function createFingerData(id, evt) {
      var f = {
        start: {
          x: 0,
          y: 0
        },
        last: {
          x: 0,
          y: 0
        },
        end: {
          x: 0,
          y: 0
        }
      };
      f.start.x = f.last.x = f.end.x = evt.pageX || evt.clientX;
      f.start.y = f.last.y = f.end.y = evt.pageY || evt.clientY;
      fingerData[id] = f;
      return f;
    }
Creates the finger data for the touch/finger in the event object.
@param {int} id The id to store the finger data under (usually the order the fingers were pressed)
@param {object} evt The event object containing finger data
@return finger data object
@inner