*GTileLayer [interface]
http://www.google.com/apis/maps/documentation/
**Version 2 (2006.4) &font(Red){新規};
>You implement this interface in order to provide custom map tile layers. Your implementation of this interface should use an instance of GTileLayer as a prototype, because this implements the copyright handling for you.
***Constructor
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|Constructor|Description|h
|GTileLayer(copyrights, minResolution, maxResolution)|Constructor arguments can be omitted if instantiated as a prototype. A Subclass constructor must invoke this constructor using call().|
***Methods
>These methods are called by the map and the map type to which this tile layer is passed. You will need to implement the methods marked abstract when you implement a custom tile layer.
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|Methods|Return Value|Description|h
|minResolution()|Number|Returns to the map type the lowest zoom level of this tile layer.|
|maxResolution()|Number|Returns to the map type the highest zoom level of this tile layer.|
|getTileUrl(tile, zoom)|String|Abstract. Returns to the map the URL of the map tile with the tile indices given by the x and y properties of the GPoint, at the given zoom level.|
|isPng()|Boolean|Abstract. Returns to the map whether the tiles are in PNG image format and hence can be transparent. Otherwise GIF is assumed.|
|getOpacity()|Number|Abstract. Returns to the map the opacity with which to display this tile layer. 1.0 is opaque, 0.0 is transparent.|
***Events
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|Events|Arguments|Description|h
|newcopyright|copyright|This event is fired when a new copyright is added to the copyright collection of this tile layer.|