkcompany are you sure that deltaPosition will be zero? Usually I just use the input from the first touch and it doesn´t become zero.

alone1992 · Jan 04, 2014 at 10:56 AM 0

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@ozturkcompany sağ ol

David_29 · Jan 29, 2014 at 02:41 AM 0

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Does it apply only on the camera as well also?

alone1992 · Jan 29, 2014 at 07:10 PM 0

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I think your question answer is "yes" but I not tested it in other objects yet

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Answer 2

 using UnityEngine;
 using System.Collections;
 
 public class SwipeDetector : MonoBehaviour 
 {
     
     public float minSwipeDistY;
 
     public float minSwipeDistX;
         
     private Vector2 startPos;
 
     void Update()
     {
 //#if UNITY_ANDROID
         if (Input.touchCount > 0) 
             
         {
             
             Touch touch = Input.touches[0];
             
             
             
             switch (touch.phase) 
                 
             {
                 
             case TouchPhase.Began:
 
                 startPos = touch.position;
                 
                 break;
                 
                 
                 
             case TouchPhase.Ended:
 
                     float swipeDistVertical = (new Vector3(0, touch.position.y, 0) - new Vector3(0, startPos.y, 0)).magnitude;
 
                     if (swipeDistVertical > minSwipeDistY) 
                         
                     {
                         
                         float swipeValue = Mathf.Sign(touch.position.y - startPos.y);
                         
                         if (swipeValue > 0)//up swipe
 
                             //Jump ();
                         
                         else if (swipeValue < 0)//down swipe
 
                             //Shrink ();
                         
                     }
                     
                     float swipeDistHorizontal = (new Vector3(touch.position.x,0, 0) - new Vector3(startPos.x, 0, 0)).magnitude;
                     
                     if (swipeDistHorizontal > minSwipeDistX) 
                         
                     {
                         
                         float swipeValue = Mathf.Sign(touch.position.x - startPos.x);
                         
                         if (swipeValue > 0)//right swipe
                             
                             //MoveRight ();
                         
                         else if (swipeValue < 0)//left swipe
                             
                             //MoveLeft ();
                         
                     }
                 break;
             }
         }
     }
 }

Answer 3

Answer by pfonseca · Aug 13, 2014 at 01:07 AM

This works to me: http://pfonseca.com/swipe-detection-on-unity/

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ScriptLab · Jun 20, 2016 at 12:59 PM 0

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works amazing

jdonline · Oct 11, 2018 at 03:22 PM 2

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This link appears to be malware, I would avoid clicking on it

JustNothink · Apr 26, 2020 at 07:58 PM 0

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Seems like the domain is sold, the site displays weird Chinese fap games. I had just stopped being so paranoid about the links I click but now I'm back on it.

Answer 4

Answer by tvranjith · Feb 10, 2015 at 12:57 PM

I found this post http://rtvstudios.blogspot.com/2015/02/detecting-swipe-from-unity3d-c-scripts.html

It detects swipe in four direction and we can also control the swipe speed and angle for the swipe in four direction.

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Answer 5

Answer by Max_power1965 · May 10, 2017 at 12:29 PM

Hu guys, I wrote this simple tutorial wich is basically 7 lines of code and works like a charm. Easy and simple. You just have to use te build in Unity event system instead to write long and useless code. No need to use update or fixed update.

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Losteone · Apr 08, 2018 at 08:15 PM 0

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Hello. Can you reload script here

Because its not working for downloading (((

detect Swipe in four directions (android)

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