Method gestureend

script.js:1040–1043

(e)

      callback(scale, rotation);
    };
    let gestureend = function(e) {
      this.gesturing = false;
      e.preventDefault();
    };
    elem.addEventListener('gesturestart', gesturestart.bind(this));
    elem.addEventListener('gesturechange', gesturechange.bind(this));
    elem.addEventListener('gestureend', gestureend.bind(this));