docs: function getPointByClient(clientX, clientY) {
      var el = this.get('el');
      var pixelRatio = this.get('pixelRatio') || 1;
      var bbox = el.getBoundingClientRect();
      return {
        x: (clientX - bbox.left) * pixelRatio,
        y: (clientY - bbox.top) * pixelRatio
      };
    }