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/**
* @name MarkerManager v3
* @version 1.2
* @copyright (c) 2007 Google Inc.
* @author Doug Ricket, Bjorn Brala (port to v3), others,
*
* @fileoverview Marker manager is an interface between the map and the user,
* designed to manage adding and removing many points when the viewport changes.
* <br /><br />
* <b>How it Works</b>:<br/>
* The MarkerManager places its markers onto a grid, similar to the map tiles.
* When the user moves the viewport, it computes which grid cells have
* entered or left the viewport, and shows or hides all the markers in those
* cells.
* (If the users scrolls the viewport beyond the markers that are loaded,
* no markers will be visible until the <code>EVENT_moveend</code>
* triggers an update.)
* In practical consequences, this allows 10,000 markers to be distributed over
* a large area, and as long as only 100-200 are visible in any given viewport,
* the user will see good performance corresponding to the 100 visible markers,
* rather than poor performance corresponding to the total 10,000 markers.
* Note that some code is optimized for speed over space,
* with the goal of accommodating thousands of markers.
*/
/**
* Licensed 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.
*/
Library Location: http://google-maps-utility-library-v3.googlecode.com/svn/tags/markermanager/