gb.map
自从 3.4
该组件允许在多个图层上显示来自不同来源的地图图块。
它基于两个主要类，
Map 和
MapView，分别绘制复合地图并与其显示/交互。
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类
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说明
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Geo
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This class provide some tools to convert LatLon point into pixel position and the opposite.
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Map
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This class acts like the drawing engine for the map.
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MapBounds
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This class represent an area Bounds and provide tools to deal with them. The points are defined in Lat/Lon WGS84 projection.
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MapPoint
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This class define a Latitude/Longitude points and provide tools to deal with them.
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MapView
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This is an example to get you started.
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Proj
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