code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you under the Apache License, Version 2.0 (the
  // "License"); you may not use this file except in compliance
  // with the License.  You may obtain a copy of the License at
  //
  //   http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing,
  // software distributed under the License is distributed on an
  // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  // KIND, either express or implied.  See the License for the
  // specific language governing permissions and limitations
  // under the License.
  
  package org.openqa.selenium.interactions;
  
  import org.openqa.selenium.Point;
  
  /**
   * Provides coordinates of an element for advanced interactions. Note that some coordinates (such as
   * screen coordinates) are evaluated lazily since the element may have to be scrolled into view.
   */
  public interface Coordinates {
  
    /**
     * Gets coordinates on the element relative to the top-left corner of the monitor (screen). This
     * method automatically scrolls the page and/or frames to make element visible in viewport before
     * calculating its coordinates.
     *
     * @return coordinates on the element relative to the top-left corner of the monitor (screen).
     * @throws org.openqa.selenium.ElementNotInteractableException if the element can't be scrolled
     *     into view.
     */
    Point onScreen();
  
    /**
     * Gets coordinates on the element relative to the top-left corner of OS-window being used to
     * display the content. Usually it is the browser window's viewport. This method automatically
     * scrolls the page and/or frames to make element visible in viewport before calculating its
     * coordinates.
     *
     * @return coordinates on the element relative to the top-left corner of the browser window's
     *     viewport.
     * @throws org.openqa.selenium.ElementNotInteractableException if the element can't be scrolled
     *     into view.
     */
    Point inViewPort();
  
    /**
     * Gets coordinates on the element relative to the top-left corner of the page.
     *
     * @return coordinates on the element relative to the top-left corner of the page.
     */
    Point onPage();
  
    Object getAuxiliary();
  }
  