.-.-.-.-.-

function TouchTrack() {

var trackableElement;
    var startX = 0, startY = 0;
    var currentX = 0, currentY = 0;
    var touchingElement = false;
    var callbackStart, callbackMove, callbackEnd;
    var startTime;
    var doPreventDefault = false;
    var translateX;
    var translateY;
    var timeTaken;

var init = function(element, start, move, end) {

trackableElement = element;
        
        callbackStart = start;
        callbackMove = move;
        callbackEnd = end;

startTime = new Date().getTime();

addEventListeners();

};
    
    var destroy = function() {
        removeEventListeners();
    };

var addEventListeners = function () {

trackableElement.addEventListener("touchstart", onTouchStart, false);
        trackableElement.addEventListener("touchmove", onTouchMove, false);
        trackableElement.addEventListener("touchend", onTouchEnd, false);
    };
    
    var removeEventListeners = function () {

trackableElement.removeEventListener("touchstart", onTouchStart);
        trackableElement.removeEventListener("touchmove", onTouchMove);
        trackableElement.removeEventListener("touchend", onTouchEnd);
    };

var onTouchStart = function (evt) {
        startTime = new Date().getTime();
        startX = evt.changedTouches[0].pageX;
        currentX = startX;
        
        startY = evt.changedTouches[0].pageY ;
        currentY = startY;

touchingElement = true;

//requestAnimationFrame(update);

callbackStart(startX, startY);

};

var onTouchMove = function (evt) {
       
       if (!touchingElement)
          return;

currentX = evt.changedTouches[0].pageX;
      currentY = evt.changedTouches[0].pageY;
      translateX = currentX - startX;
      translateY = currentY - startY; 
    
      callbackMove(evt, currentX, currentY, translateX, translateY);

};

var onTouchEnd = function (evt) {
   
   if (!touchingElement)
      return;

touchingElement = false;
      translateX = currentX - startX;
      translateY = currentY - startY;

timeTaken = (new Date().getTime() - startTime);
  
      callbackEnd(currentX, currentY, translateX, translateY, timeTaken);

};

return {

init : function(element, start, move, end) {
            init(element, start, move, end);        
        },
        setPreventDefault : function(toPreventDefault) {
            doPreventDefault = toPreventDefault;
        },
        destroy : function() {
            destroy();
        }
    };
}

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