Finger Gesture Script

Hi guys,

I'm wondering how you'd go about creating a method to recognize advanced finger gestures?

I have a script that recognizes when you're swiping up, down, left and right. Like so:

I'm wondering how you go about making code for recognizing drawing a circle or a square with your finger. Even an arching swipe as opposed to a simple right and left swipe.

Any ideas on the actual method behind it?

 

Forgot to add code lol..

Code (CSharp):

1.         // Mobile touch interface
2.         int fingerCount = 0;
3.        
4.         foreach (Touch touch in Input.touches)
5.         {
6.             if(touch.phase == TouchPhase.Began)
7.             {
8.                 initTouchPos = touch.position;
9.             }
10.            
11.             if (touch.phase != TouchPhase.Ended && touch.phase != TouchPhase.Canceled)
12.             {
13.                 fingerCount++;
14.                
15.                 if(fingerCount == 1 && touch.phase == TouchPhase.Began)
16.                 {
17.                     Ray ray = Camera.main.ScreenPointToRay(Input.GetTouch(0).position);
18.                     RaycastHit hit;
19.                    
20.                     if (Physics.Raycast(ray, out hit))
21.                     {
22.                         if(hit.transform.tag == "ButtonPush" || hit.transform.tag == "ButtonPadAbove" || hit.transform.tag == "ButtonPadBelow" || hit.transform.tag == "ButtonShield" || hit.transform.tag == "ButtonRocket")
23.                         {
24.                             hit.collider.GetComponent<ButtonScript>().AttemptPress();
25.                         }
26.                     }
27.                 }
28.  
29.                 if(fingerCount == 2 && touch.phase == TouchPhase.Began)
30.                 {
31.                     oneTouch = Input.GetTouch(0).position;
32.                     twoTouch = Input.GetTouch(1).position;
33.  
34.                     fingerDistance = Vector2.Distance(oneTouch, twoTouch);
35.                 }
36.                 if(fingerCount == 2 && touch.phase != TouchPhase.Began)
37.                 {
38.                     float newfingerDist = Vector2.Distance(Input.GetTouch(0).position, Input.GetTouch(1).position);
39.  
40.                     if(fingerDistance != newfingerDist)
41.                     {
42.                         Camera.main.transform.localPosition += new Vector3(0,0, (newfingerDist - fingerDistance) );
43.                     }
44.                 }
45.                    
46.                 if(fingerCount == 1 && touch.phase == TouchPhase.Moved || touch.phase == TouchPhase.Ended)
47.                 {
48.                     if(initTouchPos.y < touch.position.y)
49.                     {
50.                         move.MoveIt(transform.up);
51.                     }
52.                     if(initTouchPos.y > touch.position.y)
53.                     {
54.                         move.MoveIt(-transform.up);
55.                     }
56.                 }
57.                
58.                 /*if(fingerCount == 1 && touch.phase == TouchPhase.Moved || touch.phase == TouchPhase.Ended)
59.                 {
60.                     Vector2 touchFacing = (initTouchPos - touch.position).normalized;
61.                    
62.                     if(Vector2.Dot(touchFacing, Vector2.up) > 0.8 && Vector2.Distance(initTouchPos, touch.position) > 20)
63.                     {
64.                         Ability("SwipeDown");
65.                     }
66.                     if(Vector2.Dot(touchFacing, -Vector2.up) > 0.8 && Vector2.Distance(initTouchPos, touch.position) > 20)
67.                     {
68.                         Ability("SwipeUp");
69.                     }
70.                     if(Vector2.Dot(touchFacing, Vector2.right) > 0.8 && Vector2.Distance(initTouchPos, touch.position) > 20)
71.                     {
72.                         Ability("SwipeLeft");
73.                     }
74.                     if(Vector2.Dot(touchFacing, -Vector2.right) > 0.8 && Vector2.Distance(initTouchPos, touch.position) > 20)
75.                     {
76.                         Ability("SwipeRight");
77.                     }
78.                 }*/
79.             }
80.         }
81.     }

 

Not really sure of a nice way to do it, I've never really tried it out but what I'd do is store an array of the gesture points, so in your case 4, creating the square, then check the distance between the touch input and array number in sequence

you could always take a look at this for a proper implementation: http://depts.washington.edu/aimgroup/proj/dollar/pdollar.html


Or purchase this: https://www.assetstore.unity3d.com/en/#!/content/1044
- which is unity implementation of the above link