How to make swipe function?

Questions & Answers
1

i am trying to do swipe functionality for android phone and the code is working but i am facing a problem when i am swiping and removing my finger then it is doing action or else with out removing my finger on device the action can not be done what i want to do can any one help me with this here is my code

if(Input.touches.Length > 0)

     {

         Touch t = Input.GetTouch(0);

         if(t.phase == TouchPhase.Began)

         {

              //save began touch 2d point

             firstPressPos = new Vector2(t.position.x,t.position.y);

         }

         if(t.phase == TouchPhase.Ended)

         {

              //save ended touch 2d point

             secondPressPos = new Vector2(t.position.x,t.position.y);

                            

              //create vector from the two points

             currentSwipe = new Vector3(secondPressPos.x - firstPressPos.x, secondPressPos.y - firstPressPos.y);

                

             //normalize the 2d vector

             currentSwipe.Normalize();

 

             //swipe upwards

             if(currentSwipe.y > 0 && currentSwipe.x > -0.8f && currentSwipe.x < 0.8f)

             {

                  lastJumpButtonTime = Time.time;

             }

 

         }

     }
2

You need to track the swipe on the TouchPhase.Moved to acheive what you want. Here your code rewritten:

//Constant use in code. Use these to tweak the result
float MinSwipeDistance = 35f;
float SwipeAllowedVariance = 0.8f;
bool trackSwipe = false;

if(Input.touches.Length > 0)
{
	Touch t = Input.GetTouch(0);

	if(t.phase == TouchPhase.Began)
	{
		//save began touch 2d point
		firstPressPos = new Vector2(t.position.x,t.position.y);
		trackSwipe = true;
	}

	if(t.phase == TouchPhase.Moved)
	{
		//save ended touch 2d point
		secondPressPos = new Vector2(t.position.x,t.position.y);

		//create vector from the two points
		currentSwipe = secondPressPos - firstPressPos;

		//swipe upwards
		//If the swipe is long enough and in the right direction.
		if( (currentSwipe.magnitude > MinSwipeDistance) && (currentSwipe.y > 0) && (Math.Abs(currentSwipe.x) < SwipeAllowedVariance))
		{
			lastJumpButtonTime = Time.time;
			//We've reconized the swipe. Stop tracking it.
			trackSwipe = false;
		}
	}

	if(t.phase == TouchPhace.Ended)
	{
		trackSwipe = false;
	}
}

For vector math, you don’t have to substact each Vector element to create a delta vector, you can do it by subtracting a vector by another.

If you need more explanation, please comment.