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楼主 |
发表于 2011-7-30 23:00:41
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这个是官方解释:
The first argument is a direction, the second argument is the reversed direction. The reverse direction of north is south, etc. | | The third argument is a spatial coordinate. In general, each cardinal direction should have a unique value which is a power of two (e.g. 1, 2, 4, 8, 16, 32, 64, etc). The exception is for compound directions, whose value should be the sum of the values for each component direction. For example, if the third value for 'n' is 1, and 'e' is 2, then you would want 'ne' to have a value of 3 (1 + 2). This value is required for the #map functionality to work. |
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