指定距离该建筑绘制坐标的X坐标。默认值为0。红警2中无用，因为大多数建筑的动态动画和建筑一样大。
Specifies the X coordinate from the building draw position. Defaults to 0. Not used in RA2, as most building's active animations are the same size as the building.
此函数将以输入点为基础，按照用户指定的距离创建一个新缓冲区轮廓数据层。
This function will create a new buffer feature data layer around the input point features at user specified distance.
后续的调用会将迭代器前后移动指定的距离。
Subsequent invocations move the iterator backward or forward by the required distance.
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