translate(deltaX, deltaY) {
    const geometries = this.geometries_;
    for (let i = 0, ii = geometries.length; i < ii; ++i) {
      geometries[i].translate(deltaX, deltaY);
    }
    this.changed();
  }
Translate the geometry.  This modifies the geometry coordinates in place.  If
instead you want a new geometry, first `clone()` this geometry.
@param {number} deltaX Delta X.
@param {number} deltaY Delta Y.
@api
@override